Mirum Pharmaceuticals, Inc.
DE ˙ DB ˙ US6047491013
77,12 € ↑0,96 (1,26%)
2026-06-05
DEL PRIS
SecurityDE:08D / Mirum Pharmaceuticals, Inc.
InstitutionClearbridge Investments, LLC
Latest Disclosed Ownership671,870 shares
Latest Disclosed Value $ 62,067,323
Clearbridge Investments, LLC reports 22.41% decrease in ownership of 08D / Mirum Pharmaceuticals, Inc.

On May 13, 2026 - Clearbridge Investments, LLC filed a 13F-HR form disclosing ownership of 671,870 shares of Mirum Pharmaceuticals, Inc. (DE:08D) valued at $50,390,250 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 865,967 shares of Mirum Pharmaceuticals, Inc.. This represents a change in shares of -22.41% during the quarter. The current value of the position is $51,814,614 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F Mirum Pharmaceuticals COM 604749101 671,870 -194,097 -22.41 62,067 -9.26 0.0486
2026-02-11 2025-12-31 13F Mirum Pharmaceuticals COM 604749101 865,967 -137,836 -13.73 68,403 -7.05 0.0548
2025-11-13 2025-09-30 13F Mirum Pharmaceuticals COM 604749101 1,003,803 -23,724 -2.31 73,589 40.73 0.0554
2025-08-12 2025-06-30 13F Mirum Pharmaceuticals COM 604749101 1,027,527 49,460 5.06 52,291 18.68 0.0425
2025-05-13 2025-03-31 13F Mirum Pharmaceuticals COM 604749101 978,067 70,750 7.80 44,062 17.44 0.0385
2025-02-12 2024-12-31 13F Mirum Pharmaceuticals COM 604749101 907,317 18,217 2.05 37,518 8.20 0.0304
2024-11-12 2024-09-30 13F Mirum Pharmaceuticals COM 604749101 889,100 189,167 27.03 34,675 44.90 0.0273
2024-08-27 2024-06-30 13F/A-1 Mirum Pharmaceuticals COM 604749101 699,933 436,349 165.54 23,931 261.43 0.0194
2024-08-14 2024-06-30 13F Mirum Pharmaceuticals COM 604749101 699,933 436,349 23,931 0.0196
2024-05-13 2024-03-31 13F Mirum Pharmaceuticals COM 604749101 263,584 -513 -0.19 6,621 -15.07 0.0052
2024-02-09 2023-12-31 13F Mirum Pharmaceuticals COM 604749101 264,097 247,933 1,533.86 7,796 1,428.63 0.0067
2023-11-13 2023-09-30 13F Mirum Pharmaceuticals COM 604749101 16,164 -4,400 -21.40 511 -3.95 0.0005
2023-08-11 2023-06-30 13F Mirum Pharmaceuticals COM 604749101 20,564 -30,381 -59.63 532 -56.58 0.0005
2023-05-12 2023-03-31 13F Mirum Pharmaceuticals COM 604749101 50,945 19,790 63.52 1,224 101.48 0.0012
2023-02-10 2022-12-31 13F Mirum Pharmaceuticals COM 604749101 31,155 10,470 50.62 608 39.54 0.0006
2022-11-14 2022-09-30 13F Mirum Pharmaceuticals COM 604749101 20,685 -12 -0.06 435 7.94 0.0004
2022-08-11 2022-06-30 13F Mirum Pharmaceuticals COM 604749101 20,697 0 0.00 403 -11.62 0.0004
2022-05-13 2022-03-31 13F Mirum Pharmaceuticals COM 604749101 20,697 20,697 456 0.0003
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.