COAG · Insider Trading
Hemab Therapeutics Holdings, Inc. Common Stock
Every open-market purchase and sale reported by COAG officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-25 | Keli Walbert | Director | A | +36,000 deriv. | — |
| 2026-06-17 | Peter Kolchinsky | 10%+ Owner | Buy | +67,669 | +$1.69M |
| 2026-05-21 | RA CAPITAL MANAGEMENT, L.P. | 10%+ Owner | Buy | +4,798 | +$119.78K |
| 2026-05-14 | Rajeev M. Shah | 10%+ Owner | Buy | +6,387 | +$159.04K |
| 2026-05-11 | RA Capital Healthcare Fund LP | 10%+ Owner | Buy | +51,258 | +$1.27M |
| 2026-05-06 | Novo Holdings A/S | 10%+ Owner | C | +4,180,550 | — |
| 2026-05-06 | Rajeev M. Shah | Director | MIXED | +7,678,515 | +$52.22M |
| 2026-05-04 | Mads Nikolaj Behrndt-Eriksen | See Remarks | A | +244,222 deriv. | — |
| 2026-05-04 | John Maraganore | Director | C | +35,948 | — |
| 2026-05-04 | Catherine Madigan | Chief Medical Officer | A | +194,150 deriv. | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| RA Capital Healthcare Fund LP | 10%+ Owner | 6,325,914 | $242.92M |
| Novo Holdings A/S | 10%+ Owner | 4,180,550 | $160.53M |
| RA CAPITAL MANAGEMENT, L.P. | 10%+ Owner | 1,009,052 | $38.75M |
| Peter Kolchinsky | 10%+ Owner | 1,009,052 | $38.75M |
| Rajeev M. Shah | Director | 354,938 | $13.63M |
| John Maraganore | Director | 35,948 | $1.38M |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the COAG quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.