MIRM
Mirum Pharmaceuticals, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth +22.2% ·
share flow +10.4% ·
net new positions +18.2%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 106 | +2 | 35.68M | $4.18B | +9 | −7 |
| Q1 2026 | 107 | +6 | 39.52M | $3.63B | +12 | −7 |
| Q4 2025 | 102 | +1 | 36.05M | $2.83B | +2 | — |
| Q3 2025 | 20 | 0 | 17.64M | $1.29B | — | — |
| Q2 2025 | 17 | +1 | 13.61M | $692.65M | +2 | −1 |
| Q1 2025 | 13 | +1 | 7.45M | $335.67M | +2 | −1 |
| Q4 2024 | 12 | 0 | 6.63M | $274.04M | +1 | −1 |
| Q3 2024 | 11 | +2 | 4.84M | $188.84M | +2 | — |
| Q2 2024 | 9 | — | 4.39M | $149.94M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Citadel Advisors ✦ | 1.39M | -12.2% | $54.26M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 2 | T. Rowe Price ✦ | 1.28M | +7.1% | $50.08M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | T. Rowe Price ✦ | 1.28M | +7.1% | $50.08M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 936.20K | +3.2% | $36.52M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 936.20K | +3.2% | $36.52M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 6 | Millennium Management ✦ | 455.56K | +71.6% | $17.77M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 7 | Norges Bank ✦ (passive) | 248.16K | New | $9.68M | 0.0% | New | 1 | SEC ↗ |
| 8 | Two Sigma Investments ✦ | 227.47K | +39.1% | $8.87M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | Wellington Management ✦ | 122.33K | +62.2% | $4.77M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | Wellington Management ✦ | 122.33K | +62.2% | $4.77M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | Wellington Management ✦ | 122.33K | +62.2% | $4.77M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | Wellington Management ✦ | 122.33K | +62.2% | $4.77M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 13 | Adage Capital Partners ✦ | 80.00K | -50.0% | $3.12M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 14 | Renaissance Technologies ✦ | 60.45K | New | $2.36M | 0.0% | New | 1 | SEC ↗ |
| 15 | Marshall Wace ✦ | 23.72K | +15.6% | $925,158 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 16 | AQR Capital Management ✦ | 12.54K | +51.2% | $489,255 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 17 | AQR Capital Management ✦ | 12.54K | +51.2% | $489,255 | 0.0% | ▲ Add | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $9.68M | 0.0% |
| Renaissance Technologies | $2.36M | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 308 holders, 67.83M shares, $6.01B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 40.00K sh · $4.00M
Officer · 6.00K sh · $599,510
Officer, Director · 11.68K sh · $1.15M
Officer, Director · 6.02K sh · $597,187
Officer, Director · 2.30K sh · $230,322
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology