Geron Corp (GERN) Insider Ownership

Historic Insider Ownership Trends

As of April 17, 2026, Geron's top three insider holders are Robert J. Spiegel (Director, 199.71K shares), Robert J. Spiegel (Director, 199.71K shares), Susan Molineaux (Director, 130.53K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Robert J. Spiegel - 199,707 0 01 Apr, 2026
Robert J. Spiegel - 199,707 0 01 Apr, 2026
Susan Molineaux - 0 130,527 03 Jan, 2024
Susan Molineaux - 0 124,307 02 Oct, 2023
Karin Eastham - 109,047 0 17 Jan, 2023
James Ziegler Evp, Chief Commercial Officer 100,000 0 03 Mar, 2025
James Ziegler Evp, Chief Commercial Officer 100,000 0 03 Mar, 2025
Olivia Kyusuk Bloom Evp, Chief Financial Officer 74,588 0 10 Feb, 2023
Elizabeth G. O'Farrell - 7,407 26,220 24 Aug, 2023
Elizabeth G. O'Farrell - 7,407 26,220 24 Aug, 2023
Scott Alan Samuels Evp, Chief Legal Officer 26,682 0 03 Mar, 2025
Scott Alan Samuels Evp, Chief Legal Officer 26,682 0 03 Mar, 2025
Michelle Robertson Evp, Chief Financial Officer 17,645 0 19 Feb, 2026
Michelle Robertson Evp, Chief Financial Officer 17,645 0 19 Feb, 2026
V Bryan Lawlis - 13,300 0 13 May, 2025
John A Scarlett Chairman, President And Ceo 12,500 0 03 Mar, 2025
Gaurav Aggarwal - 1,970 0 03 Jan, 2024

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
13 Apr, 2026 Timothy Williams Stock Option (Right to Buy) A 2,500,000 $0.00 2,500,000 D A
31 Mar, 2026 Robert J. Spiegel Common Stock A 5,243 $1.49 199,707 D A
25 Mar, 2026 Patricia S Andrews Stock Option (Right to Buy) A 270,000 $0.00 270,000 D A
25 Mar, 2026 Constantine Chinoporos Stock Option (Right to Buy) A 270,000 $0.00 270,000 D A
18 Feb, 2026 Michelle Robertson Common Stock A 27,500 $0.00 27,500 D M
17 Feb, 2026 Joseph Eid Stock Option (Right to Buy) A 2,220,000 $0.00 2,220,000 D A
18 Feb, 2026 Michelle Robertson Common Stock D 9,855 $1.94 17,645 D S
17 Feb, 2026 Michelle Robertson Stock Option (Right to Buy) A 1,660,000 $0.00 1,660,000 D A
18 Feb, 2026 Michelle Robertson Restricted Stock Units D 27,500 $0.00 82,500 D M
31 Dec, 2025 Robert J. Spiegel Common Stock A 5,918 $1.32 194,464 D A
20 Oct, 2025 Ahmed Elnawawi Stock Option (right to buy) A 3,000,000 $0.00 3,000,000 D A
30 Sep, 2025 Robert J. Spiegel Common Stock A 5,702 $1.37 188,546 D A
07 Aug, 2025 Harout Semerjian Stock Option (right to buy) A 7,000,000 $0.00 7,000,000 D A
07 Aug, 2025 Harout Semerjian Stock Option (right to buy) A 4,000,000 $0.00 4,000,000 D A
30 Jun, 2025 Robert J. Spiegel Common Stock A 5,540 $1.41 182,844 D A
21 May, 2025 John F Mcdonald Stock Option (right to buy) A 180,000 $0.00 180,000 D A
21 May, 2025 Robert J. Spiegel Stock Option (right to buy) A 180,000 $0.00 180,000 D A
21 May, 2025 Elizabeth G. O'Farrell Stock Option (right to buy) A 180,000 $0.00 180,000 D A
21 May, 2025 Dawn Carter Bir Stock Option (right to buy) A 180,000 $0.00 180,000 D A
21 May, 2025 Gaurav Aggarwal Stock Option (right to buy) A 180,000 $0.00 180,000 D A