Ronald C. Foster - 02 May 2026 Form 4 Insider Report for ADVANCED ENERGY INDUSTRIES INC (AEIS)

Reporting relationship: Director
Issuer ticker: AEIS
Reported as of: 02 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 May 2026, 20:41:36 UTC
Prior SEC filing: 06 May 2025
Next SEC filing: 08 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Elizabeth Vonne - Attorney-in-Fact

Key filing fact

Ronald C. Foster filed Form 4 for ADVANCED ENERGY INDUSTRIES INC (AEIS) on 05 May 2026.

Key facts

This page summarizes Ronald C. Foster's Form 4 filing for ADVANCED ENERGY INDUSTRIES INC (AEIS).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 May 2026, 20:41.

Change

Previous filing in this sequence was filed on 06 May 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001222896 Primary reporting owner

FOSTER RONALD C

Relationship: Director
Address: 1595 WYNKOOP STREET, SUITE 800, DENVER
Signature: /s/ Elizabeth Vonne - Attorney-in-Fact
Signature date: 05 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AEIS transaction

Common Stock

Options Exercise

Transaction value
Shares: +2,313
Change %: +53%
Price
Shares after: 6,663
Date: 02 May 2026
Ownership: Direct
Footnotes: F1

AEIS holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 18,425
Date: 02 May 2026
Ownership: By Self As Trustee
Footnotes: F2

AEIS holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 18,425
Date: 02 May 2026
Ownership: By Spouse As Trustee
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AEIS transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -2,313
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 02 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,313
Exercise price
Footnotes: F1, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

On May 2, 2025, the reporting person was granted 2,313 restricted stock units, which vested on the one-year anniversary of the grant date. Restricted stock units convert into common stock on a one-for-one basis.

Footnote F2

Shares held by the Kathryn A. Foster 2020 Spousal Trust, where the reporting person serves as a trustee and is a beneficiary.

Footnote F3

Shares held by the Ronald C. Foster 2021 Trust, where his spouse serves as trustee and is a beneficiary.

Footnote F4

Restricted stock units are not exercisable and do not have an expiration date.