IRON in the 13F filings
Disc Medicine Inc · CUSIP 254604101
- Quarter end
- 31 Mar 2026
- the date the book describes
- Filed
- 18 May 2026
- latest of these filings; the earliest 12 May 2026
- Managers listing it
- 18
- at least, of 95 tracked, among listed positions
- Comparable managers
- 91
- filed both Q4 2025 and Q1 2026; 2 listed it in both
- Shares listed
- 10,370,810
- combined, among listed positions
- Reported value
- $663m
- combined, at the quarter end
AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.
Among the 91 comparable managers: 9 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -209,507.
Managers listing IRON in Q1 2026
18 of 18 holders
Largest increases and reductions, by shares
Increases
- Wellington Management Group LLPexisting position · 1,735,376 shares now+217,102
- Fidelity (FMR LLC)existing position · 5,586,894 shares now+136,672
- Freestone Grove Partners LPnew position · 68,687 shares now+68,687
- Moore Capital Management LPnew position · 57,796 shares now+57,796
- Squarepoint Ops LLCexisting position · 31,709 shares now+15,955
Reductions
- T. Rowe Price Associates Incexisting position · 1,549,350 shares now-148,655
- Millennium Management LLCexisting position · 83,259 shares now-101,520
- Tudor Investment Corpexisting position · 31,002 shares now-35,123
- Renaissance Technologies LLCexisting position · 31,820 shares now-31,000
- Invesco Ltdexisting position · 30,638 shares now-30,432
New positions and exits
New (3)
Exited (5)
- Balyasny Asset Management LLCwas $18m
- Verition Fund Management LLCwas $5.0m
- ExodusPoint Capital Management LPwas $4.6m
- Arrowstreet Capital LPwas $617k
- Marshall Wace LLPwas $369k
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q2 2023 | 2 | $7.0m | n.a. | n.a. |
| Q3 2023 | 1 | $2.0m | n.a. | n.a. |
| Q4 2023 | 2 | $29m | 1 | 1 |
| Q1 2024 | 2 | $39m | 2 | 0 |
| Q2 2024 | 4 | $52m | 3 | 0 |
| Q3 2024 | 5 | $102m | 3 | 2 |
| Q4 2024 | 3 | $104m | 3 | 1 |
| Q1 2025 | 3 | $216m | 3 | 0 |
| Q2 2025 | 2 | $128m | 2 | 0 |
| Q3 2025 | 2 | $64m | 1 | 0 |
| Q4 2025 | 3 | $85m | 15 | 8 |
| Q1 2026 | 3 | $69m | 9 | 12 |
| Q2 2026 | 4 | $205m | 15 | 6 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
IRON and LLY →IRON and JNJ →IRON and VRTX →Choose a stock to compare with IRON →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own IRON, latest filings →Back to the 13F Explorer →