As of September 29, 2026, Agenus's top three insider holders are Garo H Armen (Chairman And Ceo, 371.11K shares), Steven J O'Day (Chief Medical Officer, 57.12K shares), Thomas L Harrison (Director, 47.55K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Garo H Armen | Chairman And Ceo | 371,108 | 0 | 371,108 | 71.2% | 13 Jul, 2026 |
| 2 | Steven J O'Day | Chief Medical Officer | 57,116 | 0 | 57,116 | 11.0% | 30 Jun, 2025 |
| 3 | Thomas L Harrison | Director | 47,545 | 0 | 47,545 | 9.1% | 06 Jul, 2026 |
| 4 | Christine M Klaskin | Pfo Pao | 23,478 | 0 | 23,478 | 4.5% | 30 Jun, 2025 |
| 5 | Jennifer Buell | Coo And President | 19,738 | 0 | 19,738 | 3.8% | 06 May, 2025 |
| 6 | Ulf Wiinberg | Director | 1,034 | 0 | 1,034 | 0.2% | 17 Nov, 2023 |
| 7 | Susan B Hirsch | Director | 906 | 0 | 906 | 0.2% | 04 Jan, 2023 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 10 Aug, 2026 | Garo H Armen | Director, Officer | Acquired A | 1,971,500 | $0.00 | $0 | 1,971,500 | Direct |
| 05 Aug, 2026 | Susan B Hirsch | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 05 Aug, 2026 | Timothy Wright | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 05 Aug, 2026 | Thomas L Harrison | Director | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |
| 05 Aug, 2026 | Brian Corvese | Director | Acquired A | 100,000 | $0.00 | $0 | 100,000 | Direct |
| 05 Aug, 2026 | Steven J O'Day | Chief Medical Officer | Acquired A | 100,000 | $0.00 | $0 | 100,000 | Direct |
| 05 Aug, 2026 | Jennifer Buell | Director, Officer | Acquired A | 200,000 | $0.00 | $0 | 200,000 | Direct |
| 10 Jul, 2026 | Garo H Armen | Director, Officer | Acquired A | 4,852 | $3.35 | $16.25K | 371,108 | Direct |
| 01 Jul, 2026 | Timothy Wright | Director | Acquired A | 2,268 | — | — | 26,181 | Direct |
| 01 Jul, 2026 | Thomas L Harrison | Director | Acquired A | 8,547 | $3.58 | $30.62K | 47,545 | Direct |
| 26 Jun, 2026 | Garo H Armen | Director, Officer | Acquired A | 5,364 | $3.03 | $16.25K | 366,256 | Direct |
| 12 Jun, 2026 | Garo H Armen | Director, Officer | Acquired A | 4,925 | $3.30 | $16.25K | 360,892 | Direct |
| 29 May, 2026 | Garo H Armen | Director, Officer | Acquired A | 4,644 | $3.50 | $16.25K | 355,967 | Direct |
| 15 May, 2026 | Garo H Armen | Director, Officer | Acquired A | 4,540 | $3.58 | $16.25K | 351,323 | Direct |
| 01 May, 2026 | Garo H Armen | Director, Officer | Acquired A | 4,233 | $3.84 | $16.25K | 346,783 | Direct |
| 24 Apr, 2026 | Jennifer Buell | Director, Officer | Acquired A | 300,000 | $0.00 | $0 | 300,000 | Direct |
| 24 Apr, 2026 | Thomas L Harrison | Director | Acquired A | 122,500 | $0.00 | $0 | 122,500 | Direct |
| 24 Apr, 2026 | Garo H Armen | Director, Officer | Acquired A | 1,000,000 | $0.00 | $0 | 1,000,000 | Direct |
| 24 Apr, 2026 | Steven J O'Day | Chief Medical Officer | Acquired A | 70,000 | $0.00 | $0 | 70,000 | Direct |
| 24 Apr, 2026 | Brian Corvese | Director | Acquired A | 210,000 | $0.00 | $0 | 210,000 | Direct |