What SEC filings does NPK International Inc. submit to the SEC?

NPK International Inc. (NPKI) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about NPKI?

A Form 4 for NPKI discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from NPK International Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for NPKI?

The 10-K is NPK International Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all NPKI SEC filings directly on EDGAR?

You can view all historical NPK International Inc. filings on the SEC EDGAR company page for NPKI. Each filing card on this page links directly to the original SEC document.

How often does NPK International Inc. file with the SEC?

NPK International Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling NPKI shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

NPKI SEC Filing News — NPK International Inc.

Latest SEC filings for NPK International Inc. (NPKI) 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: 2026-09-24.

NPK International Inc., a temporary worksite access solutions company, manufactures, sells, and rents recyclable composite matting products in the United States and the United Kingdom. The company engages in the installation and rental of matting systems, and related site construction and services to customers in various markets, including power transmission, oil and natural gas exploration and production, pipeline, renewable energy, petrochemical, construction, and other industries. It also off…

Sector: Industrials Industry: Building Products & Equipment Market Cap: $914.5M CIK: 71829

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for NPKI currently lean bearish. Of the 20 filing records displayed, 5 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 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.

NPKI Filing Activity Snapshot 2026-06-03 — 2026-09-24

Insider Transactions (Form 4)

0 buys vs 5 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$2.42M

LANIGAN MATTHEW (Director, President & CEO) · 2026-06-05

167,375 shares · Form 4

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 10 · 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 10 filings in this group are Form 4s for NPK International Inc.

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 10 insider filings shown, the breakdown is 5 open-market sale, 3 option exercise and 2 compensation award. 5 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×5: 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.
Option exercise ×3: The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Compensation award ×2: 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.

Form 4 Compensation award Tax / Compensation Filing 2026-09-24

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

Barton III Alvin James (EVP Commercial Growth & Ops.) 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	12,850	—	—

Filing: Form 4 (Insider Transaction) Insider: Barton III Alvin James (EVP Commercial Growth & Ops.) Shares: 12,850

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-09-10

NPKI insider Warren Matthew James (Chief Accounting Officer) sold 2,991 shares (~$40.1K)

Warren Matthew James, listed as Chief Accounting Officer at NPK International Inc., reported an open-market sale of 2,991 NPKI 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	2,991	$13.41	$40.1K

Filing: Form 4 (Insider Transaction) Insider: Warren Matthew James (Chief Accounting Officer) Shares: 2,991 Est. Value: $40.1K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-31

NPKI insider ROBESON ROSE M (Director) sold 10,000 shares (~$134.9K)

ROBESON ROSE M, listed as Director at NPK International Inc., reported an open-market sale of 10,000 NPKI 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	10,000	$13.49	$134.9K

Filing: Form 4 (Insider Transaction) Insider: ROBESON ROSE M (Director) Shares: 10,000 Est. Value: $134.9K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-19

NPKI insider Lewis Michael A (Director) sold 2,013 shares (~$28.7K)

Lewis Michael A, listed as Director at NPK International Inc., reported an open-market sale of 2,013 NPKI 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	2,013	$14.26	$28.7K

Filing: Form 4 (Insider Transaction) Insider: Lewis Michael A (Director) Shares: 2,013 Est. Value: $28.7K

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-07-29

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

Pederson Kristen 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	6,614	—	—

Filing: Form 4 (Insider Transaction) Insider: Pederson Kristen J. (Director) Shares: 6,614

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-06-09

NPKI insider Briggs Lori (VP & President, Ind. Solutions) sold 8,325 shares (~$122.8K)

Briggs Lori, listed as VP & President, Ind. Solutions at NPK International Inc., reported an open-market sale of 8,325 NPKI 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	8,325	$14.75	$122.8K

Filing: Form 4 (Insider Transaction) Insider: Briggs Lori (VP & President, Ind. Solutions) Shares: 8,325 Est. Value: $122.8K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-06-05

NPKI insider LANIGAN MATTHEW (Director, President & CEO) sold 167,375 shares (~$2.42M)

LANIGAN MATTHEW, listed as Director, President & CEO at NPK International Inc., reported an open-market sale of 167,375 NPKI 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	167,375	$14.43	$2.42M

Filing: Form 4 (Insider Transaction) Insider: LANIGAN MATTHEW (Director, President & CEO) Shares: 167,375 Est. Value: $2.42M

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-06-03

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

Fruge Mary Celeste (VP, General Counsel) 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
`F`	Tax withholding on vested shares	3,833	$14.31	$54.9K
`F`	Tax withholding on vested shares	5,218	$14.31	$74.7K
`F`	Tax withholding on vested shares	6,797	$14.31	$97.3K
`M`	Option exercise	17,274	—	—
`M`	Option exercise derivative · Restricted Stock Units	17,274	—	—

Filing: Form 4 (Insider Transaction) Insider: Fruge Mary Celeste (VP, General Counsel) Shares: 33,122

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-06-03

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

LANIGAN MATTHEW (Director, President & CEO) 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
`F`	Tax withholding on vested shares	22,232	$14.31	$318.1K
`F`	Tax withholding on vested shares	27,894	$14.31	$399.2K
`F`	Tax withholding on vested shares	39,423	$14.31	$564.1K
`M`	Option exercise	100,188	—	—
`M`	Option exercise derivative · Restricted Stock Units	100,188	—	—

Filing: Form 4 (Insider Transaction) Insider: LANIGAN MATTHEW (Director, President & CEO) Shares: 189,737

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-06-03

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

Piontek Gregg (Senior Vice President and CFO) 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
`F`	Tax withholding on vested shares	8,959	$14.31	$128.2K
`F`	Tax withholding on vested shares	15,889	$14.31	$227.4K
`F`	Tax withholding on vested shares	11,241	$14.31	$160.9K
`M`	Option exercise	40,379	—	—
`M`	Option exercise derivative · Restricted Stock Units	40,379	—	—

Filing: Form 4 (Insider Transaction) Insider: Piontek Gregg (Senior Vice President and CFO) Shares: 76,468

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 4 · 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. NPK International Inc. has 4 such notices 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 Proposed Insider Sale 2026-09-09

NPKI Form 144 filed for proposed insider sale by MATTHEW WARREN (2,991 shares) ~$40.4K

MATTHEW WARREN filed a Form 144 with the SEC indicating intent to sell NPKI (NPK International Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MATTHEW WARREN Shares: 2,991 Est. Value: $40.4K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-08-27

NPKI Form 144 filed for proposed insider sale by ROBESON ROSE M (10,000 shares) ~$134.9K

ROBESON ROSE M filed a Form 144 with the SEC indicating intent to sell NPKI (NPK International Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: ROBESON ROSE M Shares: 10,000 Est. Value: $134.9K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-08-17

NPKI Form 144 filed for proposed insider sale by MICHAEL LEWIS (4,026 shares) ~$57.2K

MICHAEL LEWIS filed a Form 144 with the SEC indicating intent to sell NPKI (NPK International Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MICHAEL LEWIS Shares: 4,026 Est. Value: $57.2K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-06-08

NPKI Form 144 filed for proposed insider sale by LORI BRIGGS (8,325 shares) ~$118.9K

LORI BRIGGS filed a Form 144 with the SEC indicating intent to sell NPKI (NPK International Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: LORI BRIGGS Shares: 8,325 Est. Value: $118.9K

View on SEC EDGAR → Open Filing Document →

Material Events 5 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 5 in this period for NPK International Inc. 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 2026-09-14

NPKI filed 8-K — material company event

NPK International Inc. 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 2026-09-02

NPKI filed 8-K — material company event

NPK International Inc. 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 2026-07-30

NPKI filed 8-K — material company event

NPK International Inc. 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 2026-07-29

NPKI filed 8-K — material company event

NPK International Inc. 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 2026-07-28

NPKI filed 8-K — material company event

NPK International Inc. 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 NPK International Inc.

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 2026-07-30

NPKI filed Quarterly Report (10-Q)

NPK International Inc. 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 NPK International Inc.'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 NPKI. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — NPKI SEC Filings

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NPKI 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.

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