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Advanced Energy Industries, Inc._February 10, 2026 0000927003false00009270032026-02-102026-02-10 ​ ​

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): February 10, 2026

Advanced Energy Industries, Inc. (Exact name of registrant as specified in its charter)

​ Delaware ​ ​ ​ 000-26966 ​ ​ ​ 84-0846841

(State or other jurisdiction of incorporation) ​ (Commission File Number) ​ (IRS Employer Identification No.)

​ ​

​

​

1595 Wynkoop Street, Suite 800, Denver, Colorado ​ ​ ​ 80202

(Address of principal executive offices) ​ (Zip Code)

​ (970) 407-6626 (Registrant’s telephone number, including area code) ​ 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 (see General Instruction A.2. below): ​ ☐ 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, $0.001 par value ​

AEIS

​ Nasdaq Global Select Market

​ Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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. The information in this Form 8-K is furnished under “Item 2.02 Results of Operations and Financial Condition” and Exhibit 99.1 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Act of 1934, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing. On February 10, 2026, Advanced Energy Industries, Inc. issued a press release announcing its financial results for the quarter ended December 31, 2025. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1. Item 9.01 Financial Statements and Exhibits. (d) Exhibits ​

Exhibit Number ​ ​ ​ Description

​ ​ ​

99.1 ​ Advanced Energy press release dated February 10, 2026 reporting financial results

​ ​ ​

104 ​ The cover page from Advanced Energy Industries, Inc. Current Report on Form 8-K, formatted in Inline XBRL ​

​ ​ ​

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. ​ ​

​

​ ​

​ ​

​ /s/ Paul Oldham

Date: February 10, 2026 Paul Oldham

​ Chief Financial Officer & Executive Vice President

​ ​

​ ​ ​ ​

Advanced Energy Industries, Inc._November 4, 2025 0000927003false00009270032025-11-042025-11-04 ​ ​

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): November 4, 2025

Advanced Energy Industries, Inc. (Exact name of registrant as specified in its charter)

​ Delaware

000-26966

84-0846841

(State or other jurisdiction of incorporation) ​ (Commission File Number) ​ (IRS Employer Identification No.)

​ ​

​

​

1595 Wynkoop Street, Suite 800, Denver, Colorado

80202

(Address of principal executive offices) ​ (Zip Code)

​ (970) 407-6626 (Registrant’s telephone number, including area code) ​ 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 (see General Instruction A.2. below): ​ ☐ 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, $0.001 par value ​

AEIS

​ Nasdaq Global Select Market

​ Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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. The information in this Form 8-K is furnished under “Item 2.02 Results of Operations and Financial Condition” and Exhibit 99.1 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Act of 1934, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing. On November 4, 2025, Advanced Energy Industries, Inc. issued a press release announcing its financial results for the quarter ended September 30, 2025. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1. Item 9.01 Financial Statements and Exhibits. (d) Exhibits ​

Exhibit Number

Description

​ ​ ​

99.1 ​ Advanced Energy press release dated November 4, 2025 reporting financial results

​ ​ ​

104 ​ The cover page from Advanced Energy Industries, Inc. Current Report on Form 8-K, formatted in Inline XBRL ​

​ ​ ​

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. ​ ​

​

​ ​

​ ​

​ /s/ Paul Oldham

Date: November 4, 2025 Paul Oldham

​ Chief Financial Officer & Executive Vice President

​ ​

​ ​ ​ ​