MP Materials (NYSE: MP) CFO sells 46,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

MP Materials Corp. Chief Financial Officer Ryan Corbett reported an open-market sale of 46,000 shares of common stock at a weighted average price of $60.00 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 16, 2025. After this transaction, Corbett directly holds 129,017 shares of MP Materials common stock.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Corbett Ryan

(Last) (First) (Middle)

1700 S. PAVILION CENTER DRIVE, SUITE 800

(Street)

LAS VEGAS NV 89135

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MP Materials Corp. / DE [ MP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/17/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/17/2026		S(1)		46,000	D	$60(2)	129,017	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 16, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.00 to $60.06. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

Remarks:

	/s/ Elliot D. Hoops, Attorney-In-Fact for Ryan Corbett	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did MP (MP Materials Corp.) disclose in this Form 4?

MP Materials disclosed that Chief Financial Officer Ryan Corbett sold 46,000 shares of common stock in an open-market transaction at a weighted average price of $60.00 per share, and continues to hold 129,017 shares directly after the sale.

Was the MP Materials (MP) CFO’s share sale made under a Rule 10b5-1 plan?

Yes. The filing states the CFO’s sales were executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 16, 2025, indicating the transactions were scheduled in advance rather than based on contemporaneous market or company-specific developments.

How many MP Materials (MP) shares does the CFO own after this reported sale?

Following the reported open-market sale of 46,000 shares, Chief Financial Officer Ryan Corbett directly holds 129,017 shares of MP Materials common stock, according to the Form 4 disclosure describing his remaining direct ownership position after the transaction.

At what price range were the MP (MP Materials) shares sold by the CFO?

The Form 4 reports a weighted average sale price of $60.00 per share, with individual trade prices ranging from $60.00 to $60.06. The CFO undertakes to provide full trade-by-trade pricing details upon request to the company, shareholders, or regulators.

What type of transaction code appears in the MP (MP Materials) CFO’s Form 4?

The transaction is coded “S,” indicating an open-market or private sale of common stock. This code reflects a disposition of shares rather than an option exercise, tax withholding, gift, or other non-market transaction type in the insider reporting framework.