LTGO · Insider Trading
Latigo Biotherapeutics, Inc. Common Stock
Every open-market purchase and sale reported by LTGO 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 |
|---|---|---|---|---|---|
| 2026-08-12 | 5AM Partners VI, LLC | 10%+ Owner | C | +7,325,962 | — |
| 2026-08-12 | Sanofi | 10%+ Owner | C | +672,778 | — |
| 2026-08-11 | Westlake BioPartners GP I, LLC | 10%+ Owner | C | +12,695,305 | — |
| 2026-08-10 | Beth C Seidenberg | Director | C | +12,695,305 | — |
| 2026-08-10 | Todd N Smith | Director | A | +105,542 deriv. | — |
| 2026-08-10 | James B. Tananbaum | Director | MIXED | +9,181,328 | +$2.52M |
| 2026-08-10 | Foresite Capital Opportunity Fund V, L.P. | 10%+ Owner | MIXED | +9,181,328 | +$2.52M |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Beth C Seidenberg | Director | 5,160,847 | $72.46M |
| Westlake BioPartners Fund II, L.P. | 10%+ Owner | 5,160,847 | $72.46M |
| 5AM Partners VI, LLC | 10%+ Owner | 4,975,543 | $69.86M |
| James B. Tananbaum | Director | 3,562,984 | $50.02M |
| Foresite Capital Management VI LLC | 10%+ Owner | 3,414,544 | $47.94M |
| Foresite Capital Opportunity Fund V, L.P. | 10%+ Owner | 3,117,664 | $43.77M |
| Westlake BioPartners GP I, LLC | 10%+ Owner | 2,094,813 | $29.41M |
| Sanofi | 10%+ Owner | 494,800 | $6.95M |
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 LTGO 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.