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Mirum Pharmaceuticals, Inc.

MIRM
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001759425

In the last 90 days, Mirum Pharmaceuticals, Inc. insiders filed 0 open-market purchases and 10 sales; 326 institutions reported holding it in 13F filings for Q2 2026, worth $8.36B in total; no superinvestor holds it.

Holders of 5% or more of MIRM

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mirum Pharmaceuticals, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of MIRM
HolderLatest formStakeChangeFirst filedLatest filingFiling
Janus Henderson Group PLC13G/A14.30%22.7M shares+3.30 ppfrom 11.00%Feb 14, 20252 filingsMay 14, 2025SEC
Janus Henderson Group PLC13G/A9.70%5.91M shares−2.10 ppfrom 11.80%Feb 14, 20259 filingsAug 13, 2026SEC
Frazier Life Sciences IX, L.P.13D/A6.80%4.11M shares−0.80 ppfrom 7.60%Aug 20, 20253 filingsJan 27, 2026SEC
FMR LLC13G6.20%3.78M sharesNewAug 6, 20261 filingAug 6, 2026SEC
BlackRock, Inc.13G/A5.70%3.47M shares–Apr 27, 20261 filingApr 27, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

21 Schedule 13D and 13G filings on Mirum Pharmaceuticals, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on MIRM
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 13, 202612:47 PM ETJanus Henderson Group PLC13G/A9.70%5.91M shares−2.10 ppfrom 11.80%Jun 30, 2026SEC
Aug 6, 202610:33 AM ETFMR LLCand 1 other13G6.20%3.78M sharesNewJun 30, 2026SEC
Apr 27, 20264:12 PM ETBlackRock, Inc.13G/A5.70%3.47M shares–Mar 31, 2026SEC
Mar 27, 202610:52 AM ETVanguard Group Inc13G/A0.00%0 shares–Below 5%Mar 13, 2026SEC
Feb 17, 20264:33 PM ETJanus Henderson Group PLC13G/A11.80%6.07M shares+1.20 ppfrom 10.60%Dec 31, 2025SEC
Feb 13, 20261:09 PM ETEventide Asset Management, LLCand 2 others13G/A4.10%2.09M shares−1.33 ppfrom 5.43%Below 5%Dec 31, 2025SEC
Jan 27, 20264:12 PM ETFrazier Life Sciences IX, L.P.and 16 others13D/A6.80%4.11M shares−0.80 ppfrom 7.60%Jan 23, 2026SEC
Dec 5, 202512:46 PM ETJanus Henderson Group PLC13G/A10.60%5.45M shares+0.60 ppfrom 10.00%Nov 28, 2025SEC
Nov 14, 20254:14 PM ETBiotechnology Value Fund L Pand 9 others13G/A3.00%1.50M shares–Below 5%Sep 30, 2025SEC
Nov 14, 202512:03 PM ETJanus Henderson Group PLC13G/A10.00%5.00M shares−0.60 ppfrom 10.60%Sep 30, 2025SEC
Nov 4, 20255:26 PM ETFrazier Life Sciences IX, L.P.and 13 others13D/A7.60%3.74M shares0.00 ppfrom 7.60%Nov 1, 2025SEC
Aug 20, 20255:17 PM ETFrazier Life Sciences IX, L.P.and 19 others13D/A7.60%3.74M shares–Aug 18, 2025SEC
Aug 14, 202511:15 AM ETJanus Henderson Group PLC13G/A10.60%5.24M shares+0.30 ppfrom 10.30%Jun 30, 2025SEC
Jun 6, 202511:59 AM ETJanus Henderson Group PLC13G/A10.30%5.08M shares+0.60 ppfrom 9.70%May 30, 2025SEC
May 15, 20253:32 PM ETJanus Henderson Group PLC13G/A9.70%4.78M shares−0.40 ppfrom 10.10%Mar 31, 2025SEC
May 14, 202511:59 AM ETJanus Henderson Group PLCand 1 other13G/A14.30%22.7M shares+3.30 ppfrom 11.00%Mar 31, 2025SEC
May 7, 202510:57 AM ETJanus Henderson Group PLC13G/A10.10%5.00M shares+0.60 ppfrom 9.50%Apr 30, 2025SEC
Feb 14, 202512:11 PM ETJanus Henderson Group PLC13G/A9.50%4.58M shares–Dec 31, 2024SEC
Feb 14, 202512:09 PM ETJanus Henderson Group PLCand 1 other13G/A11.00%17.1M shares–Dec 31, 2024SEC
Feb 14, 202512:06 PM ETEventide Asset Management, LLCand 2 others13G/A5.43%2.61M shares–Dec 31, 2024SEC
Feb 14, 202512:01 PM ETEventide Asset Management, LLCand 2 others13G/A3.46%2.22M shares–Below 5%Dec 31, 2024SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Mirum Pharmaceuticals, Inc. shares.

No Form 144 notices for Mirum Pharmaceuticals, Inc. are on file.