Document:

NetScaler, Inc. 1997 Stock Plan

 Exhibit 10.15 
 NETSCALER, INC. 
 1997 STOCK PLAN 

adopted on December 10, 1997 
 amended and restated on September 7, 2001 
 amended and restated on
December 17, 2002 (to reflect a 37.23168 to 1 reverse stock split) 
 amended and restated on September 5,
2003, February 27, 2004, December 7, 2004, 
 May 27, 2005 and August 12, 2005

 1. Purposes of the Plan. The purposes of this Stock Plan are to attract and retain the best available personnel
for positions of substantial responsibility, to provide additional incentive to Employees, Directors and Consultants and to promote the success of the Company’s business. Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of grant. Stock Purchase Rights may also be granted under the Plan. 
 2. Definitions. As used herein, the following definitions shall apply: 
 (a)
“Administrator” means the Board or any of its Committees as shall be administering the Plan in accordance with Section 4 hereof. 
 (b) “Applicable Laws” means the requirements relating to the administration of stock option plans 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 other country or jurisdiction where Options or Stock Purchase Rights are granted under the Plan. 

(c) “Board” means the Board of Directors of the Company. 

(d) “Code” means the Internal Revenue Code of 1986, as amended. 

(e) “Committee” means a committee of Directors appointed by the Board in accordance with Section 4 hereof.

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

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

(h) “Consultant” means any natural person who is engaged by the Company or any Parent or Subsidiary to render consulting
or advisory services to such entity and who satisfies the requirements of subsection (c)(1) of Rule 701 under the Securities Act of 1933, as amended. 
 (i) “Director” means a member of the Board of Directors of the Company. 

 (j) “Employee” means any person, including Officers and
Directors, employed by the Company or any Parent or Subsidiary of the Company. A Service Provider shall 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, any Subsidiary, or any successor. For purposes of Incentive Stock Options, no such leave may exceed ninety (90) days, 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, on the
181st day of such leave any Incentive Stock Option held by
the Optionee shall cease to be treated as an Incentive Stock Option and shall be treated for tax purposes as a Nonstatutory Stock Option. Neither service as a Director nor payment of a director’s fee by the Company shall be sufficient to
constitute “employment” by the Company. 
 (k) “Exchange Act” means the Securities Exchange Act of
1934, as amended. 
 (l) “Fair Market Value” means, as of any date, 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 National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its Fair Market Value shall be the closing sales price for such stock (or the closing bid, if no sales were reported) as quoted on such exchange or
system for the last market trading day prior to the time of determination, as reported in The Wall Street Journal or such other source as the Administrator deems reliable; 

(ii) If the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, its Fair Market
Value shall be the mean between the high bid and low asked prices for the Common Stock on the last market trading day prior to the day of determination; or 
 (iii) In the absence of an established market for the Common Stock, the Fair Market Value thereof shall be determined in good faith by the Administrator. 

(m) “Incentive Stock Option” means an Option intended to qualify as an incentive stock option within the meaning of
Section 422 of the Code. 
 (n) “Nonstatutory Stock Option” means an Option not intended to qualify as an
Incentive Stock Option. 
 (o) “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. 
 (p) “Option” means
a stock option granted pursuant to the Plan. 

  
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 (q) “Option Agreement” means a written or electronic agreement between the
Company and an Optionee evidencing the terms and conditions of an individual Option grant. The Option Agreement is subject to the terms and conditions of the Plan. 
 (r) “Option Exchange Program” means a program whereby outstanding Options are exchanged for Options with a lower exercise price. 

(s) “Optioned Stock” means the Common Stock subject to an Option or a Stock Purchase Right. 

(t) “Optionee” means the holder of an outstanding Option or Stock Purchase Right granted under the 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 1997 Stock Plan. 

(w) “Restricted Stock” means shares of Common Stock acquired pursuant to a grant of a Stock Purchase Right under
Section 11 below. 
 (x) “Section 16(b)” means Section 16(b) of the Securities Exchange Act of 1934,
as amended. 
 (y) “Service Provider” means an Employee, Director or Consultant. 

(z) “Share” means a share of the Common Stock, as adjusted in accordance with Section 12 below. 

(aa) “Stock Purchase Right” means a right to purchase Common Stock pursuant to Section 11 below. 

(bb) “Subsidiary” means a “subsidiary corporation,” whether now or hereafter existing, as defined in
Section 424(f) of the Code. 
 3. Stock Subject to the Plan. Subject to the provisions of Section 12 of the
Plan, the maximum aggregate number of Shares which may be subject to option and sold under the Plan is six million six hundred ninety-two thousand (6,692,000) Shares. The Shares may be authorized but unissued, or reacquired Common Stock.

 If an Option or Stock Purchase Right expires or becomes unexercisable without having been exercised in full, or is
surrendered pursuant to an Option Exchange Program, the unpurchased Shares which were subject thereto shall become available for future grant or sale under the Plan (unless the Plan has terminated). However, Shares that have actually been issued
under the Plan, upon exercise of either an Option or Stock Purchase Right, shall not be returned to the Plan and shall not become available for future distribution under the Plan, except that if Shares of Restricted Stock are repurchased by the
Company at their original purchase price, such Shares shall become available for future grant under the Plan. 

  
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 4. Administration of the Plan. 

(a) The Plan shall be administered by the Board or a Committee appointed by the Board, which Committee shall be constituted to comply with
Applicable Laws. 
 (b) Powers of the Administrator. Subject to the provisions of the Plan and, in the case of a
Committee, the specific duties delegated by the Board to such Committee, and subject to the approval of any relevant authorities, the Administrator shall have the authority in its discretion: 

(i) to determine the Fair Market Value; 
 (ii) to select the Service Providers to whom Options and Stock Purchase Rights may from time to time be granted hereunder; 
 (iii) to determine the number of Shares to be covered by each such award granted hereunder; 
 (iv) to approve forms of agreement for use under the Plan; 
 (v) to determine the
terms and conditions, of any Option or Stock Purchase Right granted hereunder. Such terms and conditions include, but are not limited to, the exercise price, the time or times when Options or Stock Purchase Rights 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 Option or Stock Purchase Right or the Common Stock relating thereto, based in each case on such factors as
the Administrator, in its sole discretion, shall determine; 
 (vi) to determine whether and under what circumstances an Option
may be settled in cash under subsection 9(f) instead of Common Stock; 
 (vii) to reduce the exercise price of any Option to
the then current Fair Market Value if the Fair Market Value of the Common Stock covered by such Option has declined since the date the Option was granted; 
 (viii) to initiate an Option Exchange Program; 
 (ix) 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 qualifying for preferred tax treatment under foreign tax laws; 

(x) to allow Optionees to satisfy withholding tax obligations by electing to have the Company withhold from the Shares to be issued upon
exercise of an Option or Stock Purchase Right that number of Shares having a Fair Market Value equal to the amount required to be 

  
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withheld. The Fair Market Value of the Shares to be withheld shall be determined on the date that the amount of tax to be withheld is to be determined. All elections by Optionees to have Shares
withheld for this purpose shall be made in such form and under such conditions as the Administrator may deem necessary or advisable; and 
 (xi) to construe and interpret the terms of the Plan and awards granted pursuant to the Plan. 
 (c) Effect of Administrator’s Decision. All decisions, determinations and interpretations of the Administrator shall be final and binding on all Optionees. 

5. Eligibility. 
 (a) Nonstatutory Stock Options and Stock Purchase Rights may be granted to Service Providers. Incentive Stock Options may be granted only to Employees. 

(b) Each Option shall be designated in the Option Agreement as either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, 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 Optionee during any calendar year (under all plans of the
Company and any Parent or Subsidiary) exceeds $100,000, such Options shall be treated as Nonstatutory Stock Options. For purposes of this Section 5(b), Incentive Stock Options shall be taken into account in the order in which they were granted.
The Fair Market Value of the Shares shall be determined as of the time the Option with respect to such Shares is granted. 
 (c)
Neither the Plan nor any Option or Stock Purchase Right shall confer upon any Optionee any right with respect to continuing the Optionee’s relationship as a Service Provider with the Company, nor shall it interfere in any way with his or her
right or the Company’s right to terminate such relationship at any time, with or without cause. 
 6. Term of Plan.
The Plan shall become effective upon its adoption by the Board. Unless sooner terminated under Section 14, it shall continue in effect for a term of ten (10) years from the later of (i) the effective date of the Plan, or (ii) the
date of the most recent Board approval of an increase in the number of Shares reserved for issuance under the Plan. 
 7.
Term of Option. The term of each Option shall be stated in the Option Agreement; provided, however, that the term shall be no more than ten (10) years from the date of grant thereof. In the case of an Incentive Stock Option granted to an
Optionee who, at the time the 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 term of the Option shall be five (5) years
from the date of grant or such shorter term as may be provided in the Option Agreement. 

  
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 8. Option Exercise Price and Consideration. 

(a) The per share exercise price for the Shares to be issued upon exercise of an Option shall be such price as is determined by the
Administrator, but shall be subject to the following: 
 (i) In the case of an Incentive Stock Option 

(A) granted to an Employee who, at the time of grant of such Option, 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 exercise price shall be no less than 110% of the Fair Market Value per Share on the date of grant. 

(B) granted to any other Employee, the per Share exercise price shall be no less than one hundred percent (100)% of the Fair Market
Value per Share on the date of grant. 
 (ii) In the case of a Nonstatutory Stock Option 

(A) granted to a Service Provider who, at the time of grant of such Option, 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 exercise price shall be no less than one hundred ten (110%) of the Fair Market Value per Share on the date of the grant. 

(B) granted to any other Service Provider, the per Share exercise price shall be no less than eighty five percent (85%) of the Fair
Market Value per Share on the date of grant. 
 (iii) Notwithstanding the foregoing, Options may be granted with a per Share
exercise price other than as required above pursuant to a merger or other corporate transaction. 
 (b) The consideration to be
paid for the Shares to be issued upon exercise of an Option, including the method of payment, shall be determined by the Administrator (and, in the case of an Incentive Stock Option, shall be determined at the time of grant). Such consideration may
consist of (1) cash, (2) check, (3) promissory note, (4) other Shares which (x) in the case of Shares acquired upon exercise of an Option, have been owned by the Optionee for more than six (6) months on the date of
surrender, and (y) have a Fair Market Value on the date of surrender equal to the aggregate exercise price of the Shares as to which such Option shall be exercised, (5) consideration received by the Company under a cashless exercise
program implemented by the Company in connection with the Plan, or (6) any combination of the foregoing methods of payment. In making its determination as to the type of consideration to accept, the Administrator shall consider if acceptance of
such consideration may be reasonably expected to benefit the Company. 

  
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 9. Exercise of Option. 

(a) Procedure for Exercise; Rights as a Shareholder. Any Option granted hereunder shall be exercisable according to the terms
hereof at such times and under such conditions as determined by the Administrator and set forth in the Option Agreement, but in no case at a rate of less than 20% per year over five (5) years from the date the Option is granted. Unless the
Administrator provides otherwise, vesting of Options granted hereunder shall be tolled during any unpaid leave of absence. An Option may not be exercised for a fraction of a Share. 

An Option shall be deemed exercised when the Company receives: (i) written or electronic notice of exercise (in accordance with the
Option Agreement) from the person entitled to exercise the Option, and (ii) full payment for the Shares with respect to which the Option is exercised. Full payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued upon exercise of an Option shall be issued in the name of the Optionee or, if requested by the Optionee, in the name of the Optionee and his or her spouse. Until the
Shares are issued (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), no right to vote or receive dividends or any other rights as a shareholder shall exist with respect to the
Shares, notwithstanding the exercise of the Option. The Company shall issue (or cause to be issued) such Shares promptly after the Option is exercised. 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 12 of the Plan. 
 Exercise of an Option in any manner shall
result in a decrease in the number of Shares thereafter available, both for purposes of the Plan and for sale under the Option, by the number of Shares as to which the Option is exercised. 

(b) Termination of Relationship as a Service Provider. If an Optionee ceases to be a Service Provider, such Optionee may exercise
his or her Option within such period of time as is specified in the Option Agreement (of at least thirty (30) days) 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 the
Option as set forth in the Option Agreement). In the absence of a specified time in the Option Agreement, the Option shall remain exercisable for three (3) months following the Optionee’s termination. If, on the date of termination, the
Optionee is not vested as to his or her entire Option, the Shares covered by the unvested portion of the Option shall revert to the Plan. If, after termination, the Optionee does not exercise his or her Option within the time specified by the
Administrator, the Option shall terminate, and the Shares covered by such Option shall revert to the Plan. 
 (c) Disability
of Optionee. If an Optionee ceases to be a Service Provider as a result of the Optionee’s Disability, the Optionee may exercise his or her Option within such period of time as is specified in the Option 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 Option Agreement). In the absence of a specified time in the Option Agreement, the Option shall remain exercisable for twelve
(12) months following the Optionee’s termination. If such disability is not a “disability” as such term is defined in Section 22(e)(3) of the Code, in the case of an Incentive Stock

  
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Option such Incentive Stock Option shall automatically cease to be treated as an Incentive Stock Option and shall be treated for tax purposes as a Nonstatutory Stock Option on the day three
months and one day following such termination. If, on the date of termination, the Optionee is not vested as to his or her entire Option, the Shares covered by the unvested portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified herein, the Option shall terminate, and the Shares covered by such Option shall revert to the Plan. 
 (d) Death of Optionee. If an Optionee dies while a Service Provider, the Option may be exercised within such period of time as is specified in the Option Agreement (but in no event later than the
expiration of the term of such Option as set forth in the Notice of Grant), by the Optionee’s estate or by a person who acquires the right to exercise the Option by bequest or inheritance, but only to the extent that the Option is vested on the
date of death. In the absence of a specified time in the Option Agreement, the Option shall remain exercisable for twelve (12) months following the Optionee’s termination. If, at the time of death, the Optionee is not vested as to his or
her entire Option, the Shares covered by the unvested portion of the Option shall immediately revert to the Plan. The Option may be exercised by the executor or administrator of the Optionee’s estate or, if none, by the person(s) entitled to
exercise the Option under the Optionee’s will or the laws of descent or distribution. If the Option is not so exercised within the time specified herein, the Option shall terminate, and the Shares covered by such Option shall revert to the
Plan. 
 (e) Buyout Provisions. The Administrator may at any time offer to buy out for a payment in cash or Shares, an
Option previously granted, based on such terms and conditions as the Administrator shall establish and communicate to the Optionee at the time that such offer is made. 
 10. Non-Transferability of Options and Stock Purchase Rights. Options and Stock Purchase Rights 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 Optionee, only by the Optionee. 
 11. Stock Purchase Rights. 
 (a) Rights to Purchase. Stock Purchase
Rights may be issued either alone, in addition to, or in tandem with other awards granted under the Plan and/or cash awards made outside of the Plan. After the Administrator determines that it will offer Stock Purchase Rights under the Plan, it
shall advise the offeree in writing or electronically of the terms, conditions and restrictions related to the offer, including the number of Shares that such person shall be entitled to purchase, the price to be paid, and the time within which such
person must accept such offer. The terms of the offer shall comply in all respects with Section 260.140.42 of Title 10 of the California Code of Regulations. The offer shall be accepted by execution of a Restricted Stock purchase agreement in
the form determined by the Administrator. 
 (b) Repurchase Option. Unless the Administrator determines otherwise, the
Restricted Stock purchase agreement shall grant the Company a repurchase option exercisable upon the voluntary or involuntary termination of the purchaser’s service with the Company for any reason

  
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(including death or disability). The purchase price for Shares repurchased pursuant to the Restricted Stock purchase agreement shall be the original price paid by the purchaser and may be paid by
cancellation of any indebtedness of the purchaser to the Company. The repurchase option shall lapse at such rate as the Administrator may determine, but in no case at a rate of less than 20% per year over five years from the date of purchase.

 (c) Other Provisions. The Restricted Stock purchase agreement shall contain such other terms, provisions and
conditions not inconsistent with the Plan as may be determined by the Administrator in its sole discretion. 
 (d) Rights as
a Shareholder. Once the Stock Purchase Right is exercised, the purchaser shall have rights equivalent to those of a shareholder and shall be a shareholder when his or her purchase is entered upon the records of the duly authorized transfer agent
of the Company. No adjustment shall be made for a dividend or other right for which the record date is prior to the date the Stock Purchase Right is exercised, except as provided in Section 12 of the Plan. 

12. Adjustments Upon Changes in Capitalization, Merger or Asset Sale. 

(a) Changes in Capitalization. Subject to any required action by the shareholders of the Company, the number of shares of Common
Stock covered by each outstanding Option or Stock Purchase Right, and the number of shares of Common Stock which have been authorized for issuance under the Plan but as to which no Options or Stock Purchase Rights have yet been granted or which have
been returned to the Plan upon cancellation or expiration of an Option or Stock Purchase Right, as well as the price per share of Common Stock covered by each such outstanding Option or Stock Purchase Right, shall be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock resulting from a stock split, reverse stock split, stock dividend, combination or reclassification of the Common Stock, or any other increase or decrease in the number of issued
shares of Common Stock effected without receipt of consideration by the Company. The conversion of any convertible securities of the Company shall not be deemed to have been “effected without receipt of consideration.” Such adjustment
shall be made by the Board, whose determination in that respect shall be final, binding and conclusive. Except as expressly provided herein, no issuance by the Company of shares of stock of any class, or securities convertible into shares of stock
of any class, shall affect, and no adjustment by reason thereof shall be made with respect to, the number or price of shares of Common Stock subject to an Option or Stock Purchase Right. 

(b) Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of the Company, the Administrator shall
notify each Optionee as soon as practicable prior to the effective date of such proposed transaction. The Administrator in its discretion may provide for an Optionee to have the right to exercise his or her Option until fifteen (15) days prior
to such transaction as to all of the Optioned Stock covered thereby, including Shares as to which the Option would not otherwise be exercisable. In addition, the Administrator may provide that any Company repurchase option applicable to any Shares
purchased upon exercise of an Option or Stock Purchase Right shall lapse as to all such Shares, provided the proposed dissolution or liquidation takes place at the time and in the manner contemplated. To the extent it has not been previously
exercised, an Option or Stock Purchase Right will terminate immediately prior to the consummation of such proposed action. 

  
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 (c) Merger or Asset Sale. In the event of a merger of the Company with or into
another corporation, or the sale of substantially all of the assets of the Company, each outstanding Option and Stock Purchase Right shall be assumed or an equivalent option or right 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 or Stock Purchase Right, the Optionee shall fully vest in and have the right to exercise the Option or Stock Purchase Right as
to all of the Optioned Stock, including Shares as to which it would not otherwise be vested or exercisable. If an Option or Stock Purchase Right becomes fully vested and exercisable in lieu of assumption or substitution in the event of a merger or
sale of assets, the Administrator shall notify the Optionee in writing or electronically that the Option or Stock Purchase Right shall be fully exercisable for a period of fifteen (15) days from the date of such notice, and the Option or Stock
Purchase Right shall terminate upon the expiration of such period. For the purposes of this paragraph, the Option or Stock Purchase Right shall be considered assumed if, following the merger or sale of assets, the option or right confers the right
to purchase or receive, for each Share of Optioned Stock subject to the Option or Stock Purchase Right immediately prior to the merger or sale of assets, the consideration (whether stock, cash, or other securities or property) received in the merger
or sale of assets 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 merger or sale of assets is not solely common stock of the successor corporation or its Parent, the Administrator may, with the consent of the successor corporation, provide for
the consideration to be received upon the exercise of the Option or Stock Purchase Right, for each Share of Optioned Stock subject to the Option or Stock Purchase Right, to be solely common stock of the successor corporation or its Parent equal in
fair market value to the per share consideration received by holders of Common Stock in the merger or sale of assets. 
 13.
Time of Granting Options and Stock Purchase Rights. The date of grant of an Option or Stock Purchase Right shall, for all purposes, be the date on which the Administrator makes the determination granting such Option or Stock Purchase Right,
or such other date as is determined by the Administrator. Notice of the determination shall be given to each Employee or Consultant to whom an Option or Stock Purchase Right is so granted within a reasonable time after the date of such grant.

 14. Amendment and Termination of the Plan. 
 (a) Amendment and Termination. The Board may at any time amend, alter, suspend or terminate the Plan. 
 (b) Shareholder Approval. The Board shall obtain shareholder approval of any Plan amendment to the extent necessary and desirable to comply with Applicable Laws. 

  
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 (c) Effect of Amendment or Termination. No amendment, alteration, suspension or
termination of the Plan shall impair the rights of any Optionee, unless mutually agreed otherwise between the Optionee and the Administrator, which agreement must be in writing and signed by the Optionee and the Company. Termination of the Plan
shall not affect the Administrator’s ability to exercise the powers granted to it hereunder with respect to Options granted under the Plan prior to the date of such termination. 

15. Conditions Upon Issuance of Shares. 
 (a) Legal Compliance. Shares shall not be issued pursuant to the exercise of an Option unless the exercise of such Option and the issuance and delivery of such Shares shall comply with Applicable
Laws and shall 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 Option, the Administrator 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. 
 16. Inability to Obtain Authority. The inability of the Company to obtain authority from any regulatory body having jurisdiction, which authority is deemed by the Company’s counsel to be
necessary to the lawful issuance and sale of any Shares hereunder, shall relieve the Company of any liability in respect of the failure to issue or sell such Shares as to which such requisite authority shall not have been obtained. 

17. Reservation of Shares. The Company, during the term of this Plan, shall at all times reserve and keep available such number of
Shares as shall be sufficient to satisfy the requirements of the Plan. 
 18. Shareholder Approval. The Plan shall be
subject to approval by the shareholders of the Company within twelve (12) months after the date the Plan is adopted. Such shareholder approval shall be obtained in the degree and manner required under Applicable Laws. 

19. Information to Optionees and Purchasers. The Company shall provide to each Optionee and to each individual who acquires Shares
pursuant to the Plan, not less frequently than annually during the period such Optionee or purchaser has one or more Options or Stock Purchase Rights outstanding, and, in the case of an individual who acquires Shares pursuant to the Plan, during the
period such individual owns such Shares, copies of annual financial statements. The Company shall not be required to provide such statements to key employees whose duties in connection with the Company assure their access to equivalent information.

 20. No Further Grants. Effective upon the Effective Time (as such term is defined in that certain Agreement and Plan
of Merger, dated as of June 1, 2005, as amended, by and among the Company, Citrix Systems, Inc. (“Citrix”), NCAR Acquisition Corporation, a wholly-owned 

  
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subsidiary of Citrix, NCAR LLC, a wholly-owned subsidiary of Citrix, and the stockholder representative (the “Merger Agreement”)), no further grants of Options or Stock Purchase
Rights shall be made pursuant to this Stock Plan. 
 21. No Repricing of Options or Stock Purchase Rights. Effective upon
the Effective Time (as such term is defined in the Merger Agreement), no Options or Stock Purchase Rights granted under this Stock Plan shall be repriced, or terminated and subsequently regranted, at a lower exercise price per share than that
applicable to the original grant (as adjusted pursuant to the terms of the Merger Agreement) without the prior affirmative vote of a majority of the shares of stock of Citrix present at a stockholders’ meeting in person or by proxy and entitled
to vote thereon. 

  
 -12-Form of Series 10 Preferred Stock Certificate

 Exhibit 4.1 

 

					
	Number P10-        	  	CELL THERAPEUTICS, INC.	  	*                    * Shares
		  	A Washington Corporation	  	Series 10 Preferred Stock

 THIS CERTIFIES THAT
*                                        
                                         
                                       * is the
record holder of
*                                        
                                         
                   (                     
                                   )* shares of
Series 10 Preferred Stock of Cell Therapeutics, Inc. (the “Corporation”) transferable only on the share register of the Corporation by the holder, in person or by such holder’s duly authorized attorney,
upon surrender of this certificate properly endorsed or assigned. 
 This certificate and the shares represented hereby shall be
held subject to all of the provisions of the Amended and Restated Articles of Incorporation and the Second Amended and Restated Bylaws of the Corporation and any amendments thereto, a copy of each of which is on file at the office of the Corporation
and made a part hereof as fully as though the provisions of said Amended and Restated Articles of Incorporation and Second Amended and Restated Bylaws were imprinted in full on this Certificate, to all of which the holder of this Certificate, by
acceptance hereof, assents and agrees to be bound. 
 The Corporation will furnish without charge to each shareholder who so
requests, the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock or series thereof and the qualifications, limitations or restrictions of such preferences or rights. 

IN WITNESS WHEREOF, the Corporation has caused this Certificate to be signed by its duly authorized officers this
     day of             , 2011. 
  

					
	  
	 		  	  

	James A. Bianco, Chief Executive Officer	 		  	Louis A. Bianco, Executive Vice President, Finance and Administration

 FOR VALUE RECEIVED, THE UNDERSIGNED HEREBY SELLS, ASSIGNS AND TRANSFERS UNTO
                                         
                                        
                                         
     SHARES REPRESENTED BY THE WITHIN CERTIFICATE AND DOES HEREBY IRREVOCABLY CONSTITUTE AND APPOINT
                                 ATTORNEY TO TRANSFER THE SAID SHARES ON THE SHARE
REGISTER OF THE WITHIN NAMED CORPORATION WITH FULL POWER OF SUBSTITUTION IN THE PREMISES. 

DATED                     

 

	
	  

	(Signature)

 NOTICE: THE SIGNATURE ON THIS ASSIGNMENT
MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THIS CERTIFICATE, IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER.

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