MP Materials shareholder plans sale of 38,146 common shares

MP Materials Corp. has a shareholder filing a Form 144 notice to sell up to 38,146 shares of common stock through RBC Capital Markets LLC, with an aggregate market value of $2,288,760.

Rhea-AI Filing Summary

MP Materials Corp. has a shareholder filing a Form 144 notice to sell up to 38,146 shares of common stock through RBC Capital Markets LLC, with an aggregate market value of $2,288,760. The notice lists 177,230,483 shares of this class outstanding and identifies the New York Stock Exchange as the planned trading venue, with an approximate sale date of December 9, 2025.

The securities to be sold were acquired via restricted stock or RSU vesting from the issuer on November 17, 2024 (15,195 shares) and November 17, 2020 (22,951 shares), with no separate cash payment. Over the prior three months, the same seller, named Ryan Corbett, sold 20,000 securities of MP Materials Corp. on November 17, 2025 for gross proceeds of $1,154,480. The signer represents that they are not aware of undisclosed material adverse information about the issuer.

FAQ

What does the MP (MP Materials) Form 144 filing disclose?

The Form 144 shows a shareholder intends to sell up to 38,146 shares of MP Materials common stock through RBC Capital Markets LLC on or about December 9, 2025, with an aggregate market value of $2,288,760.

How many MP Materials shares are outstanding in this Form 144?

The notice lists 177,230,483 shares of the relevant class of MP Materials Corp. securities as outstanding at the time referenced in the filing.

How were the MP Materials shares in this Form 144 acquired?

The securities to be sold were acquired via RS/RSU vest transactions from the issuer on November 17, 2024 (15,195 shares) and November 17, 2020 (22,951 shares), with the nature of payment noted as N/A.

What recent MP Materials share sales by this holder are reported?

Over the past three months, the holder named Ryan Corbett sold 20,000 MP Materials securities on November 17, 2025, generating $1,154,480 in gross proceeds.

Which broker and exchange are involved in the MP Form 144 sale?

The planned sale is through RBC Capital Markets LLC, located in Minneapolis, with the securities to be sold on the New York Stock Exchange (NYSE).

What representation does the seller make in the MP Materials Form 144?

By signing the notice, the seller represents that they do not know any material adverse information about MP Materials Corp.'s current or prospective operations that has not been publicly disclosed.

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Accepted by SEC EDGAR 12/09/2025 - 04:14 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001831686
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MP Materials Corp. / DE
SEC File Number	001-39277
Address of Issuer	1700 S. PAVILION CENTER DR. SUITE 800 LAS VEGAS NEVADA 89135
Phone	(702) 844-6111
Name of Person for Whose Account the Securities are To Be Sold	Corbett Ryan
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
COMMON	RBC CAPITAL MARKETS LLC 250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401	38146	2288760.00	177230483	12/09/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
COMMON	11/17/2024	RS/RSU VEST	ISSUER			15195	11/17/2024	N/A
COMMON	11/17/2020	RS/RSU VEST	ISSUER			22951	11/17/2020	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
RYAN CORBETT C/O RBC CAPITAL MARKETS LLC 250 NICOLLET MALL MINNEAPOLIS MN 55401	MP MATERIALS CORP	11/17/2025	20000	1154480.00

144: Remarks and Signature

Remarks
Date of Notice	12/09/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	POA / JEFFREY EISCHENS
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)