NPKI

SEC source: 0002155766-26-000006 · edgardoc.xml · nonDerivative · entry 1

Barton III Alvin James · CIK 0002155766 · EVP Commercial Growth & Ops.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,850

F1 · shares: Grant of restricted stock units that vests one-half on the second anniversary of the date of grant and remaining one-half on the fourth anniversary of the date of grant and settles in shares.

SEC source: 0002152870-26-000010 · edgardoc.xml · nonDerivative · entry 1

Warren Matthew James · CIK 0002152870 · Chief Accounting Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 51,439

F1 · shares: The reported sale of 2,991 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 17, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $13.33 to $13.51, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001251678-26-000005 · edgardoc.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 215,147

F1 · shares: The reported sale of 10,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 27, 2026.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $13.11 to $13.72, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001423238-26-000010 · edgardoc.xml · nonDerivative · entry 1

Lewis Michael A · CIK 0001423238 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,865

F1 · shares: The reported sale of 2,013 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.15 to $14.40, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0002096728-26-000008 · edgardoc.xml · nonDerivative · entry 1

Pederson Kristen J. · CIK 0002096728 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,614

F1 · shares: Represents pro-rated portion of non-employee director's annual equity retainer. The shares will vest on the earlier of the first anniversary of the date of grant or the day priopr to the next annual stockholders meeting.

SEC source: 0001880836-26-000006 · edgardoc.xml · nonDerivative · entry 1

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 247,165

F1 · shares: The reported sale of 8,325 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 15, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.40 to $15.03, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001672978-26-000006 · edgardoc.xml · nonDerivative · entry 1

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 254,699

F1 · shares: The reported sale of 167,375 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 4, 2026.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.29 to $14.56, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001880836-26-000004 · edgardoc.xml · nonDerivative · entry 5

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 255,490

F3 · shares: The reported sale of 10,446 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 15, 2025.

F4 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.33 to $14.74, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001975485-26-000011 · edgardoc.xml · derivative · entry 5

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 17,274 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The restricted stock units vest and convert into shares on a one-for-one basis.

F3 · derivative.exercise_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

F3 · derivative.expiration_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001975485-26-000011 · edgardoc.xml · nonDerivative · entry 4

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 284,641

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: The restricted stock units vest and convert into shares on a one-for-one basis.

SEC source: 0001975485-26-000011 · edgardoc.xml · nonDerivative · entry 3

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 267,367

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001975485-26-000011 · edgardoc.xml · nonDerivative · entry 2

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 274,164

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001975485-26-000011 · edgardoc.xml · nonDerivative · entry 1

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 279,382

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001672978-26-000004 · edgardoc.xml · derivative · entry 6

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 100,188 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The restricted stock units vest and convert into shares on a one-for-one basis.

F3 · derivative.exercise_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

F3 · derivative.expiration_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001672978-26-000004 · edgardoc.xml · nonDerivative · entry 4

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 422,074

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: The restricted stock units vest and convert into shares on a one-for-one basis.

SEC source: 0001672978-26-000004 · edgardoc.xml · nonDerivative · entry 3

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 321,886

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001672978-26-000004 · edgardoc.xml · nonDerivative · entry 2

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 361,309

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001672978-26-000004 · edgardoc.xml · nonDerivative · entry 1

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 389,203

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001418328-26-000012 · edgardoc.xml · derivative · entry 6

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 40,379 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The restricted stock units vest and convert into shares on a one-for-one basis.

F4 · derivative.exercise_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

F4 · derivative.expiration_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001418328-26-000012 · edgardoc.xml · nonDerivative · entry 4

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 858,182

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: The restricted stock units vest and convert into shares on a one-for-one basis.

SEC source: 0001418328-26-000012 · edgardoc.xml · nonDerivative · entry 3

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 817,803

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001418328-26-000012 · edgardoc.xml · nonDerivative · entry 2

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 829,044

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001418328-26-000012 · edgardoc.xml · nonDerivative · entry 1

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 844,933

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001880836-26-000004 · edgardoc.xml · derivative · entry 6

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 24,340 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The restricted stock units vest and convert into shares on a one-for-one basis.

F5 · derivative.exercise_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

F5 · derivative.expiration_date: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001880836-26-000004 · edgardoc.xml · nonDerivative · entry 4

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 265,936

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: The restricted stock units vest and convert into shares on a one-for-one basis.

SEC source: 0001880836-26-000004 · edgardoc.xml · nonDerivative · entry 3

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 241,596

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001880836-26-000004 · edgardoc.xml · nonDerivative · entry 2

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 248,373

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001880836-26-000004 · edgardoc.xml · nonDerivative · entry 1

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 257,950

F1 · shares: Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

SEC source: 0001251678-26-000003 · edgardoc.xml · nonDerivative · entry 1

ROBESON ROSE M · CIK 0001251678 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 225,147

F1 · shares: The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

SEC source: 0001844492-26-000002 · edgardoc.xml · nonDerivative · entry 1

Meer Claudia Michel · CIK 0001844492 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 126,693

F1 · shares: The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

SEC source: 0001724571-26-000002 · edgardoc.xml · nonDerivative · entry 1

MINGE JOHN C · CIK 0001724571 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 253,942

F1 · shares: The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

SEC source: 0001423238-26-000006 · edgardoc.xml · nonDerivative · entry 1

Lewis Michael A · CIK 0001423238 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 137,878

F1 · shares: The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

SEC source: 0001550150-26-000010 · edgardoc.xml · nonDerivative · entry 1

LARSON RODERICK A. · CIK 0001550150 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,655

F1 · shares: The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

SEC source: 0001671928-26-000003 · edgardoc.xml · nonDerivative · entry 1

CUTILLO JOSEPH A · CIK 0001671928 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,155

F1 · shares: The shares will vest on the earlier of the first anniversary of the date of grant or the day prior to the next annual stockholders meeting.

SEC source: 0001418328-26-000010 · edgardoc.xml · nonDerivative · entry 1

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 853,892

F1 · shares: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001672978-26-000002 · edgardoc.xml · nonDerivative · entry 1

LANIGAN MATTHEW · CIK 0001672978 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 411,435

F1 · shares: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001975485-26-000009 · edgardoc.xml · nonDerivative · entry 1

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 283,215

F1 · shares: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001880836-26-000002 · edgardoc.xml · nonDerivative · entry 1

Briggs Lori · CIK 0001880836 · VP & President, Ind. Solutions

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 263,351

F1 · shares: Grant of restricted stock units that vest in one-third increments on June 1 of each subsequent year after grant and settle in shares.

SEC source: 0001423238-26-000004 · edgardoc.xml · nonDerivative · entry 1

Lewis Michael A · CIK 0001423238 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 129,320

F1 · shares: The reported sale of 2,013 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 7, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $15.21 to $15.54, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001418328-26-000008 · edgardoc.xml · nonDerivative · entry 1

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 819,326

F1 · shares: The reported sale of 15,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $15.00 to $15.10, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001418328-26-000006 · wk-form4_1775235604.xml · nonDerivative · entry 1

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 834,326

F1 · shares: The reported sale of 35,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $14.33 to $14.68, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0000071829-26-000011 · wk-form4_1774556949.xml · nonDerivative · entry 1

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 869,326

F1 · shares: The reported sale of 15,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2025.

F2 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $15.00 to $15.12, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001975485-26-000007 · edgardoc.xml · derivative · entry 3

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,000 shares

Expires 2026-05-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The reported exercise of 1,000 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

SEC source: 0001975485-26-000007 · edgardoc.xml · nonDerivative · entry 2

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 265,213

F1 · shares: The reported exercise of 1,000 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

F2 · price: These options were sold on the open market at price stated. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of options sold.

SEC source: 0001975485-26-000007 · edgardoc.xml · nonDerivative · entry 1

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 266,213

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The reported exercise of 1,000 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

SEC source: 0001975485-26-000005 · edgardoc.xml · derivative · entry 3

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,000

Underlying: Common Stock · 11,193 shares

Expires 2026-05-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The reported exercise of 11,193 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

SEC source: 0001975485-26-000005 · edgardoc.xml · nonDerivative · entry 2

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 265,213

F1 · shares: The reported exercise of 11,193 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

F2 · price: The price reported is the weighted average price. These options were sold in multiple transactions in the open market at prices ranging from $13.24 to $13.48, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of options sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001975485-26-000005 · edgardoc.xml · nonDerivative · entry 1

Fruge Mary Celeste · CIK 0001975485 · VP, General Counsel

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 276,406

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The reported exercise of 11,193 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2025.

SEC source: 0001418328-26-000002 · edgardoc.xml · derivative · entry 5

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 73,590 shares

Expires 2026-05-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The reported exercise of 73,590 options and subsequent sale of the shares acquired upon exercise occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2025.

SEC source: 0001418328-26-000002 · edgardoc.xml · nonDerivative · entry 3

Piontek Gregg · CIK 0001418328 · Senior Vice President and CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 884,326

F3 · shares: The reported sale of 35,000 shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2025.

F4 · price: The price reported is the weighted average price. These shares were sold in multiple transactions in the open market at prices ranging from $13.68 to $14.31, inclusive. The reporting person undertakes to provide to NPK International Inc., any security holder of NPK International Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.