As of August 29, 2026, Erasca's top three insider holders are Venture Partners X, Llc Arch (TenPercentOwner, 11.06Mn shares), Alexander W. Casdin (Director, 573.97K shares), Lin Wei (Chief Medical Officer, 315.81K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Venture Partners X, Llc Arch | TenPercentOwner | 0 | 11,055,554 | 11,055,554 | 90.0% | 20 Jul, 2021 |
| 2 | Alexander W. Casdin | Director | 573,974 | 0 | 573,974 | 4.7% | 22 May, 2024 |
| 3 | Lin Wei | Chief Medical Officer | 315,812 | 0 | 315,812 | 2.6% | 02 Feb, 2023 |
| 4 | David M. Chacko | Cfo And Cbo | 279,980 | 0 | 279,980 | 2.3% | 30 Jan, 2026 |
| 5 | Ebun Garner | Chief Legal Officer | 25,076 | 0 | 25,076 | 0.2% | 03 Apr, 2026 |
| 6 | James Arthur Bristol | Director | 0 | 20,000 | 20,000 | 0.2% | 22 Dec, 2022 |
| 7 | Valerie Denise Harding Start | Director | 0 | 20,000 | 20,000 | 0.2% | 07 Dec, 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 | Charles S. Fuchs | President, Rd | Acquired A | 1,300,000 | $0.00 | $0 | 1,300,000 | Direct |
| 26 Jun, 2026 | Valerie Denise Harding Start | Director | Acquired A | 29,888 | $0.00 | $0 | 29,888 | Direct |
| 26 Jun, 2026 | Alexander W. Casdin | Director | Acquired A | 29,888 | $0.00 | $0 | 29,888 | Direct |
| 26 Jun, 2026 | Julie Hambleton | Director | Acquired A | 29,888 | $0.00 | $0 | 29,888 | Direct |
| 26 Jun, 2026 | Jean I Liu | Director | Acquired A | 29,888 | $0.00 | $0 | 29,888 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Acquired M | 80,000 | $1.70 | $136.00K | 105,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Acquired M | 80,000 | $1.70 | $136.00K | 105,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Acquired M | 80,000 | $1.70 | $136.00K | 105,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Acquired M | 80,000 | $1.70 | $136.00K | 105,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed S | 80,000 | $16.40 | $1.31Mn | 25,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed S | 80,000 | $16.40 | $1.31Mn | 25,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed S | 80,000 | $16.40 | $1.31Mn | 25,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed S | 80,000 | $16.40 | $1.31Mn | 25,076 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed M | 80,000 | $0.00 | $0 | 280,000 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed M | 80,000 | $0.00 | $0 | 280,000 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed M | 80,000 | $0.00 | $0 | 280,000 | Direct |
| 01 Apr, 2026 | Ebun Garner | Chief Legal Officer | Disposed M | 80,000 | $0.00 | $0 | 280,000 | Direct |
| 04 Mar, 2026 | Shannon Morris | Chief Medical Officer | Acquired M | 20,000 | $1.70 | $34.00K | 20,000 | Direct |
| 04 Mar, 2026 | Shannon Morris | Chief Medical Officer | Acquired M | 20,000 | $1.70 | $34.00K | 20,000 | Direct |
| 04 Mar, 2026 | Shannon Morris | Chief Medical Officer | Acquired M | 20,000 | $1.70 | $34.00K | 20,000 | Direct |