Document:

Amended and Restated Employment Offer Letter

 Exhibit 10.13 
 Chief Financial and Administrative Officer 
 June 2, 2011 

Gene W. Kulzer 
 3693 Silver Oak Place

 Danville, CA 94506 
 RE:
Employment offer; Employment Agreement (Amended) 
 Dear Gene: 
 On behalf of GCT Semiconductor, Inc. (“Company”), I am pleased to offer you full-time employment beginning June 3, 2011, subject to the following terms and conditions. 

In advance, I apologize for the formality and length of this letter. However, due to the importance of the subject matter, we wish to err on the side of
providing more information, rather than less, about the employment being offered to you. 
  

	1.	Position 

 You will be employed by
the Company in the regular exempt position of Chief Financial and Administrative Officer (“CFO”). In this position, you will report to the Chief Executive Officer (“CEO”) and you shall have such duties and responsibilities as are
customary for a CFO and as may be assigned by the CEO or the Board of Directors of the Company. 
 Although your regular place of employment
initially will be the Company’s San Jose, California, headquarter offices, your position will require travel from time-to-time elsewhere throughout the United States and internationally such as to our offices in Korea, Japan and China.

 As an employee of the Company, you will be expected to comply with the Company’s personnel and other policies including, but not limited
to, the Company’s policy prohibiting discrimination and unlawful harassment, insider trading, conflicts of interest and violation of applicable laws in the course of performing services to the Company. As an executive employee and officer of
the Company you will be expected to administer and enforce these policies, with support from Human Resources and the Company’s legal counsel. 
 As a full-time employee, the Company requires that you devote your full business time, attention, skills and efforts to the duties and responsibilities of your position. However, the Company will not
preclude you from providing services to others, so long as such services would not be to the benefit of a competitor of the Company and will not otherwise interfere with your ability to satisfactorily fulfill your duties and responsibilities to the
Company. If you wish to perform services (for any or no form of compensation) to any other person or business entity while employed by the Company, please contact and discuss your plans with the Chief Executive Officer in advance of providing such
services so that no problem later arises that could have been avoided from the outset. 

					
		  		  	 Mr. Gene Kulzer
 June 2,
2011
 Employment Agreement

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	2.	Cash Compensation 

Salary. As a full-time employee in the regular exempt position of CFO, you will earn weekly salary of $4,326.92 (equal to $225,000
annually), payable in accordance with the Company’s regular payroll schedule. Generally, your salary rate will be reviewed, and may be adjusted in the discretion of the Company, on an annual basis. 

Bonuses. In this position, you also will be eligible to earn a bonus annually with a targeted incentive rate of
25% of your base salary, beginning with fiscal year 2012 (fiscal year 2012 begins July 1, 2011). Whether to grant a bonus, and in what amount, are determinations to be made in the discretion of the Board based on a variety of factors including,
but not limited to, achievement of objectives established for the Company and for your position, and your overall job performance. In order to receive any bonus award, you must be employed through the end of the fiscal year and still be employed by
the Company at the time it makes bonus payments, generally during the first quarter of the following fiscal year no later than September 15th. 
  

	3.	Benefits 

 You shall be eligible to
participate in all of the employee benefits and benefit plans that the Company generally makes available to its full-time regular employees, subject to the terms and conditions of such benefits and benefit plans, subject to any statutory
requirements or limitations. These benefits include, but are not limited to, group health plans, life, disability and AD&D insurances, a 401k Retirement Savings Plan, and vacation/paid time off. 

However, you will accrue four weeks (20 days) paid vacation per year beginning with fiscal year 2012, but you may never have an
accrued balance in excess of five weeks (25 days) of vacation. Once you reach that maximum balance, you will cease accruing vacation until you use some of your balance thereby bringing it below the maximum allowed. You will be given the flexibility
to keep your family commitments for a week around the July 4th holiday and during the period of August 12-22, 2011. 
 You also will be eligible to
participate in any other benefits and benefits plans that the Company makes available from time-to-time to its executive level employees. Detailed information about the benefits presently available will be provided to you upon request or after you
accept this offer. 
 The Company shall also reimburse you for reasonable costs incurred for attending accredited continuing education courses
with respect to corporate governance, audit, accounting, tax, information technology and legal matters related to the responsibilities and functions of the Audit Committee. 

 

	4.	Equity (Amended) 

 It will be
recommended to the Board that you are granted a stock option to purchase up to 1,800,000 shares of the Company’s common stock (the “Option”) representing approximately 0.5% of the Company’s outstanding common stock shares fully
diluted at the time of the IPO. The per share exercise price of the Option will be equal to the fair market value of the common stock on the date the Board actually approves the option grant to you. The Option will be evidenced by a standard stock

					
		  		  	 Mr. Gene Kulzer
 June 2,
2011
 Employment Agreement

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option agreement, and will be subject to the terms and conditions of that agreement and the Company’s stock option plan under which the Option is granted. 

Such terms and conditions will include, but not be limited to a vesting schedule pursuant to which 25% of the Option shares will vest upon the first year
anniversary of the vesting commencement date and the remainder shall vest in 36 equal installments each month thereafter as you continue to actively provide services to the Company, with the vesting commencement date being the date you commence to
provide services as the Company’s CFO. You will have the opportunity to pre-purchase all Option shares prior to vesting, subject to the Company’s right of repurchase of all unvested shares, at the original exercise price, in the event that
your services as an employee of the Company cease before all Option shares have vested. 
 In addition, if your employment with the Company is
terminated without Cause or you resign from your employment for Good Reason, with either occurring within twelve months after a Change of Control, then the Company will accelerate the vesting of the Option such that 50% of the then unvested shares
will be immediately vested and exercisable as of your last day of employment. For the purposes of this special acceleration, the definitions relevant to the Severance Opportunity, below, shall not apply. Rather, the controlling definitions shall be
those contained in the stock option plan and agreement under which the Option is granted. 
  

	5.	“At Will” Employment 

Employment with the Company is “at-will”. This means that it is not for any specified period of time and can be terminated by you or by the
Company at any time, with or without advance notice, and for any or no particular reason or cause. It also means that your job duties, title, responsibilities, reporting level, work location, compensation and benefits, as well as the Company’s
personnel policies and procedures, may be changed at any time, with or without notice in the sole discretion of the Company. This “at-will” nature of your employment shall remain unchanged during your tenure as an employee, and can only be
changed by an express written agreement that is signed by you and by the Company’s Chief Executive Officer . 
  

	6.	Conditions of Offer 

 This offer,
and any employment pursuant to this offer, is conditioned upon the following: 
  

	 	•	 	 Your ability to provide satisfactory documentary proof of your identity and right to work in the United States of America on your first day of
employment. Enclosed is the INS Form I-9, Employment Eligibility Verification, the second page of which includes a description of acceptable documentary proof. 

 

	 	•	 	 Your signed agreement to, and ongoing compliance with, the terms of the enclosed Proprietary Information & Inventions Assignment Agreement
without modification (“PIIA”). 

  

	 	•	 	 Your return of the enclosed copy of this letter, after being signed by you without
modification,1 no later than June 2, 2011, after
which time this offer will expire. 

  
  

	1 	 Any agreed-upon modification will be in writing in a revised offer letter. 

					
		  		  	 Mr. Gene Kulzer
 June 2,
2011
 Employment Agreement

(Amended)
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	 	•	 	 The Company will provide no later than the start of the IPO road show or within 30 days of the filing of the S-1 an Indemnification Agreement for
execution. 

  

	 	•	 	 By signing and accepting this offer, you represent and warrant that: (i) you are not subject to any pre-existing contractual or other legal
obligation with any person, company or business enterprise that may be an impediment to your employment with, or your providing services to, the Company as its employee; (ii) you have not and shall not bring onto Company premises, or use in the
course of your employment with the Company, any confidential or proprietary information of another person, company or business enterprise to whom you previously provided services; and (iii) you are not relying on any representations, promises
or agreements not expressly contained in this letter. 

  

	7.	Severance Opportunity 

 Although your employment with the Company is “at-will,” if your employment as CFO is terminated by the Company without “Cause” (as defined below), a severance opportunity will be
available to you as described below. This severance opportunity will be subject to (i) a Severance & General Release Agreement, in a form provided by the Company and signed by you, that becomes effective and enforceable, which
would include non-disparagement and post-termination cooperation provisions (“SGRA”); and (ii) your continued compliance with the PIIA you signed in connection with accepting this offer. This severance opportunity will consist of the
following: 
  

	 	•	 	 Continued payment of your salary by the Company, subject only to tax withholdings and in accordance with the Company’s regular payroll schedule,
for a period of up to six (6) months after the effective date of the SGRA with the first such payment to be made on the first regular payroll date, within the 60-day period following such termination of employment, on which the SGRA is
effective; provided, however, that if such 60-day period spans two calendar years, the first such payment will not be made until the end of such 60-day period; and 

 

	 	•	 	 Company-paid COBRA premiums, on behalf of you and your eligible dependents, for continuation of your existing group health benefit plan coverage for a
period of up to six (6) calendar months after the effective date of the SGRA, provided that you timely elect COBRA continuation coverage. 

 The following definitions shall apply for the purposes of this severance opportunity only: 
 “Termination without Cause” shall mean the termination of your employment relationship by the Company for a reason other than “Cause,” excluding termination due to your death or
Disability. 
 “Cause” shall mean the Company’s termination of your employment for any of the following
reasons: 
 (i) your commission of any act of fraud, embezzlement or dishonesty; 

(ii) your violation of the PIIA; 
 (iii) any misconduct by you, whether by omission or commission, that has a materially adverse effect upon the Company’s business or affairs; 

					
		  		  	 Mr. Gene Kulzer
 June 2,
2011
 Employment Agreement

(Amended)
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 (iv) your continued failure to satisfactorily perform the duties and responsibilities of
your position during the thirty (30) days after your receipt of written notice from the Company identifying deficiencies in your job performance; or 
 (v) a material breach by you of any of your fiduciary obligations to the Company. 

“Disability” shall mean your medical inability to perform the essential functions of the CFO position, with or without
reasonable accommodation, for a continuous period of 90 days or for an aggregate period of 120 days over a 12 month period. 
  

	8.	Delayed Payments 

 Notwithstanding
the foregoing, if (i) the Company has at the time any class or series of stock publicly traded on an established securities market or otherwise and (ii) you are on your employment termination date a “specified employee,” as
determined in accordance with the provisions of Internal Revenue Code Section 409A (“Section 409A”) and the Treasury Regulations thereunder, then any payments or benefits to which you may become entitled under this letter agreement
that are subject to Section 409A shall be delayed to the extent necessary to avoid a prohibited distribution under Section 409A(a)(2)(B)(i) of the Internal Revenue Code. Any payments or benefits so delayed shall be subsequently paid or
distributed to you (or your estate) on the earlier of (i) the first day of the seventh month following your “separation from service” (as defined below) or (ii) the date of your death. On the earlier of such dates,
all payments or benefits deferred pursuant to this Section 9 will be paid or distributed to you (or your estate) in a lump sum payment. The remaining payments and benefits (if any) to which you are entitled under this letter agreement will be
paid or distributed as they become due and payable hereunder. 
 For purposes of this Section 9, “separation from service” means
your cessation of employment with the Company by reason of your death, resignation, dismissal or other termination event and will be deemed to occur at such time as the level of bona fide services you are to render as such an employee (or as a
non-employee consultant) permanently decreases to a level that is not more than twenty percent (20%) of the average level of services you rendered as an employee during the immediately preceding thirty-six (36) months. In determining
whether you have experienced a separation from service, the Company will apply the standards set forth in the Treasury Regulations issued under Section 409A. 
  

	9.	Section 409A Status 

 The
potential severance payments and benefits to which you may become entitled pursuant to this letter agreement are intended, where possible, to comply with the “short term deferral exception” and the “involuntary separation pay
exception” to Section 409A. Accordingly, the provisions applicable to your potential cash severance payment under Section 5 above and the determination of your separation from service due to a termination of your employment without
cause shall be applied, construed and administered so that such payment shall qualify for one or both of those exceptions, to the maximum extent allowable. However, to the 

					
		  		  	 Mr. Gene Kulzer
 June 2,
2011
 Employment Agreement

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extent any payment or benefit to which you become entitled under this letter agreement is deemed to constitute an item of deferred compensation subject to the requirements of Section 409A,
the provisions applicable to that payment or benefit shall be applied, construed and administered so that such payment or benefit is made or provided in compliance with the applicable requirements of Section 409A. In addition, to the extent
there is any ambiguity as to whether any provision of this agreement would otherwise contravene one or more requirements or limitations of Section 409A and the Treasury Regulations thereunder, such provision shall be interpreted, administered
and applied in a manner that complies with the applicable requirements (or an exception from the requirements) of Section 409A and the Treasury Regulations thereunder. 

 

	10.	Entire Agreement 

 If you accept
this offer, and the conditions of this offer are satisfied, this letter and the written agreements referenced in this letter (including, but not limited to, the PIIA) shall constitute the complete agreement between you and the Company with respect
to the initial terms and conditions of your employment (“Employment Agreement”). Any representations, promises or agreements, whether written or oral, not contained in or contrary to those contained in this Employment Agreement that may
have been made to you are expressly cancelled and replaced by this Employment Agreement. Except as otherwise specified in this Employment Agreement, the terms and conditions of your employment pursuant to this Employment Agreement may not be
changed, except by a express writing signed by the Company’s Chief Executive Officer or Chairman of the Board. The Company’s successors and assigns shall be bound by this Employment Agreement. 

We look forward to you accepting this offer and a mutually rewarding relationship. If you accept this offer, please date and sign below, on the enclosed
copy of this letter and return it to John Park at fax number (650) 843-4001, no later than the end of today. Please retain the original of this letter for your records. 

 

	
	Sincerely,
	
	/s/ Kyeong Ho Lee
	Kyeong Ho Lee
	President and Chief Executive Officer

  

			
	Encls.:	 	 Copy of letter

Proprietary Information & Inventions Assignment Agreement
 INS Form I-9, Employment Eligibility Verification

 I have read, I understand, and voluntarily accept the above offer: 

					
		  		  	 Mr. Gene Kulzer
 June 2,
2011
 Employment Agreement

(Amended)
  Page
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	Dated:                 , 2011	 		 	/s/ Gene Kulzer
		 		 	Gene KulzerEmployment Offer Letter

 Exhibit 10.14 
 April 8, 2002 
 Mr. Alex Sum 
 5629 Snowdon Place 
 San Jose, CA 95138 

PERSONAL & CONFIDENTIAL 
 Re: Employment with GCT Semiconductor, Inc. – Revised 
 Dear Mr. Sum,

 I am pleased to offer you a position with GCT Semiconductor, Inc. (“the Company” or “GCT”) pursuant to the
following terms and conditions: 
 1. Employment Duties. Your employment with the Company shall be in the position of
Executive Vice President of Product Marketing and Program Management, reporting to Kyeongho Lee, President & CEO of the Company. As an Executive VP of Product Marketing and Program Management, your responsibility will cover as follows;

  

	 	A.	Building up and managing GCT’s Product Marketing & Program Management group in both of US and Korea which is composed of RF, PAN, and LAN divisions

  

	 	B.	Continuously mining strategic partners fitting to GCT business and maintaining current existing business partners 

 

	 	C.	Support CEO to devise practical and business-oriented product/technology roadmap 

 More detailed job descriptions and communication channels will be discussed after the commencement of your employment with the Company. As an employee on a full-time basis, you are expected to devote your
full time, ability, attention, energy and skills solely and exclusively in performing all of your duties for the Company. 
 2. Start Date. If you accept this offer, your employment with the Company shall begin on May 6th 2002. 
 3. Salary. In consideration for your service to the Company, you shall receive a base salary of $150,000 per annum to be paid in equal installments once a month from which the Company shall
withhold and deduct all income, social security, disability, and other taxes required by applicable laws. 
 4. Stock
Options. In further consideration for your services, but subject to the approval of the Board of Directors of GCT, you will be granted options to purchase 200,000 shares of the GCT’s common stock pursuant to the terms and conditions of
GCT’s 1999 Stock Plan. A stock option agreement will be entered into between you and GCT, accordingly, within a reasonable time period after the commencement of your employment. The option exercise price will be equivalent to the fair market
value of the shares at the date grant as determined by the Board of Directors of GCT. The options will vest over 4 years from the date of grant. 

 5. Additional Benefits. The Company will provide you with any benefits that the
Company may, from time to time in its sole discretion, provide to all of its employees. These benefits will be explained to you in more detail upon the commencement of your employment with the Company. Such benefits will include 401(k) Plan, health
insurances (medical, dental, and vision), paid vacation, and sick leave time. You will also be entitled to reimbursement by the Company for customary, ordinary and necessary business expenses incurred by you in the performance of your duties and
activities associated with promoting and maintaining the business of the Company, but only if such expenses are approved in writing in advance by the Company and receipts for such reimbursement are received by the Company. 

6. Proprietary Rights and Confidentiality Agreement. As a condition of your employment with the Company, you are required to
execute and deliver to the Company the Company’s standard form of Proprietary Rights and Confidentiality Agreement, which will be incorporated into and made a part of this offer letter by this reference. The Proprietary Rights and
Confidentiality Agreement will be provided to you prior to or at the commencement of your employment with the Company. 
 7.
At Will Employment. Your employment with the Company is entirely voluntary for both parties and either you or the Company may conclude the employment relationship at any time with or without cause. In the event that the Company may conclude
the employment relationship within one year after the commencement of your employment due to the fundraising issue, however, the Company agrees to pay you the salary equivalent for three (3) months. This “at will” employment
relationship can only be modified in writing by an authorized officer of the Company. 
 8. Probationary Period. The
first three months of your employment with GCT will be deemed a probationary period during which you and GCT can assess the mutual desirability of continuing the employment relationship. 

 If you wish to accept this offer of employment with the Company, please sign in the space
provided below and deliver a copy of this letter with your original signature to the Company by no later than March 29, 2002. By so doing, you acknowledge that you have received no inducement or representations other than those set forth in
this letter which caused you to accept this offer of employment. 
  

			
	 Very truly yours,
  

GCT Semiconductor, Inc.

		
	By:	 	/s/ Kyeongho Lee
		 	 Kyeongho Lee

President & CEO

 OFFER AGREED TO AND ACCEPTED 
 I hereby accept this offer of regular, full-time employment with GCT Semiconductor, Inc. (the “Company”) in the position of Executive Vice President of Product Marketing & Program
Management, subject to all of the terms and conditions set forth in this offer letter. I understand that my employment with the Company may be voluntarily terminated by me or the Company at any time, is voluntarily entered into, and is for no
specified term. Correspondingly, I acknowledge that the foregoing offer letter does not in any way limit the right of the Company to terminate my “at will” employment at any time, for any reason or for no reason, with or without cause.

 I acknowledge and agree that this offer letter sets forth all of the terms and conditions of my employment with the Company,
and it supersedes any prior representations or agreements related thereto, whether written or oral. 
 Date: 4/17, 2002 

 

	
	Alex Sum
	
	/s/ Alex Sum
	Signature

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