Mirum Pharmaceuticals (mirm 4 05/01/29)
13F holders, Q1 2026 (March 31)4holders −1
1new positions
2sold out
$2.98avg. 13F price*
At the end of Q1 2026, 4 institutions reported holding Mirum Pharmaceuticals (mirm 4 05/01/29) in their 13F filings, down 1 from Q4 2025. 1 opened new positions and 2 sold out. The largest holders were Ssi Investment Management LLC ($9.7M), Sei Investments Co. ($680K) and Oppenheimer Asset Management Inc. ($188K).
- Company
- Mirum Pharmaceuticals (mirm 4 05/01/29)
- CUSIP
- 604749AB7
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 1 | $9.7M |
| Exits | 2 | $31K |
All 13F filers, Q4 2025 → Q1 2026: 3,255,000 shares bought and 13,000 shares sold, net +3,242,000 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 4 holders
| Ssi Investment Management LLC | 0.80% | New | 3,255,000 | $9.7M |
| Sei Investments Co. | 0.00% | No change | 228,000 | $680K |
| Oppenheimer Asset Management Inc. | 0.00% | Reduce -1.6% | 63,000 | $188K |
| Stephens Inc. | 0.00% | No change | 20,000 | $60K |
"% of holder's portfolio" is MIRUM PHARMACEUTICALS (MIRM 4 05/01/29)'s weight in each manager's 13F, not the share of Mirum Pharmaceuticals (mirm 4 05/01/29) the manager owns.