SEPN's three largest insider shareholders as of September 29, 2026 are Rock Ventures V, L.P. Third (TenPercentOwner, 6.07Mn shares), Rock Ventures Vi, L.P. Third (TenPercentOwner, 4.21Mn shares), Rock Ventures V, L.P. Third (TenPercentOwner, 3.15Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Rock Ventures V, L.P. Third | TenPercentOwner | 6,068,391 | 0 | 6,068,391 | 49.4% | 14 Aug, 2026 |
| 2 | Rock Ventures Vi, L.P. Third | TenPercentOwner | 4,211,659 | 0 | 4,211,659 | 34.3% | 26 Feb, 2025 |
| 3 | Jeffrey Finer | Ceo And President | 826,907 | 0 | 826,907 | 6.7% | 04 Apr, 2025 |
| 4 | Capital Management, L.P. Ra | Director, TenPercentOwner | 0 | 725,443 | 725,443 | 5.9% | 14 Aug, 2026 |
| 5 | Elizabeth Bhatt | President And Coo | 174,209 | 0 | 174,209 | 1.4% | 13 Aug, 2026 |
| 6 | Alan Ezekowitz | Director | 117,420 | 0 | 117,420 | 1.0% | 10 Mar, 2025 |
| 7 | Daniel D. Long | Svp, Drug Discovery | 96,412 | 0 | 96,412 | 0.8% | 03 Sep, 2026 |
| 8 | Gil M Labrucherie | Chief Financial Officer | 0 | 40,000 | 40,000 | 0.3% | 27 Feb, 2025 |
| 9 | Uwe Klein | Svp, Biological Sciences | 23,008 | 0 | 23,008 | 0.2% | 19 Aug, 2025 |
| 10 | Samira Shaikhly | Chief People Officer | 793 | 0 | 793 | 0.0% | 30 Jun, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 08 Sep, 2026 | Rajiv Patni | Chief Medical Officer | Acquired A | 275,000 | $0.00 | $0 | 275,000 | Direct |
| 01 Sep, 2026 | Daniel D. Long | Svp, Drug Discovery | Acquired M | 3,333 | $2.76 | $9.20K | 99,745 | Direct |
| 01 Sep, 2026 | Daniel D. Long | Svp, Drug Discovery | Disposed S | 3,333 | $37.83 | $126.08K | 96,412 | Direct |
| 01 Sep, 2026 | Daniel D. Long | Svp, Drug Discovery | Disposed M | 3,333 | $0.00 | $0 | 9,085 | Direct |
| 12 Aug, 2026 | Rock Ventures V, L.P. Third | TenPercentOwner | Acquired S | 147,059 | $50.27 | $7.39Mn | 6,068,532 | Direct |
| 12 Aug, 2026 | Capital Management, L.P. Ra | Director, TenPercentOwner | Disposed S | 746,500 | $42.50 | $31.73Mn | 4,777,415 | Indirect |
| 12 Aug, 2026 | Rock Ventures V, L.P. Third | TenPercentOwner | Acquired S | 141 | $51.08 | $7.20K | 6,068,391 | Direct |
| 12 Aug, 2026 | Capital Management, L.P. Ra | Director, TenPercentOwner | Disposed S | 746,500 | $42.50 | $31.73Mn | 725,443 | Indirect |
| 11 Aug, 2026 | Elizabeth Bhatt | President And Coo | Acquired M | 18,681 | $6.81 | $127.22K | 192,890 | Direct |
| 11 Aug, 2026 | Elizabeth Bhatt | President And Coo | Acquired M | 6,319 | $2.76 | $17.44K | 199,209 | Direct |
| 11 Aug, 2026 | Elizabeth Bhatt | President And Coo | Disposed S | 25,000 | $44.00 | $1.10Mn | 174,209 | Direct |
| 11 Aug, 2026 | Elizabeth Bhatt | President And Coo | Disposed M | 18,681 | $0.00 | $0 | 62,230 | Direct |
| 11 Aug, 2026 | Elizabeth Bhatt | President And Coo | Disposed M | 6,319 | $0.00 | $0 | 82,332 | Direct |
| 03 Aug, 2026 | Daniel D. Long | Svp, Drug Discovery | Acquired M | 1,816 | $2.76 | $5.01K | 98,228 | Direct |
| 03 Aug, 2026 | Daniel D. Long | Svp, Drug Discovery | Acquired M | 1,518 | $2.76 | $4.19K | 99,746 | Direct |
| 03 Aug, 2026 | Daniel D. Long | Svp, Drug Discovery | Disposed S | 1,000 | $33.98 | $33.98K | 98,746 | Direct |
| 03 Aug, 2026 | Daniel D. Long | Svp, Drug Discovery | Disposed S | 2,334 | $34.68 | $80.94K | 96,412 | Direct |
| 03 Aug, 2026 | Daniel D. Long | Svp, Drug Discovery | Disposed M | 1,816 | $0.00 | $0 | 5,227 | Direct |
| 03 Aug, 2026 | Daniel D. Long | Svp, Drug Discovery | Disposed M | 1,518 | $0.00 | $0 | 12,418 | Direct |
| 15 Jul, 2026 | Elizabeth Bhatt | President And Coo | Acquired M | 4,000 | $6.81 | $27.24K | 178,209 | Direct |