MP Materials Corp.
US ˙ NYSE ˙ US5533681012

SecurityMP / MP Materials Corp.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership257,413 shares
Latest Disclosed Value $ 12,422,751
Citadel Advisors Llc ownership in MP / MP Materials Corp.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 257,413 shares of MP Materials Corp. (US:MP) valued at $12,422,751 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of MP Materials Corp.. The current value of the position is $17,645,661 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (MP) in the form of stock options. The firm currently holds call options representing 3,462,600 of underlying shares valued at $167,105,076 USD and put options representing 2,274,600 of underlying shares valued at $109,772,196 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MP / MP Materials Corp. Historical Put/Call Ratio
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 257,413 257,413 12,423 0.0020
2026-02-17 2025-12-31 13F MP MATERIALS COM CL A 553368101 0 -70,329 -100.00 0 -100.00
2025-11-14 2025-09-30 13F MP MATERIALS COM CL A 553368101 70,329 -715,688 -91.05 4,717 -81.97 0.0007
2025-08-14 2025-06-30 13F MP MATERIALS COM CL A 553368101 786,017 476,375 153.85 26,151 245.99 0.0045
2025-05-15 2025-03-31 13F MP MATERIALS COM CL A 553368101 309,642 19,484 6.71 7,558 66.99 0.0014
2025-02-14 2024-12-31 13F MP MATERIALS COM CL A 553368101 290,158 278,981 2,496.03 4,526 2,197.46 0.0008
2024-11-14 2024-09-30 13F MP MATERIALS COM CL A 553368101 11,177 -146,878 -92.93 197 -90.21 0.0000
2024-08-14 2024-06-30 13F MP MATERIALS COM CL A 553368101 158,055 -373,137 -70.25 2,012 -73.51 0.0004
2024-05-15 2024-03-31 13F MP MATERIALS COM CL A 553368101 531,192 516,780 3,585.76 7,596 2,555.94 0.0015
2024-02-14 2023-12-31 13F MP MATERIALS COM CL A 553368101 14,412 -621,827 -97.73 286 -97.65 0.0001
2023-11-14 2023-09-30 13F MP MATERIALS COM CL A 553368101 636,239 91,361 16.77 12,152 -2.52 0.0026
2023-08-14 2023-06-30 13F MP MATERIALS COM CL A 553368101 544,878 241,272 79.47 12,467 45.66 0.0026
2023-05-15 2023-03-31 13F MP MATERIALS COM CL A 553368101 303,606 -315,428 -50.95 8,559 -43.06 0.0019
2023-02-14 2022-12-31 13F MP MATERIALS COM CL A 553368101 619,034 583,483 1,641.26 15,030 1,447.89 0.0035
2022-11-14 2022-09-30 13F MP MATERIALS COM CL A 553368101 35,551 -46,496 -56.67 971 -63.11 0.0002
2022-08-15 2022-06-30 13F MP MATERIALS COM CL A 553368101 82,047 -46,865 -36.35 2,632 -64.39 0.0007
2022-05-16 2022-03-31 13F MP MATERIALS COM CL A 553368101 128,912 53,268 70.42 7,392 115.13 0.0015
2022-02-14 2021-12-31 13F MP MATERIALS COM CL A 553368101 75,644 29,737 64.78 3,436 132.16 0.0007
2021-11-15 2021-09-30 13F MP MATERIALS Cmn 553368101 45,907 -199 -0.43 1,480 -12.89 0.0003
2021-08-16 2021-06-30 13F MP MATERIALS COM CL A 553368101 46,106 -48,495 -51.26 1,699 -50.04 0.0004
2021-05-21 2021-03-31 13F/A-1 MP MATERIALS COM CL A 553368101 94,601 53,627 130.88 3,401 158.04 0.0008
2021-05-17 2021-03-31 13F MP MATERIALS COM CL A 553368101 94,601 53,627 3,401 0.0008
2021-02-16 2020-12-31 13F MP MATERIALS COM CL A 553368101 40,974 40,974 1,318 0.0003
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F MP MATERIALS COM CL A Call 3,462,600 -6.85 167,105 -11.02 n/a n/a n/a
2026-02-17 2025-12-31 13F MP MATERIALS COM CL A Call 3,717,200 6.31 187,793 -19.92 n/a n/a n/a
2025-11-14 2025-09-30 13F MP MATERIALS COM CL A Call 3,496,500 479.75 234,510 1,068.75 n/a n/a n/a
2025-08-14 2025-06-30 13F MP MATERIALS COM CL A Call 603,100 155.88 20,065 248.77 n/a n/a n/a
2025-05-15 2025-03-31 13F MP MATERIALS COM CL A Call 235,700 -50.16 5,753 -22.01 n/a n/a n/a
2025-02-14 2024-12-31 13F MP MATERIALS COM CL A Call 472,900 -45.66 7,377 -51.97 n/a n/a n/a
2024-11-14 2024-09-30 13F MP MATERIALS COM CL A Call 870,300 6.48 15,361 47.64 n/a n/a n/a
2024-08-14 2024-06-30 13F MP MATERIALS COM CL A Call 817,300 -16.03 10,404 -25.25 n/a n/a n/a
2024-05-15 2024-03-31 13F MP MATERIALS COM CL A Call 973,300 52.32 13,918 9.73 n/a n/a n/a
2024-02-14 2023-12-31 13F MP MATERIALS COM CL A Call 639,000 -8.51 12,684 -4.91 n/a n/a n/a
2023-11-14 2023-09-30 13F MP MATERIALS COM CL A Call 698,400 4.82 13,339 -12.50 n/a n/a n/a
2023-08-14 2023-06-30 13F MP MATERIALS COM CL A Call 666,300 -32.37 15,245 -45.11 n/a n/a n/a
2023-05-15 2023-03-31 13F MP MATERIALS COM CL A Call 985,200 38.64 27,773 60.97 n/a n/a n/a
2023-02-14 2022-12-31 13F MP MATERIALS COM CL A Call 710,600 -17.54 17,253 -26.66 n/a n/a n/a
2022-11-14 2022-09-30 13F MP MATERIALS COM CL A Call 861,700 28.98 23,524 9.76 n/a n/a n/a
2022-08-15 2022-06-30 13F MP MATERIALS COM CL A Call 668,100 -9.53 21,433 -49.39 n/a n/a n/a
2022-05-16 2022-03-31 13F MP MATERIALS COM CL A Call 738,500 206.18 42,346 286.54 n/a n/a n/a
2022-02-14 2021-12-31 13F MP MATERIALS COM CL A Call 241,200 -45.92 10,955 -23.79 n/a n/a n/a
2021-11-15 2021-09-30 13F MP MATERIALS Cmn Call 446,000 8.60 14,375 -5.04 n/a n/a n/a
2021-08-16 2021-06-30 13F MP MATERIALS COM CL A Call 410,700 -6.64 15,138 -4.27 n/a n/a n/a
2021-05-21 2021-03-31 13F/A MP MATERIALS COM CL A Call 439,900 88.80 15,814 110.97 n/a n/a n/a
2021-05-17 2021-03-31 13F MP MATERIALS COM CL A Call 439,900 15,814 n/a n/a n/a
2021-02-16 2020-12-31 13F MP MATERIALS COM CL A Call 233,000 7,496 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F MP MATERIALS COM CL A Put 2,274,600 -29.49 109,772 -32.64 n/a n/a n/a
2026-02-17 2025-12-31 13F MP MATERIALS COM CL A Put 3,225,800 -16.26 162,967 -36.92 n/a n/a n/a
2025-11-14 2025-09-30 13F MP MATERIALS COM CL A Put 3,852,200 430.75 258,367 969.98 n/a n/a n/a
2025-08-14 2025-06-30 13F MP MATERIALS COM CL A Put 725,800 131.59 24,147 215.65 n/a n/a n/a
2025-05-15 2025-03-31 13F MP MATERIALS COM CL A Put 313,400 -75.19 7,650 -61.19 n/a n/a n/a
2025-02-14 2024-12-31 13F MP MATERIALS COM CL A Put 1,263,400 31.96 19,709 16.64 n/a n/a n/a
2024-11-14 2024-09-30 13F MP MATERIALS COM CL A Put 957,400 -17.98 16,898 13.72 n/a n/a n/a
2024-08-14 2024-06-30 13F MP MATERIALS COM CL A Put 1,167,300 18.65 14,860 5.62 n/a n/a n/a
2024-05-15 2024-03-31 13F MP MATERIALS COM CL A Put 983,800 152.97 14,068 82.25 n/a n/a n/a
2024-02-14 2023-12-31 13F MP MATERIALS COM CL A Put 388,900 -27.06 7,720 -24.20 n/a n/a n/a
2023-11-14 2023-09-30 13F MP MATERIALS COM CL A Put 533,200 147.20 10,184 106.36 n/a n/a n/a
2023-08-14 2023-06-30 13F MP MATERIALS COM CL A Put 215,700 -69.06 4,935 -74.89 n/a n/a n/a
2023-05-15 2023-03-31 13F MP MATERIALS COM CL A Put 697,100 103.65 19,651 136.45 n/a n/a n/a
2023-02-14 2022-12-31 13F MP MATERIALS COM CL A Put 342,300 38.58 8,311 23.25 n/a n/a n/a
2022-11-14 2022-09-30 13F MP MATERIALS COM CL A Put 247,000 -49.69 6,743 -57.19 n/a n/a n/a
2022-08-15 2022-06-30 13F MP MATERIALS COM CL A Put 491,000 71.50 15,751 -4.05 n/a n/a n/a
2022-05-16 2022-03-31 13F MP MATERIALS COM CL A Put 286,300 -9.48 16,416 14.27 n/a n/a n/a
2022-02-14 2021-12-31 13F MP MATERIALS COM CL A Put 316,300 146.34 14,366 247.17 n/a n/a n/a
2021-11-15 2021-09-30 13F MP MATERIALS Cmn Put 128,400 111.53 4,138 84.98 n/a n/a n/a
2021-08-16 2021-06-30 13F MP MATERIALS COM CL A Put 60,700 -71.57 2,237 -70.85 n/a n/a n/a
2021-05-21 2021-03-31 13F/A MP MATERIALS COM CL A Put 213,500 29.87 7,675 45.11 n/a n/a n/a
2021-05-17 2021-03-31 13F MP MATERIALS COM CL A Put 213,500 7,675 n/a n/a n/a
2021-02-16 2020-12-31 13F MP MATERIALS COM CL A Put 164,400 5,289 n/a n/a n/a
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.