Atlas Venture Life Science Advisors, LLC
Position in IRON — Disc Medicine, Inc.
CIK 1917529
CAMBRIDGE, MA
Position in IRON
as of Jun 30, 2026
· filed Aug 13, 2026
Position Value
$110,724,817
+$13,927,650 QoQ
Shares Held
1,513,875
0.0% QoQ
Ownership
3.94%
of shares outstanding
% of Portfolio
12.56%
of 13F equity value
Holder Rank
#9
of 216 holders
Holding Since
Dec 2021
19 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in IRON Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026Atlas Venture Life Science Advisors, LLC holds $881,289,155 across 7 Biotechnology names. IRON ranks #5 (12.6% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | KYMR |
Kymera Therapeutics, Inc.
|
2,847,541 | $326,527,526 | |
| 2 | DYN |
Dyne Therapeutics, Inc.
|
6,800,099 | $151,030,198 | |
| 3 | SION |
Sionna Therapeutics, Inc.
|
2,995,602 | $131,776,531 | |
| 4 | KLRA |
Kailera Therapeutics, Inc.
|
5,171,282 | $113,923,342 | |
| 5 | IRON |
Disc Medicine, Inc.
This page
|
1,513,875 | $110,724,817 | |
| 6 | QTTB |
Q32 Bio Inc.
|
2,717,106 | $34,615,930 | |
| 7 | KRRO |
Korro Bio, Inc.
|
962,884 | $12,690,811 |
All Filings in IRON
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19 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $110,724,817 | 1,513,875 | Shares | Sole | 2026-08-13 | |
| 2026-03-31 | $96,797,167 | 1,513,875 | Shares | Sole | 2026-05-14 | |
| 2025-12-31 | $120,216,813 | 1,513,875 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $141,584,131 | 2,142,617 | Shares | Sole | 2025-11-13 | |
| 2025-06-30 | $126,280,789 | 2,384,456 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $118,364,395 | 2,384,456 | Shares | Sole | 2025-05-14 | |
| 2024-12-31 | $159,099,510 | 2,509,456 | Shares | Sole | 2025-02-06 | |
| 2024-09-30 | $123,314,667 | 2,509,456 | Shares | Sole | 2024-11-13 | |
| 2024-06-30 | $113,101,181 | 2,509,456 | Shares | Sole | 2024-08-09 | |
| 2024-03-31 | $142,403,126 | 2,287,233 | Shares | Sole | 2024-05-06 | |
| 2023-12-31 | $147,586,734 | 2,555,172 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $128,975,838 | 2,745,335 | Shares | Sole | 2023-11-13 | |
| 2023-06-30 | $153,703,209 | 3,461,784 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $73,355,202 | 3,461,784 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $68,854,883 | 3,461,784 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 GMTX | — | 5,254,365 | Shares | Sole | 2022-11-09 | |
| 2022-06-30 GMTX | — | 5,254,365 | Shares | Sole | 2022-08-03 | |
| 2022-03-31 GMTX | — | 5,254,365 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 GMTX | — | 5,254,365 | Shares | Sole | 2022-05-16 | |
| No filing history on record for this holder in this stock. | ||||||