MTRN · MATERION Corp

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $232.310 to $232.590, 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 this footnote.

Reflects the gift by the reporting person's spouse of 28,832 shares to a family limited partnership, the general partner of which is a limited liability company of which the reporting person is the sole member and manager.

Reflects the gift by the reporting person's spouse of 28,832 shares to a family limited partnership, the general partner of which is a limited liability company of which the reporting person is the sole member and manager.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $234.980 to $235.830, 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 this footnote.

The reporting person gifted 28,832 shares to his spouse.

The reporting person gifted 28,832 shares to his spouse.

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 (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $294.000 to $294.910, 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 footnotes (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $295.000 to $295.450, inclusive.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $292.190 to $292.690 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 this footnote.

The Stock Appreciation Rights vest in three substantially equal annual installments beginning March 1, 2025.

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 (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $287.330 to $287.970, 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 footnotes (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $293.150 to $293.980, 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 footnotes (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $296.000 to $296.560, 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 footnotes (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $290.000 to $290.700, inclusive.

The Stock Appreciation Rights vest in three substantially equal annual installments beginning March 1, 2026.

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 (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $288.030 to $288.415, inclusive.

The Stock Appreciation Rights vest in three substantially equal annual installments beginning February 17, 2022.

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 (2) through (9) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $292.460 to $292.615, inclusive.

Each restricted stock unit represents a right to receive one share of MTRN common stock.

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.

Expiration Date is the same as the Date Exercisable.

Each restricted stock unit represents a right to receive one share of MTRN common stock.

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.

Expiration Date is the same as the Date Exercisable.

Each restricted stock unit represents a right to receive one share of MTRN common stock.

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.

Expiration Date is the same as the Date Exercisable.

Each restricted stock unit (RSU) represents a right to receive one share of MTRN common stock.

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.

Expiration Date is the same as the Date Exercisable.

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 (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $219.310 to $219.920, 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 footnotes (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $218.160 to $218.925, 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 footnotes (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $217.345 to $217.920, 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 footnotes (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $220.150 to $220.480, inclusive.

The Stock Appreciation Rights vested in three substantially equal annual installments beginning on February 19, 2021.

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 (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $207.330 to $208.190, 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 footnotes (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $206.260 to $207.140, 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 footnotes (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $208.400 to $209.210, 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 footnotes (2) through (5) of this Form 4.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.140 to $206.030, inclusive.

Each restricted stock unit represents a right to receive one share of MTRN common stock.

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.

Expiration Date is the same as the Date Exercisable.

Each restricted stock unit represents a right to receive one share of MTRN common stock.

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.

Expiration Date is the same as the Date Exercisable.

The Stock Appreciation Rights vested in three equal annual installments beginning March 1, 2024.