As of September 29, 2026, the three largest insider holders of CBIO are Funds Management Llc Fairmount (Director, 3.60Mn shares), Joshua T Brumm (Chief Executive Officer, 271.76K shares), Jonathan Mcneill (President And Coo, 134.59K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Funds Management Llc Fairmount | Director, TenPercentOwner | 0 | 3,601,316 | 3,601,316 | 83.8% | 20 Jul, 2026 |
| 2 | Joshua T Brumm | Chief Executive Officer | 271,765 | 0 | 271,765 | 6.3% | 18 Sep, 2026 |
| 3 | Jonathan Mcneill | President And Coo | 134,588 | 0 | 134,588 | 3.1% | 18 Sep, 2026 |
| 4 | Public Equities, L.P. Invus | TenPercentOwner | 63,176 | 0 | 63,176 | 1.5% | 09 Aug, 2024 |
| 5 | Christopher Grant Doughty | Chief Business Officer | 62,194 | 0 | 62,194 | 1.4% | 17 Dec, 2025 |
| 6 | Scott D Sandell | TenPercentOwner | 0 | 49,675 | 49,675 | 1.2% | 27 Jan, 2023 |
| 7 | Jan Pinkas | Chief Scientific Officer | 21,581 | 0 | 21,581 | 0.5% | 18 Sep, 2026 |
| 8 | Ellie Eunkyung Im | Chief Medical Officer | 21,446 | 0 | 21,446 | 0.5% | 18 Sep, 2026 |
| 9 | Richard William Scalzo | Chief Financial Officer | 19,730 | 0 | 19,730 | 0.5% | 18 Sep, 2026 |
| 10 | Barbara Harlin Bispham | Officer | 18,710 | 0 | 18,710 | 0.4% | 18 Sep, 2026 |
| 11 | Ryan Lynch | Officer | 13,631 | 0 | 13,631 | 0.3% | 18 Sep, 2026 |
| 12 | Edwin Rock | Chief Medical Officer | 6,804 | 0 | 6,804 | 0.2% | 24 Jun, 2024 |
| 13 | Rachel K. King | Director | 5,119 | 0 | 5,119 | 0.1% | 02 Jan, 2024 |
| 14 | John L. Magnani | Svp Of Research, Cso | 3,661 | 0 | 3,661 | 0.1% | 14 Nov, 2022 |
| 15 | Bruce S Johnson | Svp Chief Commercial Officer | 1,390 | 0 | 1,390 | 0.0% | 09 May, 2023 |
| 16 | Patricia S Andrews | Director | 1,039 | 0 | 1,039 | 0.0% | 02 Jan, 2024 |
| 17 | Daniel M Junius | Director | 985 | 0 | 985 | 0.0% | 01 Apr, 2024 |
| 18 | Brian M. Hahn | Svp Finance, Cfo | 706 | 0 | 706 | 0.0% | 20 Jun, 2024 |
| 19 | Partners L P/Il Bvf | TenPercentOwner | 624 | 0 | 624 | 0.0% | 17 Jun, 2025 |
| 20 | Mark Alan Goldberg | Director | 451 | 0 | 451 | 0.0% | 01 Apr, 2024 |
| 21 | Scott Koenig | Director | 368 | 0 | 368 | 0.0% | 02 Jun, 2023 |
| 22 | Armand Girard | Svp, Chief Business Officer | 292 | 0 | 292 | 0.0% | 14 Nov, 2022 |
| 23 | Harout Semerjian | Chief Executive Officer | 250 | 0 | 250 | 0.0% | 14 Nov, 2022 |
| 24 | Timothy R Pearson | Director | 247 | 0 | 247 | 0.0% | 14 Nov, 2022 |
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 |
|---|---|---|---|---|---|---|---|---|
| 16 Sep, 2026 | Ryan Lynch | Officer | Disposed S | 240 | $17.90 | $4.30K | 13,631 | Direct |
| 16 Sep, 2026 | Jonathan Mcneill | President And Coo | Disposed S | 731 | $17.90 | $13.08K | 138,427 | Direct |
| 16 Sep, 2026 | Jan Pinkas | Chief Scientific Officer | Disposed S | 658 | $17.90 | $11.78K | 21,581 | Direct |
| 16 Sep, 2026 | Richard William Scalzo | Chief Financial Officer | Disposed S | 568 | $17.90 | $10.17K | 19,730 | Direct |
| 16 Sep, 2026 | Barbara Harlin Bispham | Officer | Disposed S | 620 | $17.90 | $11.10K | 18,710 | Direct |
| 16 Sep, 2026 | Ellie Eunkyung Im | Chief Medical Officer | Disposed S | 623 | $17.90 | $11.15K | 21,446 | Direct |
| 16 Sep, 2026 | Joshua T Brumm | Chief Executive Officer | Disposed S | 1,610 | $17.90 | $28.82K | 279,602 | Direct |
| 18 Sep, 2026 | Jonathan Mcneill | President And Coo | Disposed S | 3,839 | $16.71 | $64.15K | 134,588 | Direct |
| 18 Sep, 2026 | Joshua T Brumm | Chief Executive Officer | Disposed S | 7,837 | $16.71 | $130.96K | 271,765 | Direct |
| 16 Jul, 2026 | Funds Management Llc Fairmount | Director, TenPercentOwner | Acquired P | 853,450 | $14.50 | $12.38Mn | 3,601,316 | Indirect |
| 16 Jul, 2026 | Funds Management Llc Fairmount | Director, TenPercentOwner | Acquired P | 525,897 | $14.50 | $7.62Mn | 2,294,037 | Indirect |
| 22 Jun, 2026 | Ellie Eunkyung Im | Chief Medical Officer | Disposed S | 1,219 | $17.99 | $21.93K | 22,069 | Direct |
| 22 Jun, 2026 | Jonathan Mcneill | President And Coo | Disposed S | 20,549 | $17.99 | $369.68K | 139,158 | Direct |
| 22 Jun, 2026 | Richard William Scalzo | Chief Financial Officer | Disposed S | 1,112 | $17.99 | $20.00K | 20,298 | Direct |
| 22 Jun, 2026 | Ryan Lynch | Officer | Disposed S | 465 | $17.99 | $8.37K | 13,871 | Direct |
| 22 Jun, 2026 | Joshua T Brumm | Chief Executive Officer | Disposed S | 42,305 | $17.99 | $761.07K | 281,212 | Direct |
| 22 Jun, 2026 | Jan Pinkas | Chief Scientific Officer | Disposed S | 1,288 | $17.99 | $23.17K | 22,239 | Direct |
| 22 Jun, 2026 | Barbara Harlin Bispham | Officer | Disposed S | 1,218 | $17.99 | $21.91K | 19,330 | Direct |
| 02 Jun, 2026 | Susan Moran | Director | Acquired A | 11,050 | $0.00 | $0 | 11,050 | Direct |
| 02 Jun, 2026 | Alexandra Balcom | Director | Acquired A | 11,050 | $0.00 | $0 | 11,050 | Direct |