MP SEC Filing News — MP Materials Corp.

Latest SEC filings for MP Materials Corp. (MP) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-13.

MP Materials Corp., together with its subsidiaries, produces rare earth materials in the Western Hemisphere. It operates in two segments, Materials and Magnetics. The Materials segment owns and operates the Mountain Pass Rare Earth Mine and Processing facility located near Mountain Pass, San Bernardino County, California. The Magnetics segment produces magnetic precursor products, including NdPr metal; and manufactures NdFeB permanent magnets. MP Materials Corp. was founded in 2017 and is headqu…
Sector: Basic Materials Industry: Other Industrial Metals & Mining Market Cap: $6.9B CIK: 1801368
20
Total Filings
1
Bullish Classifications
3
Bearish Classifications
16
Insider Transactions
2
Material Events (8-K)
1
Periodic Reports
Rule-based classifications for MP currently lean bearish. Of the 20 filing records displayed, 3 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 1 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
MP Filing Activity Snapshot 2026-05-29 — 2026-10-13
Insider Transactions (Form 4)
1 buy vs 2 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$26.23M
Litinsky James H. (Director, Chairman and CEO) · 2026-05-29
400,000 shares · Form 4
Form 144 Notices
1
Proposed insider sale filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 16 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 16 filings in this group are Form 4s for MP Materials Corp.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 16 insider filings shown, the breakdown is 8 compensation award, 4 option exercise, 2 open-market sale, 1 open-market purchase and 1 tax withholding. 3 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×8
Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Option exercise ×4
The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Open-market sale ×2
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Open-market purchase ×1
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Tax withholding ×1
Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.
Form 4 Tax withholding Tax / Compensation Filing 2026-10-13

MP insider Form 4 filed for equity award, exercise, or tax withholding

Infuso David Gregory (Chief Accounting Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code Nature Shares Price Value
F Tax withholding on vested shares 338 $42.43 $14.3K
Filing: Form 4 (Insider Transaction) Insider: Infuso David Gregory (Chief Accounting Officer) Shares: 338
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-09-30

MP insider Form 4 filed for equity award, exercise, or tax withholding

DUCKWORTH CONNIE K (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 740 — —
Filing: Form 4 (Insider Transaction) Insider: DUCKWORTH CONNIE K (Director) Shares: 740
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-30

MP insider Form 4 filed for equity award, exercise, or tax withholding

DUCKWORTH CONNIE K (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 624 — —
Filing: Form 4 (Insider Transaction) Insider: DUCKWORTH CONNIE K (Director) Shares: 624
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-06-15

MP insider Form 4 filed for equity award, exercise, or tax withholding

DUCKWORTH CONNIE K (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 3,998 — —
M Option exercise derivative · Restricted Stock Units 3,998 — —
Filing: Form 4 (Insider Transaction) Insider: DUCKWORTH CONNIE K (Director) Shares: 3,998
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-06-15

MP insider Form 4 filed for equity award, exercise, or tax withholding

WEISENBURGER RANDALL J (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 3,998 — —
M Option exercise derivative · Restricted Stock Units 3,998 — —
Filing: Form 4 (Insider Transaction) Insider: WEISENBURGER RANDALL J (Director) Shares: 3,998
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-06-15

MP insider Form 4 filed for equity award, exercise, or tax withholding

Lavan Maryanne (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 3,998 — —
M Option exercise derivative · Restricted Stock Units 3,998 — —
Filing: Form 4 (Insider Transaction) Insider: Lavan Maryanne (Director) Shares: 3,998
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-06-15

MP insider Form 4 filed for equity award, exercise, or tax withholding

MYERS RICHARD B (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 3,998 — —
M Option exercise derivative · Restricted Stock Units 3,998 — —
Filing: Form 4 (Insider Transaction) Insider: MYERS RICHARD B (Director) Shares: 3,998
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-10

MP insider Form 4 filed for equity award, exercise, or tax withholding

WEISENBURGER RANDALL J (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 3,038 — —
Filing: Form 4 (Insider Transaction) Insider: WEISENBURGER RANDALL J (Director)
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-10

MP insider Form 4 filed for equity award, exercise, or tax withholding

MYERS RICHARD B (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 3,038 — —
Filing: Form 4 (Insider Transaction) Insider: MYERS RICHARD B (Director)
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-10

MP insider Form 4 filed for equity award, exercise, or tax withholding

Lavan Maryanne (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 3,038 — —
Filing: Form 4 (Insider Transaction) Insider: Lavan Maryanne (Director)
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-10

MP insider Form 4 filed for equity award, exercise, or tax withholding

McKnight Andrew A. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 3,038 — —
Filing: Form 4 (Insider Transaction) Insider: McKnight Andrew A. (Director)
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-10

MP insider Form 4 filed for equity award, exercise, or tax withholding

DONALD ARNOLD W (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 3,038 — —
Filing: Form 4 (Insider Transaction) Insider: DONALD ARNOLD W (Director)
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-10

MP insider Form 4 filed for equity award, exercise, or tax withholding

DUCKWORTH CONNIE K (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 3,038 — —
Filing: Form 4 (Insider Transaction) Insider: DUCKWORTH CONNIE K (Director)
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-06-10

MP insider Rosenthal Michael Stuart (Chief Operating Officer) bought 10,000 shares (~$543.0K)

Rosenthal Michael Stuart, listed as Chief Operating Officer at MP Materials Corp. / DE, reported an open-market purchase of 10,000 MP shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 10,000 $54.30 $543.0K
Filing: Form 4 (Insider Transaction) Insider: Rosenthal Michael Stuart (Chief Operating Officer) Shares: 10,000 Est. Value: $543.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-06-05

MP insider Litinsky James H. (Director, Chairman and CEO) sold 185,167 shares (~$12.80M)

Litinsky James H., listed as Director, Chairman and CEO at MP Materials Corp. / DE, reported an open-market sale of 185,167 MP shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 11,740 $71.31 $837.2K
S Open-market sale 37,286 $70.23 $2.62M
S Open-market sale 136,141 $68.65 $9.35M
Filing: Form 4 (Insider Transaction) Insider: Litinsky James H. (Director, Chairman and CEO) Shares: 185,167 Est. Value: $12.80M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-29

MP insider Litinsky James H. (Director, Chairman and CEO) sold 400,000 shares (~$26.23M)

Litinsky James H., listed as Director, Chairman and CEO at MP Materials Corp. / DE, reported an open-market sale of 400,000 MP shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 23,113 $66.06 $1.53M
S Open-market sale 92,236 $65.20 $6.01M
S Open-market sale 6,710 $68.18 $457.5K
S Open-market sale 39,445 $67.78 $2.67M
S Open-market sale 49,265 $66.52 $3.28M
S Open-market sale 44,117 $65.65 $2.90M
S Open-market sale 95,114 $64.67 $6.15M
S Open-market sale 1,950 $65.13 $127.0K
S Open-market sale 48,050 $64.56 $3.10M
Filing: Form 4 (Insider Transaction) Insider: Litinsky James H. (Director, Chairman and CEO) Shares: 400,000 Est. Value: $26.23M
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 1 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. MP Materials Corp. has 1 such notice in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Large Proposed Insider Sale 2026-06-03

MP Form 144 filed for proposed insider sale by JAMES HENRY LITINSKY REVOCABLE TRUST (250,000 shares) ~$17.13M

JAMES HENRY LITINSKY REVOCABLE TRUST filed a Form 144 with the SEC indicating intent to sell MP (MP Materials Corp. / DE) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: JAMES HENRY LITINSKY REVOCABLE TRUST Shares: 250,000 Est. Value: $17.13M
View on SEC EDGAR → Open Filing Document →
Material Events 2 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 2 in this period for MP Materials Corp. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-06

MP filed 8-K — material company event

MP Materials Corp. / DE filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-06-10

MP filed 8-K — material company event

MP Materials Corp. / DE filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for MP Materials Corp.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-07

MP filed Quarterly Report (10-Q)

MP Materials Corp. / DE filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify MP Materials Corp.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on MP. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — MP SEC Filings

More Tools for MP

MP Full Stock Analysis MP Live Chart Institutional Ownership Earnings Calendar Options Flow Scanner Semiconductor Demand Zone Tracker Sector Scanner Browse All Stocks

Want deeper MP analysis?

View valuation, growth metrics, the rule-based stock-page score, demand zones, peer comparison, and more — all on the MP stock analysis page.

MP Full Analysis
Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
Data Sources · Methodology · AI Disclosure · Corrections Policy · Disclaimer