| Results of Operations and Financial Condition. On October 29, 2026, Proto Labs, Inc. issued a press release announcing its third quarter 2026 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On July 31, 2026, Proto Labs, Inc. issued a press release announcing its second quarter 2026 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

The filing is about an amendment to the Long-Term Incentive Plan, not a management change.

Chief Operations Officer — Michael R. Kenison: Michael R. Kenison intends to retire and Bernardo Parlange was appointed as the Chief Commercial Officer.

Results of Operations and Financial Condition. On May 1, 2026, Proto Labs, Inc. issued a press release announcing its first quarter 2026 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

The information contained in Items 2.02 and 9.01 of this report is being “furnished” and not “filed” with the SEC for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under such section. Furthermore, such information shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, unless specifically identified as being incorporated therein by re…

Results of Operations and Financial Condition. On February 6, 2026, Proto Labs, Inc. issued a press release announcing its fourth quarter and full year 2025 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On October 31, 2025, Proto Labs, Inc. issued a press release announcing its third quarter 2025 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Chief Technology Officer — Oleg Ryaboy: Mr. Ryaboy is departing the company and ceasing to be an employee.

Results of Operations and Financial Condition. On July 31, 2025, Proto Labs, Inc. issued a press release announcing its second quarter 2025 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

CEO — Robert Bodor: The CEO ceased to be President and CEO effective May 20, 2025, representing a sudden loss of the top executive without an immediate named successor in this filing.

CEO — Suresh Krishna: The filing announces the appointment of an external CEO, Suresh Krishna, to succeed Robert Bodor, representing a significant leadership change but not a loss of an executive without replacement.

Results of Operations and Financial Condition. On May 2, 2025, Proto Labs, Inc. issued a press release announcing its first quarter 2025 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On February 7, 2025, Proto Labs, Inc. (the "Company") issued a press release announcing its fourth quarter and full year 2024 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Regulation FD Disclosure. On February 7, 2025, the Company announced that its board of directors authorized the repurchase of shares of the Company's common stock from time to time on the open market or in privately negotiated purchases, at an aggregate purchase price of $100 million (the "Stock Repurchase Program"). The actual timing, manner, number, and value of shares repurchased under the Stock Repurchase Program will be determined by management at its discretion and will depend on severa…

Results of Operations and Financial Condition. On November 1, 2024, Proto Labs, Inc. issued a press release announcing its third quarter 2024 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Material Impairments. To the extent required, the information contained in

Costs Associated with Exit or Disposal Activities. On October 21, 2024, the Board of Directors of Proto Labs, Inc. (the “Company”) approved a plan related to the Company's manufacturing facilities in Germany. The plan includes the closure of the Company's prototype injection molding manufacturing facility in Eschenlohe, Germany, and the discontinuation of Direct Metal Laser Sintering 3D printing services through its 3D printing facility in Putzbrunn, Germany. Affected employees in Germany wil…

Vice President — Bjoern Klaas: The filing details the formal settlement and separation of a former Vice President and General Manager, confirming his exit from the company.

Results of Operations and Financial Condition. On August 2, 2024, Proto Labs, Inc. issued a press release announcing its second quarter 2024 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Vice President — Bjoern Klaas: The Vice President and General Manager of the EMEA region exited his position, constituting a genuine departure of a senior executive, though the ongoing transition discussions suggest an orderly process.

The filing describes the approval of an amended long-term incentive plan, which is a compensatory arrangement rather than a change in management personnel.

Results of Operations and Financial Condition. On May 3, 2024, Proto Labs, Inc. issued a press release announcing its first quarter 2024 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On February 9, 2024, Proto Labs, Inc. issued a press release announcing its fourth quarter and full year 2023 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On November 3, 2023, Proto Labs, Inc. issued a press release announcing its third quarter 2023 financial results. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated herein by reference.