MTRN

SEC source: 0001519910-25-000008 · wk-form4_1762453641.xml · nonDerivative · entry 1

Chemnitz Gregory R. · CIK 0001519910 · VP General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,835

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.

SEC source: 0001628280-25-044455 · wk-form4_1759860339.xml · nonDerivative · entry 1

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 52,328.979

SEC source: 0001628280-25-044456 · wk-form4_1759860345.xml · nonDerivative · entry 1

Prevost Patrick M. · CIK 0001422978 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 15,980.179

SEC source: 0001104657-25-000174 · wk-form4_1757443163.xml · derivative · entry 3

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000174 · wk-form4_1757443163.xml · nonDerivative · entry 1

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 52,133.979

SEC source: 0001104657-25-000176 · wk-form4_1757443176.xml · derivative · entry 3

LIGGETT EMILY M · CIK 0001231898 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000176 · wk-form4_1757443176.xml · nonDerivative · entry 1

LIGGETT EMILY M · CIK 0001231898 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Comp. Plan

Disclosed balance after: 1,267.944

SEC source: 0001104657-25-000175 · wk-form4_1757443169.xml · derivative · entry 1

Chemnitz Gregory R. · CIK 0001519910 · VP General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,961

Underlying: Common Stock · 5 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000173 · wk-form4_1757443156.xml · derivative · entry 1

Toth Robert B · CIK 0001392923 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000171 · wk-form4_1757443143.xml · derivative · entry 3

PHILLIPPY ROBERT J · CIK 0001213190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000171 · wk-form4_1757443143.xml · nonDerivative · entry 1

PHILLIPPY ROBERT J · CIK 0001213190 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Compensation Plan

Disclosed balance after: 12,002.506

SEC source: 0001104657-25-000170 · wk-form4_1757443137.xml · derivative · entry 2

REDDY N MOHAN · CIK 0001209386 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000170 · wk-form4_1757443137.xml · nonDerivative · entry 1

REDDY N MOHAN · CIK 0001209386 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Compensation Plan.

Disclosed balance after: 45,111.525

SEC source: 0001104657-25-000172 · wk-form4_1757443150.xml · derivative · entry 1

Fashinpaur Melissa A · CIK 0002072270 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,212

Underlying: Common Stock · 3 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000169 · wk-form4_1757443130.xml · derivative · entry 2

Prevost Patrick M. · CIK 0001422978 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000169 · wk-form4_1757443130.xml · nonDerivative · entry 1

Prevost Patrick M. · CIK 0001422978 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 15,815.179

SEC source: 0001104657-25-000167 · wk-form4_1757443117.xml · derivative · entry 3

KHILNANI VINOD M · CIK 0001204034 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000167 · wk-form4_1757443117.xml · nonDerivative · entry 1

KHILNANI VINOD M · CIK 0001204034 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Compensation Plan.

Disclosed balance after: 19,970.667

SEC source: 0001104657-25-000168 · wk-form4_1757443124.xml · derivative · entry 1

Chadwick Shelly Marie · CIK 0001688289 · Vice President, Finance & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,310

Underlying: Common Stock · 18 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000166 · wk-form4_1757443110.xml · derivative · entry 1

Vijayvargiya Jugal K. · CIK 0001541300 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,886

Underlying: Common Stock · 22 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000165 · wk-form4_1757443104.xml · derivative · entry 1

Solomon Darlene J. S. · CIK 0001526849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,002

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000159 · wk-form4_1755109697.xml · nonDerivative · entry 1

REDDY N MOHAN · CIK 0001209386 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.3100 to $105.5700, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, 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 (1) of this Form 4.

SEC source: 0001104657-25-000153 · wk-form4_1755015279.xml · derivative · entry 1

Chadwick Shelly Marie · CIK 0001688289 · Vice President, Finance & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,292

Underlying: Common Stock · 4,696 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These restricted stock units vest in a single installment on the third anniversary of the grant date.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000150 · wk-form4_1754489342.xml · nonDerivative · entry 2

Chemnitz Gregory R. · CIK 0001519910 · VP General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,376

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.2300 to $105.5500, inclusive.

SEC source: 0001104657-25-000150 · wk-form4_1754489342.xml · nonDerivative · entry 1

Chemnitz Gregory R. · CIK 0001519910 · VP General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,458

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.2300 to $105.1750, inclusive.

F2 · price: The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, 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 ranges set forth in footnotes (1) and (3) of this Form 4.

SEC source: 0001104657-25-000149 · wk-form4_1754489335.xml · nonDerivative · entry 1

Fashinpaur Melissa A · CIK 0002072270 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.2800 to $105.3700, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, 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 ranges set forth in footnote (1) of this Form 4.

SEC source: 0001104657-25-000146 · wk-form4_1754399869.xml · derivative · entry 3

Fashinpaur Melissa A · CIK 0002072270 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,209

Underlying: Common Stock · 1,214 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.

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: Consists of restricted stock units granted on 03/01/2023, 03/01/2024, and 03/01/2025 that will vest in three substantially equal annual installments on the first three anniversaries of the grant date, and restricted stock units granted on 03/01/2025 that will vest in a single installment on 03/01/2028.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000146 · wk-form4_1754399869.xml · nonDerivative · entry 2

Fashinpaur Melissa A · CIK 0002072270 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,140

SEC source: 0001104657-25-000146 · wk-form4_1754399869.xml · nonDerivative · entry 1

Fashinpaur Melissa A · CIK 0002072270 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,490

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.

SEC source: 0001104657-25-000128 · wk-form4_1751908923.xml · nonDerivative · entry 1

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 52,068.281

SEC source: 0001104657-25-000127 · wk-form4_1751908912.xml · nonDerivative · entry 1

Prevost Patrick M. · CIK 0001422978 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 15,795.249

SEC source: 0001104657-25-000106 · wk-form4_1750170496.xml · derivative · entry 3

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000106 · wk-form4_1750170496.xml · nonDerivative · entry 1

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 51,771.281

SEC source: 0001104657-25-000116 · wk-form4_1750190351.xml · derivative · entry 1

Chadwick Shelly Marie · CIK 0001688289 · Vice President, Finance & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,596

Underlying: Common Stock · 17 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These restricted stock units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000115 · wk-form4_1750170590.xml · derivative · entry 1

Vijayvargiya Jugal K. · CIK 0001541300 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,864

Underlying: Common Stock · 32 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit (RSU) represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the Restricted Stock Units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000114 · wk-form4_1750170580.xml · derivative · entry 1

Toth Robert B · CIK 0001392923 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000113 · wk-form4_1750170570.xml · derivative · entry 3

LIGGETT EMILY M · CIK 0001231898 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000113 · wk-form4_1750170570.xml · nonDerivative · entry 1

LIGGETT EMILY M · CIK 0001231898 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Comp. Plan

Disclosed balance after: 1,266.344

SEC source: 0001104657-25-000112 · wk-form4_1750170560.xml · derivative · entry 3

PHILLIPPY ROBERT J · CIK 0001213190 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000112 · wk-form4_1750170560.xml · nonDerivative · entry 1

PHILLIPPY ROBERT J · CIK 0001213190 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Compensation Plan

Disclosed balance after: 11,987.381

SEC source: 0001104657-25-000111 · wk-form4_1750170550.xml · derivative · entry 1

Fashinpaur Melissa A · CIK 0002072270 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,423

Underlying: Common Stock · 6 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These restricted stock units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000110 · wk-form4_1750170539.xml · derivative · entry 1

Solomon Darlene J. S. · CIK 0001526849 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000109 · wk-form4_1750170528.xml · derivative · entry 3

REDDY N MOHAN · CIK 0001209386 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000109 · wk-form4_1750170528.xml · nonDerivative · entry 1

REDDY N MOHAN · CIK 0001209386 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Compensation Plan.

Disclosed balance after: 45,054.677

SEC source: 0001104657-25-000108 · wk-form4_1750170517.xml · derivative · entry 2

Prevost Patrick M. · CIK 0001422978 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000108 · wk-form4_1750170517.xml · nonDerivative · entry 1

Prevost Patrick M. · CIK 0001422978 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held In Directors Deferred Comp. Plan

Disclosed balance after: 15,544.249

SEC source: 0001104657-25-000107 · wk-form4_1750170507.xml · derivative · entry 3

KHILNANI VINOD M · CIK 0001204034 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,000

Underlying: Common Stock · 4 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate (earlier of May 8, 2026 and the date of the next annual meeting of MTRN's shareholders).

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000107 · wk-form4_1750170507.xml · nonDerivative · entry 1

KHILNANI VINOD M · CIK 0001204034 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Held in Directors Deferred Compensation Plan.

Disclosed balance after: 19,945.501

SEC source: 0001104657-25-000105 · wk-form4_1750170484.xml · derivative · entry 1

Chemnitz Gregory R. · CIK 0001519910 · VP General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,956

Underlying: Common Stock · 7 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F2 · derivative.exercise_date: These units, which were acquired upon the reinvestment of dividend equivalents, will vest at the same time as the restricted stock units to which they relate.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.

SEC source: 0001104657-25-000076 · wk-form4_1746802115.xml · derivative · entry 4

SHULAR CRAIG S · CIK 0001078942 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,996

Underlying: Common Stock · 1,996 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to receive one share of MTRN common stock.

F4 · derivative.exercise_date: The restricted stock units generally vest on the earlier of (1) the first anniversary of the grant date and (2) the next annual meeting of MTRN's shareholders that follows the grant date.

F3 · derivative.expiration_date: Expiration Date is the same as the Date Exercisable.