prlb-20260731 0001443669 FALSE 0001443669 2026-07-31 2026-07-31 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 31, 2026 Proto Labs, Inc. (Exact name of registrant as specified in its charter) Minnesota 001-35435 41-1939628 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification Number) 5540 Pioneer Creek Drive Maple Plain , Minnesota 55359 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: (763) 479-3680 Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, Par Value $0.001 Per Share PRLB New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 2.02. 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. Item 9.01. Financial Statements and Exhibits. (d) Exhibits 99.1 Press release of Proto Labs, Inc. dated July 31, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Proto Labs, Inc. Date: July 31, 2026 By: /s/ Daniel Schumacher Daniel Schumacher Chief Financial Officer

Proto Labs, Inc. announced its second quarter 2026 financial results on July 31, 2026 through a press release. This earnings announcement provides stakeholders with insights into the company's operational performance and financial health during the period.

On July 31, 2026, Proto Labs, Inc. announced its second quarter 2026 financial results through a press release, which is attached as Exhibit 99.1. The announcement includes details of the company's performance during the second quarter, although specific financial figures are not detailed in this filing. This kind of filing typically indicates the company's financial health and operational effectiveness, which can impact investor perceptions and stock performance. The press release is important for stakeholders as it provides insights into revenue, profit margins, and forecasts, impacting future business strategies.

Proto Labs, Inc.

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