Sec Form 4 Filing - Vonne Elizabeth Karpinski @ ADVANCED ENERGY INDUSTRIES INC - 2024-03-01

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Vonne Elizabeth Karpinski 2. Issuer Name and Ticker or Trading Symbol ADVANCED ENERGY INDUSTRIES INC [ AEIS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, General Counsel (Last) (First) (Middle) 1595 WYNKOOP STREET, SUITE 800 3. Date of Earliest Transaction (MM/DD/YY) 03/01/2024 (Street) DENVER, CO80202 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/01/2024 D 438 D 9,211 D Common Stock 03/01/2024 F 574 ( 2 ) D $ 101.2 8,637 ( 3 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units $ 0 03/01/2024 A 5,877 ( 4 ) ( 4 ) Common Stock 5,877 $ 0 5,877 D Performance Units $ 0 03/01/2024 A V 5,877 ( 5 ) ( 5 ) Common Stock 5,877 $ 0 5,877 D Phantom Stock ( 6 ) 03/01/2024 A 438 ( 6 ) ( 6 ) Common Stock 438 ( 1 ) 438 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Vonne Elizabeth Karpinski 1595 WYNKOOP STREET, SUITE 800 DENVER, CO80202 EVP, General Counsel Signatures /s/ Elizabeth K. Vonne 03/05/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In connection with the 03/01/2024 vesting of previously granted restricted stock units, the reporting person's receipt of 438 shares of common stock was deferred pursuant to the reporting person's election under the Company's deferred compensation plan (the "Plan"), resulting in the reporting person's receipt instead of 438 shares of phantom stock. ( 2 )Payment of tax liability by withholding securities incident to vesting of restricted stock units. ( 3 )Represents 6,933 unvested restricted stock units and 1,704 shares of common stock. ( 4 )Employee restricted stock units granted 3/1/2024 under the Company's 2024 Long-Term Incentive Plan ("2024 LTI Plan"), which will vest in 3 equal installments beginning on the first anniversary of the grant date. ( 5 )These performance share awards were issued pursuant to the 2024 LTI Plan at 100% of target, have a 3-year vest period, and will vest in all or in part upon achievement of performance metrics. Any awards that have not been vested and released at the end of the 3-year period will be canceled. ( 6 )Each share of phantom stock represents a right to receive one share of common stock or the cash value thereof. Shares of phantom stock become payable in accordance with the reporting person's distribution elections made pursuant to the Plan or upon the reporting person's termination of service, death, or disability. Subject to certain timing restrictions, the reporting person may transfer some or all of the shares of phantom stock into alternative investments under the terms of the Plan.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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