Exhibit 10.15

STEC, INC.

STOCK OPTION AGREEMENT

RECITALS

A. The Board has adopted the Plan
for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any
Parent or Subsidiary).

B. Optionee is to render valuable services to the Corporation (or a Parent or Subsidiary), and this Agreement is
executed pursuant to, and is intended to carry out the purposes of, the Plan in connection with the Corporations grant of an option to Optionee.

C. All capitalized terms in this Agreement shall have the meaning assigned to them in the attached Appendix. In the event of any conflict between the provisions of this Agreement and those of the Plan, the provisions
of the Plan shall be controlling.

NOW, THEREFORE, it is hereby agreed as follows:

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

2. Option Term. This option shall have a maximum term of ten (10) years measured from the Grant Date and shall accordingly expire at the close of business on the Expiration Date, unless sooner
terminated in accordance with Paragraph 5 or 6.

3. Limited Transferability.

(a) This option shall be neither transferable nor assignable by Optionee other than by will or the laws of inheritance following Optionees death
and may be exercised, during Optionees lifetime, only by Optionee. However, Optionee may designate one or more persons as the beneficiary or beneficiaries of this option, and this option shall, in accordance with such designation,
automatically be transferred to such beneficiary or beneficiaries upon the Optionees death while holding this option. Such beneficiary or beneficiaries shall take the transferred option subject to all the terms and conditions of this
Agreement, including (without limitation) the limited time period during which this option may, pursuant to Paragraph 5, be exercised following Optionees death.



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(b) If this option is designated a Non-Statutory Option in the Grant Notice, then this option may be
assigned in whole or in part during Optionees lifetime to one or more members of Optionees family or to a trust established for the exclusive benefit of one or more such family members or to Optionees former spouse, to the extent
such assignment is in connection with the Optionees estate plan or pursuant to a domestic relations order. The assigned portion shall be exercisable only by the person or persons who acquire a proprietary interest in the option pursuant to
such assignment. The terms applicable to the assigned portion shall be the same as those in effect for this option immediately prior to such assignment.

4. Dates of Exercise. This option shall become exercisable for the Option Shares in one or more installments as specified in the Grant Notice. As the option becomes exercisable for such installments,
those installments shall accumulate, and the option shall remain exercisable for the accumulated installments until the Expiration Date or sooner termination of the option term under Paragraph 5 or 6.

5. Cessation of Service. The option term specified in Paragraph 2 shall terminate (and this option shall cease to be outstanding) prior to
the Expiration Date should any of the following provisions become applicable:

(a) Should Optionee cease to remain in Service for any
reason (other than death, Permanent Disability or Misconduct) while holding this option, then Optionee shall have a period of three (3) months (commencing with the date of such cessation of Service) during which to exercise this option, but in
no event shall this option be exercisable at any time after the Expiration Date.

(b) Should Optionee die while holding this option, then
the personal representative of Optionees estate or the person or persons to whom the option is transferred pursuant to Optionees will or the laws of inheritance shall have the right to exercise this option. However, if Optionee has
designated one or more beneficiaries of this option, then those persons shall have the exclusive right to exercise this option following Optionees death. Any such right to exercise this option shall lapse, and this option shall cease to be
outstanding, upon the earlier of (i) the expiration of the twelve (12)-month period measured from the date of Optionees death or (ii) the Expiration Date.

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

(d) During the limited period of post-Service exercisability, this option may not be exercised in the aggregate for more than the number of Option
Shares for which the option is exercisable at the time of Optionees cessation of Service. Upon the expiration of such limited exercise period or (if earlier) upon the Expiration Date, this option shall terminate and



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cease to be outstanding for any exercisable Option Shares for which the option has not been exercised. However, this option shall, immediately upon
Optionees cessation of Service for any reason, terminate and cease to be outstanding with respect to any Option Shares for which this option is not otherwise at that time exercisable.

(e) Should Optionees Service be terminated for Misconduct or should Optionee otherwise engage in any Misconduct while this option is outstanding,
then this option shall terminate immediately and cease to remain outstanding.

6. Special Acceleration of Option.

(a) This option, to the extent outstanding at the time of a Corporate Transaction but not otherwise fully exercisable, shall automatically accelerate
so that this option shall, immediately prior to the effective date of such Corporate Transaction, become exercisable for all of the Option Shares at the time subject to this option and may be exercised for any or all of those Option Shares as fully
vested shares of Common Stock. However, this option shall not become exercisable on such an accelerated basis, if and to the extent: (i) this option is, in connection with the Corporate Transaction, to be assumed by the successor
corporation (or parent thereof) or (ii) this option is to be replaced with a cash incentive program of the successor corporation which preserves the spread existing at the time of the Corporate Transaction on any Option Shares for which this
option is not otherwise at that time exercisable (the excess of the Fair Market Value of those Option Shares over the aggregate Exercise Price payable for such shares) and provides for subsequent payout in accordance with the same option
exercise/vesting schedule for those Option Shares set forth in the Grant Notice.

(b) Immediately following the Corporate Transaction,
this option shall terminate and cease to be outstanding, except to the extent assumed by the successor corporation (or parent thereof) in connection with the Corporate Transaction.

(c) If this option is assumed in connection with a Corporate Transaction, then this option shall be appropriately adjusted, immediately after such
Corporate Transaction, to apply to the number and class of securities which would have been issuable to Optionee in consummation of such Corporate Transaction had the option been exercised immediately prior to such Corporate Transaction, and
appropriate adjustments shall also be made to the Exercise Price, provided the aggregate Exercise Price shall remain the same. To the extent the actual holders of the Corporations outstanding Common Stock receive cash consideration for
their Common Stock in consummation of the Corporate Transaction, the successor corporation may, in connection with the assumption of this option, substitute one or more shares of its own common stock with a fair market value equivalent to the cash
consideration paid per share of Common Stock in such Corporate Transaction.

(d) This Agreement shall not in any way affect the right of
the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets.



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7. Adjustment in Option Shares.Should any change be made to the Common Stock by
reason of any stock split, stock dividend, recapitalization, combination of shares, exchange of shares or other change affecting the outstanding Common Stock as a class without the Corporations receipt of consideration, appropriate adjustments
shall be made to (i) the total number and/or class of securities subject to this option and (ii) the Exercise Price in order to reflect such change and thereby preclude a dilution or enlargement of benefits hereunder.

8. Shareholder Rights. The holder of this option shall not have any shareholder rights with respect to the Option Shares until such person
shall have exercised the option, paid the Exercise Price and become a holder of record of the purchased shares.

9. Manner of
Exercising Option.

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

(i) Execute and deliver to the Corporation a Notice of Exercise for the Option Shares for which the option is exercised.

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

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

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

(C) through a special sale and remittance procedure pursuant to which Optionee (or any other person or persons exercising the option)
shall concurrently provide irrevocable instructions (i) to a Corporation-designated brokerage firm to effect the immediate sale of the purchased shares and remit to the Corporation, out of the sale proceeds available on the settlement date,
sufficient funds to cover the aggregate Exercise Price payable for the purchased shares plus all



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applicable Federal, state and local income and employment taxes required to be withheld by the Corporation by reason of such exercise and (ii) to the
Corporation to deliver the certificates for the purchased shares directly to such brokerage firm in order to complete the sale.

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

(iii) Furnish to the Corporation appropriate documentation that the person or persons exercising the option (if
other than Optionee) have the right to exercise this option.

(iv) Make appropriate arrangements with the Corporation (or
Parent or Subsidiary employing or retaining Optionee) for the satisfaction of all Federal, state and local income and employment tax withholding requirements applicable to the option exercise.

(b) As soon as practical after the Exercise Date, the Corporation shall issue to or on behalf of Optionee (or any other person or persons exercising
this option) a certificate for the purchased Option Shares, with the appropriate legends affixed thereto.

(c) In no event may this option
be exercised for any fractional shares.

10. Compliance with Laws and Regulations.

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

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

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



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

13. Construction. This Agreement and the option evidenced hereby are made and granted pursuant to the Plan and are in all respects limited
by and subject to the terms of the Plan. All decisions of the Plan Administrator with respect to any question or issue arising under the Plan or this Agreement shall be conclusive and binding on all persons having an interest in this option.

14. Governing Law. The interpretation, performance and enforcement of this Agreement shall be governed by the laws of the
State of California without resort to that States conflict-of-laws rules.

15. MANDATORY ARBITRATION. ANY AND ALL
DISPUTES OR CONTROVERSIES BETWEEN OPTIONEE AND THE CORPORATION ARISING OUT OF, RELATING TO OR OTHERWISE CONNECTED WITH THIS AGREEMENT OR THE OPTION EVIDENCED HEREBY OR THE VALIDITY, CONSTRUCTION, PERFORMANCE OR TERMINATION OF THIS AGREEMENT SHALL BE
SETTLED EXCLUSIVELY BY BINDING ARBITRATION TO BE HELD IN THE COUNTY IN WHICH YOU ARE (OR HAVE MOST RECENTLY BEEN) EMPLOYED BY THE CORPORATION (OR ANY PARENT OR SUBSIDIARY) AT THE TIME OF SUCH ARBITRATION. THE ARBITRATION PROCEEDINGS SHALL BE
GOVERNED BY (i) THE NATIONAL RULES FOR THE RESOLUTION OF EMPLOYMENT DISPUTES THEN IN EFFECT OF THE AMERICAN ARBITRATION ASSOCIATION AND (ii) THE FEDERAL ARBITRATION ACT. THE ARBITRATOR SHALL HAVE THE SAME, BUT NO GREATER, REMEDIAL
AUTHORITY AS WOULD A COURT HEARING THE SAME DISPUTE. THE DECISION OF THE ARBITRATOR SHALL BE FINAL, CONCLUSIVE AND BINDING ON THE PARTIES TO THE ARBITRATION AND SHALL BE IN LIEU OF THE RIGHTS THOSE PARTIES MAY OTHERWISE HAVE TO A JURY TRIAL;
PROVIDED, HOWEVER, THAT SUCH DECISION SHALL BE SUBJECT TO CORRECTION, CONFIRMATION OR VACATION IN ACCORDANCE WITH THE PROVISIONS AND STANDARDS OF APPLICABLE LAW GOVERNING THE JUDICIAL REVIEW OF ARBITRATION AWARDS. THE PREVAILING PARTY
IN SUCH ARBITRATION, AS DETERMINED BY THE ARBITRATOR, AND IN ANY ENFORCEMENT OR OTHER COURT PROCEEDINGS, SHALL BE ENTITLED, TO THE EXTENT PERMITTED BY LAW, TO REIMBURSEMENT FROM THE OTHER PARTY FOR ALL OF THE PREVAILING PARTYS COSTS
(PROVIDED, HOWEVER, IF THE CORPORATION IS NOT THE PREVAILING PARTY, THEN THE ARBITRATORS COMPENSATION, FEES AND COSTS SHALL BE PAID BY THE CORPORATION IF SUCH COMPENSATION, FEES AND COSTS ARE REQUIRED TO BE PAID BY THE
CORPORATION IN ACCORDANCE WITH APPLICABLE LAW), EXPENSES AND ATTORNEYS FEES. JUDGMENT SHALL BE ENTERED ON THE



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ARBITRATORS DECISION IN ANY COURT HAVING JURISDICTION OVER THE SUBJECT MATTER OF SUCH DISPUTE OR CONTROVERSY. NOTWITHSTANDING THE FOREGOING, EITHER
PARTY MAY IN AN APPROPRIATE MATTER APPLY TO A COURT PURSUANT TO CALIFORNIA CODE OF CIVIL PROCEDURE SECTION 1281.8, OR ANY COMPARABLE STATUTORY PROVISION OR COMMON LAW PRINCIPLE, FOR PROVISIONAL RELIEF, INCLUDING A TEMPORARY RESTRAINING ORDER OR A
PRELIMINARY INJUNCTION. TO THE EXTENT PERMITTED BY LAW, THE PROCEEDINGS AND RESULTS, INCLUDING THE ARBITRATORS DECISION, SHALL BE KEPT CONFIDENTIAL.

16. Excess Shares. If the Option Shares covered by this Agreement exceed, as of the Grant Date, the number of shares of Common Stock which may without shareholder approval be issued under the Plan, then
this option shall be void with respect to those excess shares, unless shareholder approval of an amendment sufficiently increasing the number of shares of Common Stock issuable under the Plan is obtained in accordance with the provisions of the
Plan.

17. Additional Terms Applicable to an Incentive Option. In the event this option is designated an Incentive Option in
the Grant Notice, the following terms and conditions shall also apply to the grant:

(a) This option shall cease to qualify for favorable
tax treatment as an Incentive Option if (and to the extent) this option is exercised for one or more Option Shares: (A) more than three (3) months after the date Optionee ceases to be an Employee for any reason other than death or
Permanent Disability or (B) more than twelve (12) months after the date Optionee ceases to be an Employee by reason of Permanent Disability.

(b) No installment under this option shall qualify for favorable tax treatment as an Incentive Option if (and to the extent) the aggregate Fair Market Value (determined at the Grant Date) of the Common Stock for which
such installment first becomes exercisable hereunder would, when added to the aggregate value (determined as of the respective date or dates of grant) of the Common Stock or other securities for which this option or any other Incentive Options
granted to Optionee prior to the Grant Date (whether under the Plan or any other option plan of the Corporation or any Parent or Subsidiary) first become exercisable during the same calendar year, exceed One Hundred Thousand Dollars ($100,000) in
the aggregate. Should such One Hundred Thousand Dollar ($100,000) limitation be exceeded in any calendar year, this option shall nevertheless become exercisable for the excess shares in such calendar year as a Non-Statutory Option.

(c) Should the exercisability of this option be accelerated upon a Corporate Transaction, then this option shall qualify for favorable tax treatment as
an Incentive Option only to the extent the aggregate Fair Market Value (determined at the Grant Date) of the Common Stock for which this option first becomes exercisable in the calendar year in which the Corporate Transaction occurs does not, when
added to the aggregate value (determined as of the respective date or dates of grant) of the Common Stock or other securities for which this option or one or more other Incentive Options granted to Optionee prior to the Grant Date (whether



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under the Plan or any other option plan of the Corporation or any Parent or Subsidiary) first become exercisable during the same calendar year, exceed One
Hundred Thousand Dollars ($100,000) in the aggregate. Should the applicable One Hundred Thousand Dollar ($100,000) limitation be exceeded in the calendar year of such Corporate Transaction, the option may nevertheless be exercised for the excess
shares in such calendar year as a Non-Statutory Option.

(d) Should Optionee hold, in addition to this option, one or more other options
to purchase Common Stock which become exercisable for the first time in the same calendar year as this option, then the foregoing limitations on the exercisability of such options as Incentive Options shall be applied on the basis of the order in
which such options are granted.



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EXHIBIT I

NOTICE OF EXERCISE

I hereby notify STEC, Inc. (the Corporation) that I elect to
purchase  shares of the Corporations Common Stock (the Purchased Shares) at the option exercise
price of $  per share (the Exercise Price) pursuant to that certain option (the
Option) granted to me under the Corporations 2000 Stock Incentive Plan on ,
.

Concurrently with the delivery of this Exercise Notice to the Corporation, I
shall hereby pay to the Corporation the Exercise Price for the Purchased Shares in accordance with the provisions of my agreement with the Corporation (or other documents) evidencing the Option and shall deliver whatever additional documents may be
required by such agreement as a condition for exercise. Alternatively, I may utilize the special broker-dealer sale and remittance procedure specified in my agreement to effect payment of the Exercise Price.

,

Date





|                                                                             |  |          |  |  |  | 
|---------------------------------------------------------------------------- |  | -------- |  |  |  | 
|                                                                             |  |          |  | 
|                                                                             |  | Optionee |  |  |  | 
|                                                                             |  |          | 
|                                                                             |  | Address: |  |  |  | 
|                                                                             |  |         
|                                                                             |  |          |  | 
|                                                                             |  |         
|Print name in exact manner it is to appear on the stock certificate:         |  |          |  | 
|                                                                             |  |         
|Address to which certificate is to be sent, if different from address above: |  |          |  | 
|                                                                             |  |         
|                                                                             |  |          |  | 
|                                                                             |  |         
|Social Security Number:                                                      |  |          |  | 



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APPENDIX

The following definitions shall be in effect under the Agreement:

A. Agreement shall mean
this Stock Option Agreement.

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

C. Common Stock shall mean shares of the Corporations common stock.

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

E. Corporate Transaction shall mean either of the following shareholder-approved transactions to which the Corporation is a party:

(i) a merger or consolidation in which securities possessing more than fifty percent (50%) of the total combined
voting power of the Corporations outstanding securities are transferred to a person or persons different from the persons holding those securities immediately prior to such transaction, or

(ii) the sale, transfer or other disposition of all or substantially all of the Corporations assets in complete liquidation or
dissolution of the Corporation.

F. Corporation shall mean STEC, Inc., a California corporation, and any successor
corporation to all or substantially all of the assets or voting stock of STEC, Inc. which shall by appropriate action adopt the Plan.

G.
Employee shall mean an individual who is in the employ of the Corporation (or any Parent or Subsidiary), subject to the control and direction of the employer entity as to both the work to be performed and the manner and method of
performance.

H. Exercise Date shall mean the date on which the option shall have been exercised in accordance with Paragraph
9 of the Agreement.

I. Exercise Price shall mean the exercise price per Option Share as specified in the Grant Notice.

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



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K. Fair Market Value per share of Common Stock on any relevant date shall be determined in
accordance with the following provisions:

(i) If the Common Stock is at the time traded on the Nasdaq National Market, then
the Fair Market Value shall be the closing selling price per share of Common Stock at the close of regular hours trading (i.e., before after-hours trading begins) on the Nasdaq National Market on the date in question, as such price is reported by
the National Association of Securities Dealers. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation
exists.

(ii) If the Common Stock is at the time listed on any Stock Exchange, then the Fair Market Value shall be the
closing selling price per share of Common Stock at the close of regular hours trading (i.e., before after-hours trading begins) on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the
Common Stock, as such price is officially quoted in the composite tape of transactions on such exchange. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price
on the last preceding date for which such quotation exists.

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

M. Grant Notice shall mean the Notice of Grant of Stock Option accompanying the Agreement,
pursuant to which Optionee has been informed of the basic terms of the option evidenced hereby.

N. Incentive Option shall
mean an option which satisfies the requirements of Code Section 422.

O. Misconduct shall mean the commission of any act
of fraud, embezzlement or dishonesty by Optionee, any unauthorized use or disclosure by Optionee of confidential information or trade secrets of the Corporation (or any Parent or Subsidiary), or any other intentional misconduct by Optionee adversely
affecting the business or affairs of the Corporation (or any Parent or Subsidiary) in a material manner. The foregoing definition shall not in any way preclude or restrict the right of the Corporation (or any Parent or Subsidiary) to discharge or
dismiss Optionee or any other person in the Service of the Corporation (or any Parent or Subsidiary) for any other acts or omissions, but such other acts or omissions shall not be deemed, for purposes of the Plan or this Agreement, to constitute
grounds for termination for Misconduct.

P. Non-Statutory Option shall mean an option not intended to satisfy the
requirements of Code Section 422.



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Q. Notice of Exercise shall mean the notice of exercise in the form attached hereto as
Exhibit I.

R. Option Shares shall mean the number of shares of Common Stock subject to the option as specified in the Grant
Notice.

S. Optionee shall mean the person to whom the option is granted as specified in the Grant Notice.

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

U. Permanent Disability or Permanently Disabled shall mean the inability of Optionee to engage
in any substantial gainful activity by reason of any medically determinable physical or mental impairment which is expected to result in death or be of continuous duration of twelve (12) months or more.

V. Plan shall mean the Corporations 2000 Stock Incentive Plan.

W. Plan Administrator shall mean either the Board or a committee of the Board acting in its capacity as administrator of the Plan.

X. Service shall mean the Optionees performance of services for the Corporation (or any Parent or Subsidiary) in the
capacity of an Employee, a non-employee member of the board of directors or a consultant or independent advisor.

Y. Stock
Exchange shall mean the American Stock Exchange or the New York Stock Exchange.

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



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