Computed from SEC EDGAR filings and closing prices — not copied from any wealth ranking. Dataset . How we calculate this.
Disclosed holdings over time 53 weekly points
What the 1 currently disclosed position would have been worth at each week’s closing price. A rising line means the shares got more valuable, not that this person bought more.
How the line is built
Share counts are as last reported to the SEC and held constant; only prices move.
Insider activity May 15, 2024 – Oct 3, 2025
Matthew Lanigan is recorded in filings to the U.S. SEC via EDGAR as officer and board member, and reported 20 transactions between May 15, 2024 and Oct 3, 2025. The buy and sell totals below count only codes P, S.
Why the other codes are excluded
Share awards (A), shares withheld to pay tax (F), option exercises (M) and gifts (G) also appear in the table, but they are consequences of a pay package or a private transfer, not a decision to buy or sell on the open market. Counting them would turn this into a compensation ranking.
Reported transactions
Price 0.00 is a real reported figure on gifts (G) and share awards (A) — not a missing number. The 25 most recent rows are grouped into 16 lines by date, company and transaction type — open a line to see every lot with its own source link. We hold 26 on file in total. See the full history on EDGAR ↗
How to read this list
Every row is one line of one Form 4 or Form 5, with the filing it came from. Where the record carries no price at all we leave the cell empty instead of guessing one.
The shares and money on a grouped line add up only the lots listed inside that line, and only when every one of them carries the figure. Where a group mixes more than one reporting currency we leave the money blank rather than convert — no source publishes the rate that conversion would need.
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NPK International Inc. NPKI M Option exercise or conversionnot a buy/sell decisionreported at zero 100,188 shares $0 at $0.00 SEC filing ↗
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NPK International Inc. NPKI F Shares withheld for taxes × 3not a buy/sell decision 89,549 shares $1.28M
The 3 lots that make up this line, each with the source behind it. Shares Price Value Filing 39,423 $14.31 $564.1K SEC filing ↗ 27,894 $14.31 $399.2K SEC filing ↗ 22,232 $14.31 $318.1K SEC filing ↗ -
NPK International Inc. NPKI A Grant or awardnot a buy/sell decisionreported at zero 85,771 shares $0 at $0.00 SEC filing ↗
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NPK International Inc. NPKI G Bona fide giftnot a buy/sell decisionreported at zero 770,249 shares $0 at $0.00 SEC filing ↗
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NPK International Inc. NPKI M Option exercise or conversionnot a buy/sell decision 1,000 shares $4.3K at $4.32 SEC filing ↗
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NPK International Inc. NPKI M Option exercise or conversionnot a buy/sell decision 68,896 shares $297.6K at $4.32 SEC filing ↗
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NPK International Inc. NPKI M Option exercise or conversion × 2not a buy/sell decisionreported at zero 208,839 shares $0
The 2 lots that make up this line, each with the source behind it. Shares Price Value Filing 108,651 $0.00reported at zero $0 SEC filing ↗ 100,188 $0.00reported at zero $0 SEC filing ↗ -
NPK International Inc. NPKI F Shares withheld for taxes × 3not a buy/sell decision 104,409 shares $844.7K
The 3 lots that make up this line, each with the source behind it. Shares Price Value Filing 22,232 $8.09 $179.9K SEC filing ↗ 39,423 $8.09 $318.9K SEC filing ↗ 42,754 $8.09 $345.9K SEC filing ↗ -
NPK International Inc. NPKI A Grant or awardnot a buy/sell decisionreported at zero 212,667 shares $0 at $0.00 SEC filing ↗
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NEWPARK RESOURCES INC NR M Option exercise or conversionnot a buy/sell decisionreported at zero 33,333 shares $0 at $0.00 SEC filing ↗
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NEWPARK RESOURCES INC NR F Shares withheld for taxesnot a buy/sell decision 13,116 shares $107.9K at $8.23 SEC filing ↗
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NEWPARK RESOURCES INC NR M Option exercise or conversion × 3not a buy/sell decisionreported at zero 245,930 shares $0
The 3 lots that make up this line, each with the source behind it. Shares Price Value Filing 37,090 $0.00reported at zero $0 SEC filing ↗ 108,651 $0.00reported at zero $0 SEC filing ↗ 100,189 $0.00reported at zero $0 SEC filing ↗ -
NEWPARK RESOURCES INC NR F Shares withheld for taxes × 3not a buy/sell decision 96,772 shares $820.6K
The 3 lots that make up this line, each with the source behind it. Shares Price Value Filing 42,754 $8.48 $362.6K SEC filing ↗ 39,424 $8.48 $334.3K SEC filing ↗ 14,594 $8.48 $123.8K SEC filing ↗
Disclosed holdings
Shares is the amount on the form; value is that amount times the closing price shown. Rows with no closing price are left blank, so they may add up to less than the headline figure.
What is not counted here
Each row is one filing you can open. Private companies, real estate, bonds and crypto are not in SEC insider filings and are therefore not counted here.
| Issuer | Ticker | Security | Shares | Close | Value | Form | Reported | Filing |
|---|---|---|---|---|---|---|---|---|
| NPK International Inc. | NPKI | Common Stock (indirect) | 1,095,913 | $13.22 | $14.5M | 4 | EDGAR ↗ |
Other insiders at the same companies
People who also file with the SEC at a company where Matthew Lanigan reports shares.
Sharing a filing does not mean they work together day to day — it means both names appear on the same issuer’s insider record.
- Claudia Michel Meer Board Member · NPK International Inc.
- David A. Paterson President · NPK International Inc.
- Donald Win Young Board Member · NPK International Inc.
- Douglas L. White Chief Accounting Officer · NPK International Inc.
- Gregg Piontek CFO · NPK International Inc.
- John C. Minge Board Member · NPK International Inc.
- Joseph A. Cutillo CEO · NPK International Inc.
- Lori Briggs President · NPK International Inc.
- Mary Celeste Fruge General Counsel · NPK International Inc.
- Michael A Lewis Board Member · NPK International Inc.
- Roderick A. Larson CEO · NPK International Inc.
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Rose M. Robeson
Board Member · NPK International Inc.
Sources
The filings linked in the tables above are the sources for every figure on this page.
Think a number here is wrong? Open the linked filing and compare — how to report it.
Profile record last refreshed Sep 8, 2026.