Atlas Venture Life Science Advisors, LLC — 13F Holdings

2026 Q3  ·  9 Positions

2026 Q3 Portfolio Activity

In 2026 Q3, Atlas Venture Life Science Advisors, LLC maintained a portfolio of 9 distinct positions. The most significant new addition was Obsidian Therapeutics, Inc., now representing 9.80% of the total fund value. The fund also reduced its exposure to Dyne Therapeutics, Inc. by 49.4%.
Position History hover any row below to update
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Atlas Venture Life Science Advisors, LLC New York, NY Alternative Asset Manager AUM $631M
Fund Overview SEC EDGAR
PCA Score Concentration Risk
Risk ENB
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Total Positions
9
Quarter
2026 Q3
Top Holding
KYMR (50.4%)
Top 10 Concentration
100.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-9 of 9
Stock History Sector / Type Port % Prev % Rank / Prev Conviction
Freshness
Change % Change Influence Shares Mkt Value Avg Cost Price Held 1st Owned Source Source Date Date Reported
KYMR
Kymera Therapeu...
Healthcare 50.43% 37.05% #1
Prev: #1
7.0
—
no change no change
P
S
2,847,541 $318,326,608
$42.32 +207.3%
$111.79 +16.3%
2022 Q1 13F Filing 2026-09-30 2026-11-10
IRON
Disc Medicine, ...
Healthcare 14.35% 12.56% #2 3
Prev: #5
6.0
—
-129,850 -8.6%
P
S
1,384,025 $90,598,277 2022 Q4 13F Filing 2026-09-30 2026-11-10
OBX
Obsidian Therap...
Healthcare 9.80% — #3
Prev: #—
8.4
—
4,503,149 —
NEW
 4,503,149 $61,828,236 2026 Q3 13F Filing 2026-09-30 2026-11-10
KLRA
Kailera Therape...
Healthcare 9.36% 12.93% #4
Prev: #4
5.2
—
no change no change
P
S
5,171,282 $59,056,040 2026 Q2 13F Filing 2026-09-30 2026-11-10
DYN
Dyne Therapeuti...
Healthcare 8.78% 17.14% #5 3
Prev: #2
4.0
—
-3,359,379 -49.4%
P
S
3,440,720 $55,429,999 2022 Q1 13F Filing 2026-09-30 2026-11-10
QTTB
Q32 Bio, Inc.
Healthcare 3.56% 3.93% #6
Prev: #6
2.4
—
no change no change
P
S
2,717,106 $22,470,467 2024 Q1 13F Filing 2026-09-30 2026-11-10
SION
Sionna Therapeu...
Healthcare 2.50% 14.95% #7 4
Prev: #3
2.0
—
no change no change
P
S
2,995,602 $15,756,867 2025 Q1 13F Filing 2026-09-30 2026-11-10
KRRO
Korro Bio, Inc.
Healthcare 1.21% 1.44% #8 1
Prev: #7
1.0
—
-189,624 -19.7%
P
S
773,260 $7,663,007 2023 Q4 13F Filing 2026-09-30 2026-11-10
ODTX
Odyssey Therape...
Healthcare 0.01% — #9
Prev: #—
3.5
—
2,692 —
NEW
 2,692 $59,816 2026 Q3 13F Filing 2026-09-30 2026-11-10
Showing 1-9 of 9 holdings

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