[Form 4] MP Materials Corp. / DE Insider Trading Activity

Rhea-AI Filing Summary

MP Materials director Connie K. Duckworth exercised previously granted equity awards to receive common shares. On June 15, 2026, 3,998 restricted stock units converted into 3,998 shares of common stock on a one-for-one basis. These RSUs were originally granted on November 17, 2020, vested on June 1, 2021, and delivery of the shares was deferred until June 15, 2026. Following this deferred settlement, Duckworth directly holds 41,150 shares of MP Materials common stock. The filing reflects an exercise and settlement of compensation awards, not an open-market purchase or sale.

Insider Trade Summary

3,998 shares exercised/converted

Mixed 2 txns

Insider DUCKWORTH CONNIE K

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	3,998	$0.00	--
Exercise	Common Stock	3,998	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 41,150 shares (Direct, null)

Footnotes (1)

1. Restricted stock units convert into common stock on a one-for-one basis. On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

Key Figures

RSUs settled: 3,998 units Common shares received: 3,998 shares Post-transaction holdings: 41,150 shares +3 more

6 metrics

RSUs settled 3,998 units Restricted stock units converting into common stock on June 15, 2026

Common shares received 3,998 shares One-for-one conversion of restricted stock units into MP Materials common stock

Post-transaction holdings 41,150 shares Direct ownership by Connie Duckworth after June 15, 2026 settlement

Grant date of RSUs November 17, 2020 Original grant date of 3,998 restricted stock units

Vesting date of RSUs June 1, 2021 Date the 3,998 restricted stock units vested

Exercise price $0.00 per unit Conversion of restricted stock units into common stock with no cash payment

Key Terms

Restricted stock units, Common Stock, derivative security

3 terms

Restricted stock units financial

"The reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021"

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.

Common Stock financial

"Restricted stock units convert into common stock on a one-for-one basis"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

derivative security financial

"Transaction code description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

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Form 4 Insider Transactions: What Each Field Means →

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^*

DUCKWORTH CONNIE K

(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)
06/15/2026

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
Common Stock	06/15/2026		M		3,998	A	(1)	41,150	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
Restricted Stock Units	(2)	06/15/2026		M			3,998	(2)	(2)	Common Stock	3,998	$0	0	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

Remarks:

	/s/ Elliot D. Hoops, Attorney-In-Fact for Connie K. Duckworth	06/15/2026
	** 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)

FAQ

What insider transaction did MP (MP) report for Connie K. Duckworth?

MP Materials reported that director Connie K. Duckworth received 3,998 common shares when previously granted restricted stock units settled. The June 15, 2026 transaction reflects an equity award settlement, not an open-market stock purchase or sale.

How many MP (MP) shares did Connie Duckworth acquire in this Form 4?

Connie Duckworth acquired 3,998 MP Materials common shares through the conversion of restricted stock units. These units converted into common stock on a one-for-one basis as part of a deferred settlement of her prior equity compensation grant.

What was the origin of the 3,998 restricted stock units reported by MP (MP)?

The 3,998 restricted stock units were granted to Connie Duckworth on November 17, 2020 as equity compensation. They vested on June 1, 2021, but delivery of the underlying common shares was deferred until June 15, 2026.

Did Connie Duckworth sell any MP (MP) shares in this Form 4 filing?

The Form 4 shows no sales of MP Materials shares by Connie Duckworth. It records only the conversion of 3,998 restricted stock units into common stock, an acquisition event rather than an open-market sale transaction.

How many MP (MP) shares does Connie Duckworth hold after this transaction?

After the settlement of 3,998 restricted stock units into common shares, Connie Duckworth directly holds 41,150 MP Materials common shares. This reflects her updated direct ownership position following the June 15, 2026 equity award settlement.

What does the zero exercise price mean in Connie Duckworth’s MP (MP) Form 4?

The zero exercise price indicates these were restricted stock units, not stock options with a strike price. Each unit converted into one MP Materials common share without additional cash payment upon settlement of the vested award.