MP Materials counsel sells 13,914 shares in plan

MP Materials Corp. General Counsel and Secretary Elliot Dean Hoops sold 13,914 shares of Common Stock in an open-market transaction.

Rhea-AI Filing Summary

MP Materials Corp. General Counsel and Secretary Elliot Dean Hoops sold 13,914 shares of Common Stock in an open-market transaction. The shares were sold on March 16, 2026 at a weighted average price of $60.01 per share, with individual trades ranging from $60.00 to $60.10.

The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 20, 2025. After this sale, Hoops directly holds 61,053 shares of MP Materials common stock, and an additional 1,000 shares are held indirectly by his spouse.

Insider Trade Summary 10b5-1

Net Seller: 13,914 shares

Net Sell 2 txns

Insider Hoops Elliot Dean

Role General Counsel and Secretary

Sold 13,914 shs ($835K)

Type	Security	Shares	Price	Value
Sale	Common Stock	13,914	$60.01	$835K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 61,053 shares (Direct); Common Stock — 1,000 shares (Indirect, By Spouse)

Footnotes (2)

1. F1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 20, 2025.
2. F2. 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 $60.10. 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MP (MP Materials Corp.) report for Elliot Dean Hoops?

MP Materials reported that General Counsel and Secretary Elliot Dean Hoops sold 13,914 shares of Common Stock. The open-market sale occurred on March 16, 2026 at a weighted average price of $60.01 per share under a pre-arranged Rule 10b5-1 trading plan.

At what prices did Elliot Dean Hoops sell MP Materials (MP) shares?

The reported weighted average sale price was $60.01 per MP Materials share. According to the filing, individual trades were executed in a narrow range from $60.00 to $60.10 per share, reflecting a tightly clustered set of open-market transactions on March 16, 2026.

Was the MP (MP Materials) insider sale by Elliot Dean Hoops under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected under a Rule 10b5-1 trading plan adopted by Elliot Dean Hoops on November 20, 2025. Such pre-arranged plans automate trading and can reduce the informational significance of the exact sale timing.

How many MP Materials (MP) shares does Elliot Dean Hoops hold after the sale?

Following the reported sale, Elliot Dean Hoops directly holds 61,053 shares of MP Materials common stock. The filing also notes an additional 1,000 shares are held indirectly by his spouse, reflecting combined direct and indirect exposure after the March 16, 2026 transaction.

What role does Elliot Dean Hoops hold at MP Materials (MP) in this Form 4 filing?

In the Form 4, Elliot Dean Hoops is identified as an officer of MP Materials, serving as General Counsel and Secretary. This makes him a Section 16 reporting person, requiring prompt disclosure of his transactions in MP Materials common stock to the Securities and Exchange Commission.

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Accepted by SEC EDGAR 03/17/2026 - 08:20 PM EDT Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Hoops Elliot Dean

(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)
	General Counsel and Secretary

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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	03/16/2026		S(1)		13,914	D	$60.01(2)	61,053	D
Common Stock								1,000	I	By Spouse

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 November 20, 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 $60.10. 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	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.