Document:

LETTER AGREEMENT DATED AS OF FEBRUARY 12,2004

 Exhibit 10.25 
  
 Mr. J. Michael Gearon
                                        
                        February 12, 2004 
 c/o American Tower Corporation 
 116 Huntington Avenue 
 Boston, MA 02116 
  
 Dear Michael: 
  
 As a team, we have accomplished a lot. You continue to make a great
contribution and I very much enjoy working with you. As we look toward building the future of the company together, I want to confirm the terms of the relationship between the company and yourself: 
  
 Cash Compensation 
  
 As of January 1, 2004 your annualized base salary was increased to four
hundred twelve thousand, five hundred dollars ($412,500.00) and your target cash bonus for 2004 will be one hundred sixty five thousand dollars ($165,000.00), 40% of your base salary. Thereafter, future salary and bonus targets will be as
recommended by me to the Compensation Committee. 
  
 Long Term
Equity Incentive 
  
 For 2003, you will be awarded 520,000
options under the ATC Tower Systems, Inc. 1997 Stock Plan (as amended and restated on April 27, 1998, and as further amended on March 9, 2000) (the “Stock Plan”). Future grants of equity-based incentives will be as recommended by me to the
Compensation Committee. 
  
 Perquisites and Benefits

  
 You will continue to be eligible for all executive
benefits to the same extent as other similarly situated executives which include a $1,000 per month automobile allowance and reimbursement of your annual insurance premium for one automobile. 
  
 Severance 
  
 If your employment with the company is at any time terminated other than for
Cause, or if you decide to leave the company for Good Reason, you will receive the following benefits: 
  

	 	a.	Bi-weekly payment of then-current salary prior to any material reduction, if any, for 18 months after the date of termination and pro-rated target bonus; 

	 	b.	Company paid medical and dental benefits for 18 months following your termination which will run concurrent with COBRA coverage. 

  

	 	c.	Gross-up for excise tax, and any federal and state income or other taxes on the gross-up payment (the “Gross Up”), so that you are held harmless, on an after tax basis
from the application of the excise tax in the event thatyou receive or are deemed to receivepaymentsor benefits from the company or an affiliate of thecompany, including severance payments and other payments or benefits (“Severance
Payments”), which constitute “parachute payments” within the meaning of Sections 280G and 4999 of the Internal Revenue Code (“Code”) and trigger excise taxes. In addition, you will be entitled to the gross-up benefit defined
in this item “c” of the Severance Benefit as a result of any accelerated vesting of any or all of your options regardless of whether your employment with the Company is terminated. 

  
 Furthermore, in the event your employment terminates for any reason other
than for Cause, your rights to participate in the Stock Plan will continue for the duration of the vesting period of your then existing options provided however, that this is accomplished through a mutually acceptable arrangement. 
  
 “Cause” is defined as willful or gross non-performance of duties or
deliberate actions (including fraud) that reasonably could be expected to materially and adversely affect the company, as determined in good faith by the ATC Board of Directors after notice and an opportunity to cure has been provided to you.
“Good Reason” is defined as termination by you of your employment at any time within ninety days after (i) a material reduction in your responsibility from your current role (ii) a material reduction in your cash compensation or benefits
(iii) a material change in, or termination of, this severance arrangement or (iv) an unreasonable relocation of your principal office of more than fifty miles from your existing principal office without your consent. 
  
 The aforementioned severance benefits are contingent on reaching a Separation
and Release Agreement between you and the company that would include customary and reasonable release, non-compete, non-solicitation and non-disparagement clauses in effect for a period of twelve months. 
  
 It’s been an exciting and successful run that we’ve had together so
far. I’m looking forward to delivering even more accomplishments from our team in the future and serving our customers, financial stake holders, and employees with excellence. 
  
 Best Regards, 
 /s/ James Taiclet 
 James Taiclet 
 Chief Executive Officer 
  
 Accepted    /s/ J. Michael GearonICOS CORPORATION 1999 STOCK OPTION PLAN

 Exhibit 10.3 
  
 ICOS CORPORATION 
  
 1999 STOCK OPTION PLAN 
  
 (as amended and restated on January 21, 2004) 
  
 SECTION 1. PURPOSE 
  
 The purpose of the ICOS Corporation 1999 Stock Option Plan (the “Plan”) is to enhance the long-term stockholder value of ICOS Corporation, a
Delaware corporation (the “Company”), by offering opportunities to selected persons to participate in the Company’s growth and success, and to encourage them to remain in the service of the Company and its Related Corporations (as
defined in Section 2) and to acquire and maintain stock ownership in the Company. 
  
 SECTION 2. DEFINITIONS 
  
 For purposes of the Plan, the following terms shall be defined as set forth below: 
  
 “Board” means the Board of Directors of the Company. 
  
 “Cause” means dishonesty, fraud, misconduct, unauthorized use or disclosure of confidential information or trade secrets, or conviction
or confession of a crime punishable by law (except minor violations), in each case as determined by the Plan Administrator, and its determination shall be conclusive and binding. 
  
 “Code” means the Internal Revenue Code of 1986, as amended from time to time. 
  
 “Common Stock” means the common stock, par value $.01 per
share, of the Company. 
  
 “Corporate
Transaction” has the meaning set forth in Section 11.2 
  
 “Disability,” unless otherwise defined by the Plan Administrator, means a mental or physical impairment of the Participant that is expected to result in death or that has lasted or is expected to last for a
continuous period of 12 months or more and that causes the Participant to be unable, in the opinion of the Company, to perform his or her duties for the Company or a Related Corporation and to be engaged in any substantial gainful
activity. 
  
 “Effective Date”
means the date on which the Plan is adopted by the Board, so long as it is approved by the Company’s stockholders at any time within 12 months of such adoption. 
  
 “Exchange Act” means the Securities Exchange Act of 1934, as amended. 
  
 “Fair Market Value” shall be as established in good faith by
the Plan Administrator or (a) if the Common Stock is listed on the Nasdaq National Market, the closing selling price for the Common Stock as reported by the Nasdaq National Market for a single trading day or (b) if the Common Stock is listed on the
New York Stock Exchange or the American Stock Exchange, the closing selling price for the Common Stock as such price is officially quoted in the composite 

 tape of transactions on such exchange for a single trading day; provided, however, that if there is no such reported
price for the Common Stock for the date in question, then such price on the last preceding date for which such price exists shall be determinative of Fair Market Value. 
  
 “Good Reason” means the occurrence of any of the following events or conditions: 
  
 (a) the assignment to the Participant of any duties materially inconsistent
with the Participant’s position, authority, duties or responsibilities as in effect immediately prior to a Corporate Transaction or any other action by the successor corporation which results in a material diminution in such position,
authority, duties or responsibilities, excluding for this purpose an isolated and inadvertent action not taken in bad faith and which is remedied by the successor corporation promptly after receipt of notice thereof given by the Participant;

  
 (b) a reduction in the Participant’s annual base salary;

  
 (c) the successor corporation’s requiring the Participant
(without the Participant’s consent) to be based at any place outside a 35-mile radius of his or her place of employment prior to a Corporate Transaction, except for reasonably required travel on the successor corporation’s business that is
not materially greater than such travel requirements prior to the Corporate Transaction; 
  
 (d) the successor corporation’s failure to provide the Participant with compensation and benefits at least equal in the aggregate (in terms of benefit levels and/or reward opportunities) to those provided for
under any employee benefit plan, program or practice as in effect immediately prior to the Corporate Transaction, except for changes in general welfare and benefit plans in a manner consistent with similar plans applicable to the employees of the
successor corporation and its affiliates in general, which changes on the whole (after consideration of any additional benefits provided after the consummation of the Corporate Transaction) are not material decreases; or 
  
 (e) any material breach by the successor corporation of its obligation to
Participant under the Plan. 
  
 “Grant
Date” means the date on which the Plan Administrator completes the corporate action relating to the grant of an Option and all conditions precedent to the grant have been satisfied, provided that conditions to the exercisability or vesting
of Options shall not defer the Grant Date. 
  
 “Incentive
Stock Option” means an Option to purchase Common Stock granted under Section 7 with the intention that it qualify as an “incentive stock option” as that term is defined in Section 422 of the Code. 
  
 “Nonqualified Stock Option” means an Option to purchase
Common Stock granted under Section 7 other than an Incentive Stock Option. 
  
 “Option” means the right to purchase Common Stock granted under Section 7. 
  

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 “Option Term” has the meaning set forth in Section 7.3. 
  
 “Parent,” except as otherwise provided in Section 8.4
in connection with Incentive Stock Options, means any entity, whether now or hereafter existing, that directly or indirectly controls the Company. 
  
 “Participant” means (a) the person to whom an Option is granted; (b) for a Participant who has died, the personal representative of the
Participant’s estate, the person(s) to whom the Participant’s rights under the Option have passed by will or by the applicable laws of descent and distribution, or the beneficiary designated in accordance with Section 10; or (c) the
person(s) to whom an Option has been transferred in accordance with Section 10. 
  
 “Plan Administrator” means the Board or any committee or committees designated by the Board to administer the Plan under Section 3.1. 
  
 “Related Corporation” means any Parent or Subsidiary of the Company. 
  
 “Retirement” means retirement as of the individual’s
normal retirement date under the Company’s 401(k) Plan or other similar successor plan applicable to salaried employees, unless otherwise defined by the Plan Administrator from time to time for purposes of the Plan. 
  
 “Securities Act” means the Securities Act of 1933, as
amended. 
  
 “Subsidiary,” except as
provided in Section 8.4 in connection with Incentive Stock Options, means any entity that is directly or indirectly controlled by the Company. 
  
 “Termination Date” has the meaning set forth in Section 7.6. 
  
 SECTION 3. ADMINISTRATION 
  
 3.1 Plan Administrator 
  
 The Plan shall be administered by the Board and/or a committee or committees (which term includes subcommittees) appointed by, and consisting of two or
more members of, the Board (a “Plan Administrator”). If and so long as the Common Stock is registered under Section 12(b) or 12(g) of the Exchange Act, the Board shall consider in selecting the members of any committee acting as Plan
Administrator, with respect to any persons subject or likely to become subject to Section 16 of the Exchange Act, the provisions regarding (a) ”outside directors” as contemplated by Section 162(m) of the Code and (b) ”nonemployee
directors” as contemplated by Rule 16b-3 under the Exchange Act. Notwithstanding the foregoing, the Board may delegate the responsibility for administering the Plan with respect to designated classes of eligible persons to different committees
consisting of one or more members of the Board, subject to such limitations as the Board deems appropriate. Committee members shall serve for such term as the Board may determine, subject to removal by the Board at any time. To the extent consistent
with applicable law, the Plan Administrator may authorize one or more officers of the Company to grant Options to designated classes of eligible persons, within the limits specifically prescribed by the Plan Administrator. 
  

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 3.2 Administration and Interpretation by Plan Administrator 
  
 Except for the terms and conditions explicitly set forth in the Plan, the
Plan Administrator shall have exclusive authority, in its discretion, to determine all matters relating to Options under the Plan, including the selection of individuals to be granted Options, the type of Options, the number of shares of Common
Stock subject to an Option, all terms, conditions, restrictions and limitations, if any, of an Option and the terms of any instrument that evidences the Option. The Plan Administrator shall also have exclusive authority to interpret the Plan and the
terms of any instrument evidencing the Option and may from time to time adopt, and change, rules and regulations of general application for the Plan’s administration. The Plan Administrator’s interpretation of the Plan and its rules and
regulations, and all actions taken and determinations made by the Plan Administrator pursuant to the Plan, shall be conclusive and binding on all parties involved or affected. The Plan Administrator may delegate administrative duties to such of the
Company’s officers as it so determines. 
  
 SECTION 4.
STOCK SUBJECT TO THE PLAN 
  
 4.1 Authorized Number of Shares

  
 Subject to adjustment from time to time as provided in
Section 11.1, the number of shares of Common Stock that shall be available for issuance under the Plan shall be 10,000,000 shares. 
  
 In addition, (a) any authorized shares not issued or subject to outstanding options under the Company’s 1989 Stock Option Plan or its 1991 Stock
Option Plan for Nonemployee Directors (the “Prior Plans”) on the Effective Date and (b) any shares subject to outstanding options under the Prior Plans on the Effective Date that cease to be subject to such options (other than by reason of
exercise of the options to the extent they are exercised for shares), up to an aggregate maximum of 7,412,048 shares, shall, as of the date of stockholder approval of the Plan, cease to be available for grant and issuance under the Prior Plans, but
shall be available for issuance under the Plan. 
  
 Shares issued under the Plan shall be drawn from authorized and unissued shares or shares now held or subsequently acquired by the Company as treasury shares. 
  
 4.2 Limitations 
  
 Subject to adjustment from time to time as provided in Section 11.1, not more than 2,500,000 shares of Common Stock may be made subject to Options
under the Plan to any individual in the aggregate in any consecutive three year period, such limitation to be applied in a manner consistent with the requirements of, and only to the extent required for compliance with, the exclusion from the
limitation on deductibility of compensation under Section 162(m) of the Code. 
  
 4.3 Reuse of Shares 
  
 Any shares of Common
Stock that have been made subject to an Option that cease to be subject to the Option (other than by reason of exercise of the Option to the extent it is exercised 
  

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 for shares) shall again be available for issuance in connection with future grants of Options under the Plan; provided,
however, that for purposes of Section 4.2, any such shares shall be counted in accordance with the requirements of Section 162(m) of the Code. 
  
 If an optionee pays the exercise price of an Option by surrendering previously owned shares in accordance with Section 7.5(b) and/or, as permitted by the
Plan Administrator, pays any withholding tax obligation with respect to an Option by electing to have shares withheld or surrendering previously owned shares, in accordance with Sections 9(b) or (c), the surrendered shares and the shares withheld to
pay taxes shall be available for issuance under the Plan and shall not count toward the maximum number of shares that may be issued under the Plan as set forth in Section 4.1. Notwithstanding the foregoing, the maximum number of shares of Common
Stock that may be granted in the form of Incentive Stock Options shall not exceed 12,412,048. 
  
 SECTION 5. ELIGIBILITY 
  
 Options may be granted under the Plan to those officers, directors and employees of the Company and its Related Corporations as the Plan Administrator from time to time selects. Options may also be made to consultants, agents, advisors and
independent contractors who provide services to the Company and its Related Corporations; provided, however, that such Participants render bona fide services not in connection with the offer and sale of the Company’s securities in a
capital-raising transaction. 
  
 SECTION 6. SETTLEMENT OF
OPTIONS AND 
 ACQUIRED COMPANY OPTIONS 
  
 6.1 Settlement of Options 
  
 The Company may settle Options through the delivery of shares of Common Stock, cash payments, the granting of replacement Options or any combination
thereof as the Plan Administrator shall determine. Any Option settlement, including payment deferrals, may be subject to such conditions, restrictions and contingencies as the Plan Administrator shall determine. The Plan Administrator may permit or
require the deferral of any Option payment, subject to such rules and procedures as it may establish, which may include provisions for the payment or crediting of interest, or dividend equivalents, including converting such credits into deferred
stock equivalents. The Plan Administrator may at any time offer to buy out, for a payment in cash or Common Stock, an Option previously granted based on such terms and conditions as the Plan Administrator shall establish and communicate to the
Participant at the time such offer is made. 
  
 6.2 Acquired Company Options

  
 Notwithstanding anything in the Plan to the contrary, the
Plan Administrator may grant Options under the Plan in substitution for options issued under other plans, or assume under the Plan options issued under other plans, if the other plans are or were plans of other acquired entities (“Acquired
Entities”) (or the parent of the Acquired Entity) and the new Option is substituted, or the old option is assumed, by reason of a merger, consolidation, acquisition of property or of stock, reorganization or liquidation (the “Acquisition
Transaction”). In the event 
  

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 that a written agreement pursuant to which the Acquisition Transaction is completed is approved by the Board and said
agreement sets forth the terms and conditions of the substitution for or assumption of outstanding options of the Acquired Entity, said terms and conditions shall be deemed to be the action of the Plan Administrator without any further action by the
Plan Administrator, except as may be required for compliance with Rule 16b-3 under the Exchange Act, and the persons holding such options shall be deemed to be Participants. 
  
 SECTION 7. TERMS AND CONDITIONS OF OPTIONS 
  
 7.1 Grant of Options 
  
 The Plan Administrator is authorized under the Plan, in its sole discretion, to issue Options as Incentive Stock Options or as Nonqualified Stock Options,
which shall be appropriately designated. Options may be granted singly or in combination. 
  
 7.2 Option Exercise Price 
  
 The exercise price for shares purchased under an Option shall be as determined by the Plan Administrator, but shall not be less than 100% of the Fair Market Value of the Common Stock on the Grant Date with respect to Incentive Stock Options
and not less than 85% of the Fair Market Value of the Common Stock on the Grant Date with respect to Nonqualified Stock Options. For Incentive Stock Options granted to a more than 10% stockholder, the Option exercise price shall be as specified in
Section 8.2. 
  
 7.3 Term of Options 
  
 The term of each Option (the “Option Term”) shall be as
established by the Plan Administrator or, if not so established, shall be ten years from the Grant Date. For Incentive Stock Options, the maximum Option Term shall be as specified in Sections 8.2 and 8.5. 
  
 7.4 Exercise of Options 
  
 The Plan Administrator shall establish and set forth in each instrument that evidences an Option the time at which, or the
installments in which, the Option shall vest and become exercisable, which provisions may be waived or modified by the Plan Administrator at any time. If not so established in the instrument evidencing the Option, the Option shall vest and become
exercisable according to the following schedule, which may be waived or modified by the Plan Administrator at any time: 
  

			
	 Period of Participant’s Continuous
 Employment or Service With the Company
 or Its Related Corporations From
the
 Option Grant Date

	 	 Percent of Total Option
 That Is Vested and Exercisable

	 After 1 month
	 	1/48th
		
	 Each additional one-month period of continuous service completed thereafter
	 	An additional 1/48th
		
	 After 4 years
	 	100%

  

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 Unless the Plan Administrator (or the Company’s Chief Executive Officer in the case of Participants
who are not subject to Section 16 of the Exchange Act) determines otherwise, the vesting schedule of an Option shall be adjusted proportionately to the extent a Participant’s hours of employment or service are reduced after the Grant Date.

  
 To the extent that the Option has vested and become
exercisable, an Option may be exercised from time to time by delivery to the Company of a written stock option exercise agreement or notice, in a form and in accordance with procedures established by the Plan Administrator, setting forth the number
of shares with respect to which the Option is being exercised, the restrictions imposed on the shares purchased under such exercise agreement, if any, and such representations and agreements as may be required by the Plan Administrator, accompanied
by payment in full as described in Section 7.5. An Option may not be exercised as to less than a reasonable number of shares at any one time, as determined by the Plan Administrator. 
  
 7.5 Payment of Exercise Price 
  
 The exercise price for shares purchased under an Option shall be paid in
full to the Company by delivery of consideration equal to the product of the Option exercise price and the number of shares purchased. Such consideration must be paid in cash or by check or, unless the Plan Administrator in its sole discretion
determines otherwise, either at the time the Option is granted or at any time thereafter, in any combination of 
  
 (a) cash or check; 
  
 (b) tendering (either actually or, if and so long as the Common Stock is registered under Section 12(b) or 12(g) of the Exchange Act, by attestation)
shares of Common Stock already owned by the Participant for at least six months (or any shorter period necessary to avoid a charge to the Company’s earnings for financial reporting purposes) having a Fair Market Value on the day prior to the
exercise date equal in amount to the aggregate Option exercise price; 
  
 (c) if and so long as the Common Stock is registered under Section 12(b) or 12(g) of the Exchange Act, delivery of a properly executed exercise notice, together with irrevocable instructions, to (i) a brokerage firm designated by the
Company to deliver promptly to the Company the aggregate amount of sale or loan proceeds to pay the Option exercise price and any withholding tax obligations that may arise in connection with the exercise and (ii) the Company to deliver the
certificates for such purchased shares directly to such brokerage firm, all in accordance with the regulations of the Federal Reserve Board; or 
  
 (d) such other consideration as the Plan Administrator may permit. 
  
 In addition, to assist a Participant (including a Participant who is an officer or a director of the Company) in acquiring
shares of Common Stock pursuant to an Option granted under the 
  

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 Plan, the Plan Administrator, in its sole discretion, may authorize, either at the Grant Date or at any time before the
acquisition of Common Stock pursuant to the Option, (i) the payment by a Participant of a full-recourse promissory note, (ii) the payment by the Participant of the purchase price, if any, of the Common Stock in installments, or (iii) the guarantee
by the Company of a loan obtained by the Participant from a third party. Subject to the foregoing, the Plan Administrator shall in its sole discretion specify the terms of any loans, installment payments or loan guarantees, including the interest
rate and terms of and security for repayment. 
  
 7.6
Post-Termination Exercises 
  
 The Plan Administrator shall
establish and set forth in each instrument that evidences an Option whether the Option shall continue to be exercisable, and the terms and conditions of such exercise, if a Participant ceases to be employed by, or to provide services to, the Company
or its Related Corporations, which provisions may be waived or modified by the Plan Administrator at any time. If not so established in the instrument evidencing the Option, the Option shall be exercisable according to the following terms and
conditions, which may be waived or modified by the Plan Administrator at any time: 
  
 (a) Any portion of an Option that is not vested and exercisable on the date of termination of the Participant’s employment or service relationship (the “Termination Date”) shall expire on such date.

  
 (b) Any portion of an Option that is vested and exercisable on
the Termination Date shall expire upon the earliest to occur of 
  
 (i) the last day of the Option Term; 
  
 (ii) if the
Participant’s Termination Date occurs for reasons other than Cause, death, Disability or Retirement, the three-month anniversary of such Termination Date; 
  

(iii) if the Participant’s Termination Date occurs by reason of death or Disability, the one-year anniversary of such Termination Date; and

  
 (iv) if the Participant’s Termination Date occurs by
reason of Retirement, the three-year anniversary of such Termination Date. 
  
 Notwithstanding the foregoing, if the Participant dies after the Termination Date while the Option is otherwise exercisable, the portion of the Option that is vested and exercisable on such Termination Date shall
expire upon the earlier to occur of (y) the last day of the Option Term and (z) the first anniversary of the date of death, unless the Plan Administrator determines otherwise. 
  
 Also notwithstanding the foregoing, in case of termination of the Participant’s employment or service relationship for
Cause, the Option shall automatically expire upon first notification to the Participant of such termination, unless the Plan Administrator determines otherwise. If a Participant’s employment or service relationship with the Company is suspended
pending an investigation of whether the Participant shall be terminated for Cause, all the Participant’s rights under any Option likewise shall be suspended during the period of investigation. 
  

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 A Participant’s transfer of employment or service relationship between or among the Company and its
Related Corporations, or a change in status from an employee to a consultant that is evidenced by a written agreement between a Participant and the Company or a Related Corporation, shall not be considered a termination of employment or service
relationship for purposes of this Section 7. Employment or service relationship shall be deemed to continue while the Participant is on a bona fide leave of absence, if such leave was approved by the Company or a Related Corporation in
writing and if continued crediting of service for purposes of this Section 7 is expressly required by the terms of such leave or by applicable law (as determined by the Company). The effect of a Company-approved leave of absence on the terms and
conditions of an Option shall be determined by the Plan Administrator, in its sole discretion. 
  
 SECTION 8. INCENTIVE STOCK OPTION LIMITATIONS 
  
 To the extent required by Section 422 of the Code, Incentive Stock Options shall be subject to the following additional terms and conditions: 
  
 8.1 Dollar Limitation 
  
 To the extent the aggregate Fair Market Value (determined as of the Grant Date) of Common Stock with respect to which Incentive Stock Options are
exercisable for the first time during any calendar year (under the Plan and all other stock option plans of the Company) exceeds $100,000, such portion in excess of $100,000 shall be treated as a Nonqualified Stock Option. In the event the
Participant holds two or more such Options that become exercisable for the first time in the same calendar year, such limitation shall be applied on the basis of the order in which such Options are granted. 
  
 8.2 More Than 10% Stockholders 
  
 If an employee owns more than 10% of the total voting power of all classes
of the Company’s stock, then the exercise price per share of an Incentive Stock Option shall not be less than 110% of the Fair Market Value of the Common Stock on the Grant Date and the Option Term shall not exceed five years. The determination
of more than 10% ownership shall be made in accordance with Section 422 of the Code. 
  
 8.3 Attribution Rule 
  
 For purposes of Section
8.2, in determining stock ownership, an employee shall be deemed to own the stock owned, directly or indirectly, by or for his or her brothers, sisters, spouse, ancestors and lineal descendants. Stock owned, directly or indirectly, by or for a
corporation, partnership, estate or trust shall be deemed to be owned proportionately by or for its stockholders, partners or beneficiaries. If an employee or a person related to the employee owns an unexercised option or warrant to purchase stock
of the Company, the stock subject to that portion of the option or warrant which is unexercised shall not be counted in determining stock ownership. For purposes of this Section 8, stock owned by an employee shall include all stock actually issued
and outstanding immediately before the grant of the Incentive Stock Option to the employee. 
  

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 8.4 Eligible Employees 
  

Individuals who are not employees of the Company or one of its parent corporations or subsidiary corporations may not be granted Incentive Stock
Options. For purposes of this Section 8.4, “parent corporation” and “subsidiary corporation” shall have the meanings attributed to those terms for purposes of Section 422 of the Code. 
  
 8.5 Term 
  
 Except as provided in Section 8.2, the Option Term shall not exceed 10 years. 
  
 8.6 Exercisability 
  
 An Option designated as an Incentive Stock Option shall cease to qualify for favorable tax treatment as an Incentive Stock
Option to the extent it is exercised (if permitted by the terms of the Option) (a) more than three months after the Termination Date for reasons other than death or Disability, (b) more than one year after the Termination Date by reason of
Disability, or (c) after the Participant has been on leave of absence for more than 90 days, unless the Participant’s reemployment rights are guaranteed by statute or contract. 
  
 For purposes of this Section 8.6, Disability shall mean “disability” as that term is defined for purposes of
Section 422 of the Code. 
  
 8.7 Taxation of Incentive Stock Options

  
 In order to obtain certain tax benefits afforded to
Incentive Stock Options under Section 422 of the Code, the Participant must hold the shares issued upon the exercise of an Incentive Stock Option for two years after the Grant Date and one year from the date of exercise. A Participant may be subject
to the alternative minimum tax at the time of exercise of an Incentive Stock Option. The Participant shall give the Company prompt notice of any disposition of shares acquired by the exercise of an Incentive Stock Option prior to the expiration of
such holding periods. 
  
 8.8 Promissory Notes 
  
 The amount of any promissory note delivered pursuant to Section 7.5 in
connection with an Incentive Stock Option shall bear interest at a rate specified by the Plan Administrator, but in no case less than the rate required to avoid imputation of interest (taking into account any exceptions to the imputed interest
rules) for federal income tax purposes. 
  
 SECTION 9.
WITHHOLDING 
  
 The Company may require the Participant to pay
to the Company the amount of any withholding taxes that the Company is required to withhold with respect to the grant, vesting or 
  

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 exercise of any Option. Subject to the Plan and applicable law, the Plan Administrator may, in its sole discretion,
permit the Participant to satisfy withholding obligations, in whole or in part, (a) by paying cash, (b) by electing to have the Company withhold shares of Common Stock (up to the minimum required federal tax withholding rate) or (c) by transferring
to the Company shares of Common Stock (already owned by the Participant for such period necessary to avoid a charge to the Company’s earnings for financial reporting purposes), in such amounts as are equivalent to the Fair Market Value of the
withholding obligation. The Company shall have the right to withhold from any Option or any shares of Common Stock issuable pursuant to an Option (up to the minimum required federal tax withholding rate) or from any cash amounts otherwise due or to
become due from the Company to the Participant an amount equal to such taxes. The Company may also deduct from any Option any other amounts due from the Participant to the Company or a Related Corporation. 
  
 SECTION 10. ASSIGNABILITY 
  
 Options granted under the Plan shall not be transferable, pledgable or
assignable other than (a) by will or the laws of descent and distribution or (b) to the extent permitted by the Plan Administrator, in its sole discretion, and by Section 422 of the Code with respect to Incentive Stock Options, by gift or other
transfer to either (i) any trust or partnership in which the original option recipient or such person’s spouse or other immediate family member has a substantial beneficial interest or (ii) a spouse or other immediate family member; provided,
however, that any Option so assigned or transferred shall be subject to all the same terms and conditions contained in the instrument evidencing the Option. During a Participant’s lifetime, any Options granted under the Plan are personal to the
Participant and are exercisable solely by the Participant or a permitted assignee or transferee. Notwithstanding the foregoing, to the extent permitted by Section 422 of the Code with respect to Incentive Stock Options, the Plan Administrator may
permit a Participant, during the Participant’s lifetime, to designate a person who may exercise an Option after the Participant’s death by giving written notice of such designation to the Company (such designation may be changed from time
to time by the Participant by giving written notice to the Company revoking any earlier designation and making a new designation). Any attempt to transfer, assign, pledge, hypothecate or otherwise dispose of any Option under the Plan or of any right
or privilege conferred thereby, contrary to the provisions of the Plan, or the sale or levy or any attachment or similar process upon the rights and privileges conferred hereby, shall be null and void. 
  
 SECTION 11. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION

  
 11.1 Adjustment of Shares 
  
 The aggregate number and class of shares for which Options may be
granted under the Plan, the number and class of shares covered by each outstanding Option and the exercise price per share thereof (but not the total price), and the limitations set forth in Section 4.2, shall all be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock of the Company resulting from a split-up or consolidation of shares or any like capital adjustment, or the payment of any stock dividend. 
  

 -11- 

 11.2 Effect of Liquidation, Reorganization or Change in Control 
  
 (a) Except as provided in subsection 11.2(b), upon a merger (other than a
merger of the Company in which the holders of Common Stock immediately prior to the merger have the same proportionate ownership of common stock in the surviving corporation immediately after the merger), consolidation, acquisition of property or
stock, separation, reorganization (other than a mere reincorporation or the creation of a holding company) or liquidation of the Company, as a result of which the stockholders of the Company receive cash, stock or other property in exchange for or
in connection with their shares of Common Stock, any Option granted hereunder shall terminate, but the Participant shall have the right immediately prior to any such merger, consolidation, acquisition of property or stock, separation, reorganization
or liquidation to exercise such Participant’s Option in whole or in part whether or not the vesting requirements set forth in the Option agreement have been satisfied. 
  
 (b) If the stockholders of the Company receive capital stock of another corporation (“Exchange Stock”) in exchange
for their shares of Common Stock in any transaction involving a merger (other than a merger of the Company in which the holders of Common Stock immediately prior to the merger have the same proportionate ownership of common stock in the surviving
corporation immediately after the merger), consolidation, acquisition of property or stock, separation or reorganization (other than a mere reincorporation or the creation of a holding company) (each a “Corporate Transaction”), all Options
granted hereunder shall be converted into options to purchase shares of Exchange Stock unless the Company and the corporation issuing the Exchange Stock, in their sole discretion determine that any or all such Options granted hereunder shall not be
converted into options to purchase shares of Exchange Stock but instead shall terminate in accordance with the provisions of subsection 11.2(a). The amount and price of converted options shall be determined by adjusting the amount and price of the
Options granted hereunder in the same proportion as used for determining the number of shares of Exchange Stock the holders of the Common Stock receive in such merger, consolidation, acquisition of property or stock, separation or reorganization.

  
 (c) Each converted option shall, immediately following the
consummation of the Corporate Transaction, become fully vested and exercisable in whole or in part whether or not the vesting requirements set forth in the Option agreement have been satisfied, except that such acceleration shall not occur if, in
the opinion of the Company’s outside accountants, such acceleration would render unavailable “pooling of interests” accounting treatment for any Corporate Transaction for which pooling of interests accounting treatment is sought by
the Company. Such Options shall not so accelerate, however, if and to the extent that: (i) such Option is, in connection with the Corporate Transaction, either to be assumed by the successor corporation or parent thereof or to be replaced with a
comparable option for the purchase of shares of the capital stock of the successor corporation or its parent corporation or (ii) such Option is to be replaced with a cash incentive program of the successor corporation that preserves the spread
existing at the time of the Corporate Transaction and provides for subsequent payout in accordance with the same vesting schedule applicable to such Option. The determination of option comparability under clause (i) above shall be made by the Plan
Administrator, and its determination shall be conclusive and binding. All such Options shall terminate and cease to remain outstanding immediately following the consummation of the 
  

 -12- 

 Corporate Transaction, except to the extent assumed by the successor corporation or its parent corporation. Any such
Options that are assumed or replaced in the Corporate Transaction and do not otherwise accelerate at that time shall be accelerated in the event the Participant’s employment or services should subsequently terminate within two years following
such Corporate Transaction, unless such employment or services are terminated by the successor corporation for Cause or by the Participant voluntarily without Good Reason. 
  
 (d) Upon a merger of the Company in which the holders of Common Stock immediately prior to the merger have the same
proportionate ownership of common stock in the surviving corporation immediately after the merger, a mere reincorporation or the creation of a holding company, each Option outstanding under the Plan shall be assumed or an equivalent option shall be
substituted by the successor corporation or a parent or subsidiary of such corporation, and the vesting schedule set forth in the instrument evidencing the Option shall continue to apply to such assumed or equivalent option. 
  
 11.3 Fractional Shares 
  
 In the event of any adjustment in the number of shares covered by any Option, any fractional shares resulting from such
adjustment shall be disregarded and each such Option shall cover only the number of full shares resulting from such adjustment. 
  
 11.4 Determination of Board to Be Final 
  
 All Section 11 adjustments shall be made by the Board, and its determination as to what adjustments shall be made, and the extent thereof, shall be final,
binding and conclusive. 
  
 SECTION 12. AMENDMENT AND
TERMINATION OF PLAN 
  
 12.1 Amendment of Plan 
  
 The Plan may be amended only by the Board in such respects as it shall deem
advisable; provided, however, that to the extent required for compliance with Section 422 of the Code or any applicable law or regulation, stockholder approval shall be required for any amendment that would (a) increase the total number of shares
available for issuance under the Plan, (b) modify the class of persons eligible to receive Options, or (c) otherwise require stockholder approval under any applicable law or regulation. Any amendment made to the Plan that would constitute a
“modification” to Incentive Stock Options outstanding on the date of such amendment shall not, without the consent of the Participant, be applicable to such outstanding Incentive Stock Options but shall have prospective effect only.

  
 12.2 Term and Termination of Plan 
  
 The Board may suspend or terminate the Plan at any time. Unless earlier
terminated by the Board, the Plan shall expire on May 6, 2009. 
  

 -13- 

 12.3 Consent of Participant 
  
 The amendment or termination of the Plan or the amendment of an outstanding Option shall not, without the Participant’s
consent, impair or diminish any rights or obligations under any Option theretofore granted to the Participant under the Plan. Any change or adjustment to an outstanding Incentive Stock Option shall not, without the consent of the Participant, be
made in a manner so as to constitute a “modification” that would cause such Incentive Stock Option to fail to continue to qualify as an Incentive Stock Option. Notwithstanding the foregoing, any adjustments made pursuant to Section 11
shall not be subject to these restrictions. 
  
 SECTION 13.
GENERAL 
  
 13.1 Evidence of Options 
  
 Options granted under the Plan shall be evidenced by a written instrument
that shall contain such terms, conditions, limitations and restrictions as the Plan Administrator shall deem advisable and that are not inconsistent with the Plan. 
  
 13.2 No Individual Rights 
  
 Nothing in the Plan or any Option granted under the Plan shall be deemed to constitute an employment contract or confer or be deemed to confer on any
Participant any right to continue in the employ of, or to continue any other relationship with, the Company or any Related Corporation or limit in any way the right of the Company or any Related Corporation of the Company to terminate a
Participant’s employment or other relationship at any time, with or without Cause. 
  
 13.3 Registration 
  
 Notwithstanding any other
provision of the Plan, the Company shall have no obligation to issue or deliver any shares of Common Stock under the Plan or make any other distribution of benefits under the Plan unless such issuance, delivery or distribution would comply with all
applicable laws (including, without limitation, the requirements of the Securities Act), and the applicable requirements of any securities exchange or similar entity. 
  
 The Company shall be under no obligation to any Participant to register for offering or resale or to qualify for exemption
under the Securities Act, or to register or qualify under state securities laws, any shares of Common Stock, security or interest in a security paid or issued under, or created by, the Plan, or to continue in effect any such registrations or
qualifications if made. The Company may issue certificates for shares with such legends and subject to such restrictions on transfer and stop-transfer instructions as counsel for the Company deems necessary or desirable for compliance by the Company
with federal and state securities laws. 
  
 To the extent that the
Plan or any instrument evidencing an Option provides for issuance of stock certificates to reflect the issuance of shares of Common Stock, the issuance may be effected on a noncertificated basis, to the extent not prohibited by applicable law or the
applicable rules of any stock exchange. 
  

 -14- 

 13.4 No Rights as a Stockholder 
  
 No Option shall entitle the Participant to any cash dividend, voting or other right of a stockholder unless and until the
date of issuance under the Plan of the shares that are the subject of such Option. 
  
 13.5 Compliance With Laws and Regulations 
  
 Notwithstanding anything in the Plan to the contrary, the Plan Administrator, in its sole discretion, may bifurcate the Plan so as to restrict, limit or condition the use of any provision of the Plan to Participants who are officers or
directors subject to Section 16 of the Exchange Act without so restricting, limiting or conditioning the Plan with respect to other Participants. Additionally, in interpreting and applying the provisions of the Plan, any Option granted as an
Incentive Stock Option pursuant to the Plan shall, to the extent permitted by law, be construed as an “incentive stock option” within the meaning of Section 422 of the Code. 
  
 13.6 Participants in Foreign Countries 
  
 The Plan Administrator shall have the authority to adopt such modifications, procedures and subplans as may be necessary or desirable to comply with
provisions of the laws of foreign countries in which the Company or its Related Corporations may operate to assure the viability of the benefits from Options granted to Participants employed in such countries and to meet the objectives of the
Plan. 
  
 13.7 No Trust or Fund 
  
 The Plan is intended to constitute an “unfunded” plan. Nothing
contained herein shall require the Company to segregate any monies or other property, or shares of Common Stock, or to create any trusts, or to make any special deposits for any immediate or deferred amounts payable to any Participant, and no
Participant shall have any rights that are greater than those of a general unsecured creditor of the Company. 
  
 13.8 Severability 
  
 If
any provision of the Plan or any Option is determined to be invalid, illegal or unenforceable in any jurisdiction, or as to any person, or would disqualify the Plan or any Option under any law deemed applicable by the Plan Administrator, such
provision shall be construed or deemed amended to conform to applicable laws, or, if it cannot be so construed or deemed amended without, in the Plan Administrator’s determination, materially altering the intent of the Plan or the Option, such
provision shall be stricken as to such jurisdiction, person or Option, and the remainder of the Plan and any such Option shall remain in full force and effect. 
  
 13.9 Choice of Law 
  
 The Plan and all determinations made and actions taken pursuant hereto, to the extent not otherwise governed by the laws of the United States, shall be
governed by the laws of the State of Washington without giving effect to principles of conflicts of laws. 
  

 -15- 

 SECTION 14. EFFECTIVE DATE 
  
 The Effective Date is the date on which the Plan is adopted by the Board, so long as it is approved by the Company’s
stockholders at any time within 12 months of such adoption. 
  
 Adopted by the Board on March 10, 1999, amended by the Board on May 5, 1999, approved by the Company’s stockholders on May 6, 1999, amended by the Board on June 11, 1999, amended by the Board on March, 8, 2001, approved by the
Company’s stockholders on May 4, 2001, amended by the Board on December 12, 2002, and amended and restated by the Board on January 21, 2004. 
  

 -16- 

 PLAN ADOPTION AND AMENDMENTS/ADJUSTMENTS 
 SUMMARY PAGE 
  

							
	 Date of Board Action

	 	 Action

	 	 Section/Effect of Amendment

	 	 Date of Stockholder Approval

	 March 10, 1999
	 	Initial Plan Adoption	 	 	 	May 6, 1999
	 May 5, 1999
	 	Amendment to Section 9 of Plan	 	Section 9	 	Not required
				
	 June 11, 1999
	 	Added provision to allow shares surrendered in payment of exercise price to be counted in option pool.	 	Section 4.3	 	Not required
				
	 March 8, 2001
	 	Increased shares reserved from 5,000,000 to 10,000,000	 	Section 4.1	 	May 4, 2001
				
	 December 12, 2002
	 	Added provision to allow Plan Administrator to authorize officers to grant options	 	Section 3.1	 	Not required
				
	 January 21, 2004
	 	Added May 6, 2009 expiration date for the Plan	 	Section 12.2	 	Not required

  

 -1-

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