Mirum Pharmaceuticals, Inc.
Mirum Pharmaceuticals, Inc. (MIRM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MIRM · as of Mar 31, 2025
Ownership Breakdown
218
Institutional Holders
▲ 10 vs Q4
$2.44B
Total Inst. Value
▲ $252.80M vs Q4
50.20M
Shares Outstanding
freeFloat 99.74%
54.14M
13F Shares Held
▲ 1.16M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MIRM largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FRAZIER LIFE SCIENCES MANAGEMENT, L.P. pharmaceutical preparations | 6.80M | 13.90% | 13.90% | $306.12B | May 15, 2025 | ▲ 224.7K |
JANUS HENDERSON GROUP PLC pharmaceutical preparations | 4.77M | 9.75% | 9.75% | $219.25B | May 15, 2025 | ▲ 184.5K |
BLACKROCK, INC. pharmaceutical preparations | 3.34M | 6.83% | 6.83% | $150.45B | May 2, 2025 | ▼ 95.1K |
BVF INC/IL pharmaceutical preparations | 2.80M | 5.72% | 5.72% | $125.98B | May 15, 2025 | — held |
VANGUARD GROUP INC pharmaceutical preparations | 2.54M | 5.20% | 5.20% | $114.43B | May 9, 2025 | ▲ 115.3K |
EVENTIDE ASSET MANAGEMENT, LLC pharmaceutical preparations | 2.53M | 5.17% | 5.17% | $113.85B | May 15, 2025 | ▼ 79.9K |
NOVO HOLDINGS A/S pharmaceutical preparations | 1.50M | 3.07% | 3.07% | $67.58B | May 15, 2025 | — held |
STATE STREET CORP pharmaceutical preparations | 1.49M | 3.06% | 3.06% | $67.33B | May 15, 2025 | ▲ 112.9K |
CITADEL ADVISORS LLC pharmaceutical preparations | 1.45M | 2.96% | 2.96% | $65.14B | May 15, 2025 | ▼ 65.2K |
PRICE T ROWE ASSOCIATES INC /MD/ pharmaceutical preparations | 1.42M | 2.89% | 2.89% | $63.75B | May 14, 2025 | ▼ 7.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
23
Increased
+3.39M shares3
New Positions
first time holders20
Decreased
−1.56M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.83M
+3.39M / −1.56M
Net new holders
+6
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MIRM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
7
Buy transactions
16
Sell transactions
0.44
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Peetz Christopher CHIEF EXECUTIVE OFFICER | Jun 1, 2026 | Sale | 2,602 | $94.64 | $246.3K | 221.7K | Form 4 ↗ |
Peetz Christopher CHIEF EXECUTIVE OFFICER | Jun 1, 2026 | Sale | 16,595 | $95.34 | $1.58M | 205.1K | Form 4 ↗ |
Peetz Christopher CHIEF EXECUTIVE OFFICER | Jun 1, 2026 | Sale | 6,926 | $96.15 | $665.9K | 198.2K | Form 4 ↗ |
Peetz Christopher CHIEF EXECUTIVE OFFICER | Jun 1, 2026 | Sale | 1,973 | $97.56 | $192.5K | 196.2K | Form 4 ↗ |
Peetz Christopher CHIEF EXECUTIVE OFFICER | Jun 1, 2026 | Sale | 1,021 | $98.20 | $100.3K | 195.2K | Form 4 ↗ |
Peetz Christopher CHIEF EXECUTIVE OFFICER | Jun 1, 2026 | Sale | 883 | $99.66 | $88.0K | 194.3K | Form 4 ↗ |
Ramasastry Saira director | Jun 1, 2026 | Sale | 3,977 | $100.00 | $397.7K | 0 | Form 4 ↗ |
Ramasastry Saira director | May 15, 2026 | Sale | 2,000 | $109.47 | $218.9K | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Mirum Pharmaceuticals, Inc. (MIRM) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 0.26%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Mirum Pharmaceuticals, Inc. is FRAZIER LIFE SCIENCES MANAGEMENT, L.P., holding approximately 6.80 million shares — equal to 13.90% of outstanding shares — as of March 31, 2025.
A total of 218 institutional investors currently hold MIRM stock, with a combined institutional value of approximately $2.44 billion as of the most recent 13F filing period.
Frequently asked questions
MIRM ownershipMirum Pharmaceuticals, Inc. (MIRM) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is FRAZIER LIFE SCIENCES MANAGEMENT, L.P. with a 13.90% stake. Company insiders hold 0.26%. Data sourced from SEC Form 13F as of March 31, 2025.