MP Materials CFO sells 20,000 shares under plan

MP Materials Corp. Chief Financial Officer Ryan Corbett reported an open-market sale of 20,000 shares of common stock at a weighted average price of about $75 per share.

Rhea-AI Filing Summary

MP Materials Corp. Chief Financial Officer Ryan Corbett reported an open-market sale of 20,000 shares of common stock at a weighted average price of about $75 per share. After the transaction, he directly owns 109,017 shares.

The sale on May 8, 2026 was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 16, 2025. The filing notes that individual trades were completed at prices between $75.00 and $75.09, and detailed price breakdowns are available on request.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares

Net Sell 1 txn

Insider Corbett Ryan

Role Chief Financial Officer

Sold 20,000 shs ($1.50M)

Type	Security	Shares	Price	Value
Sale	Common Stock	20,000	$75.00	$1.50M

Holdings After Transaction: Common Stock — 109,017 shares (Direct)

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 December 16, 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 $75.00 to $75.09. 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.

Key Figures

Shares sold: 20,000 shares Sale price (weighted average): $75.00 per share Price range: $75.00–$75.09 per share +2 more

5 metrics

Shares sold 20,000 shares Open-market sale on May 8, 2026

Sale price (weighted average) $75.00 per share Weighted average sale price for the 20,000 shares

Price range $75.00–$75.09 per share Range of individual trade prices for the sale

Shares owned after sale 109,017 shares Direct holdings of CFO Ryan Corbett following the transaction

Trading plan adoption date December 16, 2025 Date CFO adopted Rule 10b5-1 trading plan

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

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

MP Materials disclosed that CFO Ryan Corbett sold 20,000 shares of common stock. The open-market sale occurred on May 8, 2026 at a weighted average price near $75 per share, under a pre-arranged Rule 10b5-1 trading plan.

How many MP (MP Materials Corp.) shares does the CFO hold after this sale?

After the reported sale, CFO Ryan Corbett holds 109,017 MP Materials common shares directly. This post-transaction holding reflects his remaining ownership stake following the 20,000-share open-market sale disclosed in the Form 4 filing.

At what prices were the MP (MP Materials Corp.) shares sold by the CFO?

The reported 20,000 MP Materials shares were sold at a weighted average price of about $75.00. Individual transactions occurred in a narrow range between $75.00 and $75.09 per share, according to the Form 4 footnote disclosure.

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

Yes. The Form 4 states the CFO’s sales were executed under a Rule 10b5-1 trading plan. That trading plan was adopted on December 16, 2025, indicating the transactions were pre-arranged rather than newly decided at the time of sale.

What type of transaction did the MP (MP Materials Corp.) Form 4 report?

The Form 4 reports an open-market sale of common stock by the CFO. It classifies the transaction under code "S," described as a sale in open market or private transaction, with no associated derivative exercises in this filing.

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

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Accepted by SEC EDGAR 05/08/2026 - 09:21 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^*

Corbett Ryan

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026

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	05/08/2026		S(1)		20,000	D	$75(2)	109,017	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 $75.00 to $75.09. 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	05/08/2026
	** 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)