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): October 3, 2025

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 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On October 3, 2025 (the “Notice Date”), Proto Labs, Inc. (the “Company”) announced that Oleg Ryaboy, Chief Technology Officer, will depart the Company and cease to be an employee, effective November 2, 2025. As of the Notice Date, Mr. Ryaboy is no longer the Company’s Chief Technology Officer or an executive officer of the Company. Marc Kermisch has been appointed to serve as the Company’s new Chief Technology & AI Officer, effective October 13, 2025.

Upon his departure, Mr. Ryaboy will be entitled to receive the severance benefits described in Section 5(A) of the Company's Form of Executive Severance Agreement filed as Exhibit 99.2 to the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on June 6, 2022.

Item 7.01.

Regulation FD Disclosure.

On the Notice Date, the Company issued a press release announcing the leadership transition described in Item 5.02 above. A copy of the press release is attached hereto as Exhibit 99.1.

In accordance with General Instruction B.2 of Form 8-K, the information in this Item 7.01, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in that filing.

Item 9.01.

Financial Statements and Exhibits.

(d)

Exhibits

Exhibit No.	Description
99.1	Press release, dated October 3, 2025
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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: October 3, 2025	/s/ Daniel Schumacher
	Daniel Schumacher
	Chief Financial Officer

Proto Labs Inc 8-K