As of June 10, 2026, the three largest insider holders of CELC are Bros. Advisors Lp Baker (TenPercentOwner, 7.21Mn shares), Richard Nigon (Director, 79.03K shares), Leo Furcht (Director, 11.00K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Richard Nigon | - | 79,035 | 0 | 13 Apr, 2026 |
| Bros. Advisors Lp Baker | - | 0 | 7,211,484 | 10 Sep, 2025 |
| Richard E Buller | - | 0 | 6,760 | 02 Apr, 2026 |
| Leo Furcht | - | 11,000 | 0 | 08 Dec, 2025 |
| Polly A. Murphy | - | 5,000 | 0 | 23 Nov, 2022 |
* 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.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 09 Apr, 2026 | Richard Nigon | Common Stock | D | 10,000 | $0.00 | 79,035 | D | G |
| 31 Mar, 2026 | Richard E Buller | Common Stock | A | 3,000 | $5.10 | 9,760 | I | M |
| 31 Mar, 2026 | Richard E Buller | Common Stock | D | 2,325 | $110.11 | 7,435 | I | S |
| 31 Mar, 2026 | Richard E Buller | Common Stock | D | 675 | $110.83 | 6,760 | I | S |
| 31 Mar, 2026 | Richard E Buller | Stock Option (right to buy) | D | 3,000 | $0.00 | 9,654 | I | M |
| 05 Dec, 2025 | Richard E Buller | Common Stock | A | 3,000 | $5.50 | 9,760 | I | M |
| 05 Dec, 2025 | Richard E Buller | Common Stock | D | 1,490 | $105.34 | 8,270 | I | S |
| 05 Dec, 2025 | Richard E Buller | Common Stock | D | 1,510 | $106.04 | 6,760 | I | S |
| 05 Dec, 2025 | Richard E Buller | Stock Option (right to buy) | D | 3,000 | $0.00 | 1,555 | I | M |
| 04 Dec, 2025 | Leo Furcht | Common Stock | A | 250 | $7.60 | 11,000 | D | M |
| 04 Dec, 2025 | Leo Furcht | Common Stock | A | 250 | $7.60 | 11,000 | D | M |
| 04 Dec, 2025 | Leo Furcht | Common Stock | A | 250 | $7.60 | 11,000 | D | M |
| 04 Dec, 2025 | Leo Furcht | Stock Option (right to buy) | D | 250 | $0.00 | 0 | D | M |
| 04 Dec, 2025 | Leo Furcht | Stock Option (right to buy) | D | 250 | $0.00 | 0 | D | M |
| 04 Dec, 2025 | Leo Furcht | Stock Option (right to buy) | D | 250 | $0.00 | 0 | D | M |
| 01 Dec, 2025 | Richard E Buller | Common Stock | A | 1,100 | $14.83 | 8,360 | I | M |
| 01 Dec, 2025 | Richard E Buller | Common Stock | D | 1,100 | $98.13 | 7,260 | I | S |
| 02 Dec, 2025 | Richard E Buller | Common Stock | D | 500 | $0.00 | 6,760 | I | G |
| 01 Dec, 2025 | Richard E Buller | Stock Option (right to buy) | D | 1,100 | $0.00 | 1,522 | I | M |
| 19 Nov, 2025 | Richard E Buller | Common Stock | D | 500 | $0.00 | 7,260 | I | G |