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MIRM in the 13F filings

Mirum Pharmaceuticals Inc · CUSIP 604749101

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
29
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 7 listed it in both
Shares listed
18,349,596
combined, among listed positions
Reported value
$1.7bn
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: 20 buyers (opened or added shares) and 11 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +3,793,698.

Managers listing MIRM in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

29 of 29 holders

ActionFiling
Janus Henderson Group Ltd6,945,813$642m0.31%Added+880,50518 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,965,375$182munder 0.1%Added+1,318,90915 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,717,421$159munder 0.1%Added+297,04615 May 2026 (the filing on sec.gov)
Wellington Management Group LLP1,334,809$123munder 0.1%Added+96,97915 May 2026 (the filing on sec.gov)
Citadel Advisors LLC1,052,048$97munder 0.1%Added+211,82815 May 2026 (the filing on sec.gov)
Two Sigma Investments LP774,841$72m0.06%Added+386,29915 May 2026 (the filing on sec.gov)
Capital World Investors724,415$67munder 0.1%Newnew13 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC582,085$54m0.08%Added+143,00014 May 2026 (the filing on sec.gov)
Woodline Partners LP567,894$52m0.20%Held015 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC539,031$50m0.06%Added+253,16115 May 2026 (the filing on sec.gov)
Millennium Management LLC368,575$34munder 0.1%Added+124,30215 May 2026 (the filing on sec.gov)
Point72 Asset Management LP346,991$32munder 0.1%Added+156,35315 May 2026 (the filing on sec.gov)
MFS Investment Management286,406$26munder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Invesco Ltd285,236$26munder 0.1%Added+220,28512 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.167,489$15munder 0.1%Trimmed-780,67215 May 2026 (the filing on sec.gov)
PDT Partners LLC145,379$13m0.79%Held015 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC104,099$9.6munder 0.1%Trimmed-193,85115 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP87,373$8.1m0.06%Newnew14 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC80,549$7.4munder 0.1%Newnew27 Oct 2026 (the filing on sec.gov)
Arrowstreet Capital LP67,885$6.3munder 0.1%Trimmed-304,62614 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC61,692$5.7munder 0.1%Trimmed-110,73415 May 2026 (the filing on sec.gov)
AllianceBernstein LP49,180$3.9munder 0.1%Added+5,73015 May 2026 (the filing on sec.gov)
AQR Capital Management LLC31,791$2.9munder 0.1%Trimmed-69415 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP24,317$2.2munder 0.1%Added+21,15715 May 2026 (the filing on sec.gov)
Polen Capital Management LLC20,531$1.9munder 0.1%Added+7,17114 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (5)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
3 in Q3 2024 to 10 in Q2 2026

Tracked managers listing it, at least.

0510152023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MIRM by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20201$1.7mn.a.n.a.
Q3 20221$7.5mn.a.n.a.
Q4 20221$7.0mn.a.n.a.
Q1 20232$26mn.a.n.a.
Q2 20232$24mn.a.n.a.
Q3 20233$87mn.a.n.a.
Q4 20232$68m11
Q1 20242$75m11
Q2 20243$179m21
Q3 20243$192m21
Q4 20243$211m30
Q1 20253$251m30
Q2 20254$304m40
Q3 202510$609m62
Q4 20258$613m1415
Q1 202611$1.1bn2011
Q2 202610$1.6bn1120

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MIRM and LLY →MIRM and JNJ →MIRM and VRTX →Choose a stock to compare with MIRM →

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 MIRM, latest filings →Back to the 13F Explorer →