STOCK TITAN

Rosenthal Family Trust linked to MP (MP) COO buys 10,000 shares

(Very High)
(Positive)
Form Type
4

Rhea-AI Filing Summary

MP Materials Corp. Chief Operating Officer Michael Stuart Rosenthal reported an insider purchase of Common Stock through the Rosenthal Family Trust. The trust bought 10,000 shares in an open-market transaction at $54.30 per share, and held 136,622 shares indirectly afterward. A separate filing line shows Rosenthal directly owning 1,333,673 shares of Common Stock following the reported date.

Positive

  • None.

Negative

  • None.
Insider Rosenthal Michael Stuart
Role Chief Operating Officer
Bought 10,000 shs ($543K)
Type Security Shares Price Value
Purchase Common Stock 10,000 $54.30 $543K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 136,622 shares (Indirect, By Rosenthal Family Trust); Common Stock — 1,333,673 shares (Direct)
Shares purchased 10,000 shares Open-market purchase by Rosenthal Family Trust
Purchase price $54.30 per share Open-market purchase on reported date
Indirect holdings after 136,622 shares Rosenthal Family Trust indirect ownership after purchase
Direct holdings after 1,333,673 shares Michael Rosenthal direct ownership following reported date
open-market purchase financial
"The trust bought 10,000 shares in an open-market transaction at $54.30 per share"
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
Common Stock financial
"purchased 10,000 shares of MP Materials Common Stock"
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.
indirect ownership financial
"held 136,622 shares of MP Materials Common Stock indirectly"
Form 4 regulatory
"The Form 4 reports that the Rosenthal Family Trust"
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.
Rosenthal Family Trust financial
"The Rosenthal Family Trust, associated with MP’s COO Michael Rosenthal"

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FAQ

What insider transaction did MP COO Michael Rosenthal report on Form 4 for MP?

The Form 4 reports that the Rosenthal Family Trust, associated with MP’s COO Michael Rosenthal, purchased 10,000 shares of MP Materials Common Stock. The transaction was an open-market purchase at a price of $54.30 per share, increasing the trust’s indirect holdings.

How many MP shares does the Rosenthal Family Trust hold after this Form 4 transaction?

After the reported transaction, the Rosenthal Family Trust held 136,622 shares of MP Materials Common Stock indirectly. This figure reflects holdings attributed to the trust, not Michael Rosenthal’s separate direct ownership position disclosed in another line of the filing.

What is Michael Rosenthal’s direct ownership in MP after the reported Form 4 date?

The Form 4 shows that Michael Rosenthal directly owned 1,333,673 shares of MP Materials Common Stock following the reported date. This direct holding is separate from the 136,622 shares owned indirectly through the Rosenthal Family Trust.

Was the MP insider transaction an open-market purchase or another type of trade?

The MP insider transaction was an open-market purchase. The Rosenthal Family Trust bought 10,000 shares of MP Materials Common Stock at $54.30 per share, coded as a “P” transaction, which signifies a purchase in the open market or a private transaction.

Is the MP insider transaction held directly by Michael Rosenthal or through an entity?

The 10,000-share purchase was held indirectly through the Rosenthal Family Trust, as indicated by the indirect ownership code and the description “By Rosenthal Family Trust.” Michael Rosenthal’s separate direct ownership is disclosed in a different entry within the Form 4.
SEC Form 4
FORM 4UNITED 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*
Rosenthal Michael Stuart

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Operating Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/09/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/09/2026P10,000A$54.3136,622IBy Rosenthal Family Trust
Common Stock1,333,673D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
/s/ Elliot D. Hoops, Attorney-In-Fact for Michael Rosenthal06/10/2026
** Signature of Reporting PersonDate
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)