Atlas Venture Life Science Advisors, LLC — 13F Holdings & Portfolio
CIK 1917529 · latest 13F-HR filed 2026-05-14
Atlas Venture Life Science Advisors, LLC manages $790.0M in 13F-reported U.S. long-equity assets across 6 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are KYMR (48.26%), DYN (20.95%), SION (15.20%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 0 new positions, exited 2, added to 3, and trimmed 2.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$790.0M
Long-equity book
6
Distinct positions
2026-03-31
Filed 2026-05-14
+0 / −2 / ↑3 / ↓2
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- Kymera Therapeutics, Inc.$18.7M +5.2%
- Q32 Bio, Inc.$6.5M +93.4%
- Korro Bio, Inc.$3.8M +41.3%
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | Kymera Therapeutics, Inc. | KYMR | 501575104 | $381.3M | 48.26% | 4,578,008 | SH |
| 2 | Dyne Therapeutics, Inc. | DYN | 26818M108 | $165.5M | 20.95% | 9,130,465 | SH |
| 3 | Sionna Therapeutics, Inc. | SION | 829401108 | $120.1M | 15.20% | 2,995,602 | SH |
| 4 | Disc Medicine, Inc. | IRON | 254604101 | $96.8M | 12.25% | 1,513,875 | SH |
| 5 | Q32 Bio, Inc. | QTTB | 746964105 | $13.4M | 1.70% | 2,092,106 | SH |
| 6 | Korro Bio, Inc. | KRRO | 500946108 | $12.9M | 1.63% | 1,137,149 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-14 | $790.0M | 6 | 0001104659-26-061232 |
| 2025-12-31 | 2026-02-13 | $865.2M | 8 | 0001104659-26-014463 |
| 2025-09-30 | 2025-11-13 | $752.6M | 9 | 0001104659-25-111321 |