Document:

Forms of Notice of Grant of Stock Option

 Exhibit 10.7 
 GCT SEMICONDUCTOR, INC. 
 FORM OF NOTICE OF GRANT OF STOCK OPTION
– US OPTIONEE 
 Notice is hereby given of the following option grant (the “Option”) to
purchase shares of the Common Stock of GCT Semiconductor, Inc. (the “Corporation”): 
  

			
	Optionee:	  	
		
	Grant Date:	  	
		
	Vesting Commencement Date:	  	

			
	
	Exercise Price:    $            per
share

			
		
	Number of Option Shares:	  	shares of Common Stock
		
	Expiration Date:	  	

					
			
	Type of Option:	  	         
	  	Incentive Stock Option
			
		  	         
	  	Non-Statutory Stock Option
	
	Date Exercisable:    Immediately Exercisable

 Vesting Schedule: The Option Shares shall initially be unvested and subject to
repurchase by the Corporation at the lower of (i) the Exercise Price paid per share or (ii) the Fair Market Value per share at the time of Optionee’s cessation of Service. Optionee shall acquire a vested interest in, and the
Corporation’s repurchase right shall accordingly lapse with respect to, (i) twenty-five percent (25%) of the Option Shares upon Optionee’s completion of one (1) year of Service measured from the Vesting Commencement Date and
(ii) the balance of the Option Shares in a series of thirty-six (36) successive equal monthly installments upon Optionee’s completion of each additional month of Service over the thirty-six (36)-month period measured from the first
anniversary of the Vesting Commencement Date. The Option shall not become exercisable for any additional Option Shares following Optionee’s cessation of Service, except to the extent (if any) specifically authorized by the Plan Administrator in
its sole discretion pursuant to an express written agreement with Optionee. 
 Optionee understands and agrees
that the Option is granted subject to and in accordance with the terms of the GCT Semiconductor, Inc. 2010 Stock Option/Stock Issuance Plan (the “Plan”). Optionee further agrees to be bound by the terms of the Plan, the terms of the Option
as set forth in the Stock Option Agreement attached hereto as Exhibit A and the Code Section 409A Waiver and Release attached hereto as Exhibit B. Optionee understands that any Option Shares purchased under the Option will be subject to the
terms set forth in the Stock 

 
Purchase Agreement attached hereto as Exhibit C. Optionee hereby acknowledges receipt of a copy of the Plan in the form attached hereto as Exhibit D. 

REPURCHASE RIGHTS. OPTIONEE HEREBY AGREES THAT ALL OPTION SHARES ACQUIRED UPON THE EXERCISE OF THE OPTION SHALL
BE SUBJECT TO CERTAIN REPURCHASE RIGHTS AND RIGHTS OF FIRST REFUSAL EXERCISABLE BY THE CORPORATION AND ITS ASSIGNS. THE TERMS OF SUCH RIGHTS ARE SPECIFIED IN THE ATTACHED STOCK PURCHASE AGREEMENT. 

At Will Employment. Nothing in this Notice or in the attached Stock Option Agreement or Plan shall confer upon
Optionee any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Corporation (or any Parent or Subsidiary employing or retaining Optionee) or of Optionee, which rights
are hereby expressly reserved by each, to terminate Optionee’s Service at any time for any reason, with or without cause. 
 Definitions. All capitalized terms in this Notice shall have the meaning assigned to them in this Notice or in the attached Stock Option Agreement. 

DATED:                     ,
             
  

			
	 GCT SEMICONDUCTOR, INC.

		
	 By:
	 	  

		
	 Title:
	 	  

		
		 	  

		 	, OPTIONEE                
		
	 Address:
	 	  

		
		 	  

 Attachments: 

Exhibit A - Stock Option Agreement 
 Exhibit B - Code Section 409A Waiver and Release 

Exhibit C - Stock Purchase Agreement 
 Exhibit D - 2010 Stock Option/Stock Issuance Plan 

 GCT SEMICONDUCTOR, INC.  

FORM OF STOCK OPTION AGREEMENT – US OPTIONEE 
 RECITALS 
 A. The Board has adopted the Plan for the
purpose of retaining the services of selected Employees, non-employee members of the Board or the board of directors of any Parent or Subsidiary and consultants and other independent advisors in the service of the Corporation (or any Parent or
Subsidiary). 
 B. Optionee is to render valuable services to the Corporation (or a Parent or Subsidiary), and
this Agreement is executed pursuant to, and is intended to carry out the purposes of, the Plan in connection with the Corporation’s grant of an option to Optionee. 

C. All capitalized terms in this Agreement shall have the meaning assigned to them in the attached Appendix. 

NOW, THEREFORE, it is hereby agreed as follows: 

1. Grant of Option. The Corporation hereby grants to Optionee, as of the Grant Date, an option to purchase
up to the number of Option Shares specified in the Grant Notice. The Option Shares shall be purchasable from time to time during the option term specified in Paragraph 2 at the Exercise Price. 

2. Option Term. This option shall have a term of ten (10) years measured from the Grant Date and shall
accordingly expire at the close of business on the Expiration Date, unless sooner terminated in accordance with Paragraph 5 or 6. 
 3. Limited Transferability. 
 (a) This option,
together with the Option Shares during the period prior to exercise, shall be neither transferable nor assignable by Optionee other than by will or the laws of inheritance following Optionee’s death and may be exercised, during Optionee’s
lifetime, only by Optionee. However, Optionee may designate one or more Family Members as the beneficiary or beneficiaries of this option, and this option shall, in accordance with such designation, automatically be transferred to such beneficiary
or beneficiaries upon Optionee’s death while holding this option. Such beneficiary or beneficiaries shall take the transferred option subject to all the terms and conditions of this Agreement, including (without limitation) the limited time
period during which this option may, pursuant to Paragraph 5, be exercised following Optionee’s death. 

(b) If this option is designated a Non-Statutory Option in the Grant Notice, then this option, together with the
unexercised Option Shares, shall be subject to the same transfer restrictions as set forth in Paragraph 3(a), except that such option, together with the underlying unexercised Option Shares, may be assigned in whole or in part during the

 
Optionee’s lifetime by gift or pursuant to a domestic relations order to one or more of Optionee’s Family Members or to a trust established for the exclusive benefit of Optionee and/or
one or more such Family Members. The assigned portion shall be exercisable only by the person or persons who acquire a proprietary interest in the option pursuant to such assignment. The terms applicable to the assigned portion shall be the same as
those in effect for this option immediately prior to such assignment. 
 (c) Prior to the date the Corporation
first becomes subject to the reporting requirements of Section 13 or 15(d) of the 1934 Act, this option, together with the underlying unexercised Option Shares, shall not be the subject of any short position, put equivalent position (as such
term is defined in Rule 16a-1(h) under the 1934 Act) or call equivalent position (as such term is defined Rule 16a-1(b) of the 1934 Act). 
 (d) Except as otherwise provided in Paragraph 3(a) or 3(b), until the date the Corporation first becomes subject to the reporting requirements of Section 13 or 15(d) of the 1934 Act, this option,
together with the underlying unexercised Option Shares, shall not be the subject of any pledges, gifts, hypothecations or other transfers, other than pursuant to the Corporation’s repurchase rights or in connection with a Change in Control in
which this option, together with all other options outstanding under the Plan at such time, shall terminate and cease to be outstanding. 
 4. Dates of Exercise. This option shall become exercisable for the Option Shares in one or more installments as specified in the Grant Notice. As the option becomes exercisable for such
installments, those installments shall accumulate, and the option shall remain exercisable for the accumulated installments until the Expiration Date or sooner termination of the option term under Paragraph 5 or 6. 

5. Cessation of Service. The option term specified in Paragraph 2 shall terminate (and this option shall
cease to be outstanding) prior to the Expiration Date should any of the following provisions become applicable: 
 (a) Should Optionee cease to remain in Service for any reason (other than death, Disability or Misconduct) while this option is outstanding, then Optionee (or any person or persons to whom this option is
transferred pursuant to a permitted transfer under Paragraph 3) shall have a period of three (3) months (commencing with the date of such cessation of Service) during which to exercise this option, but in no event shall this option be
exercisable at any time after the Expiration Date. 
 (b) Should Optionee die while this option is outstanding,
then the personal representative of Optionee’s estate or the person or persons to whom the option is transferred pursuant to Optionee’s will or the laws of inheritance following Optionee’s death or, if applicable, the person to whom
the option is transferred during Optionee’s lifetime pursuant to a permitted transfer under Paragraph 3 shall have the right to exercise this option. However, if Optionee dies while holding this option and has an effective beneficiary
designation in effect for this option at the time of his or her death, then the designated beneficiary or beneficiaries shall have the exclusive right to exercise this option following Optionee’s death. Any such right to

 
exercise this option shall lapse, and this option shall cease to be outstanding, upon the earlier of (i) the expiration of the twelve (12)-month period measured from the date of
Optionee’s death or (ii) the Expiration Date. 
 (c) Should Optionee cease Service by reason of
Disability while this option is outstanding, then Optionee (or any person or persons to whom this option is transferred pursuant to a permitted transfer under Paragraph 3) shall have a period of twelve (12) months (commencing with the date of
such cessation of Service) during which to exercise this option. In no event shall this option be exercisable at any time after the Expiration Date. 

Note: Exercise of this option on a date later than three (3) months following cessation
of Service due to Disability will result in loss of favorable Incentive Option treatment, unless such Disability constitutes Permanent Disability. In the event that Incentive Option treatment is not available, this option will be taxed as a
Non-Statutory Option upon exercise. 
 (d) During the limited period of post-Service exercisability, this
option may not be exercised in the aggregate for more than the number of Option Shares in which Optionee is, at the time of Optionee’s cessation of Service, vested pursuant to the Vesting Schedule specified in the Grant Notice or the special
vesting acceleration provisions of Paragraph 6. No additional Option Shares shall vest, whether pursuant to the normal Vesting Schedule specified in the Grant Notice or the special vesting acceleration provisions of Paragraph 6, following
Optionee’s cessation of Service, except to the extent (if any) specifically authorized by the Plan Administrator pursuant to an express written agreement with Optionee. Upon the expiration of such limited exercise period or (if earlier) upon
the Expiration Date, this option shall terminate and cease to be outstanding for any vested Option Shares for which the option has not been exercised. 
 (e) Should Optionee’s Service be terminated for Misconduct or should Optionee otherwise engage in Misconduct while this option is outstanding, then this option shall terminate immediately and cease
to remain outstanding. 
 6. Change in Control. 

(a) Should a Change in Control occur during the Optionee’s period of Service, then the Option Shares at the time
subject to this option but not otherwise vested shall automatically vest in full so that this option shall, immediately prior to the effective date of the Change in Control, become exercisable for all of the Option Shares as fully vested shares and
may be exercised for any or all of those Option Shares as vested shares. However, the Option Shares shall not vest on such an accelerated basis if and to the extent: (i) this option is assumed by the successor corporation (or parent thereof) or
otherwise continued in full force and effect pursuant to the terms of the Change in Control transaction and the Corporation’s repurchase rights with respect to the unvested Option Shares purchasable under this option are assigned to such
successor corporation (or parent thereof) or otherwise continued in effect or (ii) this option is to be replaced with a cash retention program of the successor corporation which preserves the

 
spread existing on the unvested Option Shares at the time of the Change in Control (the excess of the Fair Market Value of those Option Shares over the Exercise Price payable for such shares) and
provides for subsequent payout of that spread in accordance with the same Vesting Schedule applicable to those unvested Option Shares as set forth in the Grant Notice or (iii) such accelerated vesting is otherwise precluded pursuant to the
provisions of Paragraph 5(d) above. 
 (b) Immediately following the Change in Control, this option shall
terminate and cease to be outstanding, except to the extent assumed by the successor corporation (or parent thereof) or otherwise continued in full force and effect pursuant to the terms of the Change in Control transaction. 

(c) If this option is assumed in connection with a Change in Control or otherwise continued in effect, then this option
shall be appropriately adjusted, immediately after such Change in Control, to apply to the number and class of securities which would have been issuable to Optionee in consummation of such Change in Control had the option been exercised immediately
prior to such Change in Control, and appropriate adjustments shall also be made to the Exercise Price, provided the aggregate Exercise Price shall remain the same. To the extent that the actual holders of the Corporation’s outstanding
Common Stock receive cash consideration for their Common Stock in consummation of the Change in Control, the successor corporation may, in connection with the assumption or continuation of this option, substitute one or more shares of its own common
stock with a fair market value equivalent to the cash consideration paid per share of Common Stock in such Change in Control. 
 (d) This Agreement shall not in any way affect the right of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure or to merge, consolidate, dissolve,
liquidate or sell or transfer all or any part of its business or assets. 
 7. Adjustment in Option
Shares. In the event of any of the following transactions affecting the outstanding Common Stock as a class without the Corporation’s receipt of consideration: any stock split, stock dividend, spin-off transaction, extraordinary
distribution (whether in cash, securities or other property), recapitalization, combination of shares, exchange of shares or other similar transaction affecting the Common Stock without the Corporation’s receipt of consideration or in the event
of a substantial reduction to the value of the outstanding shares of Common Stock as a result of a spin-off transaction or extraordinary distribution, then equitable adjustments shall be made to (i) the total number and/or class of securities
subject to this option and (ii) the Exercise Price. The adjustments shall be made by the Plan Administrator in such manner as the Plan Administrator deems appropriate in order to reflect such change, and those adjustments shall be final,
binding and conclusive. 
 8. Stockholder Rights. The holder of this option shall not have
any stockholder rights with respect to the Option Shares until such person shall have exercised the option, paid the Exercise Price and become the record holder of the purchased shares. 

 9. Manner of Exercising Option. 

(a) In order to exercise this option with respect to all or any part of the Option Shares for which this option is at the
time exercisable, Optionee (or any other person or persons exercising the option) must take the following actions: 
 (i) Execute and deliver to the Corporation a Purchase Agreement for the Option Shares for which the option is exercised. 

(ii) Pay the aggregate Exercise Price for the purchased shares in one or more of the following forms:

 (A) cash or check made payable to the Corporation; or 

(B) a promissory note payable to the Corporation, but only to the extent authorized by the Plan
Administrator in accordance with Paragraph 14. 
 Should the Common Stock be registered under Section 12 of
the 1934 Act at the time the option is exercised, then the Exercise Price may also be paid as follows: 
 (C) in shares of Common Stock valued at Fair Market Value on the Exercise Date and held by Optionee (or any other person or persons exercising the option) for the period (if any) necessary to avoid a
charge to the Corporation’s earnings for financial reporting purposes; or 
 (D) to the
extent the option is exercised for vested Option Shares, through a special sale and remittance procedure pursuant to which Optionee (or any other person or persons exercising the option) shall concurrently provide irrevocable instructions
(a) to a brokerage firm (reasonably satisfactory to the Corporation for purposes of administering such procedure in compliance with any applicable pre-clearance or pre-notification requirements) to effect the immediate sale of the purchased
shares and remit to the Corporation, out of the sale proceeds available on the settlement date, sufficient funds to cover the aggregate Exercise Price payable for the purchased shares plus all applicable income and employment taxes required to be
withheld by the Corporation by reason of such exercise and (b) to the Corporation to deliver the certificates for the purchased shares directly to such brokerage firm on such settlement date in order to complete the sale. 

Except to the extent the sale and remittance procedure is utilized in connection with the option exercise, payment of the
Exercise Price must accompany the Purchase Agreement delivered to the Corporation in connection with the option exercise. 

 (iii) Furnish to the Corporation appropriate documentation
that the person or persons exercising the option (if other than Optionee) have the right to exercise this option. 
 (iv) Execute and deliver to the Corporation such written representations as may be requested by the Corporation in order for it to comply with the applicable requirements of applicable securities laws.

 (v) Make appropriate arrangements with the Corporation (or Parent or Subsidiary employing or
retaining Optionee) for the satisfaction of all applicable income and employment tax withholding requirements applicable to the option exercise. 
 (b) As soon as practical after the Exercise Date, the Corporation shall issue to or on behalf of Optionee (or any other person or persons exercising this option) a certificate for the purchased Option
Shares, with the appropriate legends affixed thereto. 
 (c) In no event may this option be exercised for any
fractional shares. 
 10. REPURCHASE RIGHTS. ALL OPTION SHARES ACQUIRED UPON THE
EXERCISE OF THIS OPTION SHALL BE SUBJECT TO CERTAIN RIGHTS OF THE CORPORATION AND ITS ASSIGNS TO REPURCHASE THOSE SHARES IN ACCORDANCE WITH THE TERMS SPECIFIED IN THE PURCHASE AGREEMENT. 

11. Compliance with Laws and Regulations. 

(a) The exercise of this option and the issuance of the Option Shares upon such exercise shall be subject to compliance
by the Corporation and Optionee with all applicable requirements of law relating thereto and with all applicable regulations of any stock exchange on which the Common Stock may be listed for trading at the time of such exercise and issuance.

 (b) The inability of the Corporation to obtain approval from any regulatory body having authority deemed by
the Corporation to be necessary to the lawful issuance and sale of any Common Stock pursuant to this option shall relieve the Corporation of any liability with respect to the non-issuance or sale of the Common Stock as to which such approval shall
not have been obtained. The Corporation, however, shall use its best efforts to obtain all such approvals. 

12. Successors and Assigns. Except to the extent otherwise provided in Paragraphs 3 and 6, the provisions
of this Agreement shall inure to the benefit of, and be binding upon, the Corporation and its successors and assigns and Optionee, Optionee’s assigns and the legal representatives, heirs and legatees of Optionee’s estate. 

 13. Notices. Any notice required to be given or delivered to
the Corporation under the terms of this Agreement shall be in writing and addressed to the Corporation at its principal corporate offices. Any notice required to be given or delivered to Optionee shall be in writing and addressed to Optionee at the
address indicated below Optionee’s signature line on the Grant Notice. All notices shall be deemed effective upon personal delivery or upon deposit in the U.S. mail, postage prepaid and properly addressed to the party to be notified.

 14. Financing. The Plan Administrator may, in its absolute discretion and without any
obligation to do so, permit Optionee to pay the Exercise Price for the purchased Option Shares by delivering a full-recourse promissory note bearing interest at a market rate and secured by those Option Shares. The payment schedule in effect for any
such promissory note shall be established by the Plan Administrator in its sole discretion. 
 15.
Construction. This Agreement and the option evidenced hereby are made and granted pursuant to the Plan and are in all respects limited by and subject to the terms of the Plan. All decisions of the Plan Administrator with respect to any
question or issue arising under the Plan or this Agreement shall be conclusive and binding on all persons having an interest in this option. 
 16. Governing Law. The interpretation, performance and enforcement of this Agreement shall be governed by the laws of the State of California without resort to that State’s
conflict-of-laws rules. 
 17. Stockholder Approval. If the Option Shares covered by this
Agreement exceed, as of the Grant Date, the number of shares of Common Stock which may be issued under the Plan as last approved by the stockholders, then this option shall be void with respect to such excess shares, unless stockholder approval of
an amendment sufficiently increasing the number of shares of Common Stock issuable under the Plan is obtained in accordance with the provisions of the Plan. 
 18. Additional Terms Applicable to an Incentive Option. In the event this option is designated an Incentive Option in the Grant Notice, the following terms and conditions shall also apply to
the grant: 
 (a) This option shall cease to qualify for favorable tax treatment as an Incentive Option if (and
to the extent) this option is exercised for one or more Option Shares: (i) more than three (3) months after the date Optionee ceases to be an Employee for any reason other than death or Permanent Disability or (ii) more than twelve
(12) months after the date Optionee ceases to be an Employee by reason of Permanent Disability. 
 (b)
This option shall not become exercisable in the calendar year in which granted if (and to the extent) the aggregate Fair Market Value (determined at the Grant Date) of the Common Stock for which this option would otherwise first become exercisable
in such calendar year would, when added to the aggregate value (determined as of the respective date or dates of grant) of the Common Stock and any other securities for which one or more other Incentive Options granted to Optionee prior to the Grant
Date (whether under the Plan or 

 
any other option plan of the Corporation or any Parent or Subsidiary) first become exercisable during the same calendar year, exceed One Hundred Thousand Dollars ($100,000) in the aggregate. To
the extent the exercisability of this option is deferred by reason of the foregoing limitation, the deferred portion shall become exercisable in the first calendar year or years thereafter in which the One Hundred Thousand Dollar ($100,000)
limitation of this Paragraph 18(b) would not be contravened, but such deferral shall in all events end immediately prior to the effective date of a Change in Control in which this option is not to be assumed or otherwise continued in effect,
whereupon the option shall become immediately exercisable as a Non-Statutory Option for the deferred portion of the Option Shares. 
 (c) Should Optionee hold, in addition to this option, one or more other options to purchase Common Stock which become exercisable for the first time in the same calendar year as this option, then for
purposes of the foregoing limitations on the exercisability of such options as Incentive Options, this option and each of those other options shall be deemed to become first exercisable in that calendar year on the basis of the chronological order
in which they were granted, except to the extent otherwise provided under applicable law or regulation. 

 APPENDIX 

The following definitions shall be in effect under the Agreement: 

A. Agreement shall mean this Stock Option Agreement. 

B. Board shall mean the Corporation’s Board of Directors. 

C. Change in Control shall mean a change in ownership or control of the Corporation effected through any of
the following transactions: 
 (i) a merger, consolidation or other reorganization approved by
the Corporation’s stockholders, unless securities representing more than fifty percent (50%) of the total combined voting power of the voting securities of the successor corporation are immediately thereafter beneficially owned,
directly or indirectly and in substantially the same proportion, by the persons who beneficially owned the Corporation’s outstanding voting securities immediately prior to such transaction, or 

(ii) a stockholder-approved sale, transfer or other disposition of all or substantially all of the
Corporation’s assets in liquidation or dissolution of the Corporation, or 
 (iii) the
acquisition, directly or indirectly by any person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation), of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly
to the Corporation’s stockholders. 
 In no event shall any public offering of the Corporation’s
securities be deemed to constitute a Change in Control. 
 D. Code shall mean the Internal Revenue
Code of 1986, as amended. 
 E. Common Stock shall mean the Corporation’s common stock.

 F. Corporation shall mean GCT Semiconductor, Inc., a Delaware corporation, and any successor
corporation to all or substantially all of the assets or voting stock of GCT Semiconductor, Inc. which shall by appropriate action assume this option. 
 G. Disability shall mean the inability of Optionee to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment and shall be determined
by the Plan Administrator on the basis of such medical evidence as the Plan Administrator deems warranted under the circumstances. Disability shall be 

 
deemed to constitute Permanent Disability in the event that such Disability is expected to result in death or has lasted or can be expected to last for a continuous period of twelve
(12) months or more. 
 H. Employee shall mean an individual who is in the employ of the
Corporation (or any Parent or Subsidiary), subject to the control and direction of the employer entity as to both the work to be performed and the manner and method of performance. 

I. Exercise Date shall mean the date on which the option shall have been exercised in accordance with
Paragraph 9 of the Agreement. 
 J. Exercise Price shall mean the exercise price payable per
Option Share as specified in the Grant Notice. 
 K. Expiration Date shall mean the date on which
the option expires as specified in the Grant Notice. 
 L. Fair Market Value per share of Common
Stock on any relevant date shall be determined in accordance with the following provisions: 

(i) If the Common Stock is at the time traded on the Nasdaq Global or Global Select Market, then the Fair
Market Value shall be the closing selling price per share of Common Stock on the date in question, as the price is reported by the National Association of Securities Dealers for that particular Stock Exchange and published in The Wall Street
Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation exists. 

(ii) If the Common Stock is at the time listed on any other Stock Exchange, then the Fair Market Value
shall be the closing selling price per share of Common Stock on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock, as such price is officially quoted in the composite tape
of transactions on such exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding
date for which such quotation exists. 
 (iii) If the Common Stock is not at the time listed on
any Stock Exchange, then the Fair Market Value shall be determined by the Plan Administrator through the reasonable application of a reasonable valuation method that takes into account the applicable valuation factors set forth in the Treasury
Regulations issued under Section 409A of the Code; provided, however, that if the option is designated Incentive Option in the Grant Notice, then such 

 
Fair Market Value shall be determined in accordance with the standards of Section 422 and the applicable Treasury Regulations thereunder. 

M. Family Member shall mean any of the following members of the Optionee’s family: any child,
stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law. 

N. Grant Date shall mean the date of grant of the option as specified in the Grant Notice. 

O. Grant Notice shall mean the Notice of Grant of Stock Option accompanying the Agreement, pursuant to
which Optionee has been informed of the basic terms of the option evidenced hereby. 
 P. Incentive
Option shall mean an option which satisfies the requirements of Code Section 422. 
 Q.
Misconduct shall mean the commission of any act of fraud, embezzlement or dishonesty by Optionee, any unauthorized use or disclosure by Optionee of confidential information or trade secrets of the Corporation (or any Parent or
Subsidiary), or any other intentional misconduct by Optionee adversely affecting the business or affairs of the Corporation (or any Parent or Subsidiary) in a material manner. The foregoing definition shall not in any way preclude or restrict the
right of the Corporation (or any Parent or Subsidiary) to discharge or dismiss Optionee or any other person in the Service of the Corporation (or any Parent or Subsidiary) for any other acts or omissions, but such other acts or omissions shall not
be deemed, for purposes of the Plan or this Agreement, to constitute grounds for termination for Misconduct. 

R. 1934 Act shall mean the Securities Exchange Act of 1934, as amended. 

S. Non-Statutory Option shall mean an option not intended to satisfy the requirements of Code
Section 422. 
 T. Option Shares shall mean the number of shares of Common Stock subject to
the option. 
 U. Optionee shall mean the person to whom the option is granted as specified in the
Grant Notice. 
 V. Parent shall mean any corporation (other than the Corporation) in an unbroken
chain of corporations ending with the Corporation, provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting
power of all classes of stock in one of the other corporations in such chain. 

 W. Plan shall mean the Corporation’s 2010 Stock
Option/Stock Issuance Plan. 
 X. Plan Administrator shall mean either the Board or a committee of
the Board acting in its capacity as administrator of the Plan. 
 Y. Purchase Agreement shall mean
the stock purchase agreement in substantially the form of Exhibit C to the Grant Notice. 
 Z.
Service shall mean Optionee’s performance of services for the Corporation (or any Parent or Subsidiary, whether now existing or subsequently established) in the capacity of an Employee, a non-employee member of the board of
directors or a consultant or independent advisor. For purposes of this Agreement, Optionee shall be deemed to cease Service immediately upon the occurrence of the either of the following events: (i) Optionee no longer performs services in any
of the foregoing capacities for the Corporation or any Parent or Subsidiary or (ii) the entity for which Optionee is performing such services ceases to remain a Parent or Subsidiary of the Corporation, even though Optionee may subsequently
continue to perform services for that entity. Service shall not be deemed to cease during a period of military leave, sick leave or other personal leave approved by the Corporation; provided, however, that should such leave of absence exceed
three (3) months, then for purposes of determining the period within which the Option (if designated as an Incentive Option in the Grant Notice) may be exercised as such an Incentive Option under the federal tax laws, Optionee’s Service
shall be deemed to cease on the first day immediately following the expiration of such three (3)-month period, unless Optionee is provided with the right to return to Service following such leave either by statute or by written contract. Except to
the extent otherwise required by law or expressly authorized by the Plan Administrator or by the Corporation’s written policy on leaves of absence, no Service credit shall be given for vesting purposes for any period Optionee is on a leave of
absence. 
 AA. Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global or Global
Select Market or the New York Stock Exchange. 
 BB. Subsidiary shall mean any corporation (other
than the Corporation) in an unbroken chain of corporations beginning with the Corporation, provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent
(50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 
 CC. Vesting Schedule shall mean the vesting schedule specified in the Grant Notice pursuant to which the Optionee is to vest in the Option Shares in a series of installments over his or her
period of Service. 

 GCT SEMICONDUCTOR, INC.  

FORM OF STOCK PURCHASE AGREEMENT – US OPTIONEE 

AGREEMENT made this         day of
            , 20        by and between GCT Semiconductor, Inc., a Delaware corporation, and
                    , Optionee under the Corporation’s 2010 Stock Option/Stock Issuance Plan. 

All capitalized terms in this Agreement shall have the meaning assigned to them in this Agreement or in the attached
Appendix. 
  

	 	A.	 EXERCISE OF OPTION 

 1. Exercise. Optionee hereby purchases             shares of Common Stock (the “Purchased Shares”) pursuant to that
certain option (the “Option”) granted Optionee on             ,             (the “Grant Date”) to purchase up
to             shares of Common Stock (the “Option Shares”) under the Plan at the exercise price of $            per
share (the “Exercise Price”). 
 2. Payment. Concurrently with the delivery of this
Agreement to the Corporation, Optionee shall pay the Exercise Price for the Purchased Shares in accordance with the provisions of the Option Agreement and shall deliver whatever additional documents may be required by the Option Agreement as a
condition for exercise, together with a duly-executed blank Assignment Separate from Certificate (in the form attached hereto as Exhibit I) with respect to the Purchased Shares. 

3. Stockholder Rights. Until such time as the Corporation exercises the Repurchase Right or the First
Refusal Right, Optionee (or any successor in interest) shall have all the rights of a stockholder (including voting, dividend and liquidation rights) with respect to the Purchased Shares, subject, however, to the transfer restrictions of Articles B
and C. 
  

	 	B.	 SECURITIES LAW COMPLIANCE 

 4. Restricted Securities. The Purchased Shares have not been registered under the 1933 Act and are being issued to Optionee in reliance upon the exemption from such registration provided by
SEC Rule 701 for stock issuances under compensatory benefit plans such as the Plan. Optionee hereby confirms that Optionee has been informed that the Purchased Shares are restricted securities under the 1933 Act and may not be resold or transferred
unless the Purchased Shares are first registered under the Federal securities laws or unless an exemption from such registration is available. Accordingly, Optionee hereby acknowledges that Optionee is acquiring the Purchased Shares for investment
purposes only and not with a view to resale and is prepared to hold the Purchased Shares for an indefinite period and that Optionee is aware that SEC Rule 144 issued under the 1933 Act which exempts certain resales of unrestricted securities is not
presently available to exempt the resale of the Purchased Shares from the registration requirements of the 1933 Act. 

 5. Restrictions on Disposition of Purchased Shares. Optionee
shall make no disposition of the Purchased Shares (other than a Permitted Transfer) unless and until there is compliance with all of the following requirements: 

(i) Optionee shall have provided the Corporation with a written summary of the terms and conditions of the
proposed disposition. 
 (ii) Optionee shall have complied with all requirements of this
Agreement applicable to the disposition of the Purchased Shares. 
 (iii) Optionee shall have
provided the Corporation with written assurances, in form and substance satisfactory to the Corporation, that (a) the proposed disposition does not require registration of the Purchased Shares under the 1933 Act or (b) all appropriate
action necessary for compliance with the registration requirements of the 1933 Act or any exemption from registration available under the 1933 Act (including Rule 144) has been taken. 

The Corporation shall not be required (i) to transfer on its books any Purchased Shares which have been sold
or transferred in violation of the provisions of this Agreement or (ii) to treat as the owner of the Purchased Shares, or otherwise to accord voting, dividend or liquidation rights to, any transferee to whom the Purchased Shares have been
transferred in contravention of this Agreement. 
 6. Restrictive Legends. The stock certificates
for the Purchased Shares shall be endorsed with one or more of the following restrictive legends: 
 “The shares represented by this certificate have not been registered under the Securities Act of 1933. The shares may not be sold or offered for sale in the absence of (a) an effective
registration statement for the shares under such Act, (b) a ‘no action’ letter of the Securities and Exchange Commission with respect to such sale or offer or (c) satisfactory assurances to the Corporation that registration under
such Act is not required with respect to such sale or offer.” 
 “The shares
represented by this certificate are subject to certain repurchase rights and rights of first refusal granted to the Corporation and accordingly may not be sold, assigned, transferred, encumbered, or in any manner disposed of except in conformity
with the terms of a written agreement dated             , 20        between the Corporation and the registered holder of the shares (or the
predecessor in interest to the shares). A copy of such agreement is maintained at the Corporation’s principal corporate offices.” 
  

	 	C.	 TRANSFER RESTRICTIONS 

 7. Restriction on Transfer. Except for any Permitted Transfer, Optionee shall not transfer, assign, encumber or otherwise dispose of any of the Purchased Shares which are subject to the
Repurchase Right. In addition, Purchased Shares which are released from the 

 
Repurchase Right shall not be transferred, assigned, encumbered or otherwise disposed of in contravention of the First Refusal Right or the Market Stand-Off. 

8. Transferee Obligations. Each person (other than the Corporation) to whom the Purchased Shares are
transferred by means of a Permitted Transfer must, as a condition precedent to the validity of such transfer, acknowledge in writing to the Corporation that such person is bound by the provisions of this Agreement and that the transferred shares are
subject to (i) the Repurchase Right, (ii) the First Refusal Right and (iii) the Market Stand-Off, to the same extent such shares would be so subject if retained by Optionee. 

9. Market Stand-Off. 

(a) In connection with any underwritten public offering by the Corporation of its equity securities pursuant to an
effective registration statement filed under the 1933 Act, including the Corporation’s initial public offering, Owner shall not sell, make any short sale of, loan, hypothecate, pledge, grant any option for the purchase of, or otherwise dispose
or transfer for value or otherwise agree to engage in any of the foregoing transactions with respect to, any Purchased Shares without the prior written consent of the Corporation or its underwriters. Such restriction (the “Market
Stand-Off”) shall be in effect for such period of time from and after the effective date of the final prospectus for the offering as may be requested by the Corporation or such underwriters. In no event, however, shall such period exceed one
hundred eighty (180) days, and the Market Stand-Off shall in no event be applicable to any underwritten public offering effected more than two (2) years after the effective date of the Corporation’s initial public offering.

 (b) Owner shall be subject to the Market Stand-Off provided and only if the officers and directors of the
Corporation are also subject to similar restrictions. 
 (c) Any new, substituted or additional securities
which are by reason of any Recapitalization or Reorganization distributed with respect to the Purchased Shares shall be immediately subject to the Market Stand-Off, to the same extent the Purchased Shares are at such time covered by such provisions.

 (d) In order to enforce the Market Stand-Off, the Corporation may impose stop-transfer instructions with
respect to the Purchased Shares until the end of the applicable stand-off period. 
  

	 	D.	 REPURCHASE RIGHT 

 10. Grant. The Corporation is hereby granted the right (the “Repurchase Right”), exercisable at any time during the sixty (60)-day period following the date Optionee ceases for any
reason to remain in Service or (if later) during the sixty (60)-day period following the execution date of this Agreement, to repurchase at the Repurchase Price any or all of the Purchased Shares in which Optionee is not, at the time of his or her
cessation of Service, vested in accordance with the Vesting Schedule applicable to those shares or the special vesting 

 
acceleration provisions of Paragraph D.6 of this Agreement (such shares to be hereinafter referred to as the “Unvested Shares”). 

11. Exercise of the Repurchase Right. The Repurchase Right shall be exercisable by written notice delivered
to each Owner of the Unvested Shares prior to the expiration of the sixty (60)-day exercise period. The notice shall indicate the number of Unvested Shares to be repurchased, the Repurchase Price to be paid per share and the date on which the
repurchase is to be effected, such date to be not more than thirty (30) days after the date of such notice. The certificates representing the Unvested Shares to be repurchased shall be delivered to the Corporation on the closing date specified
for the repurchase. Concurrently with the receipt of such stock certificates, the Corporation shall pay to Owner, in cash or cash equivalents (including the cancellation of any purchase-money indebtedness), an amount equal to the Repurchase Price
for the Unvested Shares which are to be repurchased from Owner. 
 12. Termination of the Repurchase
Right. The Repurchase Right shall terminate with respect to any Unvested Shares for which it is not timely exercised under Paragraph D.2. In addition, the Repurchase Right shall terminate and cease to be exercisable with respect to any and
all Purchased Shares in which Optionee vests in accordance with the Vesting Schedule. All Purchased Shares as to which the Repurchase Right lapses shall, however, remain subject to (i) the First Refusal Right and (ii) the Market Stand-Off.

 13. Aggregate Vesting Limitation. If the Option is exercised in more than one increment so that
Optionee is a party to one or more other Stock Purchase Agreements (the “Prior Purchase Agreements”) which are executed prior to the date of this Agreement, then the total number of Purchased Shares as to which Optionee shall be deemed to
have a fully-vested interest under this Agreement and all Prior Purchase Agreements shall not exceed in the aggregate the number of Purchased Shares in which Optionee would otherwise at the time be vested, in accordance with the Vesting Schedule,
had all the Purchased Shares (including those acquired under the Prior Purchase Agreements) been acquired exclusively under this Agreement. 
 14. Recapitalization. Any new, substituted or additional securities or other property (including cash paid other than as a regular cash dividend) which is by reason of any Recapitalization
distributed with respect to the Purchased Shares shall be immediately subject to the Repurchase Right and any escrow requirements hereunder, but only to the extent the Purchased Shares are at the time covered by such right or escrow requirements.
Appropriate adjustments to reflect such distribution shall be made to the number and/or class of Purchased 

 
Shares subject to this Agreement and to the Repurchase Price per share to be paid upon the exercise of the Repurchase Right in order to reflect the effect of any such Recapitalization upon the
Corporation’s capital structure; provided, however, that the aggregate Repurchase Price shall remain the same. 
 15. Change in Control. 
 (a) The Repurchase Right
shall automatically terminate in its entirety, and all the Purchased Shares shall vest in full, immediately prior to the consummation of any Change in Control, except to the extent the Repurchase Right is to be assigned to the successor entity in
such Change in Control or otherwise continued in full force and effect pursuant to the terms of the Change in Control transaction. 
 (b) To the extent the Repurchase Right remains in effect following a Change in Control, such right shall apply to any new securities or other property (including any cash payments) received in exchange
for the Purchased Shares in consummation of the Change in Control, but only to the extent the Purchased Shares are at the time covered by such right. Appropriate adjustments shall be made to the Repurchase Price per share payable upon exercise of
the Repurchase Right to reflect the effect (if any) of the Change in Control upon the Corporation’s capital structure; provided, however, that the aggregate Repurchase Price shall remain the same. The new securities or other property
(including any cash payments) issued or distributed with respect to the Purchased Shares in consummation of the Change in Control shall be immediately deposited in escrow with the Corporation (or the successor entity) and shall not be released from
escrow until Optionee vests in such securities or other property in accordance with the same Vesting Schedule in effect for the Purchased Shares. 
  

	 	E.	 RIGHT OF FIRST REFUSAL 

 16. Grant. The Corporation is hereby granted the right of first refusal (the “First Refusal Right”), exercisable in connection with any proposed transfer of the Purchased Shares in
which Optionee has vested in accordance with the provisions of Article D. For purposes of this Article E, the term “transfer” shall include any sale, assignment, pledge, encumbrance or other disposition of the Purchased Shares intended to
be made by Owner, but shall not include any Permitted Transfer. 
 17. Notice of Intended
Disposition. In the event any Owner of Purchased Shares in which Optionee has vested desires to accept a bona fide third-party offer for the transfer of any or all of such shares (the Purchased Shares subject to such offer to be hereinafter
referred to as the “Target Shares”), Owner shall promptly (i) deliver to the Corporation written notice (the “Disposition Notice”) of the terms of the offer, including the purchase price and the identity of the third-party
offeror, and (ii) provide satisfactory proof that the disposition of the Target Shares to such third-party offeror would not be in contravention of the provisions set forth in Articles B and C. 

18. Exercise of the First Refusal Right. The Corporation shall, for a period of twenty-five (25) days
following receipt of the Disposition Notice, have the right to repurchase 

 
any or all of the Target Shares subject to the Disposition Notice upon the same terms as those specified therein or upon such other terms (not materially different from those specified in the
Disposition Notice) to which Owner consents. Such right shall be exercisable by delivery of written notice (the “Exercise Notice”) to Owner prior to the expiration of the twenty-five (25)-day exercise period. If such right is exercised
with respect to all the Target Shares, then the Corporation shall effect the repurchase of such shares, including payment of the purchase price, not more than five (5) business days after delivery of the Exercise Notice; and at such time the
certificates representing the Target Shares shall be delivered to the Corporation. 
 Should the purchase price
specified in the Disposition Notice be payable in property other than cash or evidences of indebtedness, the Corporation shall have the right to pay the purchase price in the form of cash equal in amount to the value of such property. If Owner and
the Corporation cannot agree on such cash value within ten (10) days after the Corporation’s receipt of the Disposition Notice, the valuation shall be made by an appraiser of recognized standing selected by Owner and the Corporation or, if
they cannot agree on an appraiser within twenty (20) days after the Corporation’s receipt of the Disposition Notice, each shall select an appraiser of recognized standing and the two (2) appraisers shall designate a third appraiser of
recognized standing, whose appraisal shall be determinative of such value. The cost of such appraisal shall be shared equally by Owner and the Corporation. The closing shall then be held on the later of (i) the fifth (5th) business
day following delivery of the Exercise Notice or (ii) the fifth (5th) business day after such valuation shall have been made. 
 19. Non-Exercise of the First Refusal Right. In the event the Exercise Notice is not given to Owner prior to the expiration of the twenty-five (25)-day exercise period, Owner shall have a
period of thirty (30) days thereafter in which to sell or otherwise dispose of the Target Shares to the third-party offeror identified in the Disposition Notice upon terms (including the purchase price) no more favorable to such third-party
offeror than those specified in the Disposition Notice; provided, however, that any such sale or disposition must not be effected in contravention of the provisions of Articles B and C. The third-party offeror shall acquire the Target Shares
subject to the First Refusal Right and the provisions and restrictions of Article B and Paragraph C.3, and any subsequent disposition of the acquired shares must be effected in compliance with the terms and conditions of such First Refusal Right and
the provisions and restrictions of Article B and Paragraph C.3. In the event Owner does not effect such sale or disposition of the Target Shares within the specified thirty (30)-day period, the First Refusal Right shall continue to be applicable to
any subsequent disposition of the Target Shares by Owner until such right lapses. 
 20. Partial Exercise
of the First Refusal Right. In the event the Corporation makes a timely exercise of the First Refusal Right with respect to a portion, but not all, of the Target Shares specified in the Disposition Notice, Owner shall have the option,
exercisable by written notice to the Corporation delivered within five (5) business days after Owner’s receipt of the Exercise Notice, to effect the sale of the Target Shares pursuant to either of the following alternatives: 

 (i) sale or other disposition of all the Target Shares to
the third-party offeror identified in the Disposition Notice, but in full compliance with the requirements of Paragraph E.4, as if the Corporation did not exercise the First Refusal Right; or 

(ii) sale to the Corporation of the portion of the Target Shares which the Corporation has elected to
purchase, such sale to be effected in substantial conformity with the provisions of Paragraph E.3. The First Refusal Right shall continue to be applicable to any subsequent disposition of the remaining Target Shares until such right lapses.

 Owner’s failure to deliver timely notification to the Corporation shall be deemed to be an election by
Owner to sell the Target Shares pursuant to alternative (i) above. 
 21.
Recapitalization/Reorganization. 
 (a) Any new, substituted or additional securities or other
property which is by reason of any Recapitalization distributed with respect to the Purchased Shares shall be immediately subject to the First Refusal Right, but only to the extent the Purchased Shares are at the time covered by such right.

 (b) In the event of a Reorganization, the First Refusal Right shall remain in full force and effect and
shall apply to the new capital stock or other property received in exchange for the Purchased Shares in consummation of the Reorganization, but only to the extent the Purchased Shares are at the time covered by such right. 

22. Lapse. The First Refusal Right shall lapse upon the earliest to occur of (i) the first date on
which shares of the Common Stock are held of record by more than five hundred (500) persons, (ii) a determination made by the Board that a public market exists for the outstanding shares of Common Stock or (iii) a firm commitment
underwritten public offering, pursuant to an effective registration statement under the 1933 Act, covering the offer and sale of the Common Stock in the aggregate amount of at least twenty million dollars ($20,000,000). However, the Market Stand-Off
shall continue to remain in full force and effect following the lapse of the First Refusal Right. 
  

	 	F.	 SPECIAL TAX ELECTION 

 The acquisition of the Purchased Shares may result in adverse tax consequences which may be avoided or mitigated by filing an election under Code Section 83(b). Such election must be filed within
thirty (30) days after the date of this Agreement. A description of the tax consequences applicable to the acquisition of the Purchased Shares and the form for making the Code Section 83(b) election are set forth in Exhibit II. OPTIONEE
SHOULD CONSULT WITH HIS OR HER TAX ADVISOR TO DETERMINE THE TAX CONSEQUENCES OF ACQUIRING THE PURCHASED SHARES AND THE ADVANTAGES AND DISADVANTAGES OF FILING THE CODE SECTION 83(b) ELECTION. OPTIONEE ACKNOWLEDGES THAT IT IS OPTIONEE’S SOLE

 
RESPONSIBILITY, AND NOT THE CORPORATION’S, TO FILE A TIMELY ELECTION UNDER CODE SECTION 83(b), EVEN IF OPTIONEE REQUESTS THE CORPORATION OR ITS REPRESENTATIVES TO MAKE THIS FILING ON HIS
OR HER BEHALF. 
  

	 	G.	 GENERAL PROVISIONS 

 23. Assignment. The Corporation may assign the Repurchase Right and/or the First Refusal Right to any person or entity selected by the Board, including (without limitation) one or
more stockholders of the Corporation. 
 24. At Will Employment. Nothing in this Agreement or in
the Plan shall confer upon Optionee any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Corporation (or any Parent or Subsidiary employing or retaining Optionee)
or of Optionee, which rights are hereby expressly reserved by each, to terminate Optionee’s Service at any time for any reason, with or without cause. 
 25. Notices. Any notice required to be given under this Agreement shall be in writing and shall be deemed effective upon personal delivery or upon deposit in the U.S. mail, registered or
certified, postage prepaid and properly addressed to the party entitled to such notice at the address indicated below such party’s signature line on this Agreement or at such other address as such party may designate by ten (10) days
advance written notice under this paragraph to all other parties to this Agreement. 
 26. No
Waiver. The failure of the Corporation in any instance to exercise the Repurchase Right or the First Refusal Right shall not constitute a waiver of any other repurchase rights and/or rights of first refusal that may subsequently arise under
the provisions of this Agreement or any other agreement between the Corporation and Optionee. No waiver of any breach or condition of this Agreement shall be deemed to be a waiver of any other or subsequent breach or condition, whether of like or
different nature. 
 27. Cancellation of Shares. If the Corporation shall make available, at the
time and place and in the amount and form provided in this Agreement, the consideration for the Purchased Shares to be repurchased in accordance with the provisions of this Agreement, then from and after such time, the person from whom such shares
are to be repurchased shall no longer have any rights as a holder of such shares (other than the right to receive payment of such consideration in accordance with this Agreement). Such shares shall be deemed purchased in accordance with the
applicable provisions hereof, and the Corporation shall be deemed the owner and holder of such shares, whether or not the certificates therefor have been delivered as required by this Agreement. 

 

	 	H.	 MISCELLANEOUS PROVISIONS 

 28. Optionee Undertaking. Optionee hereby agrees to take whatever additional action and execute whatever additional documents the Corporation may deem

 
necessary or advisable in order to carry out or effect one or more of the obligations or restrictions imposed on either Optionee or the Purchased Shares pursuant to the provisions of this
Agreement. 
 29. Agreement is Entire Contract. This Agreement constitutes the entire contract
between the parties hereto with regard to the subject matter hereof. This Agreement is made pursuant to the provisions of the Plan and shall in all respects be construed in conformity with the terms of the Plan. 

30. Governing Law. This Agreement shall be governed by, and construed in accordance with, the laws of the
State of California without resort to that State’s conflict-of-laws rules. 
 31.
Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed to be an original, but all of which together shall constitute one and the same instrument. 

32. Successors and Assigns. The provisions of this Agreement shall inure to the benefit of, and be binding
upon, the Corporation and its successors and assigns and upon Optionee, Optionee’s permitted assigns and the legal representatives, heirs and legatees of Optionee’s estate, whether or not any such person shall have become a party to this
Agreement and have agreed in writing to join herein and be bound by the terms hereof. 
 IN WITNESS
WHEREOF, the parties have executed this Agreement on the day and year first indicated above. 
  

			
	 GCT SEMICONDUCTOR, INC.

		
	 By:
	 	  

		
	 Title:
	 	  

		
	 Address:
	 	  

		
		 	  

		
		 	  

		 	, OPTIONEE            
		
	 Address:
	 	  

		
		 	  

 SPOUSAL ACKNOWLEDGMENT 

The undersigned spouse of Optionee has read and hereby approves the foregoing Stock Purchase Agreement. In consideration
of the Corporation’s granting Optionee the right to acquire the Purchased Shares in accordance with the terms of such Agreement, the undersigned hereby agrees to be irrevocably bound by all the terms of such Agreement, including (without
limitation) the right of the Corporation (or its assigns) to purchase any Purchased Shares in which Optionee is not vested at time of his or her cessation of Service. 

 

			
		 	  

		 	 OPTIONEE’S SPOUSE

		
	 Address:
	 	  

		
		 	  

 EXHIBIT I 
 ASSIGNMENT SEPARATE FROM CERTIFICATE 
 FOR VALUE
RECEIVED                    hereby sell(s), assign(s) and transfer(s) unto GCT Semiconductor, Inc. (the
“Corporation”),                    (            ) shares of the Common Stock of
the Corporation standing in his or her name on the books of the Corporation represented by Certificate No.                     herewith and do(es)
hereby irrevocably constitute and appoint                     Attorney to transfer the said stock on the books of the Corporation with full power of
substitution in the premises. 
 Dated:
                     

Signature  ___________________________________ 
 Instruction: Please do not fill in any blanks other than the signature line. Please sign exactly as you would like your name to appear on the issued stock certificate. The purpose of this
assignment is to enable the Corporation to exercise the Repurchase Right without requiring additional signatures on the part of Optionee. 

 EXHIBIT II 
 FEDERAL INCOME TAX CONSEQUENCES AND 
 SECTION 83(B) TAX ELECTION

 I. Federal Income Tax Consequences and Section 83(b) Election For Exercise of Non-Statutory Option. If
the Purchased Shares are acquired pursuant to the exercise of a Non-Statutory Option, as specified in the Grant Notice, then under Code Section 83, the excess of the Fair Market Value of the Purchased Shares on the date any forfeiture
restrictions applicable to such shares lapse over the Exercise Price paid for those shares will be reportable as ordinary income on the lapse date. For this purpose, the term “forfeiture restrictions” includes the right of the Corporation
to repurchase the Purchased Shares pursuant to the Repurchase Right. However, Optionee may elect under Code Section 83(b) to be taxed at the time the Purchased Shares are acquired, rather than when and as such Purchased Shares cease to be
subject to such forfeiture restrictions. Such election must be filed with the Internal Revenue Service within thirty (30) days after the date of the Agreement. Even if the Fair Market Value of the Purchased Shares on the date of the Agreement
equals the Exercise Price paid (and thus no tax is payable), the election must be made to avoid adverse tax consequences in the future. The form for making this election is attached as part of this exhibit. FAILURE TO MAKE THIS FILING WITHIN THE
APPLICABLE THIRTY (30)-DAY PERIOD WILL RESULT IN THE RECOGNITION OF ORDINARY INCOME BY OPTIONEE AS THE FORFEITURE RESTRICTIONS LAPSE. 
 II. Federal Income Tax Consequences and Conditional Section 83(b) Election For Exercise of Incentive Option. If the Purchased Shares are acquired pursuant to the exercise of an
Incentive Option, as specified in the Grant Notice, then the following tax principles shall be applicable to the Purchased Shares: 
 (i) For regular tax purposes, no taxable income will be recognized at the time the Option is exercised. 
 (ii) The excess of (a) the Fair Market Value of the Purchased Shares on the date the Option is exercised or (if later) on the date any forfeiture restrictions applicable to the Purchased Shares lapse
over (b) the Exercise Price paid for the Purchased Shares will be includible in Optionee’s taxable income for alternative minimum tax purposes. 
 (iii) If Optionee makes a disqualifying disposition of the Purchased Shares, then Optionee will recognize ordinary income in the year of such disposition equal in amount to the excess of (a) the Fair
Market Value of the Purchased Shares on the date the Option is exercised or (if later) on the date any forfeiture restrictions applicable to the Purchased Shares lapse over (b) the Exercise Price paid for the Purchased Shares. Any additional
gain recognized upon the disqualifying disposition will be either short-term or long-term capital gain depending upon the period for which the Purchased Shares are held prior to the disposition. 

 (iv) For purposes of the foregoing, the term
“forfeiture restrictions” will include the right of the Corporation to repurchase the Purchased Shares pursuant to the Repurchase Right. The term “disqualifying disposition” means any sale or other disposition1 of the Purchased Shares within two (2) years after the Grant
Date or within one (1) year after the exercise date of the Option. 
 (v) The Code Section 83(b)
election will be effective in limiting the Optionee’s alternative minimum taxable income to the excess of the Fair Market Value of the Purchased Shares at the time the Option is exercised over the Exercise Price paid for those shares.

 Page 2 of the attached form for making the election should be filed with any election made in connection with the exercise of
an Incentive Option. 
  
  

	1 	 Generally, a disposition of shares purchased under an Incentive Option includes any transfer of legal title, including a transfer by sale, exchange or
gift, but does not include a transfer to the Optionee’s spouse, a transfer into joint ownership with right of survivorship if Optionee remains one of the joint owners, a pledge, a transfer by bequest or inheritance or certain tax-free exchanges
permitted under the Code. 

 SECTION 83(B) ELECTION 

This statement is being made under Section 83(b) of the Internal Revenue Code, pursuant to Treas. Reg.
Section 1.83-2. 
  

	(1)	 The taxpayer who performed the services is: 

Name: 
 Address: 
 Taxpayer Ident. No.: 

 

	(2)	 The property with respect to which the election is being made is
                     shares of the common stock of GCT Semiconductor, Inc. 

 

	(3)	 The property was issued on             ,
        . 

  

	(4)	 The taxable year in which the election is being made is the calendar year         .

  

	(5)	 The property is subject to a repurchase right pursuant to which the issuer has the right to acquire the property at the lower of the purchase price
paid per share or the fair market value per share, if for any reason taxpayer’s service with the issuer terminates. The issuer’s repurchase right will lapse in a series of annual and monthly installments over a four (4)-year period ending
on             , 20        . 

  

	(6)	 The fair market value at the time of transfer (determined without regard to any restriction other than a restriction which by its terms will never
lapse) is $             per share. 

  

	(7)	 The amount paid for such property is $             per share.

  

	(8)	 A copy of this statement was furnished to GCT Semiconductor, Inc. for whom taxpayer rendered the services underlying the transfer of property.

  

	(9)	 This statement is executed on             ,
        . 

  

					
	  
 Spouse (if
any)
	  		  	  

Taxpayer

 This election must be filed with the Internal Revenue Service Center with which taxpayer files his or
her Federal income tax returns and must be made within thirty (30) days after the execution date of the Stock Purchase Agreement. This filing should be made by registered or certified mail, return receipt requested. Optionee must retain two
(2) copies of the completed form for filing with his or her Federal and state tax returns for the current tax year and an additional copy for his or her records. 

 The property described in the above Section 83(b) election is comprised
of shares of common stock acquired pursuant to the exercise of an incentive stock option under Section 422 of the Internal Revenue Code (the “Code”). Accordingly, the purpose of this election is to have the alternative minimum taxable
income attributable to the purchased shares measured by the amount by which the fair market value of such shares at the time of their transfer to the Taxpayer exceeds the purchase price paid for the shares. In the absence of this election, such
alternative minimum taxable income would be measured by the spread between the fair market value of the purchased shares and the purchase price which exists on the various lapse dates in effect for the forfeiture restrictions applicable to such
shares. 
 THIS PAGE 2 IS TO BE ATTACHED TO ANY SECTION 83(b) ELECTION FILED IN CONNECTION WITH THE EXERCISE OF AN INCENTIVE
STOCK OPTION UNDER THE FEDERAL TAX LAWS. 

 APPENDIX 

The following definitions shall be in effect under the Agreement: 

A. Agreement shall mean this Stock Purchase Agreement. 

B. Board shall mean the Corporation’s Board of Directors. 

C. Change in Control shall mean a change in ownership or control of the Corporation effected through any of
the following transactions: 
 (i) a merger, consolidation or other reorganization approved by
the Corporation’s stockholders, unless securities representing more than fifty percent (50%) of the total combined voting power of the voting securities of the successor corporation are immediately thereafter beneficially owned,
directly or indirectly and in substantially the same proportion, by the persons who beneficially owned the Corporation’s outstanding voting securities immediately prior to such transaction, or 

(ii) a stockholder-approved sale, transfer or other disposition of all or substantially all of the
Corporation’s assets in liquidation or dissolution of the Corporation, or 
 (iii) the
acquisition, directly or indirectly by any person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation), of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly
to the Corporation’s stockholders. 
 In no event shall any public offering of the Corporation’s
securities be deemed to constitute a Change in Control. 
 D. Code shall mean the Internal Revenue
Code of 1986, as amended. 
 E. Common Stock shall mean the Corporation’s common stock.

 F. Corporation shall mean GCT Semiconductor, Inc., a Delaware corporation, and any successor
corporation to all or substantially all of the assets or voting stock of GCT Semiconductor, Inc. which shall by appropriate action adopt the Plan. 
 G. Disposition Notice shall have the meaning assigned to such term in Paragraph E.2. 

 H. Exercise Price shall have the meaning assigned to such term
in Paragraph A.1. 
 I. Fair Market Value per share of Common Stock on any relevant date
shall be determined in accordance with the following provisions: 
 (i) If the Common Stock is at
the time traded on the Nasdaq Global or Global Select Market, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question, as such price is reported by the National Association of Securities
Dealers for that particular Stock Exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last
preceding date for which such quotation exists. 
 (ii) If the Common Stock is at the time listed
on any other Stock Exchange, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock, as
such price is officially quoted in the composite tape of transactions on such exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value
shall be the closing selling price on the last preceding date for which such quotation exists. 

(iii) If the Common Stock is not at the time listed on any Stock Exchange, then the Fair Market Value
shall be determined by the Plan Administrator through the reasonable application of a reasonable valuation method that takes into account the applicable valuation factors set forth in the Treasury Regulations issued under Section 409A of the
Code. 
 J. Family Member shall mean any of the following members of the Optionee’s family:
any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law. 

K. First Refusal Right shall mean the right granted to the Corporation in accordance with Article E.

 L. Grant Date shall have the meaning assigned to such term in Paragraph A.1. 

M. Grant Notice shall mean the Notice of Grant of Stock Option pursuant to which Optionee has been informed
of the basic terms of the Option. 

 N. Incentive Option shall mean an option which satisfies the
requirements of Code Section 422. 
 O. Market Stand-Off shall mean the market stand-off
restriction specified in Paragraph C.3. 
 P. 1933 Act shall mean the Securities Act of 1933, as
amended. 
 Q. 1934 Act shall mean the Securities Exchange Act of 1934, as amended. 

R. Non-Statutory Option shall mean an option not intended to satisfy the requirements of Code
Section 422. 
 S. Option shall have the meaning assigned to such term in Paragraph A.1.

 T. Option Agreement shall mean all agreements and other documents evidencing the Option.

 U. Optionee shall mean the person to whom the Option is granted under the Plan. 

V. Owner shall mean Optionee and all subsequent holders of the Purchased Shares who derive their chain of
ownership through a Permitted Transfer from Optionee. 
 W. Parent shall mean any corporation
(other than the Corporation) in an unbroken chain of corporations ending with the Corporation, provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent
(50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 
 X. Permitted Transfer shall mean (i) a gratuitous transfer of the Purchased Shares to one or more of the Optionee’s Family Members or to a trust established for Optionee or one or
more such Family Members, provided and only if Optionee obtains the Corporation’s prior written consent to such transfer, (ii) a transfer of title to the Purchased Shares effected pursuant to Optionee’s will or the laws of inheritance
following Optionee’s death or (iii) a transfer to the Corporation in pledge as security for any purchase-money indebtedness incurred by Optionee in connection with the acquisition of the Purchased Shares. 

Y. Plan shall mean the Corporation’s 2010 Stock Option/Stock Issuance Plan. 

Z. Plan Administrator shall mean either the Board or a committee of the Board acting in its capacity as
administrator of the Plan. 
 AA. Prior Purchase Agreement shall have the meaning assigned to such
term in Paragraph D.4. 

 BB. Purchased Shares shall have the meaning assigned to such
term in Paragraph A.1. 
 CC. Recapitalization shall mean any of the following transactions
affecting the Corporation’s outstanding Common Stock as a class without the Corporation’s receipt of consideration: any stock split, stock dividend, spin-off transaction, extraordinary distribution (whether in cash, securities or other
property), recapitalization, combination of shares, exchange of shares or other similar transaction affecting the Common Stock without the Corporation’s receipt of consideration. 

DD. Reorganization shall mean any of the following transactions: 

(i) a merger or consolidation in which the Corporation is not the surviving entity, 

(ii) a sale, transfer or other disposition of all or substantially all of the Corporation’s assets,

 (iii) a reverse merger in which the Corporation is the surviving entity but in which the
Corporation’s outstanding voting securities are transferred in whole or in part to a person or persons different from the persons holding those securities immediately prior to the merger, or 

(iv) any transaction effected primarily to change the state in which the Corporation is incorporated or to
create a holding company structure. 
 EE. Repurchase Price shall mean the lower of
(i) the Exercise Price or (ii) the Fair Market Value per share of Common Stock on the date of Optionee’s cessation of Service. 
 FF. Repurchase Right shall mean the right granted to the Corporation in accordance with Article D. 
 GG. SEC shall mean the Securities and Exchange Commission. 
 HH. Service shall mean Optionee’s performance of services for the Corporation (or any Parent or Subsidiary, whether now existing or subsequently established) in the capacity of an
Employee, a non-employee member of the board of directors or a consultant or independent advisor. For purposes of this Agreement, Optionee shall be deemed to cease Service immediately upon the occurrence of the either of the following events:
(i) Optionee no longer performs services in any of the foregoing capacities for the Corporation or any Parent or Subsidiary or (ii) the entity for which Optionee is performing such services ceases to remain a Parent or Subsidiary of the
Corporation, even though Optionee may subsequently continue to perform services for that entity. Service shall not be deemed to cease during a period of military leave, sick leave or other personal leave approved by the Corporation. However, except
to the extent otherwise required by law or expressly authorized by the Plan Administrator or by the 

 
Corporation’s written policy on leaves of absence, no Service credit shall be given for vesting purposes for any period Optionee is on a leave of absence. 

II. Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global or Global Select Market or the
New York Stock Exchange. 
 JJ. Subsidiary shall mean any corporation (other than the Corporation)
in an unbroken chain of corporations beginning with the Corporation, provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent (50%) or more of the
total combined voting power of all classes of stock in one of the other corporations in such chain. 
 KK.
Target Shares shall have the meaning assigned to such term in Paragraph E.2. 
 LL.
Unvested Shares shall have the meaning assigned to such term in Paragraph D.1. 
 MM.
Vesting Schedule shall mean the vesting schedule specified in the Grant Notice pursuant to which Optionee is to vest in the Option Shares in a series of installments over his or her period of Service. 

 GCT SEMICONDUCTOR, INC. 

FORM OF NOTICE OF GRANT OF STOCK OPTION – KOREA OPTIONEE 

Notice is hereby given of the following option grant (the “Option”) to purchase shares of the Common Stock of
GCT Semiconductor, Inc. (the “Corporation”): 
  

	
	 Optionee:

	
	 Grant Date:

	
	 Vesting Commencement Date:

	
	 Exercise Price: $            per share

	
	 Number of Option Shares:              shares of Common Stock

  

					
	 Expiration Date:

 
 Type of Option:
	  	         
	  	 Incentive Stock Option

			
		  	         
	  	 Non-Statutory Stock Option

 Date Exercisable: The option shall become exercisable with respect to,
(i) twenty-five percent (25%) of the Option Shares upon Optionee’s completion of one (1) year of Service measured from the Vesting Commencement Date and (ii) the balance of the Option Shares in a series of thirty-six
(36) successive equal monthly installments upon Optionee’s completion of each additional month of Service over the thirty-six (36)-month period measured from the first anniversary of the Vesting Commencement Date. The Option shall not
become exercisable for any additional Option Shares following Optionee’s cessation of Service, except to the extent (if any) specifically authorized by the Plan Administrator in its sole discretion pursuant to an express written agreement with
Optionee. 
 Optionee understands and agrees that the Option is granted subject to and in accordance with the
terms of the GCT Semiconductor, Inc. 2010 Stock Option/Stock Issuance Plan (the “Plan”). Optionee further agrees to be bound by the terms of the Plan, the terms of the Option as set forth in the Stock Option Agreement attached hereto as
Exhibit A and the Code Section 409A Waiver and Release attached hereto as Exhibit B. Optionee understands that any Option Shares purchased under the Option will be subject to the terms set forth in the Stock Purchase Agreement attached hereto
as Exhibit C. Optionee hereby acknowledges receipt of a copy of the Plan in the form attached hereto as Exhibit D. 
 FIRST REFUSAL RIGHTS. OPTIONEE HEREBY AGREES THAT ALL OPTION SHARES ACQUIRED UPON THE EXERCISE OF THE OPTION SHALL BE SUBJECT TO CERTAIN RIGHTS OF FIRST REFUSAL EXERCISABLE BY THE

 
CORPORATION AND ITS ASSIGNS. THE TERMS OF SUCH RIGHTS ARE SPECIFIED IN THE ATTACHED STOCK PURCHASE AGREEMENT. 

At Will Employment. Nothing in this Notice or in the attached Stock Option Agreement or Plan shall confer upon
Optionee any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Corporation (or any Parent or Subsidiary employing or retaining Optionee) or of Optionee, which rights
are hereby expressly reserved by each, to terminate Optionee’s Service at any time for any reason, with or without cause. 
 Definitions. All capitalized terms in this Notice shall have the meaning assigned to them in this Notice or in the attached Stock Option Agreement. 

DATED:             ,          

 

			
	 GCT SEMICONDUCTOR, INC.

 

	 By:
	 	  

		
	 Title:
	 	  

		
		 	  

		 	, OPTIONEE            
		
	 Address:
	 	  

		
		 	  

 Attachments: 

Exhibit A - Stock Option Agreement 
 Exhibit B - Code Section 409A Waiver and Release 

Exhibit C - Stock Purchase Agreement 
 Exhibit D - 2010 Stock Option/Stock Issuance Plan 

 GCT SEMICONDUCTOR, INC.  

FORM OF STOCK OPTION AGREEMENT – KOREA OPTIONEE 

RECITALS 
 A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board or the board of directors of any Parent or Subsidiary and consultants
and other independent advisors in the service of the Corporation (or any Parent or Subsidiary). 
 B. Optionee
is to render valuable services to the Corporation (or a Parent or Subsidiary), and this Agreement is executed pursuant to, and is intended to carry out the purposes of, the Plan in connection with the Corporation’s grant of an option to
Optionee. 
 C. All capitalized terms in this Agreement shall have the meaning assigned to them in the attached
Appendix. 
 NOW, THEREFORE, it is hereby agreed as follows: 

1. Grant of Option. The Corporation hereby grants to Optionee, as of the Grant Date, an option to purchase
up to the number of Option Shares specified in the Grant Notice. The Option Shares shall be purchasable from time to time during the option term specified in Paragraph 2 at the Exercise Price. 

2. Option Term. This option shall have a term of ten (10) years measured from the Grant Date and shall
accordingly expire at the close of business on the Expiration Date, unless sooner terminated in accordance with Paragraph 5 or 6. 
 3. Limited Transferability. 
 (a) This option,
together with the Option Shares during the period prior to exercise, shall be neither transferable nor assignable by Optionee other than by will or the laws of inheritance following Optionee’s death and may be exercised, during Optionee’s
lifetime, only by Optionee. 
 (b) Prior to the date the Corporation first becomes subject to the reporting
requirements of Section 13 or 15(d) of the 1934 Act, this option, together with the underlying unexercised Option Shares, shall not be the subject of any short position, put equivalent position (as such term is defined in Rule 16a-1(h) under
the 1934 Act) or call equivalent position (as such term is defined Rule 16a-1(b) of the 1934 Act). 
 (c)
Except as otherwise provided in Paragraph 3(a) or 3(b), until the date the Corporation first becomes subject to the reporting requirements of Section 13 or 15(d) of the 1934 Act, this option, together with the underlying unexercised Option
Shares, shall not be the subject of any pledges, gifts, hypothecations or other transfers, other than in connection with 

 
a Change in Control in which this option, together with all other options outstanding under the Plan at such time, shall terminate and cease to be outstanding. 

4. Dates of Exercise. This option shall become exercisable for the Option Shares in one or more
installments as specified in the Grant Notice. As the option becomes exercisable for such installments, those installments shall accumulate, and the option shall remain exercisable for the accumulated installments until the Expiration Date or sooner
termination of the option term under Paragraph 5 or 6. 
 5. Cessation of Service. The option term
specified in Paragraph 2 shall terminate (and this option shall cease to be outstanding) prior to the Expiration Date should any of the following provisions become applicable: 

(a) Should Optionee cease to remain in Service for any reason (other than death, Disability or Misconduct) while this
option is outstanding, then Optionee shall have a period of three (3) months (commencing with the date of such cessation of Service) during which to exercise this option, but in no event shall this option be exercisable at any time after the
Expiration Date. 
 (b) Should Optionee die while this option is outstanding, then the personal representative
of Optionee’s estate or the person or persons to whom the option is transferred pursuant to Optionee’s will or the laws of inheritance following Optionee’s death shall have the right to exercise this option. Any such right to exercise
this option shall lapse, and this option shall cease to be outstanding, upon the earlier of (i) the expiration of the twelve (12)-month period measured from the date of Optionee’s death or (ii) the Expiration Date. 

(c) Should Optionee cease Service by reason of Disability while this option is outstanding, then Optionee shall have a
period of twelve (12) months (commencing with the date of such cessation of Service) during which to exercise this option. In no event shall this option be exercisable at any time after the Expiration Date. 

Note: Exercise of this option on a date later than three (3) months following cessation
of Service due to Disability will result in loss of favorable Incentive Option treatment, unless such Disability constitutes Permanent Disability. In the event that Incentive Option treatment is not available, this option will be taxed as a
Non-Statutory Option upon exercise. 
 (d) During the limited period of post-Service exercisability, this
option may not be exercised in the aggregate for more than the number of Option Shares in which Optionee is, at the time of Optionee’s cessation of Service, vested pursuant to the Exercise Schedule specified in the Grant Notice or the special
vesting acceleration provisions of Paragraph 6. No additional Option Shares shall vest, whether pursuant to the normal Exercise Schedule specified in the Grant Notice or the special vesting acceleration provisions of Paragraph 6, following
Optionee’s cessation of Service, except to the extent (if any) specifically authorized by the Plan Administrator pursuant to an express written agreement with Optionee. 

 
Upon the expiration of such limited exercise period or (if earlier) upon the Expiration Date, this option shall terminate and cease to be outstanding for any vested Option Shares for which the
option has not been exercised. 
 (e) Should Optionee’s Service be terminated for Misconduct or should
Optionee otherwise engage in Misconduct while this option is outstanding, then this option shall terminate immediately and cease to remain outstanding. 
 (f) For purposes of this Agreement, the period of Optionee’s Service shall not include any period of notice of cessation of employment, whether expressed or implied. Optionee’s date of cessation
of Service shall mean the date upon which Optionee ceases active performance of Services for the Corporation (or any Parent or Subsidiary) following the provision of such notification of termination or resignation from service and shall be
determined solely by the Corporation under this Agreement without reference to any other agreement, written or oral, including Optionee’s contract of employment. 

6. Change in Control. 

(a) Should a Change in Control occur during the Optionee’s period of Service, then the Option Shares at the time
subject to this option but not otherwise vested shall automatically vest in full so that this option shall, immediately prior to the effective date of the Change in Control, become exercisable for all of the Option Shares as fully vested shares and
may be exercised for any or all of those Option Shares as vested shares. However, the Option Shares shall not vest on such an accelerated basis if and to the extent: (i) this option is assumed by the successor corporation (or
parent thereof) or otherwise continued in full force and effect pursuant to the terms of the Change in Control transaction or (ii) this option is to be replaced with a cash retention program of the successor corporation which preserves the
spread existing on the unvested Option Shares at the time of the Change in Control (the excess of the Fair Market Value of those Option Shares over the Exercise Price payable for such shares) and provides for the subsequent vesting and payout of
that spread in accordance with the same Exercise Schedule applicable to those unvested Option Shares as set forth in the Grant Notice or (iii) such accelerated vesting is otherwise precluded pursuant to the provisions of Paragraph 5(d) above.

 (b) Immediately following the Change in Control, this option shall terminate and cease to be outstanding,
except to the extent assumed by the successor corporation (or parent thereof) or otherwise continued in full force and effect pursuant to the terms of the Change in Control transaction. 

(c) If this option is assumed in connection with a Change in Control or otherwise continued in effect, then this option
shall be appropriately adjusted, immediately after such Change in Control, to apply to the number and class of securities which would have been issuable to Optionee in consummation of such Change in Control had the option been exercised immediately
prior to such Change in Control, and appropriate adjustments shall also be made to the Exercise Price, provided the aggregate Exercise Price shall remain the same. To the extent that the actual holders of the Corporation’s outstanding
Common Stock receive cash 

 
consideration for their Common Stock in consummation of the Change in Control, the successor corporation may, in connection with the assumption or continuation of this option, substitute one or
more shares of its own common stock with a fair market value equivalent to the cash consideration paid per share of Common Stock in such Change in Control. 
 (d) This Agreement shall not in any way affect the right of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure or to merge, consolidate, dissolve,
liquidate or sell or transfer all or any part of its business or assets. 
 7. Adjustment in Option
Shares. In the event of any of the following transactions affecting the outstanding Common Stock as a class without the Corporation’s receipt of consideration: any stock split, stock dividend, spin-off transaction, extraordinary
distribution (whether in cash, securities or other property), recapitalization, combination of shares, exchange of shares or other similar transaction affecting the Common Stock without the Corporation’s receipt of consideration or in the event
of a substantial reduction to the value of the outstanding shares of Common Stock as a result of a spin-off transaction or extraordinary distribution, then equitable adjustments shall be made to (i) the total number and/or class of securities
subject to this option and (ii) the Exercise Price. The adjustments shall be made by the Plan Administrator in such manner as the Plan Administrator deems appropriate in order to reflect such change, and those adjustments shall be final,
binding and conclusive. 
 8. Stockholder Rights. The holder of this option shall not have any
stockholder rights with respect to the Option Shares until such person shall have exercised the option, paid the Exercise Price and become the record holder of the purchased shares. 

9. Manner of Exercising Option. 

(a) In order to exercise this option with respect to all or any part of the Option Shares for which this option is at the
time exercisable, Optionee (or any other person or persons exercising the option) must take the following actions: 
 (ii) Execute and deliver to the Corporation a Purchase Agreement for the Option Shares for which the option is exercised. 

(iii) Pay the aggregate Exercise Price for the purchased shares in one or more of the following forms:

 (A) cash or check made payable to the Corporation; or 

(B) a promissory note payable to the Corporation, but only to the extent authorized by the Plan
Administrator in accordance with Paragraph 14. 
 Should the Common Stock be registered under Section 12 of
the 1934 Act at the time the option is exercised, then the Exercise Price may also be paid as follows: 

 (C) in shares of Common Stock valued at Fair Market Value
on the Exercise Date and held by Optionee (or any other person or persons exercising the option) for the period (if any) necessary to avoid a charge to the Corporation’s earnings for financial reporting purposes; or 

(D) through a special sale and remittance procedure pursuant to which Optionee (or any other person or
persons exercising the option) shall concurrently provide irrevocable instructions (a) to a brokerage firm (reasonably satisfactory to the Corporation for purposes of administering such procedure in compliance with any applicable pre-clearance
or pre-notification requirements) to effect the immediate sale of the purchased shares and remit to the Corporation, out of the sale proceeds available on the settlement date, sufficient funds to cover the aggregate Exercise Price payable for the
purchased shares plus all applicable income and employment taxes required to be withheld by the Corporation by reason of such exercise and (b) to the Corporation to deliver the certificates for the purchased shares directly to such brokerage
firm on such settlement date in order to complete the sale. 
 Except to the extent the sale and remittance
procedure is utilized in connection with the option exercise, payment of the Exercise Price must accompany the Purchase Agreement delivered to the Corporation in connection with the option exercise. 

(iv) Furnish to the Corporation appropriate documentation that the person or persons exercising the
option (if other than Optionee) have the right to exercise this option. 
 (v) Execute and
deliver to the Corporation such written representations as may be requested by the Corporation in order for it to comply with the applicable requirements of applicable securities laws. 

(vi) Make appropriate arrangements with the Corporation (or Parent or Subsidiary employing or retaining
Optionee) for the satisfaction of all applicable income and employment tax withholding requirements applicable to the option exercise. 
 (b) As soon as practical after the Exercise Date, the Corporation shall issue to or on behalf of Optionee (or any other person or persons exercising this option) a certificate for the purchased Option
Shares, with the appropriate legends affixed thereto. 
 (c) In no event may this option be exercised for any
fractional shares. 
 10. Compliance with Laws and Regulations. 

(a) The exercise of this option and the issuance of the Option Shares upon such exercise shall be subject to compliance
by the Corporation and Optionee with all 

 
applicable requirements of law relating thereto and with all applicable regulations of any stock exchange on which the Common Stock may be listed for trading at the time of such exercise and
issuance. 
 (b) The inability of the Corporation to obtain approval from any regulatory body having authority
deemed by the Corporation to be necessary to the lawful issuance and sale of any Common Stock pursuant to this option shall relieve the Corporation of any liability with respect to the non-issuance or sale of the Common Stock as to which such
approval shall not have been obtained. The Corporation, however, shall use its best efforts to obtain all such approvals. 
 11. Successors and Assigns. Except to the extent otherwise provided in Paragraphs 3 and 6, the provisions of this Agreement shall inure to the benefit of, and be binding upon, the
Corporation and its successors and assigns and Optionee, Optionee’s assigns and the legal representatives, heirs and legatees of Optionee’s estate. 
 12. Notices. Any notice required to be given or delivered to the Corporation under the terms of this Agreement shall be in writing and addressed to the Corporation at its principal corporate
offices. Any notice required to be given or delivered to Optionee shall be in writing and addressed to Optionee at the address indicated below Optionee’s signature line on the Grant Notice. All notices shall be deemed effective upon personal
delivery or upon deposit in the U.S. mail, postage prepaid and properly addressed to the party to be notified. 

13. Financing. The Plan Administrator may, in its absolute discretion and without any obligation to do so,
permit Optionee to pay the Exercise Price for the purchased Option Shares by delivering a full-recourse promissory note bearing interest at a market rate and secured by those Option Shares. The payment schedule in effect for any such promissory note
shall be established by the Plan Administrator in its sole discretion. 
 14. Construction. This
Agreement and the option evidenced hereby are made and granted pursuant to the Plan and are in all respects limited by and subject to the terms of the Plan. All decisions of the Plan Administrator with respect to any question or issue arising under
the Plan or this Agreement shall be conclusive and binding on all persons having an interest in this option. 

15. Governing Law. The interpretation, performance and enforcement of this Agreement shall be governed by
the laws of the State of California without resort to that State’s conflict-of-laws rules. 
 16.
Stockholder Approval. If the Option Shares covered by this Agreement exceed, as of the Grant Date, the number of shares of Common Stock which may be issued under the Plan as last approved by the stockholders, then this option shall be
void with respect to such excess shares, unless stockholder approval of an amendment sufficiently increasing the number of shares of Common Stock issuable under the Plan is obtained in accordance with the provisions of the Plan. 

 17. Additional Terms Applicable to an Incentive Option. In the
event this option is designated an Incentive Option in the Grant Notice, the following terms and conditions shall also apply to the grant: 
 (a) This option shall cease to qualify for favorable tax treatment as an Incentive Option if (and to the extent) this option is exercised for one or more Option Shares: (i) more than three
(3) months after the date Optionee ceases to be an Employee for any reason other than death or Permanent Disability or (ii) more than twelve (12) months after the date Optionee ceases to be an Employee by reason of Permanent
Disability. 
 (b) This option shall not become exercisable in the calendar year in which granted if (and to
the extent) the aggregate Fair Market Value (determined at the Grant Date) of the Common Stock for which this option would otherwise first become exercisable in such calendar year would, when added to the aggregate value (determined as of the
respective date or dates of grant) of the Common Stock and any other securities for which one or more other Incentive Options granted to Optionee prior to the Grant Date (whether under the Plan or any other option plan of the Corporation or any
Parent or Subsidiary) first become exercisable during the same calendar year, exceed One Hundred Thousand Dollars ($100,000) in the aggregate. To the extent the exercisability of this option is deferred by reason of the foregoing limitation, the
deferred portion shall become exercisable in the first calendar year or years thereafter in which the One Hundred Thousand Dollar ($100,000) limitation of this Paragraph 18(b) would not be contravened, but such deferral shall in all events end
immediately prior to the effective date of a Change in Control in which this option is not to be assumed or otherwise continued in effect, whereupon the option shall become immediately exercisable as a Non-Statutory Option for the previously
deferred portion of the Option Shares. 
 (c) Should Optionee hold, in addition to this option, one or more
other options to purchase Common Stock which become exercisable for the first time in the same calendar year as this option, then for purposes of the foregoing limitations on the exercisability of such options as Incentive Options, this option and
each of those other options shall be deemed to become first exercisable in that calendar year on the basis of the chronological order in which they were granted, except to the extent otherwise provided under applicable law or regulation. 

18. Data Privacy. 
 (a) Optionee hereby explicitly and unambiguously consents to the collection, use, disclosure and transfer, in electronic or other form, of his or her personal data as described in this Agreement by and
among, as applicable, his or her employer, the Corporation and its Parent and Subsidiaries for the exclusive purpose of implementing, administering and managing his or her participation in the Plan. 

(b) Optionee understands that his or her employer, the Corporation and its Parent and Subsidiaries, as applicable,
hold certain personal information about him or her regarding Optionee’s employment, the nature and amount of Optionee’s compensation and the fact and conditions of Optionee’s participation in the Plan, including, but not limited to,
his or her name, home address and telephone number, 

 
date of birth, social insurance number or other identification number, salary, nationality, job title, any equity or directorships held in the Corporation and its Parent and Subsidiaries,
details of all options or any other entitlement to equity awarded, canceled, exercised, vested, unvested or outstanding in his or her favor, for the purpose of implementing, administering and managing the Plan (the “Data”). Optionee
understands that the Data may be transferred to any third parties assisting in the implementation, administration and management of the Plan, that these recipients may be located in his or her country, or elsewhere, and that the recipient’s
country may have different data privacy laws and protections than his or her country. Optionee understands that he or she may request a list with the names and addresses of any potential recipients of the Data by contacting Optionee’s local
human resources representative. Optionee authorizes the recipients to receive, possess, use, retain and transfer the Data, in electronic or other form, for the purposes of implementing, administering and managing his or her participation in the
Plan, including any requisite transfer of such Data as may be required to a broker or other third party. Optionee understands that the Data will be held only as long as is necessary to implement, administer and manage his or her participation in the
Plan. Optionee understands that he or she may, at any time, view the Data, request additional information about the storage and processing of the Data, require any necessary amendments to the Data or refuse or withdraw the consents herein, in any
case without cost, by contacting in writing his or her local human resources representative. Optionee understands, however, that refusing or withdrawing Optionee’s consent may affect his or her ability to participate in the Plan. For more
information on the consequences of Optionee’s refusal to consent or withdrawal of consent, Optionee understands that he or she may contact his or her local human resources representative. 

20. No Entitlement Or Claims For Compensation. In accepting the grant of this option, Optionee acknowledges
the following: 
 (vii) The Plan is established voluntarily by the Corporation, the grant of
options under the Plan is made at the discretion of the Plan Administrator and the Plan may be modified, amended, suspended or terminated by the Corporation at any time. 

(viii) The grant of this option is voluntary and occasional and does not create any contractual or other
right to receive future grants of options, or benefits in lieu of options, even if options have been granted repeatedly in the past. 
 (ix) All decisions with respect to future option grants, if any, will be at the sole discretion of the Plan Administrator. 

(x) Optionee is voluntarily participating in the Plan. 

(xi) This option is an extraordinary item that does not constitute compensation of any kind for services
of any kind rendered to the Corporation or any Parent or Subsidiary (including, as applicable, Optionee’s employer) and which is outside the scope of Optionee’s employment contract, if any. 

 (xii) This option is not to be considered part of
Optionee’s normal or expected compensation or salary for any purpose, including, but not limited to, calculating any severance, resignation, termination, payment in lieu of notice, redundancy, end of service payments, bonuses, long-service
awards, pension or retirement benefits or similar payments. 
 (xiii) In the event that
Optionee’s employer is not the Corporation, the grant of this option will not be interpreted to form an employment contract or relationship with the Corporation and, furthermore, the grant of this option will not be interpreted to form an
employment contract with Optionee’s employer or any Parent or Subsidiary of the Corporation. 
 (xiv) The future value of the underlying Option Shares is unknown and cannot be predicted with certainty. 

(xv) Optionee shall have no rights, claim or entitlement to compensation or damages as a result of
Optionee’s cessation of employment for any reason whatsoever, whether or not in breach of contract or local labor law, insofar as these rights, claim or entitlement arise or may arise from Optionee’s ceasing to have rights under or be
entitled to exercise this option as a result of such cessation or loss or diminution in value of the option or any of the Option Shares purchased through exercise of the option as a result of such cessation, and Optionee irrevocably releases his or
her employer, the Corporation and its Parent and Subsidiaries, as applicable, from any such rights, entitlement or claim that may arise. If, notwithstanding the foregoing, any such right or claim is found by a court of competent jurisdiction to have
arisen, then, by signing this Agreement, Optionee shall be deemed to have irrevocably waived his or her entitlement to pursue such rights or claim. 

 APPENDIX 

The following definitions shall be in effect under the Agreement: 

A. Agreement shall mean this Stock Option Agreement. 

B. Board shall mean the Corporation’s Board of Directors. 

C. Change in Control shall mean a change in ownership or control of the Corporation effected through any of
the following transactions: 
 a merger, consolidation or other reorganization approved by the
Corporation’s stockholders, unless securities representing more than fifty percent (50%) of the total combined voting power of the voting securities of the successor corporation are immediately thereafter beneficially owned, directly or
indirectly and in substantially the same proportion, by the persons who beneficially owned the Corporation’s outstanding voting securities immediately prior to such transaction, or 

a stockholder-approved sale, transfer or other disposition of all or substantially all of the
Corporation’s assets in liquidation or dissolution of the Corporation, or 
 the
acquisition, directly or indirectly by any person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation), of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly
to the Corporation’s stockholders. 
 In no event shall any public offering of the Corporation’s
securities be deemed to constitute a Change in Control. 
 D. Code shall mean the Internal Revenue
Code of 1986, as amended. 
 E. Common Stock shall mean the Corporation’s common stock.

 F. Corporation shall mean GCT Semiconductor, Inc., a Delaware corporation, and any successor
corporation to all or substantially all of the assets or voting stock of GCT Semiconductor, Inc. which shall by appropriate action assume this option. 
 G. Disability shall mean the inability of Optionee to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment and shall be determined
by the Plan Administrator on the basis of such medical evidence as the Plan Administrator deems warranted under the circumstances. Disability shall be 

 
deemed to constitute Permanent Disability in the event that such Disability is expected to result in death or has lasted or can be expected to last for a continuous period of twelve
(12) months or more. 
 H. Employee shall mean an individual who is in the employ of the
Corporation (or any Parent or Subsidiary), subject to the control and direction of the employer entity as to both the work to be performed and the manner and method of performance. 

I. Exercise Date shall mean the date on which the option shall have been exercised in accordance with
Paragraph 9 of the Agreement. 
 J. Exercise Price shall mean the exercise price payable per
Option Share as specified in the Grant Notice. 
 K. Exercise Schedule shall mean the exercise
schedule specified in the Grant Notice pursuant to which the Optionee is to vest in the Option Shares in a series of installments over his or her period of Service. 

L. Expiration Date shall mean the date on which the option expires as specified in the Grant Notice.

 M. Fair Market Value per share of Common Stock on any relevant date shall be determined in
accordance with the following provisions: 
 If the Common Stock is at the time traded on the
Nasdaq Global or Global Select Market, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question, as the price is reported by the National Association of Securities Dealers for that particular
Stock Exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which
such quotation exists. 
 If the Common Stock is at the time listed on any other Stock Exchange,
then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock, as such price is officially
quoted in the composite tape of transactions on such exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling
price on the last preceding date for which such quotation exists. 
 If the Common Stock is not
at the time listed on any Stock Exchange, then the Fair Market Value shall be determined by the Plan Administrator through the reasonable application of a reasonable valuation method that takes into account the applicable valuation factors set forth
in the Treasury Regulations issued under Section 409A of the Code; provided, however, 

 
that if the option is designated Incentive Option in the Grant Notice, then such Fair Market Value shall be determined in accordance with the standards of Section 422 and the applicable
Treasury Regulations thereunder. 
 N. Family Member shall mean any of the following members of
the Optionee’s family: any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law. 

O. Grant Date shall mean the date of grant of the option as specified in the Grant Notice. 

P. Grant Notice shall mean the Notice of Grant of Stock Option accompanying the Agreement, pursuant to
which Optionee has been informed of the basic terms of the option evidenced hereby. 
 Q. Incentive
Option shall mean an option which satisfies the requirements of Code Section 422. 
 R.
Misconduct shall mean the commission of any act of fraud, embezzlement or dishonesty by Optionee, any unauthorized use or disclosure by Optionee of confidential information or trade secrets of the Corporation (or any Parent or
Subsidiary), or any other intentional misconduct by Optionee adversely affecting the business or affairs of the Corporation (or any Parent or Subsidiary) in a material manner. The foregoing definition shall not in any way preclude or restrict the
right of the Corporation (or any Parent or Subsidiary) to discharge or dismiss Optionee or any other person in the Service of the Corporation (or any Parent or Subsidiary) for any other acts or omissions, but such other acts or omissions shall not
be deemed, for purposes of the Plan or this Agreement, to constitute grounds for termination for Misconduct. 

S. 1934 Act shall mean the Securities Exchange Act of 1934, as amended. 

T. Non-Statutory Option shall mean an option not intended to satisfy the requirements of Code
Section 422. 
 U. Option Shares shall mean the number of shares of Common Stock subject to
the option. 
 V. Optionee shall mean the person to whom the option is granted as specified in the
Grant Notice. 
 W. Parent shall mean any corporation (other than the Corporation) in an unbroken
chain of corporations ending with the Corporation, provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting
power of all classes of stock in one of the other corporations in such chain. 

 X. Plan shall mean the Corporation’s 2010 Stock
Option/Stock Issuance Plan. 
 Y. Plan Administrator shall mean either the Board or a committee of
the Board acting in its capacity as administrator of the Plan. 
 Z. Purchase Agreement shall mean
the stock purchase agreement in substantially the form of Exhibit C to the Grant Notice. 
 AA.
Service shall mean Optionee’s performance of services for the Corporation (or any Parent or Subsidiary, whether now existing or subsequently established) in the capacity of an Employee, a non-employee member of the board of
directors or a consultant or independent advisor. For purposes of this Agreement, Optionee shall be deemed to cease Service immediately upon the occurrence of the either of the following events: (i) Optionee no longer performs services in any
of the foregoing capacities for the Corporation or any Parent or Subsidiary or (ii) the entity for which Optionee is performing such services ceases to remain a Parent or Subsidiary of the Corporation, even though Optionee may subsequently
continue to perform services for that entity. Service shall not be deemed to cease during a period of military leave, sick leave or other personal leave approved by the Corporation; provided, however, that should such leave of absence exceed
three (3) months, then for purposes of determining the period within which the Option (if designated as an Incentive Option in the Grant Notice) may be exercised as such an Incentive Option under the federal tax laws, Optionee’s Service
shall be deemed to cease on the first day immediately following the expiration of such three (3)-month period, unless Optionee is provided with the right to return to Service following such leave either by statute or by written contract. Except to
the extent otherwise required by law or expressly authorized by the Plan Administrator or by the Corporation’s written policy on leaves of absence, no Service credit shall be given for vesting purposes for any period Optionee is on a leave of
absence. 
 BB. Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global or Global
Select Market or the New York Stock Exchange. 
 CC. Subsidiary shall mean any corporation (other
than the Corporation) in an unbroken chain of corporations beginning with the Corporation, provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent
(50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 

 GCT SEMICONDUCTOR, INC. 

FORM OF STOCK PURCHASE AGREEMENT – KOREA OPTIONEE 

AGREEMENT made this         day of
            , 20        by and between GCT Semiconductor, Inc., a Delaware corporation, and
                    , Optionee under the Corporation’s 2010 Stock Option/Stock Issuance Plan. 

All capitalized terms in this Agreement shall have the meaning assigned to them in this Agreement or in the attached
Appendix. 
  

	 	B.	 EXERCISE OF OPTION 

 1. Exercise. Optionee hereby purchases             shares of Common Stock (the “Purchased Shares”) pursuant to that
certain option (the “Option”) granted Optionee on                     ,
            (the “Grant Date”) to purchase up to                     shares of
Common Stock (the “Option Shares”) under the Plan at the exercise price of $            per share (the “Exercise Price”). 

2. Payment. Concurrently with the delivery of this Agreement to the Corporation, Optionee shall pay the
Exercise Price for the Purchased Shares in accordance with the provisions of the Option Agreement and shall deliver whatever additional documents may be required by the Option Agreement as a condition for exercise. 

3. Stockholder Rights. Until such time as the Corporation exercises the First Refusal Right, Optionee (or
any successor in interest) shall have all the rights of a stockholder (including voting, dividend and liquidation rights) with respect to the Purchased Shares, subject, however, to the transfer restrictions of Articles B and C. 

 

	 	B.	 SECURITIES LAW COMPLIANCE 

 4. Restricted Securities. The Purchased Shares have not been registered under the 1933 Act and are being issued to Optionee in reliance upon the exemption from such registration provided by
SEC Rule 701 for stock issuances under compensatory benefit plans such as the Plan. Optionee hereby confirms that Optionee has been informed that the Purchased Shares are restricted securities under the 1933 Act and may not be resold or transferred
unless the Purchased Shares are first registered under the Federal securities laws or unless an exemption from such registration is available. Accordingly, Optionee hereby acknowledges that Optionee is acquiring the Purchased Shares for investment
purposes only and not with a view to resale and is prepared to hold the Purchased Shares for an indefinite period and that Optionee is aware that SEC Rule 144 issued under the 1933 Act which exempts certain resales of unrestricted securities is not
presently available to exempt the resale of the Purchased Shares from the registration requirements of the 1933 Act. 

 5. Restrictions on Disposition of Purchased Shares. Optionee
shall make no disposition of the Purchased Shares (other than a Permitted Transfer) unless and until there is compliance with all of the following requirements: 

(i) Optionee shall have provided the Corporation with a written summary of the terms and conditions of the
proposed disposition. 
 (ii) Optionee shall have complied with all requirements of this
Agreement applicable to the disposition of the Purchased Shares. 
 (iii) Optionee shall have
provided the Corporation with written assurances, in form and substance satisfactory to the Corporation, that (a) the proposed disposition does not require registration of the Purchased Shares under the 1933 Act or (b) all appropriate
action necessary for compliance with the registration requirements of the 1933 Act or any exemption from registration available under the 1933 Act (including Rule 144) has been taken. 

The Corporation shall not be required (i) to transfer on its books any Purchased Shares which have been sold
or transferred in violation of the provisions of this Agreement or (ii) to treat as the owner of the Purchased Shares, or otherwise to accord voting, dividend or liquidation rights to, any transferee to whom the Purchased Shares have been
transferred in contravention of this Agreement. 
 6. Restrictive Legends. The stock certificates
for the Purchased Shares shall be endorsed with one or more of the following restrictive legends: 
 “The shares represented by this certificate have not been registered under the Securities Act of 1933. The shares may not be sold or offered for sale in the absence of (a) an effective
registration statement for the shares under such Act, (b) a ‘no action’ letter of the Securities and Exchange Commission with respect to such sale or offer or (c) satisfactory assurances to the Corporation that registration under
such Act is not required with respect to such sale or offer.” 
 “The shares
represented by this certificate are subject to certain rights of first refusal granted to the Corporation and accordingly may not be sold, assigned, transferred, encumbered, or in any manner disposed of except in conformity with the terms of a
written agreement dated             , 20        between the Corporation and the registered holder of the shares (or the predecessor in interest to
the shares). A copy of such agreement is maintained at the Corporation’s principal corporate offices.” 
  

	 	C.	 TRANSFER RESTRICTIONS 

 7. Restriction on Transfer. Except for any Permitted Transfer, Optionee shall not transfer, assign, encumber or otherwise dispose of any of the Purchased Shares in contravention of the First
Refusal Right or the Market Stand-Off. 

 8. Transferee Obligations. Each person (other than the
Corporation) to whom the Purchased Shares are transferred by means of a Permitted Transfer must, as a condition precedent to the validity of such transfer, acknowledge in writing to the Corporation that such person is bound by the provisions of this
Agreement and that the transferred shares are subject to (i) the First Refusal Right and (ii) the Market Stand-Off, to the same extent such shares would be so subject if retained by Optionee. 

9. Market Stand-Off. 

(a) In connection with any underwritten public offering by the Corporation of its equity securities pursuant to an
effective registration statement filed under the 1933 Act, including the Corporation’s initial public offering, Owner shall not sell, make any short sale of, loan, hypothecate, pledge, grant any option for the purchase of, or otherwise dispose
or transfer for value or otherwise agree to engage in any of the foregoing transactions with respect to, any Purchased Shares without the prior written consent of the Corporation or its underwriters. Such restriction (the “Market
Stand-Off”) shall be in effect for such period of time from and after the effective date of the final prospectus for the offering as may be requested by the Corporation or such underwriters. In no event, however, shall such period exceed one
hundred eighty (180) days, and the Market Stand-Off shall in no event be applicable to any underwritten public offering effected more than two (2) years after the effective date of the Corporation’s initial public offering.

 (b) Owner shall be subject to the Market Stand-Off provided and only if the officers and directors of the
Corporation are also subject to similar restrictions. 
 (c) Any new, substituted or additional securities
which are by reason of any Recapitalization or Reorganization distributed with respect to the Purchased Shares shall be immediately subject to the Market Stand-Off, to the same extent the Purchased Shares are at such time covered by such provisions.

 (d) In order to enforce the Market Stand-Off, the Corporation may impose stop-transfer instructions with
respect to the Purchased Shares until the end of the applicable stand-off period. 
  

	 	D.	 RIGHT OF FIRST REFUSAL 

 10. Grant. The Corporation is hereby granted the right of first refusal (the “First Refusal Right”), exercisable in connection with any proposed transfer of the Purchased Shares.
For purposes of this Article D, the term “transfer” shall include any sale, assignment, pledge, encumbrance or other disposition of the Purchased Shares intended to be made by Owner, but shall not include any Permitted Transfer.

 11. Notice of Intended Disposition. In the event any Owner of Purchased Shares desires to
accept a bona fide third-party offer for the transfer of any or all of such shares (the Purchased Shares subject to such offer to be hereinafter referred to as the “Target Shares”), Owner shall promptly (i) deliver to the Corporation
written notice (the “Disposition Notice”) of 

 
the terms of the offer, including the purchase price and the identity of the third-party offeror, and (ii) provide satisfactory proof that the disposition of the Target Shares to such
third-party offeror would not be in contravention of the provisions set forth in Articles B and C. 
 12.
Exercise of the First Refusal Right. The Corporation shall, for a period of twenty-five (25) days following receipt of the Disposition Notice, have the right to repurchase any or all of the Target Shares subject to the Disposition
Notice upon the same terms as those specified therein or upon such other terms (not materially different from those specified in the Disposition Notice) to which Owner consents. Such right shall be exercisable by delivery of written notice (the
“Exercise Notice”) to Owner prior to the expiration of the twenty-five (25)-day exercise period. If such right is exercised with respect to all the Target Shares, then the Corporation shall effect the repurchase of such shares, including
payment of the purchase price, not more than five (5) business days after delivery of the Exercise Notice; and at such time the certificates representing the Target Shares shall be delivered to the Corporation. 

Should the purchase price specified in the Disposition Notice be payable in property other than cash or evidences of
indebtedness, the Corporation shall have the right to pay the purchase price in the form of cash equal in amount to the value of such property. If Owner and the Corporation cannot agree on such cash value within ten (10) days after the
Corporation’s receipt of the Disposition Notice, the valuation shall be made by an appraiser of recognized standing selected by Owner and the Corporation or, if they cannot agree on an appraiser within twenty (20) days after the
Corporation’s receipt of the Disposition Notice, each shall select an appraiser of recognized standing and the two (2) appraisers shall designate a third appraiser of recognized standing, whose appraisal shall be determinative of such
value. The cost of such appraisal shall be shared equally by Owner and the Corporation. The closing shall then be held on the later of (i) the fifth (5th) business day following delivery of the Exercise Notice or (ii) the fifth
(5th) business day after such valuation shall have been made. 
 13. Non-Exercise of the First
Refusal Right. In the event the Exercise Notice is not given to Owner prior to the expiration of the twenty-five (25)-day exercise period, Owner shall have a period of thirty (30) days thereafter in which to sell or otherwise dispose of
the Target Shares to the third-party offeror identified in the Disposition Notice upon terms (including the purchase price) no more favorable to such third-party offeror than those specified in the Disposition Notice; provided, however, that
any such sale or disposition must not be effected in contravention of the provisions of Articles B and C. The third-party offeror shall acquire the Target Shares subject to the First Refusal Right and the provisions and restrictions of Article B and
Paragraph C.3, and any subsequent disposition of the acquired shares must be effected in compliance with the terms and conditions of such First Refusal Right and the provisions and restrictions of Article B and Paragraph C.3. In the event Owner does
not effect such sale or disposition of the Target Shares within the specified thirty (30)-day period, the First Refusal Right shall continue to be applicable to any subsequent disposition of the Target Shares by Owner until such right lapses.

 14. Partial Exercise of the First Refusal Right. In the event the Corporation makes a timely
exercise of the First Refusal Right with respect to a portion, but not all, of the Target Shares specified in the Disposition Notice, Owner shall have the option, exercisable by 

 
written notice to the Corporation delivered within five (5) business days after Owner’s receipt of the Exercise Notice, to effect the sale of the Target Shares pursuant to either of the
following alternatives: 
 (i) sale or other disposition of all the Target Shares to the
third-party offeror identified in the Disposition Notice, but in full compliance with the requirements of Paragraph D.4, as if the Corporation did not exercise the First Refusal Right; or 

(ii) sale to the Corporation of the portion of the Target Shares which the Corporation has elected to
purchase, such sale to be effected in substantial conformity with the provisions of Paragraph D.3. The First Refusal Right shall continue to be applicable to any subsequent disposition of the remaining Target Shares until such right lapses.

 Owner’s failure to deliver timely notification to the Corporation shall be deemed to be an election by
Owner to sell the Target Shares pursuant to alternative (i) above. 
 15.
Recapitalization/Reorganization. 
 (a) Any new, substituted or additional securities or other
property which is by reason of any Recapitalization distributed with respect to the Purchased Shares shall be immediately subject to the First Refusal Right, but only to the extent the Purchased Shares are at the time covered by such right.

 (b) In the event of a Reorganization, the First Refusal Right shall remain in full force and effect and
shall apply to the new capital stock or other property received in exchange for the Purchased Shares in consummation of the Reorganization, but only to the extent the Purchased Shares are at the time covered by such right. 

16. Lapse. The First Refusal Right shall lapse upon the earliest to occur of (i) the first date
on which shares of the Common Stock are held of record by more than five hundred (500) persons, (ii) a determination made by the Board that a public market exists for the outstanding shares of Common Stock or (iii) a firm commitment
underwritten public offering, pursuant to an effective registration statement under the 1933 Act, covering the offer and sale of the Common Stock in the aggregate amount of at least twenty million dollars ($20,000,000). However, the Market Stand-Off
shall continue to remain in full force and effect following the lapse of the First Refusal Right. 
  

	 	F.	 GENERAL PROVISIONS 

 17. Assignment. The Corporation may assign the First Refusal Right to any person or entity selected by the Board, including (without limitation) one or more stockholders of the Corporation.

 18. At Will Employment. Nothing in this Agreement or in the Plan shall confer upon Optionee any
right to continue in Service for any period of specific duration or 

 
interfere with or otherwise restrict in any way the rights of the Corporation (or any Parent or Subsidiary employing or retaining Optionee) or of Optionee, which rights are hereby expressly
reserved by each, to terminate Optionee’s Service at any time for any reason, with or without cause. 
 19.
Notices. Any notice required to be given under this Agreement shall be in writing and shall be deemed effective upon personal delivery or upon deposit in the U.S. mail, registered or certified, postage prepaid and properly addressed to
the party entitled to such notice at the address indicated below such party’s signature line on this Agreement or at such other address as such party may designate by ten (10) days advance written notice under this paragraph to all other
parties to this Agreement. 
 20. No Waiver. The failure of the Corporation in any instance to
exercise the First Refusal Right shall not constitute a waiver of any other rights of first refusal that may subsequently arise under the provisions of this Agreement or any other agreement between the Corporation and Optionee. No waiver of any
breach or condition of this Agreement shall be deemed to be a waiver of any other or subsequent breach or condition, whether of like or different nature. 
  

	 	E.	 MISCELLANEOUS PROVISIONS 

 21. Optionee Undertaking. Optionee hereby agrees to take whatever additional action and execute whatever additional documents the Corporation may deem necessary or advisable in order to
carry out or effect one or more of the obligations or restrictions imposed on either Optionee or the Purchased Shares pursuant to the provisions of this Agreement. 

22. Agreement is Entire Contract. This Agreement constitutes the entire contract between the parties hereto
with regard to the subject matter hereof. This Agreement is made pursuant to the provisions of the Plan and shall in all respects be construed in conformity with the terms of the Plan. 

23. Governing Law. This Agreement shall be governed by, and construed in accordance with, the laws of the
State of California without resort to that State’s conflict-of-laws rules. 
 24. Counterparts.
This Agreement may be executed in counterparts, each of which shall be deemed to be an original, but all of which together shall constitute one and the same instrument. 

25. Successors and Assigns. The provisions of this Agreement shall inure to the benefit of, and be binding
upon, the Corporation and its successors and assigns and upon Optionee, Optionee’s permitted assigns and the legal representatives, heirs and legatees of Optionee’s estate, whether or not any such person shall have become a party to this
Agreement and have agreed in writing to join herein and be bound by the terms hereof. 

 IN WITNESS WHEREOF, the parties have executed this Agreement
on the day and year first indicated above. 
  

			
	
	 GCT SEMICONDUCTOR, INC.

		
	 By:
	 	  

		
	 Title:
	 	  

		
	 Address:
	 	  

		
		 	  

		
		 	  
 , OPTIONEE

		
	 Address:
	 	  

		
		 	  

 APPENDIX 

The following definitions shall be in effect under the Agreement: 

A. Agreement shall mean this Stock Purchase Agreement. 

B. Board shall mean the Corporation’s Board of Directors. 

C. Change in Control shall mean a change in ownership or control of the Corporation effected through any of
the following transactions: 
 a merger, consolidation or other reorganization approved by the
Corporation’s stockholders, unless securities representing more than fifty percent (50%) of the total combined voting power of the voting securities of the successor corporation are immediately thereafter beneficially owned, directly or
indirectly and in substantially the same proportion, by the persons who beneficially owned the Corporation’s outstanding voting securities immediately prior to such transaction, or 

a stockholder-approved sale, transfer or other disposition of all or substantially all of the
Corporation’s assets in liquidation or dissolution of the Corporation, or 
 the
acquisition, directly or indirectly by any person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation), of beneficial ownership
(within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly
to the Corporation’s stockholders. 
 In no event shall any public offering of the Corporation’s
securities be deemed to constitute a Change in Control. 
 D. Code shall mean the Internal Revenue
Code of 1986, as amended. 
 E. Common Stock shall mean the Corporation’s common stock.

 F. Corporation shall mean GCT Semiconductor, Inc., a Delaware corporation, and any successor
corporation to all or substantially all of the assets or voting stock of GCT Semiconductor, Inc. which shall by appropriate action adopt the Plan. 
 G. Disposition Notice shall have the meaning assigned to such term in Paragraph D.2. 

 H. Exercise Price shall have the meaning assigned to such term
in Paragraph A.1. 
 I. Fair Market Value per share of Common Stock on any relevant date
shall be determined in accordance with the following provisions: 
 If the Common Stock is at the
time traded on the Nasdaq Global or Global Select Market, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question, as such price is reported by the National Association of Securities Dealers
for that particular Stock Exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last
preceding date for which such quotation exists. 
 If the Common Stock is at the time listed on
any other Stock Exchange, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock, as
such price is officially quoted in the composite tape of transactions on such exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value
shall be the closing selling price on the last preceding date for which such quotation exists. 

If the Common Stock is not at the time listed on any Stock Exchange, then the Fair Market Value shall be
determined by the Plan Administrator through the reasonable application of a reasonable valuation method that takes into account the applicable valuation factors set forth in the Treasury Regulations issued under Section 409A of the Code.

 J. Family Member shall mean any of the following members of the Optionee’s family: any
child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law. 

K. First Refusal Right shall mean the right granted to the Corporation in accordance with Article D.

 L. Grant Date shall have the meaning assigned to such term in Paragraph A.1. 

M. Grant Notice shall mean the Notice of Grant of Stock Option pursuant to which Optionee has been informed
of the basic terms of the Option. 
 N. Incentive Option shall mean an option which satisfies the
requirements of Code Section 422. 

 O. Market Stand-Off shall mean the market stand-off
restriction specified in Paragraph C.3. 
 P. 1933 Act shall mean the Securities Act of 1933, as
amended. 
 Q. 1934 Act shall mean the Securities Exchange Act of 1934, as amended. 

R. Non-Statutory Option shall mean an option not intended to satisfy the requirements of Code
Section 422. 
 S. Option shall have the meaning assigned to such term in Paragraph A.1.

 T. Option Agreement shall mean all agreements and other documents evidencing the Option.

 U. Optionee shall mean the person to whom the Option is granted under the Plan. 

V. Owner shall mean Optionee and all subsequent holders of the Purchased Shares who derive their chain of
ownership through a Permitted Transfer from Optionee. 
 W. Parent shall mean any corporation
(other than the Corporation) in an unbroken chain of corporations ending with the Corporation, provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent
(50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 
 X. Permitted Transfer shall mean (i) a gratuitous transfer of the Purchased Shares to one or more of the Optionee’s Family Members or to a trust established for Optionee or one or
more such Family Members, provided and only if Optionee obtains the Corporation’s prior written consent to such transfer, (ii) a transfer of title to the Purchased Shares effected pursuant to Optionee’s will or the laws of inheritance
following Optionee’s death or (iii) a transfer to the Corporation in pledge as security for any purchase-money indebtedness incurred by Optionee in connection with the acquisition of the Purchased Shares. 

Y. Plan shall mean the Corporation’s 2010 Stock Option/Stock Issuance Plan. 

Z. Plan Administrator shall mean either the Board or a committee of the Board acting in its capacity as
administrator of the Plan. 
 AA. Purchased Shares shall have the meaning assigned to such term in
Paragraph A.1. 
 BB. Recapitalization shall mean any of the following transactions affecting the
Corporation’s outstanding Common Stock as a class without the Corporation’s receipt of consideration: any stock split, stock dividend, spin-off transaction, extraordinary distribution

 
(whether in cash, securities or other property), recapitalization, combination of shares, exchange of shares or other similar transaction affecting the Common Stock without the Corporation’s
receipt of consideration. 
 CC. Reorganization shall mean any of the following transactions:

 a merger or consolidation in which the Corporation is not the surviving entity, 

a sale, transfer or other disposition of all or substantially all of the Corporation’s assets,

 a reverse merger in which the Corporation is the surviving entity but in which the
Corporation’s outstanding voting securities are transferred in whole or in part to a person or persons different from the persons holding those securities immediately prior to the merger, or 

any transaction effected primarily to change the state in which the Corporation is incorporated or to
create a holding company structure. 
 DD. SEC shall mean the Securities and Exchange Commission.

 EE. Service shall mean Optionee’s performance of services for the Corporation (or any
Parent or Subsidiary, whether now existing or subsequently established) in the capacity of an Employee, a non-employee member of the board of directors or a consultant or independent advisor. For purposes of this Agreement, Optionee shall be deemed
to cease Service immediately upon the occurrence of the either of the following events: (i) Optionee no longer performs services in any of the foregoing capacities for the Corporation or any Parent or Subsidiary or (ii) the entity for
which Optionee is performing such services ceases to remain a Parent or Subsidiary of the Corporation, even though Optionee may subsequently continue to perform services for that entity. Service shall not be deemed to cease during a period of
military leave, sick leave or other personal leave approved by the Corporation. However, except to the extent otherwise required by law or expressly authorized by the Plan Administrator or by the Corporation’s written policy on leaves of
absence, no Service credit shall be given for vesting purposes for any period Optionee is on a leave of absence. 
 FF. Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global or Global Select Market or the New York Stock Exchange. 

GG. Subsidiary shall mean any corporation (other than the Corporation) in an unbroken chain of corporations
beginning with the Corporation, provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all
classes of stock in one of the other corporations in such chain. 

 HH. Target Shares shall have the meaning assigned to such term
in Paragraph D.2.2011 Employee Stock Purchase Plan

 Exhibit 10.8 
 GCT SEMICONDUCTOR, INC. 
 2011 EMPLOYEE STOCK PURCHASE PLAN

  

	 	I.	 PURPOSE OF THE PLAN 

 This Employee Stock Purchase Plan is intended to promote the interests of GCT Semiconductor, Inc., a Delaware corporation, by providing eligible employees with the opportunity to acquire a proprietary
interest in the Corporation through participation in an employee stock purchase plan designed to qualify under Section 423 of the Code for one or more specified offerings made under such plan. 

The Plan shall become effective at the time (the “Effective Time”) at which the underwriting agreement for the
initial public offering of the Common Stock is executed and the price per share established for the Common Stock to be sold in such offering. 
 Capitalized terms herein shall have the meanings assigned to such terms in the attached Appendix. 
  

	 	II.	 ADMINISTRATION OF THE PLAN 

 A. The Plan Administrator shall have full authority to interpret and construe any provision of the Plan and to adopt such rules and regulations for administering the Plan as it may deem necessary in order
to bring one or more offerings under the Plan into compliance with the requirements of Code Section 423. 

B. The Plan Administer may authorize one or more offerings under the Plan that are not designed to comply with the
requirements of Code Section 423 but with the requirements of the foreign jurisdictions in which those offerings are conducted. Such offerings shall be separate from any offerings designed to comply with the Code Section 423 requirements
but may be conducted concurrently with those offerings. 
 C. Decisions of the Plan Administrator shall be final
and binding on all parties having an interest in the Plan. 
  

	 	III.	 STOCK SUBJECT TO PLAN 

 A. The stock purchasable under the Plan shall be shares of authorized but unissued or reacquired Common Stock, including shares of Common Stock purchased on the open market. The number of shares of Common
Stock reserved for issuance over the term of the Plan shall be limited to 3,000,000 shares. 
 B. The number of
shares of Common Stock available for issuance under the Plan shall automatically increase on the first trading day in July each calendar year during the term of the Plan, beginning with the 2012 calendar year, by an amount equal to one percent
(1%) of the total number of shares of Common Stock actually outstanding on the last trading day in the immediately preceding calendar month, but in no event shall any such annual increase exceed 2,500,000 shares. 

 C. Should any change be made to the Common Stock by reason of any stock
split, stock dividend, recapitalization, combination of shares, exchange of shares, spin-off transaction or other change affecting the outstanding Common Stock as a class without the Corporation’s receipt of consideration or should the value of
outstanding shares of Common Stock be substantially reduced as a result of a spin-off transaction or an extraordinary dividend or distribution, then equitable adjustments shall be made by the Plan Administrator to (i) the maximum number and
class of securities issuable under the Plan, (ii) the maximum number and class of securities by which the share reserve is to increase automatically each calendar year pursuant to the provisions of Section III.B of this Article One,
(iii) the maximum number and class of securities purchasable per Participant during any offering period and on any one Purchase Date during that offering period, (iv) the maximum number and class of securities purchasable in total by all
Participants under the Plan on any one Purchase Date and (v) the number and class of securities and the price per share in effect under each outstanding purchase right. The adjustments shall be made in such manner as the Plan Administrator
deems appropriate, and such adjustments shall be final, binding and conclusive. 
  

	 	IV.	 OFFERING PERIODS 

 A. Shares of Common Stock shall be offered for purchase under the Plan through a series of successive offering periods until such time as (i) the maximum number of shares of Common Stock available
for issuance under the Plan shall have been purchased or (ii) the Plan shall have been sooner terminated. 

B. Unless otherwise specified by the Plan Administrator prior to the start of the applicable offering period: 

(i) each offering period shall have a duration of twenty-four (24) months, and 

(ii) offering periods shall commence on the first business day of May and the first business day of
November each year. 
 However, the initial offering period under the Plan shall commence at the
Effective Time and shall be of such duration (not to exceed twenty-seven (27) months) as determined by the Plan Administrator. 
 C. The terms and conditions of each offering period may vary, and two or more offerings periods may run concurrently under the Plan, each with its own terms and conditions. In addition, special offering
periods may be established with respect to entities that are acquired by the Corporation (or any subsidiary of the Corporation) or under such other circumstances as the Plan Administrator deems appropriate. In no event, however, shall the terms and
conditions of any offering period contravene the express limitations and restrictions of the Plan, and the participants in each separate offering period conducted by one or more Participating Corporations in the United States shall have equal rights
and privileges under that offering in accordance with the requirements of Section 423(b)(5) of the Code and the applicable Treasury Regulations thereunder. 

  
 2. 

 D. Unless otherwise specified by the Plan Administrator prior to the start
of the applicable offering period, each offering period shall be comprised of four successive Purchase Intervals. Purchase Intervals shall run from the first business day in May to the last business day in October each year and from the first
business day in November each year to the last business day in April in the following year. However, the first Purchase Interval under the Plan shall commence at the Effective Time and shall be of such duration as determined by the Plan
Administrator. 
 E. Should the Fair Market Value per share of Common Stock on any Purchase Date within an
offering period be less than the Fair Market Value per share of Common Stock on the start date of that offering period, then the individuals participating in that offering period shall, immediately after the purchase of shares of Common Stock on
their behalf on such Purchase Date, be transferred from that offering period and automatically enrolled in the offering period commencing on the next business day following such Purchase Date, provided and only if the Fair Market Value per share of
Common Stock on the start date of that new offering period is lower than the Fair Market Value per share of Common Stock on the start date of the offering period in which they were currently enrolled. 

 

	 	V.	 ELIGIBILITY 

 A. Each individual who is an Eligible Employee on the start date of an offering period under the Plan may enter that offering period only on such start date. However, an Eligible Employee may participate
in only one offering period at a time. For the initial offering period commencing at the Effective Time, each individual who is an Eligible Employee at that time shall automatically be enrolled as a Participant at a contribution level set at fifteen
percent (15%) of his or her Cash Earnings. 
 B. The date an individual enters an offering period shall be
designated his or her Entry Date for purposes of that offering period. 
 C. Each U.S. corporation that becomes
a Corporate Affiliate after the Effective Time shall automatically become a Participating Corporation effective as of the start date of the first offering date coincident with or next following the date on which it becomes such an affiliate, unless
the Plan Administrator determines otherwise prior to the start date of that offering period. Each non-U.S. corporation that becomes a Corporate Affiliate after the Effective Time shall become a Participating Corporation when authorized by the Plan
Administrator to extend the benefits of the Plan to its Eligible Employees. 
 D. Except as otherwise provided
in Sections IV.D and V.A above, the Eligible Employee must, in order to participate in the Plan for a particular offering period, complete the enrollment forms prescribed by the Plan Administrator (including a stock purchase agreement and a payroll
deduction authorization or other authorization form for any other form of contribution permitted for that offering period) and file such forms with the Plan Administrator (or its designate) on or before his or her scheduled Entry Date. 

  
 3. 

	 	VI.	 PAYROLL DEDUCTIONS/OTHER FORMS OF CONTRIBUTION 

A. For each offering period, the Plan Administrator may allow contributions to the Plan to be effected in the form of
periodic payroll deductions or one or more other forms of permitted contribution specified by the Plan Administrator prior to the start date of the applicable offering period. However, all contributions, whether in the form of payroll deductions or
other mode, shall be made solely on the basis of the Participant’s Cash Earnings for the offering period. Unless the Plan Administrator determines otherwise prior to the start of the applicable offering period: 

(i) Participant contributions for each offering period shall be solely in the form of payroll deductions,
and 
 (ii) the payroll deductions or other form of permitted contribution that each Participant
may authorize for purposes of acquiring shares of Common Stock during an offering period may be in any multiple of one percent (1%) of the Cash Earnings paid to that Participant during each Purchase Interval within such offering period, up to a
maximum of fifteen percent (15%), unless the Plan Administrator establishes a different maximum percentage prior to the start date of the applicable offering period. 

B. Payroll deductions or other permitted forms of contribution collected in a currency other than U.S. Dollars shall be
converted into U.S. Dollars on the last day of the Purchase Interval in which collected, with such conversion to be based on the exchange rate in effect on such day. The Plan Administrator shall have absolute discretion to determine the applicable
exchange rate to be in effect for such day. 
 C. For the initial Purchase Interval of the first offering period
under the Plan, no payroll deductions or other form of permitted contribution shall be required of any Participant until such time as the Participant affirmatively elects to commence such payroll deductions or other form of permitted contribution
following his or her receipt of the 1933 Act prospectus for the Plan. For such Purchase Interval, the Participant will be required to contribute up to fifteen percent (15%) of his or her Cash Earnings to the Plan either in a lump sum or one or
more installments after receipt of such prospectus and prior to the close of that Purchase Interval should the Participant elect to have shares of Common Stock purchased on his or her behalf on the Purchase Date for that initial Purchase Interval
and his or her limited payroll deductions (if any) for such Purchase Interval not be sufficient to fund the entire purchase price for those shares. 
 D. The rate of payroll deduction or other permitted form of contribution shall continue in effect throughout the offering period, except for changes effected in accordance with the following guidelines:

 (i) The Participant may, at any time during the offering period, reduce the rate of his or her
payroll deduction or other permitted form of contribution (or the percentage of Cash Earnings to be contributed for the first Purchase Interval of the initial offering period under the Plan) to become effective as soon as administratively possible
after filing the 

  
 4. 

 
appropriate form with the Plan Administrator. The Participant may not, however, effect more than one (1) such reduction per Purchase Interval. 

(ii) The Participant may, at any time during the offering period, increase the rate of his or her payroll
deduction or other permitted form of contribution (up to the maximum percentage limit for that offering period) to become effective as soon as administratively possible after filing the appropriate form with the Plan Administrator. The Participant
may not, however, effect more than one (1) such increase per Purchase Interval. 

  
 5. 

 (iii) The Participant may at any time reduce his or her rate
of payroll deduction under the ESPP or other form of permitted contribution to 0%. Such reduction shall become effective as soon as administratively practicable following the filing of the appropriate form with the Plan Administrator. The
Participant’s existing payroll deductions or other permitted form of contribution authorized for the Purchase Interval in which such reduction occurs shall be applied to the purchase of shares of Common Stock on the next scheduled Purchase
Date. 
 E. Except as otherwise provided in Section VI.C above, payroll deductions shall begin on the first pay
day administratively feasible following the Participant’s Entry Date into the offering period and shall (unless sooner terminated by the Participant) continue through the pay day ending with or immediately prior to the last day of that offering
period. To the extent the Plan Administrator permits other forms of contribution for an offering period, those permitted contributions at the level authorized by each affected Participant shall be collected in the manner specified by the Plan
Administrator for that offering period. The payroll deductions or other permitted forms of contribution so collected shall be credited to the Participant’s book account under the Plan, but no interest shall be paid on the balance from time to
time outstanding in such account, unless otherwise required by the terms of that offering period. Unless the Plan Administrator determines otherwise prior to the start of the applicable offering period, the amounts collected from the Participant
shall not be required to be held in any segregated account or trust fund and may be commingled with the general assets of the Corporation and used for any corporate purpose. 

F. Payroll deductions or other permitted form of contribution authorized by the Participant shall automatically cease
upon the termination of the Participant’s purchase right in accordance with the provisions of the Plan. 

G. The Participant’s acquisition of Common Stock under the Plan on any Purchase Date shall neither limit nor require
the Participant’s acquisition of Common Stock on any subsequent Purchase Date, whether within the same or a different offering period. 
  

	 	VII.	 PURCHASE RIGHTS 

 A. Grant of Purchase Right. A Participant shall be granted a separate purchase right for each offering period in which he or she participates. The purchase right shall be granted on the
Participant’s Entry Date into the offering period. Unless the Plan Administrator determines otherwise prior to the start date of the applicable offering period and subject to the limitations of Article VIII below, each purchase right granted
for an offering period shall provide the Participant with the right to purchase up to 2,000 shares of Common Stock on each Purchase Date within that offering period for a maximum of 8,000 shares of Common Stock for an offering period comprised of
four Purchase Intervals. The Participant shall execute a stock purchase agreement embodying such terms and such other provisions (not inconsistent with the Plan) as the Plan Administrator may deem advisable. The same purchase limitations shall be in
effect for the initial offering period under the Plan commencing at the Effective Time and for each of the four Purchase Intervals within that initial offering period. 

  
 6. 

 Under no circumstances shall purchase rights be granted under the Plan to
any Eligible Employee if such individual would, immediately after the grant, own (within the meaning of Code Section 424(d)) or hold outstanding options or other rights to purchase, stock possessing five percent (5%) or more of the total
combined voting power or value of all classes of stock of the Corporation or any Corporate Affiliate. 
 B.
Exercise of the Purchase Right. Each purchase right shall be automatically exercised in installments on each successive Purchase Date within the offering period, and shares of Common Stock shall accordingly be purchased on behalf of
each Participant (other than Participants whose payroll deductions or other authorized contributions have previously been refunded pursuant to the Termination of Purchase Right provisions below) on each such Purchase Date. The purchase shall be
effected by applying the Participant’s authorized payroll deductions or other form of permitted contribution for the Purchase Interval ending on such Purchase Date to the purchase of whole shares of Common Stock at the purchase price in effect
for the Participant for that Purchase Date. 
 C. Purchase Price. The purchase price per
share at which Common Stock will be purchased on the Participant’s behalf on each Purchase Date within the offering period will be established by the Plan Administrator prior to the start of that offering period, but in no event shall such
purchase price be less than eighty-five percent (85%) of the lower of (i) the Fair Market Value per share of Common Stock on the Participant’s Entry Date into that offering period or (ii) the Fair Market Value per share of
Common Stock on that Purchase Date. 
 D. Number of Purchasable Shares. The number of shares of
Common Stock purchasable by a Participant on each Purchase Date during the offering period shall be the number of whole shares obtained by dividing the amount collected from the Participant through his or her authorized payroll deductions or other
permitted form of contribution during the Purchase Interval ending with that Purchase Date by the purchase price in effect for the Participant for that Purchase Date. However, the maximum number of shares of Common Stock purchasable per Participant
on any one Purchase Date shall be governed by the limitation set forth in Article VII.A, as adjusted periodically in the event of certain changes in the Corporation’s capitalization. In addition, the maximum number of shares of Common Stock
purchasable in total by all Participants on any one Purchase Date shall not exceed 750,000 shares, subject to periodic adjustments in the event of certain changes in the Corporation’s capitalization. However, the Plan Administrator shall have
the discretionary authority, exercisable prior to the start of any offering period under the Plan, to increase or decrease the limitations to be in effect for the number of shares purchasable per Participant (and the corresponding maximum number of
shares purchasable per Participant for that offering period) and in total by all Participants on each Purchase Date within that offering period. 
 E. Excess Payroll Deductions/Contributions. Any authorized payroll deductions or other permitted form of contribution not applied to the purchase of shares of Common Stock on any Purchase
Date because they are not sufficient to purchase a whole share of Common Stock shall be held for the purchase of Common Stock on the next Purchase Date. However, any authorized payroll deductions or other permitted form of contribution not applied
to the purchase of Common Stock by reason of the limitation on the maximum number of shares purchasable per Participant or in the aggregate on the Purchase Date shall be promptly refunded. 

  
 7. 

 F. Suspension of Payroll Deductions/Contributions. In the
event that a Participant is, by reason of the accrual limitations in Article VIII, precluded from purchasing additional shares of Common Stock on one or more Purchase Dates during the offering period in which he or she is enrolled, then no further
payroll deductions or other permitted form of contribution authorized by the Participant for that offering period shall be collected from such Participant with respect to those Purchase Dates. The suspension of such deductions or contributions shall
not terminate the Participant’s purchase right for the offering period in which he or she is enrolled, and the Participant’s authorized payroll deductions or other permitted form of contribution shall automatically resume on behalf of such
Participant once he or she is again able to purchase shares during that offering period in compliance with the accrual limitations of Article VIII. 
 G. Termination of Purchase Right. The following provisions shall govern the termination of outstanding purchase rights: 

(i) A Participant may withdraw from the offering period in which he or she is enrolled by filing the
appropriate form with the Plan Administrator (or its designate) at any time prior to the next scheduled Purchase Date in that offering period, and no further payroll deductions or other permitted form of contribution shall be collected from the
Participant with respect to the offering period. Any payroll deductions or other permitted form of contribution authorized by the Participant and collected during the Purchase Interval in which such withdrawal occurs shall, at the Participant’s
election, be immediately refunded or held for the purchase of shares on the next Purchase Date. If no such election is made at the time of such withdrawal, then the payroll deductions or other permitted form of contribution authorized by the
Participant and collected with respect to the Purchase Interval in which such withdrawal occurs shall be refunded to the Participant as soon as possible. 

(ii) The Participant’s withdrawal from the offering period shall be irrevocable, and the Participant
may not subsequently rejoin that offering period. In order to resume participation in any subsequent offering period, such individual must re-enroll in the Plan (by making a timely filing of the prescribed enrollment forms) on or before his or her
scheduled Entry Date into that offering period. 
 (iii) Should the Participant cease to remain
an Eligible Employee for any reason (including death, disability or change in status) while his or her purchase right remains outstanding, then that purchase right shall immediately terminate, and all of the Participant’s authorized payroll
deductions or other permitted contributions for the Purchase Interval in which the purchase right so terminates shall be immediately refunded. However, should the Participant cease to remain in active service by reason of an approved unpaid leave of
absence, then the Participant shall have the right, exercisable up until the last business day of the Purchase Interval in which such leave commences, to (a) withdraw all the payroll deductions or other permitted contributions authorized by the
Participant and collected to date on his or her behalf for that Purchase Interval or (b) have such funds held for the purchase of shares on his or her behalf on the next scheduled Purchase Date. In no event, however, shall any further payroll
deductions or other permitted form of contribution be collected on the Participant’s behalf during such leave. Upon the Participant’s return to active service (x) within three (3) months following the commencement of such leave
or (y) prior to the expiration of any longer period for which 

  
 8. 

 
such Participant is provided with reemployment rights by statute or contract, his or her authorized payroll deductions or other permitted form of contribution under the Plan shall automatically
resume at the rate in effect at the time the leave began, unless the Participant withdraws from the Plan prior to his or her return. An individual who returns to active employment following a leave of absence which exceeds in duration the applicable
(x) or (y) time period above will be treated as a new Employee for purposes of subsequent participation in the Plan and must accordingly re-enroll in the Plan (by making a timely filing of the prescribed enrollment forms) on or before his
or her scheduled Entry Date into the offering period. 
 H. Change in Control. Each outstanding
purchase right shall automatically be exercised, immediately prior to the effective date of any Change in Control, by applying the authorized payroll deductions or other permitted contributions of each Participant for the Purchase Interval in which
such Change in Control occurs to the purchase of whole shares of Common Stock at the purchase price per share in effect for that Purchase Internal pursuant to the Purchase Price provisions of Paragraph C of this Article VII. However, the applicable
limitation on the number of shares of Common Stock purchasable per Participant shall continue to apply to any such purchase, but not the limitation applicable to the maximum number of shares of Common Stock purchasable in total by all Participants.

 The Corporation shall use reasonable efforts to provide at least ten (10)-days prior written notice of the
occurrence of any Change in Control, and Participants shall, following the receipt of such notice, have the right to terminate their outstanding purchase rights prior to the effective date of the Change in Control. 

I. Proration of Purchase Rights. Should the total number of shares of Common Stock to be purchased pursuant
to outstanding purchase rights on any particular date exceed the number of shares then available for issuance under the Plan, the Plan Administrator shall make a pro-rata allocation of the available shares on a uniform and nondiscriminatory basis,
and the authorized payroll deductions or other permitted form of contribution of each Participant, to the extent in excess of the aggregate purchase price payable for the Common Stock pro-rated to such individual, shall be refunded. 

J. ESPP Broker Account. The shares purchased on behalf of each Participant in the United States
shall be deposited directly into a brokerage account which the Corporation shall establish for the Participant at a Corporation-designated brokerage firm. The account will be known as the ESPP Broker Account. Except as otherwise provided below, the
deposited shares may not be transferred (either electronically or in certificate form) from the ESPP Broker Account until the later of the following two periods: (i) the end of the two (2)-year period measured from the
Participant’s Entry Date into the offering period in which the shares were purchased and (ii) the end of the one (1)-year measured from the actual purchase date of those shares. Such limitation shall apply both to transfers to different
accounts with the same ESPP broker and to transfers to other brokerage firms. Any shares held for the required holding period may thereafter be transferred (either electronically or in certificate form) to other accounts or to other brokerage firms.

  
 9. 

 The foregoing procedures shall not in any way limit when the
Participant may sell his or her shares. Those procedures are designed solely to assure that any sale of shares prior to the satisfaction of the required holding period is made through the ESPP Broker Account. In addition, the Participant may
request a stock certificate or share transfer from his or her ESPP Broker Account prior to the satisfaction of the required holding period should the Participant wish to make a gift of any shares held in that account. However, shares may not be
transferred (either electronically or in certificate form) from the ESPP Broker Account for use as collateral for a loan, unless those shares have been held for the required holding period. 

The foregoing procedures shall apply to all shares purchased by each Participant in the United States, whether or not
that Participant continues in Employee status. 
 K. Assignability. The purchase right shall be
exercisable only by the Participant and shall not be assignable or transferable by the Participant. 
 L.
Stockholder Rights. A Participant shall have no stockholder rights with respect to the shares subject to his or her outstanding purchase right until the shares are purchased on the Participant’s behalf in accordance with the
provisions of the Plan and the Participant has become a holder of record of the purchased shares. 
  

	 	VIII. 	 ACCRUAL LIMITATIONS 

 A. No Participant shall be entitled to accrue rights to acquire Common Stock pursuant to any purchase right outstanding under the Plan if and to the extent such accrual, when aggregated with
(i) rights to purchase Common Stock accrued under any other purchase right granted under the Plan and (ii) similar rights accrued under other employee stock purchase plans (within the meaning of Code Section 423) of the Corporation or
any Corporate Affiliate, would otherwise permit such Participant to purchase more than Twenty-Five Thousand Dollars ($25,000.00) worth of stock of the Corporation or any Corporate Affiliate (determined on the basis of the Fair Market Value per share
on the date or dates such rights are granted) for each calendar year such rights are at any time outstanding. 

B. For purposes of applying such accrual limitations to the purchase rights granted under the Plan, the following
provisions shall be in effect: 
 (i) The right to acquire Common Stock under each outstanding
purchase right shall accrue in a series of installments on each successive Purchase Date during the offering period on which such right remains outstanding. 

(ii) No right to acquire Common Stock under any outstanding purchase right shall accrue to the extent the
Participant has already accrued in the same calendar year the right to acquire Common Stock under one or more other purchase rights at a rate equal to Twenty-Five Thousand Dollars ($25,000.00) worth of Common Stock (determined on the basis of the
Fair Market Value per share on the date or dates of grant) for each calendar year such rights were at any time outstanding. 

  
 10.

 C. If by reason of such accrual limitations, any purchase right of a
Participant does not accrue for a particular Purchase Interval, then the authorized payroll deductions or other permitted form of contribution which the Participant made during that Purchase Interval with respect to such purchase right shall be
promptly refunded. 
 D. In the event there is any conflict between the provisions of this Article VIII and one
or more provisions of the Plan or any instrument issued thereunder, the provisions of this Article VIII shall be controlling. 
  

	 	IX.	 EFFECTIVE DATE AND TERM OF THE PLAN 

A. The Plan shall become effective for the offering period commencing at the Effective Time; provided, however, that
(i) the Plan shall have been approved by the stockholders of the Corporation and (ii) no purchase rights granted under the Plan shall be exercised, and no shares of Common Stock shall be issued hereunder, until the Corporation shall have
complied with all applicable requirements of the 1933 Act (including the registration of the shares of Common Stock issuable under the Plan on a Form S-8 registration statement filed with the Securities and Exchange Commission), all applicable
listing requirements of any Stock Exchange (or the Nasdaq Stock Market, if applicable) on which the Common Stock is listed for trading and all other applicable requirements established by law or regulation. 

B. Unless sooner terminated by the Board, the Plan shall terminate upon the earliest of (i) the last business day in
April 2021, (ii) the date on which all shares available for issuance under the Plan shall have been sold pursuant to purchase rights exercised under the Plan or (iii) the date on which all purchase rights are exercised in connection with a
Change in Control. No further purchase rights shall be granted or exercised, and no further payroll deductions or other forms of contribution shall be collected, under the Plan following such termination. 

 

	 	X.	 AMENDMENT OF THE PLAN 

 A. The Board may alter or amend the Plan at any time to become effective as of the start date of the next offering period thereafter under the Plan. In addition, the Board may suspend or terminate the
Plan at any time to become effective immediately following the close of any subsequent Purchase Interval. 
 B.
In no event may the Board effect any of the following amendments or revisions to the Plan without the approval of the Corporation’s stockholders: (i) increase the number of shares of Common Stock issuable under the Plan, except for
permissible adjustments in the event of certain changes in the Corporation’s capitalization or (ii) modify the eligibility requirements for participation in the Plan. 

 

	 	XI.	 GENERAL PROVISIONS 

 A. All costs and expenses incurred in the administration of the Plan shall be paid by the Corporation; however, each Plan Participant shall bear all costs and expenses incurred by such individual in the
sale or other disposition of any shares purchased under the Plan. 

  
 11.

 B. Nothing in the Plan shall confer upon the Participant any right to
continue in the employ of the Corporation or any Corporate Affiliate for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Corporation (or any Corporate Affiliate employing such person) or of the
Participant, which rights are hereby expressly reserved by each, to terminate such person’s employment at any time for any reason, with or without cause. 
 C. The provisions of the Plan shall be governed by the laws of the State of California without resort to that State’s conflict-of-laws rules. 

  
 12.

 Schedule A 
 Corporations Participating in 
 the GCT Semiconductor, Inc. 2011

 Employee Stock Purchase Plan 
 As of the Effective Time 
 GCT SEMICONDUCTOR, INC. 

GCT RESEARCH, INC. 
 GCT ASIA PACIFIC, INC. 

 APPENDIX 

The following definitions shall be in effect under the Plan: 

A. Board shall mean the Corporation’s Board of Directors. 

B. Cash Earnings shall, unless otherwise specified by the Plan Administrator prior to the start of an
offering period, mean (i) the regular base salary paid to such Participant by one or more Participating Corporations during such individual’s period of participation in one or more offering periods under the Plan and (ii) any overtime
payments, bonuses, commissions, profit-sharing distributions and other incentive-type payments received during such period. Cash Earnings shall be calculated before deduction of (A) any income or employment tax or other withholdings or
(B) any contributions made by the Participant to any Code Section 401(k) salary deferral plan or Code Section 125 cafeteria benefit program now or hereafter established by the Corporation or any Corporate Affiliate. Cash Earnings
shall not include any contributions made on the Participant’s behalf by the Corporation or any Corporate Affiliate to any employee benefit or welfare plan now or hereafter established (other than Code Section 401(k) or Code
Section 125 contributions deducted from such Cash Earnings). 
 C. Change in Control shall
mean a change in ownership of the Corporation pursuant to any of the following transactions: 

(i) the closing of a merger, consolidation or other reorganization approved by the Corporation’s
stockholders in which a change in ownership or control of the Corporation is effected through the acquisition by any person or group of persons comprising a “group” within the meaning of Rule 13d-5(b)(1) of the 1934 Act (other than the
Corporation or a person that, prior to such transaction, directly or indirectly controls, is controlled by or is under common control with, the Corporation) of beneficial ownership (within the meaning of Rule 13d-3 of the 1934 Act) of securities
possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities (as measured in terms of the power to vote with respect to the election of Board members), 

(ii) the closing of a sale, transfer or other disposition of all or substantially all of the
Corporation’s assets, 
 (iii) the closing of any transaction or series of related
transactions pursuant to which any person or any group of persons comprising a “group” within the meaning of Rule 13d-5(b)(1) of the 1934 Act (other than the Corporation or a person that, prior to such transaction or series of related
transactions, directly or indirectly controls, is controlled by or is under common control with, the Corporation) acquires directly or indirectly (whether as a result of a single acquisition or by reason of one or more acquisitions within the twelve
(12)-month period ending with the most recent acquisition) beneficial ownership (within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the
Corporation’s securities (as measured in terms of the power to vote with respect to the election of Board members) outstanding immediately after the consummation of such transaction or series of related transactions, whether such transaction

  
 A-1.

 
involves a direct issuance from the Corporation or the acquisition of outstanding securities held by one or more of the Corporation’s existing stockholders, 

(iv) a merger, recapitalization, consolidation, or other transaction to which the Corporation is a party
or the sale, transfer or other disposition of all or substantially all of the Corporation’s assets if, in either case, the members of the Board immediately prior to consummation of the transaction do not, upon consummation of the transaction,
constitute at least a majority of the board of directors of the surviving entity or the entity acquiring the Corporation’s assets, as the case may be, or a parent thereof, or 

(v) a change in the composition of the Board over a period of thirty-six (36) consecutive months or
less such that a majority of the Board members ceases by reason of one or more contested elections for Board membership to be comprised of individuals who either (A) have been Board members continuously since the beginning of such period or
(B) have been elected or nominated for election as Board members during such period by at least a majority of the Board members described in clause (A) who were still in office at the time the Board approved such election or nomination.

 D. Code shall mean the Internal Revenue Code of 1986, as amended. 

E. Common Stock shall mean the Corporation’s common stock. 

F. Corporate Affiliate shall mean any parent or subsidiary corporation of the Corporation (as determined in
accordance with Code Section 424), whether now existing or subsequently established. 
 G.
Corporation shall mean GCT Semiconductor, Inc., a Delaware corporation, and any corporate successor to all or substantially all of the assets or voting stock of GCT Semiconductor, Inc. that shall assume the Plan. 

H. Effective Time shall mean the time at which the underwriting agreement for the initial public offering
of the Common Stock is executed and the price established for the Common Stock to be sold in such offering. Any Corporate Affiliate that becomes a Participating Corporation after such Effective Time shall have a subsequent Effective Time with
respect to its employee-Participants that ion determined in accordance with Section V.C of the Plan. 
 I.
Eligible Employee shall mean any person who is employed by a Participating Corporation on a basis under which he or she is regularly expected to render more than twenty (20) hours of service per week for more than five
(5) months per calendar year for earnings that are considered wages under Code Section 3401 (a); provided, however, that the Plan Administrator may, prior to the start of the applicable offering period, waive one or both of the twenty
(20) hour and five (5) month service requirements. 
 J. Entry Date shall mean the date
an Eligible Employee first commences participation in the offering period in effect under the Plan. The earliest Entry Date under the Plan shall be the Effective Time. 

  
 A-2.

 K. Fair Market Value per share of Common Stock on any relevant
date shall be the closing price per share of Common Stock at the close of regular trading hours (i.e., before after-hours trading begins) on the date in question on the Stock Exchange serving as the primary market for the Common Stock, as such price
is reported by the National Association of Securities Dealers (if primarily traded on the Nasdaq Global or Global Select Market) or as officially quoted in the composite tape of transactions on any other Stock Exchange on which the Common Stock is
then primarily traded. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation exists. 

L. 1933 Act shall mean the Securities Act of 1933, as amended. 

M. 1934 Act shall mean the Securities Exchange Act of 1934, as amended. 

N. Participant shall mean any Eligible Employee of a Participating Corporation who is actively
participating in the Plan. 
 O. Participating Corporation shall mean the Corporation and such
Corporate Affiliate or Affiliates as may be authorized, in accordance with Section V.C of the Plan, to extend the benefits of the Plan to their Eligible Employees. The Participating Corporations in the Plan as of the Effective Time are listed in
attached Schedule A. 
 P. Plan shall mean the GCT Semiconductor, Inc. 2011 Employee Stock
Purchase Plan, as set forth in this document. 
 Q. Plan Administrator shall mean the committee of
two (2) or more Board members appointed by the Board to administer the Plan. 
 R. Purchase
Date shall mean the last business day of each Purchase Interval. 
 S. Purchase Interval
shall mean each successive six (6)-month period within the offering period at the end of which there shall be purchased shares of Common Stock on behalf of each Participant; provided, however, that the Plan Administrator may, prior to the start of
the applicable offering period, designate a different duration for the Purchase Intervals within that offering period. 
 T. Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global or Global Select Market or the New York Stock Exchange. 

  
 A-3.

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