MP insider files Form 144 to sell 20,000 shares

Ryan Corbett filed a Form 144 notifying a proposed sale of 20,000 shares of Common Stock.

Rhea-AI Filing Summary

Ryan Corbett filed a Form 144 notifying a proposed sale of 20,000 shares of Common Stock. The notice lists the shares as RSUs that vested on 11/17/2020 and was filed with a broker, RBC Capital Markets. The Form also shows 46,000 shares sold on 03/17/2026 in the prior three months.

Insights

Insider Transactions Specialist

Routine Form 144 notice for an insider resale; prior three‑month activity is disclosed.

The filing records a proposed sale of 20,000 shares tied to RSUs that vested on 11/17/2020, with brokerage handling by RBC Capital Markets. It also reports 46,000 shares sold on 03/17/2026, including the aggregate figures shown in the excerpt.

These filings are administrative notices under Rule 144; cash‑flow treatment and planned sale timing beyond the notice are not specified in the provided excerpt. Subsequent trading details or confirmation of execution would appear in later transaction reports.

Key Figures

Proposed shares to sell: 20,000 shares Shares sold in past 3 months: 46,000 shares RSU vest date: 11/17/2020 +3 more

6 metrics

Proposed shares to sell 20,000 shares listed on Form 144

Shares sold in past 3 months 46,000 shares sale dated 03/17/2026

RSU vest date 11/17/2020 vesting date for the securities listed

Filing date shown 05/08/2026 date associated with the securities line

Aggregate figure in excerpt 2,760,055.00 appears next to the 46,000‑share sale line

Aggregate figure in excerpt 1,500,022.00 appears next to the 20,000‑share securities line

Key Terms

Form 144, RSU VEST, Issuer

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

RSU VEST financial

"COMMON | 11/17/2020 | RSU VEST"

Issuer regulatory

"RSU VEST | ISSUER"

FAQ

What does Ryan Corbett's Form 144 for MP mean?

It is a notice of a proposed sale: 20,000 shares of MP common stock are listed for sale. The filing signals an intent to sell; actual execution and timing are not provided in the excerpt.

How many MP shares did the filing show sold recently?

The excerpt shows 46,000 shares were sold on 03/17/2026. That sale is reported as activity in the prior three months in the Form 144 filing.

Are the shares in the notice tied to compensation?

Yes. The shares listed for sale are identified as RSUs that vested on 11/17/2020, indicating they originated from a compensation award rather than open‑market purchases.

Which broker is handling the proposed sale in the Form 144?

The filing names RBC Capital Markets LLC at 250 Nicollet Mall, Minneapolis, as the brokerage firm associated with the notice of sale.

Does this Form 144 confirm the sale was completed?

No. Form 144 is a notice of intention to sell under Rule 144. The excerpt lists proposed shares (20,000), but execution details or confirmation are not provided here.

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Accepted by SEC EDGAR 05/08/2026 - 04:02 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	20000	1500022.00	178022198	05/08/2026	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	11/17/2020	RSU VEST	ISSUER			20000	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 CORPORATION	03/17/2026	46000	2760055.00

144: Remarks and Signature

Remarks	SOLD PURSUANT TO A RULE 10B5-1 PLAN ESTABLISHED 12-16-25
Date of Notice	05/08/2026
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 EISCHENS
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)