MP Materials director granted 3,038 RSUs

WEISENBURGER RANDALL J reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

WEISENBURGER RANDALL J reported acquisition or exercise transactions in this Form 4 filing.

MP Materials Corp. director Randall J. Weisenburger received a grant of 3,038 restricted stock units, each tied to one share of common stock. This is a compensation award, not an open‑market purchase or sale.

The RSUs vest on the earlier of June 15, 2027 or the next annual stockholder meeting, as long as he continues serving as a director through that date. Settlement into shares occurs on the earlier of June 15 following the fifth anniversary of vesting, a qualifying change in control event, or his separation from service. The RSUs fully vest if there is a change in control of MP Materials or if his board service ends due to death or disability.

Insider Trade Summary

Grant/Award: 3,038 shares

Grant/Award 1 txn

Insider WEISENBURGER RANDALL J

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	3,038	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 3,038 contracts (Direct)

Footnotes (1)

1. F1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of MP Materials Corp. ("Issuer") common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a "change in control event" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability.

Key Figures

RSUs granted: 3,038 units Underlying shares: 3,038 shares Exercise/Conversion price: $0.00 per unit +1 more

4 metrics

RSUs granted 3,038 units Restricted stock units granted on June 9, 2026

Underlying shares 3,038 shares Common stock underlying granted RSUs

Exercise/Conversion price $0.00 per unit RSU grant price recorded on Form 4

Vesting date trigger June 15, 2027 Latest time-based vesting date for the RSUs

Key Terms

Restricted Stock Units, RSU, change in control event, Section 409A of the Internal Revenue Code

4 terms

Restricted Stock Units financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one share..."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSU financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one share..."

Restricted stock units (RSUs) are a form of company shares given to employees as part of their compensation, usually with certain restrictions or conditions, such as remaining with the company for a set period. When these restrictions lift, employees receive actual shares that they can sell or hold. For investors, RSUs can impact a company's stock supply and reflect the company's commitment to attracting and retaining talent.

change in control event financial

"a "change in control event" within the meaning of Section 409A of the Internal Revenue Code"

Section 409A of the Internal Revenue Code financial

"within the meaning of Section 409A of the Internal Revenue Code"

FAQ

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

What did MP (MP Materials Corp.) director Randall Weisenburger report on this Form 4?

He reported receiving 3,038 restricted stock units as a compensation award. Each unit represents a contingent right to one share of MP Materials common stock, subject to vesting conditions and delayed settlement timing set out in the award terms.

How many MP restricted stock units were granted to the director on June 9, 2026?

The director received 3,038 restricted stock units on June 9, 2026. These units convert into an equal number of common shares only after vesting and later settlement events, so they do not immediately increase the director’s freely tradable share count.

When do Randall Weisenburger’s MP restricted stock units vest?

The RSUs vest on the earlier of June 15, 2027 or the next annual meeting of MP Materials stockholders. Vesting requires his continued service as a director through that vesting date, aligning the award with ongoing board service.

Under what conditions are the MP RSUs settled into common stock?

Once vested, the RSUs are settled into common stock at the earliest of three events: June 15 following the fifth anniversary of vesting, a qualifying change in control event, or the director’s separation from service, as defined under Section 409A rules.

Do the MP restricted stock units vest faster if there is a change in control?

Yes. The RSUs fully vest upon a change in control of MP Materials. They also fully vest if the director’s service ends because of death or disability, accelerating vesting compared with the standard time‑based or meeting‑based schedule.

Is this MP Form 4 transaction an open‑market buy or sell of shares?

No. The filing shows a grant of restricted stock units as compensation, not an open‑market trade. The transaction code is “A” for grant or award, and the price per unit is recorded as zero dollars, reflecting its compensatory nature.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/10/2026 - 08:50 PM 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).

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^*

WEISENBURGER RANDALL J

(Last) (First) (Middle)

1700 S. PAVILION CENTER DRIVE, SUITE 800

(Street)

LAS VEGAS NEVADA 89135

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/09/2026

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

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

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

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

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
Restricted Stock Units	(1)	06/09/2026		A		3,038		(1)	(1)	Common Stock	3,038	$0	3,038	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of MP Materials Corp. ("Issuer") common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a "change in control event" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability.

Remarks:

	/s/ Elliot D. Hoops, Attorney-In-Fact for Randall J. Weisenburger	06/10/2026
	** 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.
* Form 4: SEC 1474 (03-26)