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Geron Corp. (GERN)

Geron Corp. (GERN) Insider Trading

Directors, officers and holders of more than 10% of GERN report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 52 transactions on file: 4 with code P, 1 with code S and 45 with other codes.

DateInsiderCodeShares
Sep 30, 2026Spiegel Robert J.A Award6,351
Jun 30, 2026Spiegel Robert J.A Award6,103
May 20, 2026Spiegel Robert J.A Award220,000
May 20, 2026McDonald John FA Award220,000
May 20, 2026Molineaux SusanA Award220,000
May 20, 2026Bir Dawn CarterA Award220,000
May 20, 2026O'Farrell Elizabeth G.A Award220,000
Apr 13, 2026Williams TimothyA Award2,500,000
Mar 31, 2026Spiegel Robert J.A Award5,243
Mar 25, 2026Andrews Patricia SA Award270,000
Mar 25, 2026Chinoporos ConstantineA Award270,000
Feb 18, 2026ROBERTSON MICHELLEM Exercise27,500
Feb 18, 2026ROBERTSON MICHELLEM Exercise27,500
Feb 18, 2026ROBERTSON MICHELLES Sale9,855
Feb 17, 2026Eid JosephA Award2,220,000
Feb 17, 2026ROBERTSON MICHELLEA Award1,660,000
Dec 31, 2025Spiegel Robert J.A Award5,918
Oct 20, 2025ElNawawi AhmedA Award3,000,000
Sep 30, 2025Spiegel Robert J.A Award5,702
Aug 7, 2025Semerjian HaroutA Award7,000,000
Aug 7, 2025Semerjian HaroutA Award4,000,000
Jun 30, 2025Spiegel Robert J.A Award5,540
May 21, 2025McDonald John FA Award180,000
May 21, 2025LAWLIS V BRYANA Award180,000
May 21, 2025Molineaux SusanA Award180,000
May 21, 2025Aggarwal GauravA Award180,000
May 21, 2025Bir Dawn CarterA Award180,000
May 21, 2025O'Farrell Elizabeth G.A Award180,000
May 21, 2025Spiegel Robert J.A Award180,000
May 9, 2025LAWLIS V BRYANP Purchase13,300
Mar 31, 2025Spiegel Robert J.A Award4,913
Feb 27, 2025Samuels Scott AlanP Purchase15,000
Feb 27, 2025Ziegler JamesP Purchase100,000
Feb 27, 2025SCARLETT JOHN AP Purchase12,500
Feb 18, 2025SCARLETT JOHN AA Award410,000
Feb 18, 2025ROBERTSON MICHELLEA Award110,000
Feb 18, 2025GRETHLEIN ANDREW JA Award839,000
Feb 18, 2025Samuels Scott AlanA Award104,000
Feb 18, 2025Samuels Scott AlanA Award621,000
Feb 18, 2025SCARLETT JOHN AA Award2,457,000
Feb 18, 2025GRETHLEIN ANDREW JA Award140,000
Feb 18, 2025Ziegler JamesA Award529,000
Feb 18, 2025Ziegler JamesA Award89,000
Feb 18, 2025ROBERTSON MICHELLEA Award656,000
Dec 31, 2024Spiegel Robert J.A Award2,206
Dec 31, 2024Spiegel Robert J.A Award2,206
Nov 11, 2024Eid JosephA Award2,500,000
Sep 30, 2024Spiegel Robert J.A Award1,767
Sep 30, 2024Spiegel Robert J.A Award1,767
Sep 9, 2024Ziegler JamesA Award1,600,000

The full Form 4 history is on the GERN company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.