Form 13-F position report

DISC MEDICINE INC

Reported by Bain Capital Life Sciences Investors LLC

IRON CUSIP 254604101 Manager CIK 0001703031

First reported at 141,234 shares this quarter.

New
% of reported 13F value 0.81% This manager · Q1 2026
Shares 141,234 Quarter-end amount reported
Reported value $9,030,502 Fair value at quarter end
Consecutive quarters held 1 Through Q1 2026

Reported position value by quarter

Reported position value by quarter

Each bar is a Form 13-F quarter-end snapshot. It does not show trades made within the quarter.

Reported position value by quarter
Date Holding Value
2023-03-31 42187000
2023-06-30 59165131
2023-09-30 62602964
2023-12-31 76967799
2024-03-31 82009681
2024-06-30 80933776
2024-09-30 88242418
2024-12-31 62353900
2025-03-31 48820940
2025-06-30 30902160
2025-09-30 0
2026-03-31 9030502
2026-06-30 10329855

Quarterly position history

How this manager's reported quarter-end position changed over time.

13 quarters
Quarterly reported position history for DISC MEDICINE INC held by Bain Capital Life Sciences Investors LLC.
Quarter Activity Shares Change % of reported 13F Reported value Filed Source filing
Q2 2026 Unchanged 141,234 0 (0.0%) 0.61% $10,329,855 2026-08-14
Q1 2026 New 141,234 +141,234 (0.0%) 0.81% $9,030,502 2026-05-15
Q3 2025 Reduced 0 -583,500 (-100.0%) 0 $0 2025-11-14
Q2 2025 Reduced 583,500 -400,000 (-40.7%) 3.87% $30,902,160 2025-08-14
Q1 2025 Unchanged 983,500 0 (0.0%) 7.22% $48,820,940 2025-05-15
Q4 2024 Reduced 983,500 -812,235 (-45.2%) 7.33% $62,353,900 2025-02-14
Q3 2024 Unchanged 1,795,735 0 (0.0%) 9.18% $88,242,418 2024-11-14
Q2 2024 Added 1,795,735 +478,522 (36.3%) 8.89% $80,933,776 2024-08-12
Q1 2024 Reduced 1,317,213 -15,332 (-1.2%) 6.59% $82,009,681 2024-05-15
Q4 2023 Unchanged 1,332,545 0 (0.0%) 7.38% $76,967,799 2024-02-13
Q3 2023 Reduced 1,332,545 -3 (0.0%) 7.0% $62,602,964 2023-11-14
Q2 2023 Reduced 1,332,548 -658,366 (-33.1%) 6.09% $59,165,131 2023-08-14
Q1 2023 New 1,990,914 +1,990,914 (0.0%) 5.27% $42,187,000 2023-05-15

Who else reported the position

244 managers reported DISC MEDICINE INC for Q1 2026.

Managers reporting DISC MEDICINE INC in Q1 2026.
Manager Activity Shares Change % of reported 13F Reported value Tenure
FMR LLC Added 5,586,894 +136,672 0.02% $357,226,003 14 qtrs
RA CAPITAL MANAGEMENT L P Added 2,450,221 +474,089 1.66% $156,667,131 5 qtrs
BlackRock Inc Reduced 2,273,831 -1,149 < 0.01% $145,388,755 7 qtrs
WELLINGTON MANAGEMENT GROUP LLP Added 1,735,376 +217,102 0.02% $110,959,941 12 qtrs
STATE STREET CORPORATION Added 1,698,244 +510,253 < 0.01% $108,585,721 14 qtrs
PRICE T ROWE ASSOCIATES INC MD Reduced 1,549,350 -148,655 0.01% $99,067,000 12 qtrs
Atlas Venture Life Science Advisors LLC Unchanged 1,513,875 0 12.25% $96,797,168 14 qtrs
VANGUARD CAPITAL MANAGEMENT LLC New 1,375,430 +1,375,430 < 0.01% $87,944,994 1 qtr
Frazier Life Sciences Management L P Added 1,354,852 +94,852 2.23% $86,629,237 12 qtrs
TCG Crossover Management LLC New 1,341,862 +1,341,862 2.45% $85,798,656 8 qtrs
Premium adds each manager's conviction percentile across reporting peers.
Filing details and methodology As reported
Report period
March 31, 2026
Filed
May 15, 2026
Filing type
13F-HR
Position type
COM

Voting authority reported

Sole
141,234
Shared
0
None
0

“None” means the manager reported no voting authority for those shares on non-routine matters. It does not disclose why and is not evidence of securities lending.

Form 13-F is a delayed quarter-end snapshot of disclosed long Section 13(f) securities. It can be filed up to 45 days after quarter end, excludes short positions and most non-U.S. securities, and does not reveal intra-quarter trading. For options, reported shares and value describe the underlying-share exposure; strike, expiry, premium, and written positions are not disclosed.