Fairmount Funds Management LLC
CIK 1802528 · last filed 2026-06-11
Fairmount Funds Management LLC is a corporate insider who has filed 22 SEC Form 4 insider transactions across 8 companies since 2020. The most recent filing, for JBIO, was dated Jun 11, 2026. Across all open-market trades the lifetime net is +$270.0M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $300.2M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$300.18M
8
22
$270.05M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| JBIO | Director | — | $15.34 | — | $0 | 1 | 2026-06-11 |
| VRDN | Director | 5,090,928 | $16.35 | $83.24M | $279.99M | 6 | 2026-05-13 |
| COGT | Director | 5,503,418 | $33.10 | $182.16M | -$82.90M | 7 | 2026-01-22 |
| CRESCENT BIOPHARMA, INC. (GLYC) Delisted | Director | 2,747,866 | $15.70 | $43.14M | $72.95M | 1 | 2025-12-08 |
| APGE | Director | — | $88.33 | — | $0 | 1 | 2025-06-20 |
| SYRE | Director | 367,378 | $80.79 | $29.68M | $0 | 2 | 2024-05-16 |
| DNTH | Director | 62,146 | $82.07 | $5.10M | $0 | 2 | 2024-04-01 |
| Cogent Biosciences, Inc. (UMRX) Delisted | 10%+ Owner | 1,147,406 | — | — | $0 | 2 | 2020-07-13 |
Recent Filings
22 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-11 | JBIO | Grant (A) | — | $0 | EDGAR |
| 2026-05-13 | VRDN | Buy (P) | +3,529,410 | $60.00M | EDGAR |
| 2026-01-22 | COGT | Sell (S) | −3,500,000 | -$127.40M | EDGAR |
| 2025-12-08 | CRESCENT BIOPHARMA, INC. (GLYC) Delisted | Buy (P) | +5,440,000 | $72.95M | EDGAR |
| 2025-10-27 | VRDN | Buy (P) | +1,363,635 | $30.00M | EDGAR |
| 2025-07-14 | COGT | Buy (P) | +2,777,777 | $25.00M | EDGAR |
| 2025-06-20 | APGE | Grant (A) | — | $0 | EDGAR |
| 2025-06-11 | VRDN | Exer (M) | +42,300 | $499.1K | EDGAR |
| 2024-09-17 | VRDN | Buy (P) | +4,800,000 | $90.00M | EDGAR |
| 2024-06-12 | COGT | Exer (M) | +1,500,000 | $0 | EDGAR |