8-K

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): January 26, 2026

Alamo Group Inc.

(Exact name of registrant as specified in its charter)

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))

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 2.01 Completion of Acquisition or Disposition of Assets.

On December 10, 2025, Alamo Group Inc. (the “Company”), through Alamo Group (USA) Inc., a wholly-owned subsidiary of the Company, entered into a definitive Membership Interest Purchase Agreement ("Purchase Agreement") to acquire 100% of the equity interests in Petersen Industries, Inc. (“Petersen”). The total consideration for the purchase is approximately $166,500,000, subject to certain post-closing adjustments.

On January 26, 2026, the Company completed the acquisition of Petersen. Total consideration paid was approximately $166,500,000 on a cash free, debt free basis, subject to certain closing adjustments.

The Company’s press release announcing the completion of the Petersen acquisition is attached as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01    Financial Statements and Exhibits

Exhibit 99.1 – Press Release datedJanuary 26, 2026

Exhibit 104 – Cover Page Interactive Data File - Inline XBRL for the cover page of this Current Report on Form 8-K

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.

Document

ALAMO GROUP INC. COMPLETES ACQUISITION OF PETERSEN INDUSTRIES

SEGUIN, Texas, January 26, 2026 -- Alamo Group Inc. (NYSE: ALG), a leading global manufacturer of high-quality industrial and vegetation management equipment, today announced that it has completed the acquisition of Petersen Industries, a manufacturer of specialized truck-mounted grapple loader equipment, serving both municipal and industrial customers. The signing of the acquisition purchase agreement was previously announced on December 10, 2025.

“We are thrilled to welcome the men and women of Petersen Industries to our team,” said Robert Hureau, Alamo Group’s President and Chief Executive Officer. “We are confident that together we will further strengthen Petersen’s market-leading position with a continued focus on customers and product innovation, and with an emphasis on further developing Petersen’s sales coverage by leveraging Alamo’s excellent channel network. I am very optimistic about the momentum our combined strengths, talents and resources will generate in the future, as we continue our focus on long-term value creation for all of our stakeholders.”

About Alamo Group

Alamo Group is a leading global manufacturer of high-quality industrial and vegetation management equipment essential for public and private infrastructure maintenance and responsible land management practices. Our products include vacuum trucks, hydro-excavator machines, street sweepers, truck-mounted grapple machines, snow and ice removal equipment, tractor-mounted mowing attachments, recycling and tree care equipment, and other industrial

and vegetation maintenance equipment, and related after-market parts and services. The Company operates 27 plants in North America, Europe, Australia, and Brazil as of September 30, 2025.

Forward Looking Statements

This release contains forward-looking statements that are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements involve known and unknown risks and uncertainties, which may cause the Company’s actual results in future periods to differ materially from forecasted results. Among those factors which could cause actual results to differ materially are the following: adverse economic conditions which could lead to a reduction in overall market demand, supply chain disruptions, labor constraints, unanticipated acquisition results, increasing costs due to inflation, disease outbreaks, geopolitical risks, including effects of the war in the Ukraine and the Middle East, competition, weather, seasonality, currency-related issues, and other risk factors listed from time to time in the Company’s SEC reports. The Company does not undertake any obligation to update the information contained herein, which speaks only as of this date.