STOCK TITAN

Advanced Energy (AEIS) director converts 2,313 RSUs to stock

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

ADVANCED ENERGY INDUSTRIES INC director Ronald C. Foster reported routine equity compensation activity. On May 2, 2026, he exercised 2,313 restricted stock units that were granted on May 2, 2025, converting them into the same number of common shares on a one-for-one basis at a stated price of $0.00 per share. Following this vesting and conversion, he holds 6,663 common shares directly, while additional indirect holdings are reported through the Kathryn A. Foster 2020 Spousal Trust and the Ronald C. Foster 2021 Trust, each showing 18,425 common shares held with trustee and beneficiary relationships disclosed.

Positive

  • None.

Negative

  • None.
Insider FOSTER RONALD C
Role null
Type Security Shares Price Value
Exercise Restricted Stock Units 2,313 $0.00 --
Exercise Common Stock 2,313 $0.00 --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 6,663 shares (Direct, null); Common Stock — 18,425 shares (Indirect, By Self As Trustee)
Footnotes (1)
  1. 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. Shares held by the Kathryn A. Foster 2020 Spousal Trust, where the reporting person serves as a trustee and is a beneficiary. Shares held by the Ronald C. Foster 2021 Trust, where his spouse serves as trustee and is a beneficiary. Restricted stock units are not exercisable and do not have an expiration date.
RSUs converted 2,313 units Restricted stock units converting into common stock on a one-for-one basis
Direct shares after transaction 6,663 shares Common stock held directly by Ronald C. Foster following RSU conversion
Spousal trust holdings 18,425 shares Common stock held by the Kathryn A. Foster 2020 Spousal Trust
Self trust holdings 18,425 shares Common stock held by the Ronald C. Foster 2021 Trust
Grant date of RSUs May 2, 2025 Date 2,313 restricted stock units were granted to Ronald C. Foster
Exercise/vesting date May 2, 2026 Transaction date for conversion of restricted stock units into common stock
Exercise price per RSU $0.00 per unit Stated conversion price for restricted stock units into common stock
restricted stock units financial
"the reporting person was granted 2,313 restricted stock units, which vested on the one-year anniversary"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
derivative security financial
"transaction_code_description": "Exercise or conversion of derivative security""
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
Spousal Trust financial
"Shares held by the Kathryn A. Foster 2020 Spousal Trust, where the reporting person serves as a trustee"
beneficiary financial
"where the reporting person serves as a trustee and is a beneficiary"
indirect ownership financial
""ownership_type": "indirect", "ownership_code": "I""
Exercise or conversion financial
"transaction_action": "derivative exercise/conversion", "transaction_code_description": "Exercise or conversion of derivative security""
SEC Form 4
FORM 4UNITED 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
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
FOSTER RONALD C

(Last)(First)(Middle)
1595 WYNKOOP STREET, SUITE 800

(Street)
DENVER COLORADO 80202

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
ADVANCED ENERGY INDUSTRIES INC [ AEIS ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/02/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)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)
CodeVAmount(A) or (D)Price
Common Stock05/02/2026M2,313A(1)6,663D
Common Stock18,425IBy Self As Trustee(2)
Common Stock18,425IBy Spouse As Trustee(3)
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 (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)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 (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (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: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(1)05/02/2026M2,313 (4) (4)Common Stock2,313$00D
Explanation of Responses:
1. 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.
2. Shares held by the Kathryn A. Foster 2020 Spousal Trust, where the reporting person serves as a trustee and is a beneficiary.
3. Shares held by the Ronald C. Foster 2021 Trust, where his spouse serves as trustee and is a beneficiary.
4. Restricted stock units are not exercisable and do not have an expiration date.
/s/ Elizabeth Vonne - Attorney-in-Fact05/05/2026
** Signature of Reporting PersonDate
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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider activity did AEIS director Ronald C. Foster report on this Form 4?

Ronald C. Foster reported the vesting and conversion of 2,313 restricted stock units into common stock. This non-cash transaction reflects routine equity compensation rather than an open-market purchase or sale, updating his direct and indirect ownership in Advanced Energy Industries.

How many AEIS shares did Ronald C. Foster acquire through RSU conversion?

He acquired 2,313 shares of Advanced Energy Industries common stock via conversion of 2,313 restricted stock units. The filing notes a conversion price of $0.00 per unit, consistent with stock-based compensation rather than a cash purchase on the open market.

What are Ronald C. Foster’s direct AEIS share holdings after this transaction?

After the RSU conversion, Ronald C. Foster directly holds 6,663 shares of Advanced Energy Industries common stock. This figure reflects his updated direct ownership position disclosed in the Form 4 and does not include additional indirect holdings through related trusts.

When were the restricted stock units granted and when did they vest for AEIS director Foster?

The filing states that 2,313 restricted stock units were granted to Ronald C. Foster on May 2, 2025. These units vested on the one-year anniversary of the grant date, and on vesting they converted into common stock on a one-for-one basis as described in the footnotes.

What indirect AEIS holdings are reported for Ronald C. Foster via trusts?

The Form 4 shows 18,425 AEIS shares held by the Kathryn A. Foster 2020 Spousal Trust and 18,425 shares held by the Ronald C. Foster 2021 Trust. Footnotes explain his and his spouse’s roles as trustees and beneficiaries, indicating these positions are reported as indirect ownership.

Do the reported AEIS insider transactions involve any open-market buying or selling?

No open-market purchases or sales are reported in this Form 4. The primary coded transaction is an M-code event, representing the exercise or conversion of 2,313 restricted stock units into common stock, a standard equity compensation mechanism rather than a market trade.