Atlas Venture Life Science Advisors, LLC
CIK
1917529
Location
CAMBRIDGE, MA
Portfolio Value
Small
$881,289,155
Diversification
Moderately concentrated
Filing Date
Global Rank
#2,722
/ 8,795
▼ 233
· as of Jun 2026
Top Industry
Biotechnology
100.0%
3Y Alpha vs SPY
+8.9%
Period ended 3 months ago
Filed Aug 13, 2026 · 55d
19 quarters · since Dec 2021
Clone Performance
Build a hypothetical price-return history from this filer's public 13F holdings.
View clone backtestPortfolio Concentration
7 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026Top Position
37.1%
−11.2 pts
Top 5
94.6%
−3.7 pts
Top 10
100.0%
0.0 pts
HHI
2,233
Moderately concentrated−923
Portfolio Trend
19 quarters · across all stocks
Sector Breakdown
As of Jun 30, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Healthcare | 100.0% | $881,289,155 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased
1 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| QTTB | Q32 Bio Inc. | +625,000 | 2,717,106 | $34,615,930 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced
3 positions
New Positions
Positions the filer opened this quarter
1 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| KLRA | Kailera Therapeutics, Inc. | 5,171,282 | $113,923,342 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exitedNo qualifying positions this quarter.
7 tracked positions ·
$881,289,155 total
· filing declares
7 positions · $881,289,158
· as of Jun 30, 2026
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| KYMR |
Kymera Therapeutics, Inc.
Healthcare
|
Reduced | 2,847,541 | $326,527,526 | 37.05% | |
| DYN |
Dyne Therapeutics, Inc.
Healthcare
|
Reduced | 6,800,099 | $151,030,198 | 17.14% | |
| SION |
Sionna Therapeutics, Inc.
Healthcare
|
Held | 2,995,602 | $131,776,531 | 14.95% | |
| KLRA |
Kailera Therapeutics, Inc.
Healthcare
|
NEW | 5,171,282 | $113,923,342 | 12.93% | |
| IRON |
Disc Medicine, Inc.
Healthcare
|
Held | 1,513,875 | $110,724,817 | 12.56% | |
| QTTB |
Q32 Bio Inc.
Healthcare
|
Added | 2,717,106 | $34,615,930 | 3.93% | |
| KRRO |
Korro Bio, Inc.
Healthcare
|
Reduced | 962,884 | $12,690,811 | 1.44% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.