This excerpt taken from the SGEN DEF 14A filed Apr 17, 2007.
21. Limitation on Liability.
The Company and any Affiliate which is in existence or hereafter comes into existence shall not be liable to a Participant, an Employee, an Awardee or any other persons as to:
(a) The Non-Issuance of Shares. The non-issuance or sale of Shares (including under Section 17 above) as to which the Company has been unable, or the Administrator deems it infeasible, to obtain from any regulatory body having jurisdiction the authority deemed by the Companys counsel to be necessary to the lawful issuance and sale of any shares hereunder; and
(b) Tax Consequences. Any tax consequence realized by any Participant, Employee, Awardee or other person due to the receipt, vesting, exercise or settlement of any Option or other Award granted hereunder or due to the transfer of any Shares issued hereunder. The Participant is responsible for, and by accepting an Award under the Plan agrees to bear, all taxes of any nature that are legally imposed upon the Participant in connection with an Award, and the Company does not assume, and will not be liable to any party for, any cost or liability arising in connection with such tax liability legally imposed on the Participant. In particular, Awards issued under the Plan may be characterized by the Internal Revenue Service (the IRS) as deferred compensation under the Code resulting in additional taxes, including in some cases interest and penalties. In the event the IRS determines that an Award constitutes deferred compensation under the Code or challenges any good faith characterization made by the Company or any other party of the tax treatment applicable to an Award, the Participant will be responsible for the additional taxes, and interest and penalties, if any, that are determined to apply if such challenge succeeds, and the Company will not reimburse the Participant for the amount of any additional taxes, penalties or interest that result.
(c) Forfeiture. The requirement that Participant forfeit an Award, or the benefits received or to be received under an Award, pursuant to any Applicable Law.