Results of Operations and Financial Condition. On August 5, 2026, Materion Corporation issued a press release announcing its results for the second quarter of 2026. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition. On April 29, 2026, Materion Corporation issued a press release announcing its results for the first quarter of 2026. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition. On February 12, 2026, Materion Corporation issued a press release announcing its results for the fourth quarter and full year 2025. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition Materion Corporation today announced a business update in advance of its fourth quarter earnings release, scheduled for February 12, 2026. In the fourth quarter, a large precision clad strip customer identified a quality issue with Materion-produced material used in its manufacturing process. At the customer’s request, we temporarily idled the production facilities responsible for this material while conducting a thorough investigation to determin…

Director — N. Mohan Reddy: The filing discloses the planned retirement of a long-serving director at the next annual meeting and the appointment of a new director to fill the vacancy, which is a routine board succession event.

Results of Operations and Financial Condition. On October 29, 2025, Materion Corporation issued a press release announcing its results for the third quarter of 2025. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Entry into a Material Definitive Agreement. On August 20, 2025, Materion Corporation (the “Company”) and certain of its subsidiaries entered into an amendment (the “Amendment”) to their Amended and Restated Precious Metals Consignment Agreement governing their U.S. consignment facility (the “Consignment Facility”) with Bank of Montreal (“BMO”). Among other things, the Amendment extends the maturity date of the Consignment Facility from August 31, 2025 to August 31, 2028. The Consignment Facil…

CFO — Shelly Chadwick: The filing discloses a special equity grant to the CFO, which is a compensatory arrangement rather than a change in management status or departure.

Results of Operations and Financial Condition. On July 30, 2025, Materion Corporation issued a press release announcing its results for the second quarter of 2025. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Entry into a Material Definitive Agreement. On June 26, 2025, Materion Corporation, an Ohio corporation ("Materion"), entered into a Fifth Amended and Restated Credit Agreement (the "Credit Agreement"), with JPMorgan Chase Bank, N.A., as administrative agent, Wells Fargo Bank National Association and Bank of America, N.A., as co-syndication agents, KeyBank National Association and PNC Bank, National Association, as co-documentation agents, and JPMorgan Chase Bank, N.A., Wells Fargo Securities…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information included in

Chief Accounting Officer — Melissa A. Fashinpaur: An internal employee was promoted to the newly created or filled position of Chief Accounting Officer, assuming duties previously held by the CFO, which is a standard succession or role expansion event rather than a departure.

The filing describes the approval of a new equity compensation plan, which is a routine corporate governance matter rather than a change in management personnel.

Results of Operations and Financial Condition. On May 1, 2025, Materion Corporation issued a press release announcing its results for the first quarter of 2025. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition. On February 19, 2025, Materion Corporation issued a press release announcing its results for the fourth quarter and full year 2024. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition. On October 30, 2024, Materion Corporation issued a press release announcing its results for the third quarter of 2024. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Regulation FD Disclosure. Materion Corporation (“Materion” or the “Company”) is revising its 2024 full year adjusted earnings per share guidance to the range of $5.20 to $5.40, as a result of lower than expected incoming order rates for the second half of 2024. The Company previously anticipated that semiconductor and industrial orders would continue the improved trajectory seen through the second quarter of 2024, but incoming order rates have developed slower than expected. The impact from a…

Results of Operations and Financial Condition. On August 5, 2024, Materion Corporation issued a press release announcing its results for the second quarter of 2024. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition. On May 1, 2024, Materion Corporation issued a press release announcing its results for the first quarter of 2024. The press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Regulation FD Disclosure. Materion Corporation (the “Company”) is providing an update to its expected value-added sales for the first quarter ending March 29, 2024. Materion estimates that value-added sales for the first quarter will be in the range of $255 to $265 million, or roughly 10 percent below expectations contemplated in the published 2024 earnings guidance. The decrease is primarily due to lower shipments resulting from temporary operational challenges and, to a lesser extent, slowe…