GERON CORP — Director's Dealing 2010

May 21, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: GERON CORP (GERN)
CIK: 0000886744
Period of Report: 2010-05-19

Reporting Person: ZENNER PATRICK J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-19	Common Stock	A	5625	—	Acquired	82146	Direct
2010-05-19	Common Stock	D	8436	—	Disposed	73710	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-19	Stock Option (right to buy)	$5.29	A	11250	Acquired	2012-05-19	Common Stock (11250)	Direct

Footnotes

F1: The shares of restricted stock will remain subject to a repurchase right of Geron over four years, during such time the repurchase right will lapse with respect to 25% of such shares on each anniversary date of May 28, 2010. The lapse of Geron's repurchase right is conditioned on the director continuing to provide services to Geron through each vesting date.

F2: Forfeiture of restricted stock awards in connection with the director's retirement effective May 19, 2010. Repurchase right for remaining outstanding restricted stock awards caused to lapse on May 19, 2010.

F3: Upon the director's retirement effective May 19, 2010, the exercise period for all outstanding options was extended until the earlier of the original expiration date of such options or May 19, 2012.