Document:

Exhibit 10.1

 Exhibit 10.1 

RAMBUS INC. 
 2015 EQUITY INCENTIVE PLAN 
 (as amended March 8, 2018) 

1. Purposes of the Plan. The purposes of this Plan are: 

 

	 	•	 	 to attract and retain the best available personnel for positions of substantial responsibility, 

 

	 	•	 	 to provide incentives to individuals who perform services to the Company, and 

 

	 	•	 	 to promote the success of the Company’s business. 

 The Plan permits the grant of Incentive Stock Options, Nonstatutory Stock Options, Restricted Stock, Restricted Stock Units, Stock Appreciation Rights, Performance Units, Performance Shares and other
stock or cash awards as the Administrator may determine. 
 2. Definitions. As used herein, the following definitions
will apply: 
 (a) “Administrator” means the Board or any of its Committees that will be administering the Plan
in accordance with Section 4 of the Plan. 
 (b) “Applicable Laws” means the requirements relating to the
administration of equity-based awards under U.S. state corporate laws, U.S. federal and state securities laws, the Code, any stock exchange or quotation system on which the Common Stock is listed or quoted and the applicable laws of any foreign
country or jurisdiction where Awards are, or will be, granted under the Plan. 
 (c) “Award” means,
individually or collectively, a grant under the Plan of Options, Restricted Stock, Restricted Stock Units, Stock Appreciation Rights, Performance Units, Performance Shares and other stock or cash awards as the Administrator may determine.

 (d) “Award Agreement” means the written or electronic agreement setting forth the terms and provisions
applicable to each Award granted under the Plan. The Award Agreement is subject to the terms and conditions of the Plan. 
 (e)
“Board” means the Board of Directors of the Company. 
 (f) “Change in Control” means the
occurrence of any of the following events: 
 (i) A change in the ownership of the Company which occurs on the date that
any one person, or more than one person acting as a group (“Person”), acquires ownership of the stock of the Company that, together with the stock held by such Person, constitutes more than 50% of the total voting power of the
stock of the Company; provided, however, that for purposes of this subsection, the acquisition of additional stock by any one Person, who is considered to own more than 50% of the total voting power of the stock of the Company will not be
considered a Change in Control; provided, however, that for purposes of this clause (i), (1) the acquisition of beneficial ownership of additional stock by any one Person who is considered to beneficially own more than 50% of the total voting power
of the stock of the Company will not be considered a Change in Control; and (2) if the stockholders of the Company immediately before such change in ownership continue to retain immediately after the change in ownership, in substantially the
same proportions as their ownership of shares of the Company’s voting stock immediately prior to the change in ownership, direct or indirect beneficial ownership of 

  
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50% or more of the total voting power of the stock of the Company or of the ultimate parent entity of the Company, such event shall not be considered a Change in Control under this clause (i).
For this purpose, indirect beneficial ownership shall include, without limitation, an interest resulting from ownership of the voting securities of one or more corporations or other business entities which own the Company, as the case may be, either
directly or through one or more subsidiary corporations or other business entities; or 
 (ii) A change in the effective
control of the Company which occurs on the date that a majority of members of the Board is replaced during any twelve (12) month period by Directors whose appointment or election is not endorsed by a majority of the members of the Board prior
to the date of the appointment or election. For purposes of this clause (ii), if any Person is considered to be in effective control of the Company, the acquisition of additional control of the Company by the same Person will not be considered a
Change in Control; or 
 (iii) A change in the ownership of a substantial portion of the Company’s assets which occurs on
the date that any Person acquires (or has acquired during the twelve (12) month period ending on the date of the most recent acquisition by such person or persons) assets from the Company that have a total gross fair market value equal to
or more than 50% of the total gross fair market value of all of the assets of the Company immediately prior to such acquisition or acquisitions; provided, however, that for purposes of this subsection (iii), the following will not constitute a
change in the ownership of a substantial portion of the Company’s assets: (A) a transfer to an entity that is controlled by the Company’s stockholders immediately after the transfer, or (B) a transfer of assets by the Company to:
(1) a stockholder of the Company (immediately before the asset transfer) in exchange for or with respect to the Company’s stock, (2) an entity, 50% or more of the total value or voting power of which is owned, directly or
indirectly, by the Company, (3) a Person, that owns, directly or indirectly, 50% or more of the total value or voting power of all the outstanding stock of the Company, or (4) an entity, at least 50% of the total value or voting
power of which is owned, directly or indirectly, by a Person described in this subsection (iii)(B)(3). For purposes of this subsection (iii), gross fair market value means the value of the assets of the Company, or the value of the assets being
disposed of, determined without regard to any liabilities associated with such assets. 
 For purposes of this definition,
persons will be considered to be acting as a group if they are owners of a corporation that enters into a merger, consolidation, purchase or acquisition of stock, or similar business transaction with the Company. 

Notwithstanding the foregoing, a transaction will not be deemed a Change in Control unless the transaction qualifies as a change in
control event within the meaning of Code Section 409A, as it has been and may be amended from time to time, and any proposed or final Treasury Regulations and Internal Revenue Service guidance that has been promulgated or may be promulgated
thereunder from time to time. 
 Further and for the avoidance of doubt, a transaction will not constitute a Change in Control
if: (i) its sole purpose is to change the state of the Company’s incorporation, or (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the persons who held the
Company’s securities immediately before such transaction. 
 (g) “Code” means the Internal Revenue Code of
1986, as amended. Any reference to a section of the Code herein will be a reference to any successor or amended section of the Code. 
 (h) “Committee” means a committee of independent, Outside Directors appointed by the Board in accordance with Section 4 hereof. 

(i) “Common Stock” means the common stock of the Company. 

(j) “Company” means Rambus Inc., a Delaware corporation, or any successor thereto. 

  
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 (k) “Consultant” means any natural person, including an advisor,
engaged by the Company or a Parent or Subsidiary to render bona fide services to such entity, provided the services: (i) are not in connection with the offer or sale of securities in a capital-raising transaction, and (ii) do not directly
promote or maintain a market for the Company’s securities, in each case, within the meaning of Form S-8 promulgated under the Securities Act, and provided, further, that a Consultant will include only
those persons to whom the issuance of Shares may be registered under Form S-8 promulgated under the Securities Act. 
 (l) “Director” means a member of the Board. 
 (m)
“Disability” means total and permanent disability as defined in Section 22(e) (3) of the Code, provided that in the case of Awards other than Incentive Stock Options, the Administrator in its discretion may determine
whether a permanent and total disability exists in accordance with uniform and non-discriminatory standards adopted by the Administrator from time to time. 

(n) “Dividend Equivalent” means a credit, payable in cash or Shares, made at the discretion of the Administrator or as
otherwise provided by the Plan, to the account of a Participant in an amount equal to the cash dividends paid on one Share for each Share represented by an Award held by such Participant. Subject to the provisions of Section 6, Dividend
Equivalents may be subject to the same vesting restrictions as the related Shares subject to an Award, at the discretion of the Administrator. 
 (o) “Employee” means any person, including Officers and Directors, employed by the Company or any Parent or Subsidiary of the Company. Neither service as a Director nor payment of a
director’s fee by the Company will be sufficient to constitute “employment” by the Company. 
 (p)
“Exchange Act” means the Securities Exchange Act of 1934, as amended. 
 (q) “Exchange
Program” means a program under which (i) outstanding Awards are surrendered or cancelled in exchange for awards of the same type (which may have higher or lower exercise prices and different terms), awards of a different type, and/or
cash, (ii) Participants would have the opportunity to transfer any outstanding Awards to a financial institution or other person or entity selected by the Administrator, and/or (iii) the exercise price of an outstanding Award is increased
or reduced. The Administrator may not implement an Exchange Program. 
 (r) “Fair Market Value” means, as of
any date, the value of Common Stock as the Administrator may determine in good faith by reference to the price of such stock on any established stock exchange or a national market system on the day of determination if the Common Stock is so listed
on any established stock exchange or a national market system. If the Common Stock is not listed on any established stock exchange or a national market system, the value of the Common Stock as the Administrator may determine in good faith.

 (s) “Fiscal Year” means the fiscal year of the Company. 

(t) “Incentive Stock Option” means an Option that by its terms qualifies and is otherwise intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and the regulations promulgated thereunder. 
 (u)
“Inside Director” means a Director who is an Employee. 
 (v) “Nonstatutory Stock Option”
means an Option that by its terms does not qualify or is not intended to qualify as an Incentive Stock Option. 
 (w)
“Officer” means a person who is an officer of the Company within the meaning of Section 16 of the Exchange Act and the rules and regulations promulgated thereunder. 

  
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 (x) “Option” means a stock option granted pursuant to the Plan.

 (y) “Outside Director” means a Director who is not an Employee. 

(z) “Parent” means a “parent corporation,” whether now or hereafter existing, as defined in
Section 424(e) of the Code. 
 (aa) “Participant” means the holder of an outstanding Award. 

(bb) “Performance Period” means any Fiscal Year of the Company or such other period as determined by the Administrator
in its sole discretion. 
 (cc) “Performance Share” means an Award denominated in Shares which may be earned in
whole or in part upon attainment of performance objectives or other vesting criteria as the Administrator may determine pursuant to Section 11. 
 (dd) “Performance Unit” means an Award which may be earned in whole or in part upon attainment of performance objectives or other vesting criteria as the Administrator may determine and
which may be settled for cash, Shares or other securities or a combination of the foregoing pursuant to Section 11. 
 (ee)
“Period of Restriction” means the period during which the transfer of Shares of Restricted Stock are subject to restrictions and therefore, the Shares are subject to a substantial risk of forfeiture. Such restrictions may be based
on the passage of time, the achievement of target levels of performance, or the occurrence of other events as determined by the Administrator. 
 (ff) “Plan” means this 2015 Equity Incentive Plan. 
 (gg)
“Restricted Stock” means Shares issued pursuant to a Restricted Stock award under Section 8 of the Plan, or issued pursuant to the early exercise of an Option. 

(hh) “Restricted Stock Unit” means a bookkeeping entry representing an amount equal to the Fair Market Value of one
Share, granted pursuant to Section 9. Each Restricted Stock Unit represents an unfunded and unsecured obligation of the Company. 
 (ii) “Rule 16b-3” means Rule 16b-3 of the Exchange Act or any successor to Rule 16b-3, as in effect when discretion is being exercised with respect to the Plan. 
 (jj)
“Section 16(b)” means Section 16(b) of the Exchange Act. 
 (kk) “Service
Provider” means an Employee, Director or Consultant. 
 (ll) “Share” means a share of the Common
Stock, as adjusted in accordance with Section 16 of the Plan. 
 (mm) “Stock Appreciation Right” means an
Award, granted alone or in connection with an Option, that pursuant to Section 10 is designated as a Stock Appreciation Right. 
 (nn) “Subsidiary” means a “subsidiary corporation,” whether now or hereafter existing, as defined in Section 424(f) of the Code. 

  
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 (oo) “Successor Corporation” has the meaning given to such term in
Section 16(c) of the Plan. 
 3.
Stock Subject to the Plan. 
 (a) Stock
Subject to the Plan. Subject to the provisions of Section 16 of the Plan, the maximum aggregate number of Shares that may be awarded and sold under the Plan is 9,500,000 Shares, plus (i) 8,158,396, which represents the number of Shares
that remained available for grant under the Company’s 2006 Equity Incentive Plan (the “Existing Plan”) on the date this Plan became effective, plus (ii) the number of Shares that are subject to awards under the Existing
Plan that, on or after the date this Plan became effective, are forfeited, cancelled, exchanged or surrendered or terminate under the Existing Plan. The Shares may be authorized, but unissued, or reacquired Common Stock. In addition, no
more than 10,000,000 Shares may be granted pursuant to Options intended to qualify as Incentive Stock Options. 
 (b) Full
Value Awards. Any Shares subject to Awards granted with an exercise price less than the Fair Market Value on the date of grant of such Awards will be counted against the numerical limits of this Section 3 as 1.5 Shares for every one Share
subject thereto. Further, if Shares acquired pursuant to any such Award are forfeited or repurchased by the Company and would otherwise return to the Plan pursuant to Section 3(c), 1.5 times the number of Shares so forfeited or repurchased
will return to the Plan and will again become available for issuance. 
 (c) Lapsed Awards. If an Award expires or
becomes unexercisable without having been exercised in full, or, with respect to Restricted Stock, Restricted Stock Units, Performance Shares or Performance Units, is forfeited to or repurchased by the Company, the unpurchased Shares (or for Awards
other than Options and Stock Appreciation Rights, the forfeited or repurchased Shares) which were subject thereto will become available for future grant or sale under the Plan (unless the Plan has terminated). With respect to Stock Appreciation
Rights, all of the Shares covered by the Award (that is, Shares actually issued pursuant to a Stock Appreciation Right, as well as the Shares that represent payment of the exercise price) shall cease to be available under the Plan. However, Shares
that have actually been issued under the Plan under any Award will not be returned to the Plan and will not become available for future distribution under the Plan; provided, however, that if unvested Shares of Restricted Stock, Restricted Stock
Units, Performance Shares or Performance Units are repurchased by the Company or are forfeited to the Company, such Shares will become available for future grant under the Plan. Shares used to pay the tax and exercise price of an Award will not
become available for future grant or sale under the Plan. To the extent an Award under the Plan is paid out in cash rather than Shares, such cash payment will not result in reducing the number of Shares available for issuance under the Plan.
Notwithstanding the foregoing and, subject to adjustment provided in Section 16, the maximum number of Shares that may be issued upon the exercise of Incentive Stock Options shall equal the aggregate Share number stated in Section 3(a),
plus, to the extent allowable under Section 422 of the Code, any Shares that become available for issuance under the Plan under this Section 3(c). 
 (d) Share Reserve. The Company, during the term of this Plan, will at all times reserve and keep available such number of Shares as will be sufficient to satisfy the requirements of the Plan.

 4. Administration of the Plan. 
 (a) Procedure. 
 (i) General Administration; Multiple Administrative
Bodies. The Plan will be administered by a Committee or Committees as determined by the Board, which will be constituted to satisfy Applicable Laws. Different Committees with respect to different groups of Service Providers may administer the
Plan. 
 (ii) Rule 16b-3. To the extent desirable to qualify transactions
hereunder as exempt under Rule 16b-3, the transactions contemplated hereunder will be structured to satisfy the requirements for exemption under Rule 16b-3.

  
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 (iii) Delegation of Authority for Day-to-Day Administration. Except to the extent prohibited by Applicable Law, the Administrator may delegate to one or more individuals the
day-to-day administration of the Plan and any of the functions assigned to it in this Plan. Such delegation may be revoked at any time. 

(b) Powers of the Administrator. Subject to the provisions of the Plan, and in the case of a Committee, subject to the specific
duties delegated by the Board to such Committee, the Administrator will have the authority, in its discretion: 
 (i) to
determine the Fair Market Value; 
 (ii) to select the Service Providers to whom Awards may be granted hereunder; 

(iii) to determine the number of Shares to be covered by each Award granted hereunder; 

(iv) to approve forms of Award Agreements for use under the Plan; 

(v) to determine the terms and conditions, not inconsistent with the terms of the Plan, of any Award granted hereunder. Such terms and
conditions include, but are not limited to, the exercise price, the time or times when Awards may be exercised (which may be based on performance criteria), any vesting acceleration or waiver of forfeiture restrictions, and any restriction or
limitation regarding any Award or the Shares relating thereto, based in each case on such factors as the Administrator will determine; 
 (vi) to construe and interpret the terms of the Plan and Awards granted pursuant to the Plan; 
 (vii) to prescribe, amend and rescind rules and regulations relating to the Plan, including rules and regulations relating to sub-plans established for the purpose
of satisfying applicable foreign laws or for qualifying for favorable tax treatment under applicable foreign laws; 
 (viii) to
modify or amend each Award (subject to Section 6 and Section 21(c) of the Plan), including but not limited to the discretionary authority to extend the post-termination exercisability period of Awards and to extend the maximum term of an
Option (subject to Section 6(a)(ii) of the Plan regarding Incentive Stock Options); 
 (ix) to allow Participants to
satisfy tax withholding obligations in such manner as prescribed in Section 17 of the Plan; 
 (x) to authorize any person
to execute on behalf of the Company any instrument required to effect the grant of an Award previously granted by the Administrator; 
 (xi) to determine whether Awards (other than Options or SARs) will be adjusted for Dividend Equivalents; 
 (xii) to allow a Participant to defer the receipt of the payment of cash or the delivery of Shares that would otherwise be due to such Participant under an Award pursuant to such procedures as the
Administrator may determine; 
 (xiii) to impose such restrictions, conditions or limitations as it determines appropriate as
to the timing and manner of any resales by a Participant or other subsequent transfers by the Participant of any Shares issued as a result of or under an Award, including without limitation, (A) restrictions under an insider trading policy, and
(B) restrictions as to the use of a specified brokerage firm for such resales or other transfers; 

  
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 (xiv) to require that the Participant’s rights, payments and benefits with
respect to an Award (including amounts received upon the settlement or exercise of an Award) will be subject to reduction, cancellation, forfeiture or recoupment upon the occurrence of certain specified events, in addition to any otherwise
applicable vesting or performance conditions of an Award, as may be specified in an Award Agreement at the time of the Award, or later if (A) Applicable Laws require the Company to adopt a policy requiring such reduction, cancellation,
forfeiture or recoupment, or (B) pursuant to an amendment of an outstanding Award; and 
 (xv) to make all other
determinations deemed necessary or advisable for administering the Plan. 
 (c) Effect of
Administrator’s Decision. The Administrator’s decisions, determinations and interpretations will be final and binding on all Participants and any other holders of Awards. 

5. Eligibility. Nonstatutory Stock Options, Restricted Stock, Restricted Stock Units, Stock Appreciation Rights, Performance
Units, Performance Shares and such other cash or stock awards as the Administrator determines may be granted to Service Providers. Incentive Stock Options may be granted only to Employees. 

6. Limitations.  
 (a) Incentive Stock Options. 
 (i) $100,000 Limitation.
Notwithstanding any designation of an Option as an Incentive Stock Option, to the extent that the aggregate Fair Market Value of the Shares with respect to which Incentive Stock Options are exercisable for the first time by the Participant during
any calendar year (under all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such Options will be treated as Nonstatutory Stock Options. For purposes of this Section 6(a)(i), Incentive Stock Options will be taken into
account in the order in which they were granted. The Fair Market Value of the Shares will be determined as of the time the Option with respect to such Shares is granted. 
 (ii) Maximum Option Term. In the case of an Incentive Stock Option granted to a Participant who, at the time the Incentive Stock Option is granted, owns stock representing more than ten percent
(10%) of the total combined voting power of all classes of stock of the Company or any Parent or Subsidiary, the term of the Incentive Stock Option will be five (5) years from the date of grant or such shorter term as may be provided in the
Award Agreement. 
 (iii) Option Exercise Price. In the case of an Incentive Stock Option granted to an Employee who, at
the time the Incentive Stock Option is granted, owns stock representing more than ten percent (10%) of the voting power of all classes of stock of the Company or any Parent or Subsidiary, the per Share exercise price will be no less than 110% of the
Fair Market Value per Share on the date of grant. 
 (b) Share Limitations. Subject to Section 16, the following
limitations shall apply to Awards under the Plan: 
 (i) Options. During any Fiscal Year, no Participant will be granted
Options covering more than 1,000,000 Shares; provided, however, that in connection with a Participant’s initial service as an Employee, an Employee may be granted Options covering up to an additional 1,000,000 Shares; 

(ii) Restricted Stock. During any Fiscal Year, no Participant will receive more than an aggregate of 300,000 Shares of Restricted
Stock; provided, however, that in connection with a Participant’s initial service as an Employee, an Employee may be granted an aggregate of up to an additional 300,000 Shares of Restricted Stock; 

 

  
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 (iii) Restricted Stock Units. During any Fiscal Year, no Participant will
receive more than an aggregate of 300,000 Restricted Stock Units; provided, however, that in connection with a Participant’s initial service as an Employee, an Employee may be granted an aggregate of up to an additional 300,000 Restricted Stock
Units; 
 (iv) Stock Appreciation Rights. During any Fiscal Year, no Participant will be granted Stock Appreciation
Rights covering more than 1,000,000 Shares; provided, however, that in connection with a Participant’s initial service as an Employee, an Employee may be granted Stock Appreciation Rights covering up to an additional 1,000,000 Shares; and

 (v) Performance Units / Performance Shares. During any Fiscal Year, no Participant will receive (1) Performance
Units having an initial value greater than $3,000,000, and (2) more than 300,000 Performance Shares; provided, however, that in connection with a Participant’s initial service as an Employee, an Employee may be granted up to an additional
300,000 Performance Shares. 
 (c) Exchange Program. The Administrator may not institute an Exchange Program. 

(d) Outside Director Limitations. No Outside Director may be granted, in any Fiscal Year, Awards with a grant date fair value
(determined in accordance with U.S. generally accepted accounting principles) of greater than $300,000, increased to $500,000 in the Fiscal Year of his or her initial service as an Outside Director. Any Awards granted to an individual while he or
she was an Employee, or while he or she was a Consultant but not an Outside Director, will not count for purposes of the limitations under this Section 6. 
 (e) Vesting Limits. Awards granted under the Plan shall vest no earlier than the one (1) year anniversary of the Award’s date of grant, provided that the Administrator, in its sole
discretion, may provide an Award may accelerate vesting by reason of the Participant’s death, Disability or retirement, or upon a major capital change of the Company (including without limitation upon the occurrence of a Change in Control,
merger of the Company with or into another corporation or entity, or similar transaction), and provided further, that, notwithstanding the foregoing in this sentence, Awards that result in the issuance of an aggregate of up to 5% of the
Shares reserved for issuance under Section 3(a) may be granted to Service Providers, or outstanding Awards modified, without regard to such minimum vesting, exercisability and distribution provisions. 

(f) Dividend Payments. Dividends and other distributions payable with respect to Shares subject to Awards (including Dividend
Equivalents) will not be paid before the underlying Shares vest. 
 7. Stock Options. 

(a) Grant of Options. Subject to the terms and conditions of the Plan, Options may be granted to Service Providers at any time and
from time to time as will be determined by the Administrator, in its sole discretion. Each Option will be designated in the Award Agreement as either an Incentive Stock Option or a Nonstatutory Stock Option. 

(b) Number of Shares. Subject to the limitations contained in Section 6, the Administrator will have complete discretion to
determine the number of Shares subject to Options granted to any Participant. 
 (c) Term of Option. The Administrator
will determine the term of each Option in its sole discretion; provided, however, that the term will be no more than ten (10) years from the date of grant thereof, subject to the provisions of Section 6. 

(d) Option Exercise Price and Consideration. 
 (i) Exercise Price. The per share exercise price for the Shares to be issued pursuant to exercise of an Option will be determined by the Administrator, but will be no less than 100% of the Fair
Market Value per Share on the date of grant, subject to the provisions of Section 6. 

  
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 (ii) Waiting Period and Exercise Dates. At the time an Option is granted, the
Administrator will fix the period within which the Option may be exercised and will determine any conditions that must be satisfied before the Option may be exercised. 
 (iii) Form of Consideration. The Administrator will determine the acceptable form(s) of consideration for exercising an Option, including the method of payment, to the extent permitted by
Applicable Laws. 
 (e) Exercise of Option. 
 (i) Procedure for Exercise; Rights as a Stockholder. Any Option granted hereunder will be exercisable according to the terms of the Plan and at such times and under such conditions as determined by
the Administrator and set forth in the Award Agreement. An Option may not be exercised for a fraction of a Share. 
 An Option
will be deemed exercised when the Company receives: (i) notice of exercise (in such form as the Administrator may specify from time to time) from the person entitled to exercise the Option, and (ii) full payment for the Shares with respect
to which the Option is exercised (together with an applicable withholding taxes). No adjustment will be made for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Section 16 of
the Plan. 
 (ii) Termination of Relationship as a Service Provider. If a Participant ceases to be a Service Provider,
other than upon the Participant’s death or Disability, the Participant may exercise his or her Option within such period of time as is specified in the Award Agreement to the extent that the Option is vested on the date of termination (but in
no event later than the expiration of the term of such Option as set forth in the Award Agreement). In the absence of a specified time in the Award Agreement, the Option will remain exercisable for three (3) months following the
Participant’s termination. Unless otherwise provided by the Administrator, if on the date of termination the Participant is not vested as to his or her entire Option, the Shares covered by the unvested portion of the Option will revert to the
Plan. If after termination the Participant does not exercise his or her Option within the time specified by the Administrator, the Option will terminate, and the Shares covered by such Option will revert to the Plan. 

(iii) Disability of Participant. If a Participant ceases to be a Service Provider as a result of the Participant’s
Disability, the Participant may exercise his or her Option within such period of time as is specified in the Award Agreement to the extent the Option is vested on the date of termination (but in no event later than the expiration of the term of such
Option as set forth in the Award Agreement). In the absence of a specified time in the Award Agreement, the Option will remain exercisable for twelve (12) months following the Participant’s termination. Unless otherwise provided by the
Administrator, if on the date of termination the Participant is not vested as to his or her entire Option, the Shares covered by the unvested portion of the Option will revert to the Plan. If after termination the Participant does not exercise his
or her Option within the time specified herein, the Option will terminate, and the Shares covered by such Option will revert to the Plan. 
 (iv) Death of Participant. If a Participant dies while a Service Provider, the Option may be exercised following the Participant’s death within such period of time as is specified in the Award
Agreement to the extent that the Option is vested on the date of death (but in no event may the option be exercised later than the expiration of the term of such Option as set forth in the Award Agreement), by the Participant’s designated
beneficiary, provided such beneficiary has been designated prior to Participant’s death in a form acceptable to the Administrator. If no such beneficiary has been designated by the Participant, then such Option may be exercised by the personal
representative of the Participant’s estate or by the person(s) to whom the Option is transferred pursuant to the Participant’s will or in accordance with the laws of descent and distribution. In the absence of a specified time in the Award
Agreement, the Option will remain exercisable for twelve (12) months following Participant’s death. Unless otherwise provided by the Administrator, if at the time of death Participant is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option will immediately revert to the Plan. If the Option is not so exercised within the time specified herein, the Option will terminate, and the Shares covered by such Option will revert to the Plan.

  
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 8. Restricted Stock. 

(a) Grant of Restricted Stock. Subject to the terms and provisions of the Plan, the Administrator, at any time and from time to
time, may grant Shares of Restricted Stock to Service Providers in such amounts as the Administrator, in its sole discretion, will determine. 
 (b) Restricted Stock Agreement. Subject to the limitations contained in Section 6, each Award of Restricted Stock will be evidenced by an Award Agreement that will specify the Period of
Restriction (if any), the number of Shares granted, and such other terms and conditions as the Administrator, in its sole discretion, will determine. Unless the Administrator determines otherwise, Shares of Restricted Stock will be held by the
Company as escrow agent until the restrictions on such Shares have lapsed. 
 (c) Transferability. Except as provided in
this Section 8, Shares of Restricted Stock may not be sold, transferred, pledged, assigned, or otherwise alienated or hypothecated until the end of the applicable Period of Restriction. 

(d) Other Restrictions. The Administrator, in its sole discretion, may impose such other restrictions on Shares of Restricted
Stock as it may deem advisable or appropriate. 
 (e) Removal of Restrictions. Except as otherwise provided in this
Section 8, Shares of Restricted Stock covered by each Restricted Stock grant made under the Plan will be released from escrow as soon as practicable after the last day of the Period of Restriction. Subject to the vesting limitations contained
in Section 6, the Administrator, in its discretion, may accelerate the time at which any restrictions will lapse or be removed. 
 (f) Voting Rights. During the Period of Restriction, Service Providers holding Shares of Restricted Stock granted hereunder may exercise full voting rights with respect to those Shares, unless the
Administrator determines otherwise. 
 (g) Dividends and Other Distributions. During the Period of Restriction, Service
Providers holding Shares of Restricted Stock will be entitled to receive all dividends and other distributions paid with respect to such Shares unless otherwise provided in the Award Agreement. If any such dividends or distributions are paid in
Shares, the Shares will be subject to the same restrictions on transferability and forfeitability as the Shares of Restricted Stock with respect to which they were paid. 
 (h) Return of Restricted Stock to Company. On the date set forth in the Award Agreement, the Restricted Stock for which restrictions have not lapsed will revert to the Company and again will become
available for grant under the Plan. 
 9. Restricted Stock Units. 

(a) Grant. Restricted Stock Units may be granted at any time and from time to time as determined by the Administrator. Subject to
the limitations contained in Section 6, each Restricted Stock Unit grant will be evidenced by an Award Agreement that will specify such other terms and conditions as the Administrator, in its sole discretion, will determine, including all
terms, conditions, and restrictions related to the grant, the number of Restricted Stock Units and the form of payout, which, subject to Section 9(d), may be left to the discretion of the Administrator. 

(b) Vesting Criteria and Other Terms. The Administrator will set vesting criteria in its discretion, which, depending on the
extent to which the criteria are met, will determine the number of Restricted Stock Units that will be paid out to the Participant. Each Award of Restricted Stock Units will be evidenced by an Award Agreement that will specify the vesting criteria,
and such other terms and conditions as the Administrator, in its sole discretion, will determine. 

  
 10 

 (c) Earning Restricted Stock Units. Upon meeting the applicable vesting
criteria, the Participant will be entitled to receive a payout as specified in the Award Agreement. The Administrator may set vesting criteria based upon the achievement of Company-wide, divisional, business unit, or individual goals (including, but
not limited to, continued employment or service), applicable federal or state securities laws or any other basis determined by the Administrator in its discretion. Subject to the vesting limitations contained in Section 6, after the grant of
Restricted Stock Units, the Administrator, in its sole discretion, may reduce or waive any vesting criteria that must be met to receive a payout. 
 (d) Form and Timing of Payment. Payment of earned Restricted Stock Units will be made as soon as practicable after the date(s) set forth in the Award Agreement. The Administrator, in its sole
discretion, may pay earned Restricted Stock Units in cash, Shares, or a combination thereof. Shares represented by Restricted Stock Units that are fully paid in cash again will be available for grant under the Plan. 

(e) Cancellation. On the date set forth in the Award Agreement, all unearned Restricted Stock Units will be forfeited to the
Company. 
 10. Stock Appreciation Rights. 
 (a) Grant of Stock Appreciation Rights. Subject to the terms and conditions of the Plan, a Stock Appreciation Right may be granted to Service Providers at any time and from time to time as will be
determined by the Administrator, in its sole discretion. 
 (b) Number of Shares. Subject to the limitations contained in
Section 6, the Administrator will have complete discretion to determine the number of Stock Appreciation Rights granted to any Participant. 
 (c) Exercise Price and Other Terms. The Administrator, subject to the provisions of the Plan, will have complete discretion to determine the terms and conditions of Stock Appreciation Rights
granted under the Plan, provided, however, that the exercise price will be not less than one hundred percent (100%) of the Fair Market Value of a Share on the date of grant. 
 (d) Stock Appreciation Right Agreement. Each Stock Appreciation Right grant will be evidenced by an Award Agreement that will specify the exercise price, the term of the Stock Appreciation Right,
the conditions of exercise, and such other terms and conditions as the Administrator, in its sole discretion, will determine. 

(e) Expiration of Stock Appreciation Rights. A Stock Appreciation Right granted under the Plan will expire upon the date
determined by the Administrator, in its sole discretion, and set forth in the Award Agreement; provided, however, that the term will be no more than ten (10) years from the date of grant thereof. Notwithstanding the foregoing, the rules of
Section 7(e) also will apply to Stock Appreciation Rights. 
 (f) Payment of Stock Appreciation Right Amount. Upon
exercise of a Stock Appreciation Right, a Participant will be entitled to receive payment from the Company in an amount determined by multiplying: 
 (i) The difference between the Fair Market Value of a Share on the date of exercise over the exercise price; times 
 (ii) The number of Shares with respect to which the Stock Appreciation Right is exercised. 
 At
the discretion of the Administrator, the payment upon Stock Appreciation Right exercise may be in cash, in Shares of equivalent value, or in some combination thereof. 
 11. Performance Units and Performance Shares. 
 (a) Grant of Performance
Units/Shares. Performance Units and Performance Shares may be granted to Service Providers at any time and from time to time, as will be determined by the Administrator, in its sole discretion. Subject to the limitations contained in
Section 6, the Administrator will have complete discretion in determining the number of Performance Units/Shares granted to each Participant. 

  
 11 

 (b) Value of Performance Units/Shares. Each Performance Unit will have an
initial value that is established by the Administrator on or before the date of grant. Each Performance Share will have an initial value equal to the Fair Market Value of a Share on the date of grant. 

(c) Performance Objectives and Other Terms. The Administrator will set performance objectives or other vesting provisions
(including, without limitation, continued status as a Service Provider) in its discretion which, depending on the extent to which they are met, will determine the number or value of Performance Units/Shares that will be paid out to the Participant.
Each Award of Performance Units/Shares will be evidenced by an Award Agreement that will specify the Performance Period, and such other terms and conditions as the Administrator, in its sole discretion, will determine. The Administrator may set
performance objectives based upon the achievement of Company-wide, divisional, business unit or individual goals (including, but not limited to, continued employment or service), applicable federal or state securities laws, or any other basis
determined by the Administrator in its discretion. 
 (d) Earning of Performance Units/Shares. After the applicable
Performance Period has ended, the holder of Performance Units/Shares will be entitled to receive a payout of the number of Performance Units/Shares earned by the Participant over the Performance Period, to be determined as a function of the extent
to which the corresponding performance objectives or other vesting provisions have been achieved. Subject to the vesting limitations contained in Section 6, after the grant of a Performance Unit/Share, the Administrator, in its sole discretion,
may reduce or waive any performance objectives or other vesting provisions for such Performance Unit/Share. 
 (e) Form and
Timing of Payment of Performance Units/Shares. Payment of earned Performance Units/Shares will be made as soon as practicable after the expiration of the applicable Performance Period. The Administrator, in its sole discretion, may pay earned
Performance Units/Shares in the form of cash, in Shares (which have an aggregate Fair Market Value equal to the value of the earned Performance Units/Shares at the close of the applicable Performance Period) or in a combination thereof. 

(f) Cancellation of Performance Units/Shares. On the date set forth in the Award Agreement, all unearned or unvested Performance
Units/Shares will be forfeited to the Company, and again will be available for grant under the Plan. 
 12. Dividend
Equivalents. The Administrator, in its discretion, may provide in the Award Agreement evidencing any Award that the Participant will be entitled to receive Dividend Equivalents with respect to the payment of cash dividends on Shares having a
record date prior to the date on which the Awards are settled or forfeited. Subject to the limitations contained in Section 6, the Dividend Equivalents, if any, will be credited to an Award in such manner and subject to such terms and
conditions as determined by the Administrator in its sole discretion. In the event of a dividend or distribution paid in Shares or any other adjustment made upon a change in the capital structure of the Company as described in Section 16,
appropriate adjustments will be made to the Participant’s Award of Performance Units so that it represents the right to receive upon settlement any and all new, substituted or additional securities or other property (other than normal cash
dividends) to which the Participant would be entitled by reason of the consideration issuable upon settlement of the Award, and all such new, substituted or additional securities or other property will be immediately subject to the same vesting and
settlement conditions as are applicable to the Award. Dividend Equivalents will be subject to the Fiscal Year limits applicable to the underlying Restricted Stock Unit, Performance Share or Performance Unit Award as set forth in Section 6, as
applicable, hereof. 
 13. [RESERVED] 

14. Leaves of Absence. Unless the Administrator provides otherwise, or except as otherwise required by
Applicable Laws, vesting of Awards granted hereunder will be suspended starting on the 30th consecutive day of any unpaid leave of absence approved by the Company, with such suspension of vesting terminating upon the 

  
 12 

 
Participant’s resumption of service with the Company. A Service Provider will not cease to be an Employee in the case of (i) any leave of absence approved by the Company or
(ii) transfers between locations of the Company or between the Company, its Parent, or any Subsidiary. For purposes of Incentive Stock Options, no such leave may exceed three (3) months, unless reemployment upon expiration of such leave is
guaranteed by statute or contract. If reemployment upon expiration of a leave of absence approved by the Company is not so guaranteed, then six (6) months following the first (1st) day of such leave any Incentive Stock Option held by the Participant will cease to be treated as an Incentive Stock
Option and will be treated for tax purposes as a Nonstatutory Stock Option. 
 15. Transferability of Awards. Unless
determined otherwise by the Administrator, an Award may not be sold, pledged, assigned, hypothecated, transferred, or disposed of in any manner other than by will or by the laws of descent or distribution and may be exercised, during the lifetime of
the Participant, only by the Participant. If the Administrator makes an Award transferable, such Award will contain such additional terms and conditions as the Administrator deems appropriate. 

16. Adjustments; Dissolution or Liquidation; Merger or Change in Control. 

(a) Adjustments. In the event that any dividend or other distribution (whether in the form of cash, Shares, other securities, or
other property), recapitalization, stock split, reverse stock split, reorganization, merger, consolidation, split-up, spin-off, combination, repurchase, or exchange of
Shares or other securities of the Company, or other change in the corporate structure of the Company affecting the Shares occurs, the Administrator, in order to prevent diminution or enlargement of the benefits or potential benefits intended to be
made available under the Plan, will adjust the number and class of Shares that may be delivered under the Plan and/or the number, class, and price of Shares covered by each outstanding Award, and the numerical Share limits set forth in
Sections 3 and 6. 
 (b) Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of the
Company, the Administrator will notify each Participant as soon as practicable prior to the effective date of such proposed transaction. To the extent it has not been previously exercised, an Award will terminate immediately prior to the
consummation of such proposed action. 
 (c) Change in Control. 

(i) In the event of a Change in Control, subject to Section 16(c)(ii) and any vesting acceleration provisions in an Award or other
agreement, outstanding Awards shall be treated in the manner provided in the agreement relating to the Change in Control (including as the same may be amended), including, without limitation: 

(1) the continuation of the outstanding Award by the Company, if the Company is a surviving corporation; 

(2) the assumption of the outstanding Awards, or substitution of equivalent Awards, by the acquiring or succeeding corporation (or an
affiliate thereof) (the “Successor Corporation”) with appropriate adjustments as to the number and kind of shares and prices; 
 (3) that outstanding Awards will vest and become exercisable (and for the avoidance of doubt, notwithstanding the vesting limitations in Section 6), realizable, or payable, or restrictions applicable
to an Award will lapse, in whole or in part prior to or upon consummation of such Change in Control, and, to the extent the Administrator determines, terminate upon or immediately prior to the effectiveness of such merger or Change in Control;

 (4) (A) the termination of an Award in exchange for an amount of cash and/or property, if any, equal to the amount that
would have been attained upon the exercise of such Award or realization of the Participant’s rights as of the date of the occurrence of the transaction (and, for the avoidance of doubt, if as of the date of the occurrence of the transaction the
Administrator determines in good faith that no amount would have 

  
 13 

 
been attained upon the exercise of such Award or realization of the Participant’s rights, then such Award may be terminated by the Company without payment), or (B) the replacement of
such Award with other rights or property selected by the Administrator in its sole discretion; or 
 (5) any combination of the
foregoing. 
 Such agreement shall not be required to treat all Awards or individual types of Awards similarly in the Change in
Control. 
 (ii) In the event that the Successor Corporation refuses to assume, continue or substitute for the Award (and for
the avoidance of doubt, notwithstanding the vesting limitations in Section 6), the Participant will fully vest in and have the right to exercise all of his or her outstanding Options and Stock Appreciation Rights, including Shares as to which
such Awards would not otherwise be vested or exercisable, all restrictions on Restricted Stock and Restricted Stock Units will lapse, and, with respect to Awards with performance-based vesting, all performance goals will be deemed achieved at target
levels as to a prorated portion of such Award based on the portion of the applicable performance period that has lapsed through the date of the merger or Change in Control, and all other vesting criteria will be deemed achieved as to such prorated
portion of such Award. In addition, if an Option or Stock Appreciation Right is not assumed or substituted for in the event of a Change in Control, the Administrator will notify the Participant in writing or electronically that the Option or Stock
Appreciation Right will be fully vested and exercisable for a period of time determined by the Administrator in its sole discretion, and the Option or Stock Appreciation Right will terminate upon the expiration of such period. 

With respect to Awards granted to Outside Directors that are assumed or substituted for, if on the date of or following such assumption
or substitution the Participant’s status as a Director or a director of the Successor Corporation, as applicable, is terminated other than upon a voluntary resignation by the Participant, then the Participant will fully vest in and have the
right to exercise Options and/or Stock Appreciation Rights as to all of the Shares subject thereto, including Shares as to which such Awards would not otherwise be vested or exercisable, all restrictions on Restricted Stock and Restricted Stock
Units will lapse, and, with respect to Awards with performance-based vesting, all performance goals will be deemed achieved at target levels as to a prorated portion of such Award based on the portion of the applicable performance period that has
lapsed through the date of the merger or Change in Control, and all other vesting criteria will be deemed achieved as to such prorated portion of such Award. 
 For the purposes of this subsection (c), an Award will be considered assumed if, following the Change in Control, the Award confers the right to purchase or receive, for each Share subject to the Award
immediately prior to the Change in Control, the consideration (whether stock, cash, or other securities or property) or, in the case of a Stock Appreciation Right upon the exercise of which the Administrator determines to pay cash or a Performance
Share or Performance Unit which the Administrator can determine to pay in cash, the fair market value of the consideration received in the merger or Change in Control by holders of Common Stock for each Share held on the effective date of the
transaction (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding Shares); provided, however, that if such consideration received in the Change in Control is not
solely common stock of the Successor Corporation, the Administrator may, with the consent of the Successor Corporation, provide for the consideration to be received upon the exercise of an Option or Stock Appreciation Right or upon the payout of a
Restricted Stock Unit, Performance Share or Performance Unit, for each Share subject to such Award (or in the case of Performance Units denominated in dollars, the number of implied shares determined by dividing the value of the Performance Units by
the per share consideration received by holders of Common Stock in the Change in Control), to be solely common stock of the Successor Corporation equal in fair market value to the per share consideration received by holders of Common Stock in the
Change in Control. 

  
 14 

 Notwithstanding anything in this Section 16(c) to the contrary, an Award that
vests, is earned or paid-out upon the satisfaction of one or more performance goals will not be considered assumed if the Company or its successor modifies any of such performance goals without the
Participant’s consent; provided, however, a modification to such performance goals only to reflect the Successor Corporation’s post-Change in Control corporate structure will not be deemed to invalidate an otherwise valid Award assumption.

 Notwithstanding anything in this Section 16(c) to the contrary, if a payment under an Award Agreement is subject to Code
Section 409A and if the change in control definition contained in the Award Agreement does not comply with the definition of “change of control” for purposes of a distribution under Code Section 409A, then any payment of an
amount that is otherwise accelerated under this Section will be delayed until the earliest time that such payment would be permissible under Code Section 409A without triggering any penalties applicable under Code Section 409A. 

17. Tax Withholding 
 (a) Withholding Requirements. Prior to the delivery of any Shares or cash pursuant to an Award (or exercise thereof), the Company will have the power and the right to deduct or withhold, or require
a Participant to remit to the Company, an amount sufficient to satisfy federal, state, local, foreign or other taxes (including the Participant’s FICA obligation) required to be withheld with respect to such Award (or exercise thereof).

 (b) Withholding Arrangements. The Administrator, in its sole discretion and pursuant to such procedures as it may
specify from time to time, may permit a Participant to satisfy such tax withholding obligation, in whole or in part by (without limitation) (a) paying cash (or cash equivalent), (b) electing to have the Company withhold otherwise
deliverable cash or Shares having a fair market value equal to the minimum statutory amount required to be withheld or such greater amount as the Administrator may determine if such amount would not have adverse accounting consequences, as the
Administrator determines in its sole discretion, (c) delivering to the Company already-owned Shares having a fair market value equal to the minimum statutory amount required to be withheld, or such greater amount as the Administrator may
determine if such amount would not have adverse accounting consequences, as the Administrator determines in its sole discretion, or (d) selling a sufficient number of Shares otherwise deliverable to the Participant through such means as the
Administrator may determine in its sole discretion (whether through a broker or otherwise) equal to the amount required to be withheld. The fair market value of the Shares to be withheld or delivered will be determined as of the date that the taxes
are required to be withheld. 
 (c) Compliance With Code Section 409A. Awards will be designed and
operated in such a manner that they are either exempt from the application of, or comply with, the requirements of Code Section 409A such that the grant, payment, settlement or deferral will not be subject to the additional tax or interest
applicable under Code Section 409A, except as otherwise determined in the sole discretion of the Administrator. The Plan and each Award Agreement under the Plan is intended to meet the requirements of Code Section 409A and will be
construed and interpreted in accordance with such intent, except as otherwise determined in the sole discretion of the Administrator. To the extent that an Award or payment, or the settlement or deferral thereof, is subject to Code
Section 409A, the Award will be granted, paid, settled or deferred in a manner that will meet the requirements of Code Section 409A, such that the grant, payment, settlement or deferral will not be subject to the additional tax or interest
applicable under Code Section 409A. 
 18. No Effect on Employment or Service. Neither the Plan nor any Award will
confer upon a Participant any right with respect to continuing the Participant’s relationship as a Service Provider with the Company, nor will they interfere in any way with the Participant’s right or the Company’s right to terminate
such relationship at any time, with or without cause, to the extent permitted by Applicable Laws. 
 19. Date of Grant.
The date of grant of an Award will be, for all purposes, the date on which the Administrator makes the determination granting such Award, or such other later date as is determined by the Administrator. Notice of the determination will be provided to
each Participant within a reasonable time after the date of such grant. 

  
 15 

 20. Term of Plan. Subject to Section 25 of the Plan, the Plan will
become effective upon its adoption by the Board. It will continue in effect for a term of ten (10) years unless terminated earlier under Section 21 of the Plan. 

21. Amendment and Termination of the Plan. 
 (a) Amendment and Termination. The Board or the Administrator may at any time amend, alter, suspend or terminate the Plan. 
 (b) Stockholder Approval. The Company will obtain stockholder approval of any Plan amendment to the extent necessary and desirable to comply with Applicable Laws. 

(c) Effect of Amendment or Termination. No amendment, alteration, suspension or termination of the Plan will impair the rights of
any Participant, unless mutually agreed otherwise between the Participant and the Administrator, which agreement must be in writing and signed by the Participant and the Company. Termination of the Plan will not affect the Administrator’s
ability to exercise the powers granted to it hereunder with respect to Awards granted under the Plan prior to the date of such termination. 
 22. Conditions Upon Issuance of Shares. 
 (a) Legal Compliance.
Shares will not be issued pursuant to the exercise of an Award unless the exercise of such Award and the issuance and delivery of such Shares will comply with Applicable Laws and will be further subject to the approval of counsel for the Company
with respect to such compliance. 
 (b) Investment Representations. As a condition to the exercise of an Award, the
Company may require the person exercising such Award to represent and warrant at the time of any such exercise that the Shares are being purchased only for investment and without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required. 
 23. Inability to Obtain Authority. The
inability of the Company to obtain authority from any regulatory body having jurisdiction or to complete or comply with the requirements of any registration or other qualification of the Shares under any state, federal or foreign law or under the
rules and regulations of the Securities and Exchange Commission, the stock exchange on which Shares of the same class are then listed, or any other governmental or regulatory body, which authority, registration, qualification or rule compliance is
deemed by the Company’s counsel to be necessary or advisable for the issuance and sale of any Shares hereunder, will relieve the Company of any liability in respect of the failure to issue or sell such Shares as to which such requisite
authority, registration, qualification or rule compliance will not have been obtained. 
 24. Forfeiture Events. The
Administrator may specify in an Award Agreement that the Participant’s rights, payments, and benefits with respect to an Award will be subject to reduction, cancellation, forfeiture, or recoupment upon the occurrence of certain specified
events, in addition to any otherwise applicable vesting or performance conditions of an Award. Such events may include, but will not be limited to, fraud, breach of a fiduciary duty, restatement of financial statements as a result of fraud or
willful errors or omissions, termination of employment for cause, violation of material Company and/or Subsidiary policies, breach of non-competition, confidentiality, or other restrictive covenants that may
apply to the Participant, or other conduct by the Participant that is detrimental to the business or reputation of the Company and/or its Subsidiaries. The Administrator may also require the application of this Section with respect to any Award
previously granted to a Participant even without any specified terms being included in any applicable Award Agreement to the extent required under Applicable Laws. 
 25. Stockholder Approval. The Plan will be subject to approval by the stockholders of the Company within twelve (12) months after the date the Plan is adopted. Such stockholder approval will
be obtained in the manner and to the degree required under Applicable Laws. 

  
 16Exhibit 10.2

 Exhibit 10.2 

RAMBUS INC. 
 2015 EMPLOYEE STOCK PURCHASE PLAN 
 (as amended March 8, 2018) 

The following constitutes the provisions of the 2015 Employee Stock Purchase Plan of Rambus Inc. 

1. Purpose. The purpose of the Plan is to provide Employees with an opportunity to purchase Common Stock through accumulated
Contributions (as defined in Section 2(i) below). It is the intention of the Company to have the Plan qualify as an “employee stock purchase plan” under Section 423 of the Code. The provisions of the Plan, accordingly, will be
construed so as to extend and limit Plan participation in a uniform and nondiscriminatory basis consistent with the requirements of Section 423 of the Code. 
 2. Definitions. 
 (a) “Administrator” means the Board or any
committee designated by the Board to administer the Plan pursuant to Section 14. 
 (b) “Applicable Laws”
means the requirements relating to the administration of equity-based awards under U.S. state corporate laws, U.S. federal and state securities laws, the Code, any stock exchange or quotation system on which the Common Stock is listed or quoted and
the applicable laws of any foreign country or jurisdiction where options are, or will be, granted under the Plan. 
 (c)
“Board” means the Board of Directors of the Company. 
 (d) “Change of Control” means the
occurrence of any of the following events: 
 (i) Any “person” (as such term is used in Sections 13(d) and 14(d) of
the Exchange Act) becomes the “beneficial owner” (as defined in Rule 13d-3 of the Exchange Act), directly or indirectly, of securities of the Company representing fifty percent (50%) or more of the
total voting power represented by the Company’s then outstanding voting securities; or 
 (ii) The consummation of the
sale or disposition by the Company of all or substantially all of the Company’s assets; or 
 (iii) The consummation of a
merger or consolidation of the Company, with any other corporation, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining
outstanding or by being converted into voting securities of the surviving entity or its parent) at least fifty percent (50%) of the total voting power represented by the voting securities of the Company, or such surviving entity or its parent
outstanding immediately after such merger or consolidation; or 
 (iv) A change in the composition of the Board occurring
within a two (2)-year period, as a result of which fewer than a majority of the Directors are Incumbent Directors. “Incumbent Directors” means Directors who either (A) are Directors as of the effective date of the Plan (pursuant to
Section 23 hereof), or (B) are elected, or nominated for election, to the Board with the affirmative votes of at least a majority of those Incumbent Directors at the time of such election or nomination (but will not include an individual
whose election or nomination is in connection with an actual or threatened proxy contest relating to the election of Directors of the Company). 

  
 1 

 For the avoidance of doubt, a transaction will not constitute a Change of Control if:
(i) its sole purpose is to change the state of the Company’s incorporation, or (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the persons who held the Company’s
securities immediately before such transaction. 
 (e) “Code” means the Internal Revenue Code of 1986, as
amended. Any reference to a section of the Code herein will be a reference to any successor or amended section of the Code. 

(f) “Common Stock” means the common stock of the Company. 

(g) “Company” means Rambus Inc., a Delaware corporation.  

(h) “Compensation” means an Employee’s base straight time gross earnings, but exclusive of payments for overtime,
shift premium, incentive compensation, incentive payments, bonuses and other compensation. The Administrator, in its discretion, may on a uniform and nondiscriminatory basis, establish a different definition of Compensation for a subsequent Offering
Period. 
 (i) “Contributions” means the payroll deductions and other additional payments to the Company that
the Company may permit to be made by a participant to fund the exercise of options granted pursuant to the Plan. 
 (j)
“Designated Subsidiary” means any Subsidiary that has been designated by the Administrator from time to time in its sole discretion as eligible to participate in the Plan. 

(k) “Director” means a member of the Board. 
 (l) “Employee” means any individual who is a common law employee of an Employer and is customarily employed for at least twenty (20) hours per week and more than five (5) months
in any calendar year by the Employer, or any lesser number of hours per week and/or number of months in any calendar year established by the Administrator (if required under Applicable Law) for purposes of any separate Offering. For purposes of the
Plan, the employment relationship will be treated as continuing intact while the individual is on sick leave or other leave of absence that the Employer approves or is legally protected under Applicable Laws. Where the period of leave exceeds three
(3) months and the individual’s right to reemployment is not guaranteed either by statute or by contract, the employment relationship will be deemed to have terminated three (3) months and one (1) day following the start of such
leave. The Administrator, in its discretion, from time to time may, prior to an Enrollment Date for all options to be granted on such Enrollment Date, determine (on a uniform and nondiscriminatory basis or as otherwise permitted by Treasury
Regulation Section 1.423-2) that the definition of Employee will or will not include an individual if he or she: (1) has not completed at least two years of service since his or her last hire date
(or such lesser period of time as may be determined by the Administrator in its discretion), (2) customarily works not more than twenty (20) hours per week (or such lesser period of time as may be determined by the Administrator in its
discretion), (3) customarily works not more than five (5) months per calendar year (or such lesser period of time as may be determined by the Administrator in its discretion), or (4) is a highly compensated employee under
Section 414(q) of the Code with compensation above a certain level or who is an officer or subject to the disclosure requirements of Section 16(a) of the Exchange Act, provided the exclusion is applied with respect to each Offering in an
identical manner to all highly compensated individuals of the Employer whose Employees are participating in that Offering. Each exclusion shall be applied with respect to an Offering in a manner complying with U.S. Treasury Regulation Section 1.423-2(e)(2). Except as required by Applicable Law, any time-based eligibility requirements will be determined as of the Enrollment Date of the applicable Offering Period. 

(m) “Employer” means any one or all of the Company and its Designated Subsidiaries. 

(n) “Enrollment Date” means the first Trading Day of each Offering Period. 

  
 2 

 (o) “Exchange Act” means the Securities Exchange Act of 1934, as
amended, including the rules and regulations promulgated thereunder. 
 (p) “Exercise Date” means the first
Trading Day on or after May 1 and November 1 of each year. The first Exercise Date under the Plan will be November 2, 2015. 
 (q) “Fair Market Value” means, as of any date and unless the Administrator determines otherwise, the value of Common Stock determined as follows: 

(i) If the Common Stock is listed on any established stock exchange or a national market system, including without limitation the Nasdaq
Global Select Market, the Nasdaq Global Market or the Nasdaq Capital Market of The Nasdaq Stock Market, its Fair Market Value will be the closing sales price for the Common Stock (or the closing bid, if no sales were reported) as quoted on such
exchange or system on the date of determination, as reported in The Wall Street Journal or such other source as the Administrator deems reliable, or; 
 (ii) If the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, its Fair Market Value will be the mean of the closing bid and asked prices for the
Common Stock on the date of determination, as reported in The Wall Street Journal or such other source as the Administrator deems reliable, or; 
 (iii) In the absence of an established market for the Common Stock, its Fair Market Value will be determined in good faith by the Administrator. 

(r) “New Exercise Date” means a new Exercise Date if the Administrator shortens any Offering Period then in progress.

 (s) “Offering” means an offer under the Plan of an option that may be exercised during an Offering Period as
further described in Section 4. For purposes of this Plan, the Administrator may designate separate Offerings under the Plan (the terms of which need not be identical) in which Employees of one or more Employers will participate, even if the
dates of the applicable Offering Periods of each such Offering are identical and the provisions of the Plan will separately apply to each Offering. To the extent permitted by U.S. Treasury Regulation
Section 1.423-2(a)(1), the terms of each Offering need not be identical provided that the terms of the Plan and an Offering together satisfy U.S. Treasury Regulation
Section 1.423-2(a)(2) and (a)(3). 
 (t) “Offering Periods” means
the periods of approximately six (6) months during which an option granted pursuant to the Plan may be exercised, commencing on the first Trading Day on or after May 1 and November 1 of each year and terminating on the first Trading
Day on or after the May 1 and November 1 Offering Period commencement date approximately six (6) months later. The first Offering Period under the Plan will commence on November 2, 2015, subject to the approval of
the Plan by the stockholders of the Company at the 2015 Annual Meeting of Stockholders, and the first Exercise Date under the Plan will be May 2, 2016. The second Offering Period under the Plan will commence on May 2, 2016. The duration
and timing of Offering Periods may be changed pursuant to Sections 4 and 20 of this Plan. 
 (u) “Parent” means
a “parent corporation,” whether now or hereafter existing, as defined in Section 424(e) of the Code. 
 (v)
“Plan” means this 2015 Employee Stock Purchase Plan. 
 (w) “Purchase Price” means an amount
equal to eighty-five percent (85%) of the Fair Market Value of a share of Common Stock on the Enrollment Date or on the Exercise Date, whichever is lower; provided however, that the Purchase Price may be determined for subsequent Offering Periods by
the Administrator subject to compliance with Section 423 of the Code (or any successor rule or provision or any other Applicable Law or regulation) or pursuant to Section 20. 

  
 3 

 (x) “Subsidiary” means a “subsidiary corporation,” whether
now or hereafter existing, as defined in Section 424(f) of the Code. 
 (y) “Trading Day” means a day on
which the U.S. national stock exchanges and the Nasdaq System are open for trading. 
 (z) “U.S. Treasury
Regulations” means the Treasury Regulations of the Code. Reference to a specific Treasury Regulation or Section of the Code will include such Treasury Regulation or Section, any valid regulation promulgated under such Section, and any
comparable provision of any future legislation or regulation amending, supplementing or superseding such Section or regulation. 

3. Eligibility. 
 (a) Offering Periods. Any individual who is an Employee as of the Enrollment Date of any Offering Period will be eligible to participate in such Offering Period, subject to the requirements of
Section 5. 
 (b) Non-U.S. Employees. Employees who are citizens or
residents of a non-U.S. jurisdiction (without regard to whether they are also citizens of the United States or resident aliens (within the meaning of Section 7701(b)(1)(A) of the Code)) may be excluded
from participation in the Plan or an Offering if the participation of such Employees is prohibited under the laws of the applicable jurisdiction or if complying with the laws of the applicable jurisdiction would cause the Plan or an Offering to
violate Section 423 of the Code. 
 (c) Limitations. Any provisions of the Plan to the contrary notwithstanding, no
Employee will be granted an option under the Plan (i) to the extent that, immediately after the grant, such Employee (or any other person whose stock would be attributed to such Employee pursuant to Section 424(d) of the Code) would own
capital stock of the Company or any Parent or Subsidiary of the Company and/or hold outstanding options to purchase such stock possessing five percent (5%) or more of the total combined voting power or value of all classes of the capital stock of
the Company or of any Parent or Subsidiary of the Company, or (ii) to the extent that his or her rights to purchase stock under all employee stock purchase plans (as defined in Section 423 of the Code) of the Company or any Parent or
Subsidiary of the Company accrues at a rate which exceeds twenty-five thousand dollars ($25,000) worth of stock (determined at the Fair Market Value of the stock at the time such option is granted) for each calendar year in which such option is
outstanding at any time, as determined in accordance with Section 423 of the Code and the regulations thereunder. 
 4.
Offering Periods. The Plan will be implemented by consecutive Offering Periods with a new Offering Period commencing on the first Trading Day on or after May 1 and November 1 of each year. The first Offering Period under the Plan
will commence on November 2, 2015, subject to the approval of the Plan by the stockholders of the Company at the 2015 Annual Meeting of Stockholders, and the first Exercise Date under the Plan will be May 2, 2016. The Second Offering
Period under the Plan will commence on May 2, 2016, or on such other date as the Administrator will determine, and continuing thereafter until terminated in accordance with Section 20. The Administrator will have the power to change the
duration of Offering Periods (including the commencement dates thereof) with respect to future Offerings without stockholder approval if such change is announced prior to the scheduled beginning of the first Offering Period to be affected
thereafter. 
 5. Participation. An Employee who is eligible to participate in the Plan pursuant to Section 3(a) may
become a participant by (i) submitting to the Company’s payroll office (or its designee), on or before a date prescribed by the Administrator prior to an applicable Enrollment Date, a properly completed subscription agreement authorizing
Contributions in the form provided by the Administrator for such purpose, or (ii) following an electronic or other enrollment procedure prescribed by the Administrator. 

  
 4 

 6. Contributions. 

(a) At the time a participant enrolls in the Plan pursuant to Section 5, he or she will elect to have payroll deductions made on
each payday or other Contributions (to the extent permitted by the Administrator) made during the Offering Period in an amount not exceeding fifteen percent (15%) of the Compensation which he or she receives on each such payday. The Administrator,
in its sole discretion, may permit all participants in a specified Offering to contribute amounts to the Plan through payment by cash, check or other means set forth in the subscription agreement prior to each Exercise Date of each Offering Period,
provided that payment through means other than payroll deductions shall be permitted only if the participant has not already had the maximum permitted amount withheld through payroll deductions during the Offering Period. A participant’s
subscription agreement shall remain in effect for successive Offering Periods unless terminated as provided in Section 10 hereof. 
 (b) Payroll deductions authorized by a participant will commence on the first payday following the Enrollment Date and will end on the last payday in the Offering Period to which such authorization is
applicable, unless sooner terminated by the participant as provided in Section 10. 
 (c) All Contributions made for a
participant will be credited to his or her account under the Plan and will be made in whole percentages only. A participant may not make any additional payments into such account. 

(d) A participant may discontinue his or her participation in the Plan as provided in Section 10, or may increase or decrease the
rate of his or her Contributions during the Offering Period by (i) properly completing and submitting to the Company’s payroll office (or its designee), on or before a date prescribed by the Administrator prior to an applicable Exercise
Date, a new subscription agreement authorizing the change in Contribution rate in the form provided by the Administrator for such purpose, or (ii) following an electronic or other procedure prescribed by the Administrator; provided, however,
that unless the Administrator provides otherwise, a participant may reduce, but not increase, his or her Contribution rate during an Offering Period for that Offering Period (it being understood that a participant may increase the Contribution rate
for future Offering Periods prior to the commencement of any such Offering Period). If a participant has not followed such procedures to change the rate of Contributions, the rate of his or her Contributions will continue at the originally elected
rate throughout the Offering Period and future Offering Periods (unless terminated as provided in Section 10). The Administrator may, in its sole discretion, limit the nature and/or number of Contribution rate changes that may be made by
participants during any Offering Period and may establish such other conditions or limitations as it deems appropriate for Plan administration. Any change in payroll deduction rate made pursuant to this Section 6(d) will be effective as of the
first full payroll period following five (5) business days after the date on which the change is made by the participant (unless the Administrator, in its sole discretion, elects to process a given change in payroll deduction rate more
quickly). 
 (e) Notwithstanding the foregoing, to the extent necessary to comply with Section 423(b)(8) of the Code and
Section 3(b), a participant’s Contributions may be decreased to zero percent (0%) at any time during an Offering Period. Subject to Section 423(b)(8) of the Code and Section 3(c) hereof, Contributions will recommence at the rate
originally elected by the participant effective as of the beginning of the first Offering Period which is scheduled to end in the following calendar year, unless terminated by the participant as provided in Section 10. 

(f) Notwithstanding any provisions to the contrary in the Plan, the Administrator may allow Employees to participate in the Plan via cash
contributions instead of payroll deductions if (i) payroll deductions are not permitted under applicable local law, and (ii) the Administrator determines that cash contributions are permissible under Section 423 of the Code.

 (g) At the time the option is exercised, in whole or in part, or at the time some or all of the Company’s Common Stock
issued under the Plan is disposed of (or any other time that a taxable event related to the Plan occurs), the participant must make adequate provision for the Company’s or the Employer’s federal, state, local or any other tax liability
payable to any authority including taxes imposed by jurisdictions outside of the U.S., national insurance, social security or other tax withholding obligations, if any, which arise upon the exercise of

  
 5 

 
the option or the disposition of the Common Stock (or any other time that a taxable event related to the Plan occurs). At any time, the Company or the Employer may, but will not be obligated to,
withhold from the participant’s compensation the amount necessary for the Company or the Employer to meet applicable withholding obligations, including any withholding required to make available to the Company or the Employer any tax deductions
or benefits attributable to the sale or early disposition of Common Stock by the Employee. In addition, the Company or the Employer, may, but will not be obligated to, withhold from the proceeds of the sale of Common Stock or any other method of
withholding the Company or the Employer deems appropriate to the extent permitted by U.S. Treasury Regulation Section 1.423-2(f). 
 7. Grant of Option. On the Enrollment Date of each Offering Period, each Employee participating in such Offering Period will be granted an option to purchase on the Exercise Date(s) of such
Offering Period (at the applicable Purchase Price) up to a number of shares of Common Stock determined by dividing such participant’s Contributions accumulated prior to such Exercise Date and retained in the participant’s account as of the
Exercise Date by the applicable Purchase Price; provided that in no event will a participant be permitted to purchase during each Offering Period more than five thousand (5,000) shares of Common Stock (subject to any adjustment pursuant to
Section 19), and provided further that such purchase will be subject to the limitations set forth in Sections 3(c) and 13. The Employee may accept the grant of such option with respect to any Offering Period under the Plan, by electing to
participate in the Plan in accordance with the requirements of Section 5. The Administrator may, for future Offering Periods, increase or decrease, in its absolute discretion, the maximum number of shares of Common Stock that a participant may
purchase during each Offering Period. Exercise of the option will occur as provided in Section 8, unless the participant has withdrawn pursuant to Section 10. The option will expire on the last day of the Offering Period. 

8. Exercise of Option. 
 (a) Unless a participant withdraws from the Plan as provided in Section 10, his or her option for the purchase of shares of Common Stock will be exercised automatically on the Exercise Date, and the
maximum number of full shares subject to the option will be purchased for such participant at the applicable Purchase Price with the accumulated Contributions in his or her account. No fractional shares of Common Stock will be purchased; any
Contributions accumulated in a participant’s account which are not sufficient to purchase a full share will be returned to the participant. Any other funds left over in a participant’s account after the Exercise Date will be returned to
the participant. During a participant’s lifetime, a participant’s option to purchase shares hereunder is exercisable only by him or her. 
 (b) Notwithstanding any contrary Plan provision, if the Administrator determines that, on a given Exercise Date, the number of shares of Common Stock with respect to which options are to be exercised may
exceed (i) the number of shares of Common Stock that were available for sale under the Plan on the Enrollment Date of the applicable Offering Period, or (ii) the number of shares of Common Stock available for sale under the Plan on such
Exercise Date, the Administrator may in its sole discretion (x) provide that the Company will make a pro rata allocation of the shares of Common Stock available for purchase on such Enrollment Date or Exercise Date, as applicable, in as uniform
a manner as will be practicable and as it will determine in its sole discretion to be equitable among all participants exercising options to purchase Common Stock on such Exercise Date, and either (x) continue any Offering Period then in
effect, or (y) terminate any Offering Period then in effect pursuant to Section 20. The Company may make pro rata allocation of the shares of Common Stock available on the Enrollment Date of any applicable Offering Period pursuant to the
preceding sentence, notwithstanding any authorization of additional shares of Common Stock for issuance under the Plan by the Company’s stockholders subsequent to such Enrollment Date. 

9. Delivery. As soon as administratively practicable after each Exercise Date on which a purchase of shares of Common Stock
occurs, the Company will arrange the delivery to each participant, as appropriate, the shares purchased upon exercise of his or her option in a form determined by the Administrator (in its sole discretion) and pursuant to rules established by the
Administrator. The Company may permit or require that shares be 

  
 6 

 
deposited directly with a broker designated by the Company or to a designated agent of the Company, and the Company may utilize electronic or automated methods of share transfer. The Company may
require that shares be retained with such broker or agent for a designated period of time and/or may establish other procedures to permit tracking of disqualifying dispositions of such shares. No participant will have any voting, dividend, or other
stockholder rights with respect to shares of Common Stock subject to any option granted under the Plan until such shares have been purchased and delivered to the participant as provided in this Section 9. 

10. Withdrawal. 
 (a) Under procedures established by the Administrator, a participant may withdraw all but not less than all the Contributions credited to his or her account and not yet used to exercise his or her option
under the Plan at any time by (i) submitting to the Company’s payroll office (or its designee) a written notice of withdrawal in the form prescribed by the Administrator for such purpose, or (ii) following an electronic or other
withdrawal procedure prescribed by the Administrator. All of the participant’s Contributions credited to his or her account will be paid to such participant as promptly as practicable after the effective date of his or her withdrawal and such
participant’s option for the Offering Period will be automatically terminated, and no further Contributions for the purchase of shares will be made for such Offering Period. If a participant withdraws from an Offering Period, Contributions will
not resume at the beginning of the succeeding Offering Period unless the participant re-enrolls in the Plan in accordance with the provisions of Section 5. 

(b) A participant’s withdrawal from an Offering Period will not have any effect upon his or her eligibility to participate in any
similar plan which may hereafter be adopted by the Company or in succeeding Offering Periods which commence after the termination of the Offering Period from which the participant withdraws. 

11. Termination of Employment. Upon a participant’s ceasing to be an Employee, for any reason, he or she will be deemed to
have elected to withdraw from the Plan and the Contributions credited to such participant’s account during the Offering Period but not yet used to purchase shares of Common Stock under the Plan will be returned to such participant or, in the
case of his or her death, to the person or persons entitled thereto under Section 15, and such participant’s option will be automatically terminated. The preceding sentence notwithstanding, a participant who receives payment in lieu of
notice of termination of employment will be treated as continuing to be an Employee for the participant’s customary number of hours per week of employment during the period in which the participant is subject to such payment in lieu of notice.

 12. Interest. No interest will accrue on the Contributions of a participant in the Plan, except as may be required by
Applicable Law, as determined by the Company, and if so required by the laws of a particular jurisdiction, shall apply to all participants in the relevant Offering except to the extent otherwise permitted by U.S. Treasury Regulation Section 1.423-2(f). 
 13. Stock. 

(a) Subject to adjustment upon changes in capitalization of the Company as provided in Section 19, the maximum number of shares of
Common Stock which will be made available for sale under the Plan will be 4,000,000 shares of Common Stock. 
 (b) Shares of
Common Stock to be delivered to a participant under the Plan will be registered in the name of the participant or in the name of the participant and his or her spouse. 
 14. Administration. The Board or a committee of members of the Board who will be appointed from time to time by, and will serve at the pleasure of, the Board, will administer the Plan. The
Administrator will have full and exclusive discretionary authority to construe, interpret and apply the terms of the Plan, to designate separate Offerings under the Plan, to determine eligibility, to adjudicate all disputed claims filed under the
Plan and to 

  
 7 

 
establish such procedures that it deems necessary for administration of the Plan (including, without limitation, to adopt such procedures and sub-plans as
are necessary or appropriate to permit the participation in the Plan by employees who are foreign nationals or employed outside the United States, the terms of which sub-plans may take precedence over other
provisions of this Plan, with the exception of Section 13(a) hereof, but unless otherwise superseded by the terms of such sub-plan, the provisions of this Plan will govern the operation of such sub-plan). Unless otherwise determined by the Administrator, the Employees eligible to participate in each such sub-plan will participate in a separate Offering. The
Administrator, in its sole discretion and on such terms and conditions as it may provide, may delegate to one or more individuals all or any part of its authority and powers under the Plan. Without limiting the generality of this Section 14,
the Administrator is specifically authorized to adopt rules and procedures regarding eligibility to participate, the definition of Compensation, handling of Contributions, making of Contributions to the Plan (including, without limitation, in forms
other than payroll deductions), establishment of bank or trust accounts to hold Contributions, payment of interest, conversion of local currency, obligations to pay payroll tax, determination of beneficiary designation requirements, withholding
procedures and handling of stock certificates that vary with applicable local requirements. The Administrator also is authorized to determine that, to the extent permitted by U.S. Treasury Regulation
Section 1.423-2(f), the terms of an option granted under the Plan or an Offering to citizens or residents of a non-U.S. jurisdiction will be less favorable than the
terms of options granted under the Plan or the same Offering to employees resident solely in the U.S. Every finding, decision and determination made by the Administrator (or its designee) will, to the full extent permitted by law, be final and
binding upon all parties. 
 15. Designation of Beneficiary. 

(a) A participant may designate a beneficiary who is to receive any shares of Common Stock and cash, if any, from the participant’s
account under the Plan in the event of such participant’s death subsequent to an Exercise Date on which the option is exercised but prior to delivery to such participant of such shares and cash. In addition, a participant may designate a
beneficiary who is to receive any cash from the participant’s account under the Plan in the event of such participant’s death prior to exercise of the option. If a participant is married and the designated beneficiary is not the spouse,
spousal consent will be required for such designation to be effective. 
 (b) The participant may change such designation of
beneficiary at any time by written notice. In the event of the death of a participant and in the absence of a beneficiary validly designated under the Plan who is living at the time of such participant’s death, the Company will deliver such
shares and/or cash to the executor or administrator of the estate of the participant, or if no such executor or administrator has been appointed (to the knowledge of the Company), the Company, in its discretion, may deliver such shares and/or cash
to the spouse or to any one or more dependents or relatives of the participant, or if no spouse, dependent or relative is known to the Company, then to such other person as the Company may designate. 

(c) All beneficiary designations under this Section 15 will be made in such form and manner as the Administrator may prescribe from
time to time. Notwithstanding Sections 15(a) and (b) above, the Company and/or the Administrator may decide not to permit such designations by participants in non-U.S. jurisdictions to the extent
permitted by U.S. Treasury Regulation Section 1.423-2(f). 
 16.
Transferability. Neither Contributions credited to a participant’s account nor any rights with regard to the exercise of an option or to receive shares of Common Stock under the Plan may be assigned, transferred, pledged or otherwise
disposed of in any way (other than by will, the laws of descent and distribution or as provided in Section 15) by the participant. Any such attempt at assignment, transfer, pledge or other disposition will be without effect, except that the
Company may treat such act as an election to withdraw from an Offering Period in accordance with Section 10. 
 17. Use
of Funds. The Company may use all Contributions received or held by the Company under the Plan for any corporate purpose, and the Company will not be obligated to segregate such Contributions, except under Offerings in which applicable local law
requires that Contributions to the Plan by participants be segregated from 

  
 8 

 
the Company’s general corporate funds and/or deposited with an independent third party for participants in non-U.S. jurisdictions. Until shares of
Common Stock are issued under the Plan (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), a participant will only have the rights of an unsecured creditor with respect to such
shares. 
 18. Reports. Individual accounts will be maintained for each participant in the Plan. Statements of account
will be given to participating Employees at least annually, which statements will set forth the amounts of Contributions, the Purchase Price, the number of shares of Common Stock purchased and the remaining cash balance, if any. 

19. Adjustments, Dissolution, Liquidation, Merger or Change of Control. 

(a) Adjustments. In the event that any dividend or other distribution (whether in the form of cash, Common Stock, other
securities, or other property), recapitalization, stock split, reverse stock split, reorganization, merger, consolidation, split-up, spin-off, combination, repurchase,
or exchange of Common Stock or other securities of the Company, or other change in the corporate structure of the Company affecting the Common Stock such that an adjustment is appropriate in order to prevent dilution or enlargement of the benefits
or potential benefits intended to be made available under the Plan, the Administrator will adjust the number and class of Common Stock which may be delivered under the Plan, the Purchase Price per share and the number of shares of Common Stock
covered by each option under the Plan which has not yet been exercised, and the numerical limits of Sections 7 and 13. 
 (b) Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of the Company, any Offering Period then in progress will be shortened by setting a New Exercise Date, and
will terminate immediately prior to the consummation of such proposed dissolution or liquidation, unless provided otherwise by the Administrator. The New Exercise Date will be before the date of the Company’s proposed dissolution or
liquidation. The Administrator will notify each participant in writing or electronically prior to the New Exercise Date, that the Exercise Date for the participant’s option has been changed to the New Exercise Date and that the
participant’s option will be exercised automatically on the New Exercise Date, unless prior to such date the participant has withdrawn from the Offering Period as provided in Section 10. 

(c) Merger or Change of Control. In the event of a merger or Change of Control, each outstanding option will be assumed or an
equivalent option substituted by the successor corporation or a Parent or Subsidiary of the successor corporation. In the event that the successor corporation refuses to assume or substitute for the option, any Offering Period then in progress will
be shortened by setting a New Exercise Date and any Offering Period then in progress will end on the New Exercise Date. The New Exercise Date will be before the date of the Company’s proposed merger or Change of Control. The Administrator will
notify each participant in writing or electronically prior to the New Exercise Date, that the Exercise Date for the participant’s option has been changed to the New Exercise Date and that the participant’s option will be exercised
automatically on the New Exercise Date, unless prior to such date the participant has withdrawn from the Offering Period as provided in Section 10. 
 20. Amendment or Termination. 
 (a) The Administrator may at any time and
for any reason terminate or amend the Plan. Except as provided in Section 19, no such termination can affect options previously granted under the Plan, provided that an Offering Period may be terminated by the Administrator on any Exercise Date
if the Administrator determines that the termination or suspension of the Plan is in the best interests of the Company and its stockholders. Except as provided in Section 19 and this Section 20, no amendment may make any change in any
option theretofore granted which adversely affects the rights of any participant. To the extent necessary to comply with Section 423 of the Code (or any successor rule or provision or any other applicable law, regulation or stock exchange
rule), the Company will obtain stockholder approval in such a manner and to such a degree as required. 

  
 9 

 (b) Without stockholder consent and without regard to whether any participant rights
may be considered to have been “adversely affected,” the Administrator will be entitled to change the Offering Periods, designate separate Offerings, limit the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a currency other than U.S. dollars, permit Contributions in excess of the amount designated by a participant in order to adjust for delays or mistakes in the Company’s
processing of properly completed withholding elections, establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of Common Stock for each participant properly
correspond with Contribution amounts, and establish such other limitations or procedures as the Administrator determines in its sole discretion advisable which are consistent with the Plan. 

(c) In the event the Administrator determines that the ongoing operation of the Plan may result in unfavorable financial accounting
consequences, the Administrator may, in its discretion and, to the extent necessary or desirable, modify, amend or terminate the Plan to reduce or eliminate such accounting consequence including, but not limited to: 

(i) amending the Plan to conform with the safe harbor definition under the Financial Accounting Standards Board Accounting Standards
Codification Topic 718 (or any successor thereto), including with respect to an Offering Period underway at the time; 
 (ii)
altering the Purchase Price for any Offering Period including an Offering Period underway at the time of the change in Purchase Price; 
 (iii) shortening any Offering Period by setting a New Exercise Date, including an Offering Period underway at the time of the Administrator action; 

(iv) reducing the maximum percentage of Compensation a participant may elect to set aside as Contributions; and 

(v) reducing the maximum number of Shares a participant may purchase during any Offering Period. 

Such modifications or amendments will not require stockholder approval or the consent of any Plan participants. 

21. Notices. All notices or other communications by a participant to the Company under or in connection with the Plan will be
deemed to have been duly given when received in the form and manner specified by the Company at the location, or by the person, designated by the Company for the receipt thereof. 

22. Conditions Upon Issuance of Shares. Shares of Common Stock will not be issued with respect to an option under the Plan unless
the exercise of such option and the issuance and delivery of such shares pursuant thereto will comply with all applicable provisions of law, domestic or foreign, including, without limitation, the Securities Act of 1933, as amended, including the
rules and regulations promulgated thereunder, the Exchange Act, and the requirements of any stock exchange upon which the shares may then be listed, and will be further subject to the approval of counsel for the Company with respect to such
compliance. 
 As a condition to the exercise of an option, the Company may require the person exercising such option to
represent and warrant at the time of any such exercise that the shares are being purchased only for investment and without any present intention to sell or distribute such shares if, in the opinion of counsel for the Company, such a representation
is required by any of the aforementioned applicable provisions of law. 
 23. Term of Plan. The Plan will become
effective upon the earlier to occur of its adoption by the Board or its approval by the stockholders of the Company. It will continue in effect until terminated under Section 20. 

  
 10 

 24. Code Section 409A. The Plan is exempt from the
application of Code Section 409A and any ambiguities herein will be interpreted to so be exempt from Code Section 409A. In furtherance of the foregoing and notwithstanding any provision in the Plan to the contrary, if the Administrator
determines that an option granted under the Plan may be subject to Code Section 409A or that any provision in the Plan would cause an option under the Plan to be subject to Code Section 409A, the Administrator may amend the terms of the
Plan and/or of an outstanding option granted under the Plan, or take such other action the Administrator determines is necessary or appropriate, in each case, without the participant’s consent, to exempt any outstanding option or future option
that may be granted under the Plan from or to allow any such options to comply with Code Section 409A, but only to the extent any such amendments or action by the Administrator would not violate Code Section 409A. Notwithstanding the
foregoing, the Company will have no liability to a participant or any other party if the option to purchase Common Stock under the Plan that is intended to be exempt from or compliant with Code Section 409A is not so exempt or compliant or for
any action taken by the Administrator with respect thereto. The Company makes no representation that the option to purchase Common Stock under the Plan is compliant with Code Section 409A. 

25. Stockholder Approval. The Plan will be subject to approval by the stockholders of the Company within twelve (12) months
after the date the Plan is adopted by the Board. Such stockholder approval will be obtained in the manner and to the degree required under Applicable Laws. 
 26. Governing Law. The Plan shall be governed by, and construed in accordance with, the laws of the State of California (except its
choice-of-law provisions). 
 27.
Severability. If any provision of the Plan is or becomes or is deemed to be invalid, illegal, or unenforceable for any reason in any jurisdiction or as to any participant, such invalidity, illegality or unenforceability shall not affect the
remaining parts of the Plan, and the Plan will be construed and enforced as to such jurisdiction or participant as if the invalid, illegal or unenforceable provision had not been included. 

  
 11 

 SAMPLE SUBSCRIPTION AGREEMENT 

RAMBUS INC. 
 2015 EMPLOYEE STOCK PURCHASE PLAN 
 SUBSCRIPTION AGREEMENT

  

							
	        Original Application	 		 	Offering
Date:                        
	         Change in Payroll Deduction Rate
	 		 		 	
	         Change of Beneficiary(ies)
	 		 		 	

  

	1.	                            
            hereby elects to participate in the Rambus Inc. 2015 Employee Stock Purchase Plan (the “Plan”) and subscribes to purchase shares of the Company’s Common Stock in
accordance with this Subscription Agreement and the Plan. 

  

	2.	I hereby authorize payroll deductions from each paycheck in the amount of     % of my Compensation on each payday (from 1 to 15%) during the
Offering Period in accordance with the Plan. (Please note that no fractional percentages are permitted.) 

  

	3.	I understand that said payroll deductions will be accumulated for the purchase of shares of Common Stock at the applicable Purchase Price determined in accordance with
the Plan. I understand that if I do not withdraw from an Offering Period, any accumulated payroll deductions will be used to automatically exercise my option. 

 

	4.	I have received a copy of the complete Plan and its accompanying prospectus. I understand that my participation in the Plan is in all respects subject to the terms of
the Plan. I understand that my ability to exercise the option under this Subscription Agreement is subject to stockholder approval of the Plan. 

  

	5.	Shares of Common Stock purchased for me under the Plan should be issued in the name(s) of Employee or Employee and Spouse only. 

 

	6.	I understand that if I dispose of any shares received by me pursuant to the Plan within 2 years after the Enrollment Date (the first day of the Offering Period during
which I purchased such shares) or one year after the Exercise Date, I will be treated for federal income tax purposes as having received ordinary income at the time of such disposition in an amount equal to the excess of the fair market value of the
shares at the time such shares were purchased by me over the price which I paid for the shares. I hereby agree to notify the Company in writing within 30 days after the date of any disposition of my shares and I will make adequate provision for
Federal, state or other tax withholding obligations, if any, which arise upon the disposition of the Common Stock. The Company may, but will not be obligated to, withhold from my compensation the amount necessary to meet any applicable
withholding obligation including any withholding necessary to make available to the Company any tax deductions or benefits attributable to sale or early disposition of Common Stock by me. If I dispose of such shares at any time after the expiration
of the 2-year and 1-year holding periods, I understand that I will be treated for federal income tax purposes as having received income only at the time of such
disposition, and that such income will be taxed as ordinary income only to the extent of an amount equal to the lesser of (1) the excess of the fair market value of the shares at the time of such disposition over the purchase price which I paid
for the shares, or (2) 15% of the fair market value of the shares on the first day of the Offering Period. The remainder of the gain, if any, recognized on such disposition will be taxed as capital gain. 

 

	7.	I hereby agree to be bound by the terms of the Plan. The effectiveness of this Subscription Agreement is dependent upon my eligibility to participate in the Plan.

  
 12 

	8.	In the event of my death, I hereby designate the following as my beneficiary(ies) to receive all payments and/or shares due me under the Plan: 

 

							
	 NAME: (Please print) 
	 	 	  	 	  	 
		 	(First)	  	(Middle)	  	(Last)

  

					
	 	  		 	 
	Relationship	  		 	
			
	 	  		 	 
	 Percentage Benefit
	  		 	(Address)

  

							
	 NAME: (Please print) 
	 	 	  	 	  	 
		 	(First)	  	(Middle)	  	(Last)

  

					
	 	  		 	 
	Relationship	  		 	
			
	 	  		 	 
	 Percentage of Benefit
	  		 	(Address)

  
 13 

					
	Employee’s Social Security Number:	  		 	 
			
	Employee’s Address:	  		 	 
			
		  		 	 
			
		  		 	 

 I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT WILL REMAIN IN EFFECT THROUGHOUT SUCCESSIVE OFFERING PERIODS UNLESS
TERMINATED BY ME. 
  

					
			
	Dated:                            
         	  		 	 
		  		 	Signature of Employee
			
		  		 	 
		  		 	Spouse’s Signature (If beneficiary other than spouse)

  
 14 

 SAMPLE WITHDRAWAL NOTICE 

RAMBUS INC. 
 2015 EMPLOYEE STOCK PURCHASE PLAN 
 NOTICE OF WITHDRAWAL 

The undersigned participant in the Offering Period of the Rambus Inc. 2015 Employee Stock Purchase Plan which began on
                    ,                      (the
“Enrollment Date”) hereby notifies the Company that he or she hereby withdraws from the Offering Period. He or she hereby directs the Company to pay to the undersigned as promptly as practicable all the payroll deductions credited to his
or her account with respect to such Offering Period. The undersigned understands and agrees that his or her option for such Offering Period will be automatically terminated. The undersigned understands further that no further payroll deductions will
be made for the purchase of shares in the current Offering Period and the undersigned will be eligible to participate in succeeding Offering Periods only by delivering to the Company a new Subscription Agreement. 

 

			
	Name and Address of Participant:
	
	  

	
	  

	
	  

	 Signature:

	
	  

		
	Date:	 	  

  
 15

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