As of March 23, 2026, the three largest insider holders of CELC are Brian F. Sullivan (Chief Executive Officer, 1.37Mn shares), David Dalvey (Director, 90.00K shares), Richard Nigon (Director, 89.03K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Brian F. Sullivan | Chief Executive Officer | 1,370,199 | 0 | 04 Sep, 2025 |
| David Dalvey | 0 | 90,000 | 29 Jan, 2026 | |
| Richard Nigon | 89,035 | 0 | 09 Jan, 2026 | |
| Leo Furcht | 11,000 | 0 | 08 Dec, 2025 | |
| Richard E Buller | 0 | 6,760 | 09 Dec, 2025 | |
| Polly A. Murphy | 5,000 | 0 | 23 Nov, 2022 | |
| Richard E Buller | 1,029 | 0 | 29 May, 2025 | |
| Charles R Romp | 215 | 0 | 13 Feb, 2026 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 11 Feb, 2026 | Charles R Romp | Common Stock | A | 215 | $0.00 | 215 | D | A |
| 27 Jan, 2026 | David Dalvey | Common Stock | D | 20,000 | $120.03 | 90,000 | I | S |
| 15 Dec, 2025 | Richard Nigon | Common Stock | D | 19,975 | $0.00 | 89,035 | D | G |
| 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 | 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 |
| 21 Nov, 2025 | David Dalvey | Common Stock | D | 15,000 | $100.00 | 110,000 | I | S |
| 19 Nov, 2025 | Richard E Buller | Common Stock | D | 500 | $0.00 | 7,260 | I | G |
| 20 Nov, 2025 | Richard E Buller | Common Stock | A | 3,900 | $14.83 | 11,160 | I | M |
| 20 Nov, 2025 | Richard E Buller | Common Stock | D | 3,900 | $96.73 | 7,260 | I | S |
| 20 Nov, 2025 | Richard E Buller | Stock Option (right to buy) | D | 3,900 | $0.00 | 2,622 | I | M |
| 11 Sep, 2025 | Richard Nigon | Common Stock | A | 4,672 | $7.56 | 105,765 | D | X |
| 11 Sep, 2025 | Richard Nigon | Common Stock | A | 3,245 | $7.56 | 109,010 | D | X |