MP affiliate files Form 144 to sell 46,000 shares

MP affiliate submitted a Form 144 proposing the sale of 46,000 shares of common stock for an aggregate of $2,760,055.00 through RBC Capital Markets LLC.

Rhea-AI Filing Summary

MP affiliate submitted a Form 144 proposing the sale of 46,000 shares of common stock for an aggregate of $2,760,055.00 through RBC Capital Markets LLC. The filing lists 177,230,483 shares outstanding as of 03/17/2026.

The notice shows recently vested RSU lots dated 01/01/2026 (19,272 shares), 01/14/2026 (11,010), 01/13/2026 (9,521), and 01/12/2026 (6,197), which are listed under the securities to be sold.

Insights

Securities Compliance Attorney

Form 144 filed for a proposed affiliate sale of 46,000 shares via broker-dealer.

The filing identifies 46,000 common shares with an aggregate amount of $2,760,055.00, and lists RBC Capital Markets LLC as the broker. The cover-line also records 177,230,483 shares outstanding as of 03/17/2026, which provides a baseline for scale.

The submission includes multiple recently vested RSU lots dated 01/01/2026, 01/12/2026, 01/13/2026, and 01/14/2026. Cash-flow treatment and whether sales are planned under a Rule 10b5-1 plan are not stated in the excerpt; subsequent filings or broker confirmations would clarify execution mechanics.

FAQ

What did MP file on Form 144?

The filing notifies a proposed sale of 46,000 common shares for $2,760,055.00, using RBC Capital Markets LLC as broker. It is a notice of intent to sell by an affiliate, not a confirmation of completed trades.

How many shares outstanding does MP report?

The excerpt lists 177,230,483 shares outstanding as of 03/17/2026. This figure appears on the filing cover and provides a reference for the relative size of the proposed sale.

Are the shares tied to RSU vesting for MP?

Yes. The filing lists recently vested RSU lots: 19,272 (01/01/2026), 11,010 (01/14/2026), 9,521 (01/13/2026), and 6,197 (01/12/2026). These lots are shown among the securities to be sold.

Does the Form 144 show completed sales in the past three months for MP?

The provided excerpt has a header for prior three-month sales but contains no entries under that section. The document does not list any completed sales within that timeframe in the visible content.

Who is the broker handling the proposed MP sale?

The filing names RBC Capital Markets LLC at 250 Nicollet Mall, Minneapolis, MN as the broker-dealer listed for the proposed sale of 46,000 shares on the Form 144 cover line.

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Accepted by SEC EDGAR 03/17/2026 - 04:31 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	46000	2760055.00	177230483	03/17/2026	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	01/01/2026	RSU VEST	ISSUER			19272	01/01/2026	NA
COMMON	01/14/2026	RSU VEST	ISSUER			11010	01/14/2026	NA
COMMON	01/13/2026	RSU VEST	ISSUER			9521	01/13/2026	NA
COMMON	01/12/2026	RSU VEST	ISSUER			6197	01/12/2026	NA

* 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

Nothing to Report

144: Remarks and Signature

Remarks	SOLD PURSUANT TO A RULE 10B5-1 PLAN ESTABLISHED 12/16/2025
Date of Notice	03/17/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/16/2025
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 J. KAPALA
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)