Mirum Pharmaceuticals, Inc.
DE ˙ DB ˙ US6047491013
77,12 € ↑0,96 (1,26%)
2026-06-05
DEL PRIS
SecurityDE:08D / Mirum Pharmaceuticals, Inc.
InstitutionRafferty Asset Management, LLC
Latest Disclosed Ownership49,160 shares
Latest Disclosed Value $ 4,541,401
Rafferty Asset Management, LLC reports 32.60% decrease in ownership of 08D / Mirum Pharmaceuticals, Inc.

On May 15, 2026 - Rafferty Asset Management, LLC filed a 13F-HR form disclosing ownership of 49,160 shares of Mirum Pharmaceuticals, Inc. (DE:08D) valued at $3,687,000 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 72,943 shares of Mirum Pharmaceuticals, Inc.. This represents a change in shares of -32.60% during the quarter. The current value of the position is $3,791,219 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)
2026-05-15 2026-03-31 13F MIRUM PHARMACEUTICALS COM 604749101 49,160 -23,783 -32.60 4,541 -21.18 0.0184
2026-02-13 2025-12-31 13F MIRUM PHARMACEUTICALS COM 604749101 72,943 39,816 120.19 5,762 137.27 0.0199
2025-11-12 2025-09-30 13F MIRUM PHARMACEUTICALS COM 604749101 33,127 -4,080 -10.97 2,429 28.26 0.0079
2025-08-14 2025-06-30 13F MIRUM PHARMACEUTICALS COM 604749101 37,207 -14,650 -28.25 1,893 -18.96 0.0062
2025-05-14 2025-03-31 13F MIRUM PHARMACEUTICALS COM 604749101 51,857 6,697 14.83 2,336 25.12 0.0100
2025-02-14 2024-12-31 13F MIRUM PHARMACEUTICALS COM 604749101 45,160 -40,297 -47.15 1,867 -43.97 0.0066
2024-11-13 2024-09-30 13F MIRUM PHARMACEUTICALS COM 604749101 85,457 16,599 24.11 3,333 41.55 0.0114
2024-08-13 2024-06-30 13F MIRUM PHARMACEUTICALS COM 604749101 68,858 -197,404 -74.14 2,354 -64.80 0.0087
2024-05-13 2024-03-31 13F MIRUM PHARMACEUTICALS COM 604749101 266,262 135,916 104.27 6,689 73.85 0.0250
2024-02-13 2023-12-31 13F MIRUM PHARMACEUTICALS COM 604749101 130,346 -6,859 -5.00 3,848 -11.26 0.0162
2023-11-13 2023-09-30 13F MIRUM PHARMACEUTICALS COM 604749101 137,205 21,312 18.39 4,336 44.60 0.0255
2023-08-11 2023-06-30 13F MIRUM PHARMACEUTICALS COM 604749101 115,893 29,732 34.51 2,998 44.90 0.0169
2023-05-11 2023-03-31 13F MIRUM PHARMACEUTICALS COM 604749101 86,161 -60,083 -41.08 2,070 -27.43 0.0140
2023-02-13 2022-12-31 13F MIRUM PHARMACEUTICALS COM 604749101 146,244 87,697 149.79 2,852 131.79 0.0239
2022-11-14 2022-09-30 13F MIRUM PHARMACEUTICALS COM 604749101 58,547 58,547 1,230 0.0131
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.