# Atlas Venture Life Science Advisors, LLC

> Institutional holdings reported to the SEC as of Q2 2026 on Form 13F. CIK 1917529. Source: https://holderbook.com/funds/1917529-atlas-venture-life-science-advisors-llc/

- Reported value: $881.3M
- Positions: 7
- Weight of the ten largest: 100.0%
- Filed: 2026-08-13

A 13F reports long US equity positions only. Short positions, bonds, foreign listings, private holdings and cash are not visible, so this is not the manager's whole book.

## Holdings

| Security | Ticker | Value | Shares | Weight | Quarters held |
|---|---|---|---|---|---|
| KYMERA THERAPEUTICS INC | [KYMR](https://holderbook.com/stocks/KYMR/) | $326.5M | 2,847,541 | 37.1% | 19 |
| DYNE THERAPEUTICS INC | [DYN](https://holderbook.com/stocks/DYN/) | $151.0M | 6,800,099 | 17.1% | 19 |
| SIONNA THERAPEUTICS INC | [SION](https://holderbook.com/stocks/SION/) | $131.8M | 2,995,602 | 15.0% | 6 |
| KAILERA THERAPEUTICS INC | [KLRA](https://holderbook.com/stocks/KLRA/) | $113.9M | 5,171,282 | 12.9% | 1 |
| DISC MEDICINE INC | [IRON](https://holderbook.com/stocks/IRON/) | $110.7M | 1,513,875 | 12.6% | 15 |
| Q32 BIO INC | [QTTB](https://holderbook.com/stocks/QTTB/) | $34.6M | 2,717,106 | 3.9% | 10 |
| KORRO BIO INC | [KRRO](https://holderbook.com/stocks/KRRO/) | $12.7M | 962,884 | 1.4% | 11 |

## What the disclosed book did

Not the fund's return. This is the change in value of the positions disclosed on Form 13F, had they been left untouched, against SPY over the same quarter ends.

| Quarter | Book | Market | Difference | Priced |
|---|---|---|---|---|
| Q2 2026 | +28.1% | +14.8% | +13.3% | 100% |
| Q1 2026 | +8.6% | -4.6% | +13.2% | 99% |
| Q4 2025 | +28.0% | +2.4% | +25.7% | 99% |
| Q3 2025 | +35.0% | +7.8% | +27.2% | 92% |
| Q2 2025 | +28.2% | +10.5% | +17.8% | 99% |
| Q1 2025 | -41.5% | -4.6% | -37.0% | 100% |
| Q4 2024 | -22.1% | +2.1% | -24.2% | 100% |
| Q3 2024 | +18.5% | +5.4% | +13.0% | 100% |

## Quarter by quarter

| Quarter | Value | Positions |
|---|---|---|
| Q2 2026 | $881.3M | 7 |
| Q1 2026 | $790.0M | 6 |
| Q4 2025 | $865.2M | 8 |
| Q3 2025 | $752.6M | 9 |
| Q2 2025 | $662.4M | 11 |
| Q1 2025 | $521.8M | 13 |
| Q4 2024 | $819.7M | 13 |
| Q3 2024 | $1.1B | 14 |
| Q2 2024 | $949.6M | 15 |
| Q1 2024 | $1.1B | 16 |
| Q4 2023 | $839.8M | 16 |
| Q3 2023 | $645.6M | 15 |