MP Materials Corp.
US ˙ NYSE ˙ US5533681012

SecurityMP / MP Materials Corp.
InstitutionHolocene Advisors, LP
Latest Disclosed Ownership45,048 shares
Latest Disclosed Value $ 2,174,016
Holocene Advisors, LP ownership in MP / MP Materials Corp.

On May 15, 2026 - Holocene Advisors, LP filed a 13F-HR form disclosing ownership of 45,048 shares of MP Materials Corp. (US:MP) valued at $2,174,016 USD as of March 31, 2026. The entity filed a previous 13F-HR on May 15, 2025 disclosing 0 shares of MP Materials Corp.. The current value of the position is $3,088,040 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 MP MATERIALS COM CL A 553368101 45,048 45,048 2,174 0.0052
2025-05-15 2025-03-31 13F MP MATERIALS COM CL A 553368101 0 -151,599 -100.00 0 -100.00
2025-02-14 2024-12-31 13F MP MATERIALS COM CL A 553368101 151,599 -190,141 -55.64 2,365 -60.80 0.0076
2024-11-14 2024-09-30 13F MP MATERIALS COM CL A 553368101 341,740 -21,449 -5.91 6,032 30.46 0.0244
2024-08-14 2024-06-30 13F MP MATERIALS COM CL A 553368101 363,189 -120,698 -24.94 4,623 -33.18 0.0193
2024-05-15 2024-03-31 13F MP MATERIALS COM CL A 553368101 483,887 196,908 68.61 6,920 21.47 0.0254
2024-02-14 2023-12-31 13F MP MATERIALS COM CL A 553368101 286,979 -4,346 -1.49 5,697 2.37 0.0222
2023-11-14 2023-09-30 13F MP MATERIALS COM CL A 553368101 291,325 49,488 20.46 5,564 0.56 0.0244
2023-08-14 2023-06-30 13F MP MATERIALS COM CL A 553368101 241,837 202,096 508.53 5,533 394.02 0.0236
2023-05-15 2023-03-31 13F MP MATERIALS COM CL A 553368101 39,741 39,741 1,120 0.0055
2021-11-15 2021-09-30 13F MP MATERIALS COM CL A 553368101 0 -20,643 -100.00 0 -100.00
2021-08-16 2021-06-30 13F MP MATERIALS COM CL A 553368101 20,643 20,643 761 0.0043
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.