AEHR Form 4: Executive VP acquires 1,628 shares via IRC 423 ESPP

Rhea-AI Filing Summary

Didier Wimmers, Executive Vice President of R&D at Aehr Test Systems (AEHR), purchased 1,628 shares of AEHR common stock on 10/01/2025 at $6.6725 per share under the Company’s Amended and Restated 2006 Employee Stock Purchase Plan, which the filing notes is a tax-conditioned plan under IRC Section 423 and is exempt from Section 16 short-swing liability. After the purchase, the filing reports 14,921 total shares beneficially owned, an amount that the filer states includes shares subject to unvested restricted stock units. The Form 4 was filed by one reporting person and signed by an attorney-in-fact on behalf of the reporting person.

Positive

• Insider acquisition disclosed: Executive VP purchased 1,628 shares through the company ESPP, showing participation in the employee plan
• Transaction exempt under IRC Section 423: Filing explicitly states the purchase is tax-conditioned and exempt from six-month short-swing liability
• Clear beneficial ownership disclosure: Post-transaction ownership of 14,921 shares is reported and notes inclusion of unvested restricted stock units

Negative

• None.

Insights

Financial Analyst

TL;DR: An insider acquired a small block of shares through the company ESPP, modestly increasing beneficial ownership.

The transaction is an employee stock purchase plan acquisition of 1,628 shares at $6.6725 on 10/01/2025, recorded on a Form 4. Because the shares were bought under an IRC Section 423 tax-conditioned ESPP, the filing explicitly notes exemption from six-month short-swing liability under Section 16. The reported post-transaction beneficial ownership is 14,921 shares, which includes unvested restricted stock units; the filing does not disclose the proportion of vested versus unvested shares or the holder’s total economic exposure. This is a routine insider transaction with limited immediate valuation impact given disclosed sizes.

Corporate Governance Expert

TL;DR: Disclosure complies with Section 16 formatting; purchase via IRC 423 ESPP is properly identified and signed by an attorney-in-fact.

The Form 4 identifies the reporting person, role as Executive VP of R&D, transaction date, quantity purchased, price, and that the shares were acquired under the company’s amended ESPP. It also clarifies inclusion of unvested restricted stock units in the beneficial ownership total. The form is signed by an attorney-in-fact, satisfying signature requirements. No amendments, dispositions, derivative transactions, or additional material governance events are reported.

10/01/2025 - 09:37 PM

SEC Form 4

FORM 4

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
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).

1. Name and Address of Reporting Person^*

WIMMERS DIDIER

(Last) (First) (Middle)

400 KATO TERRACE

(Street)

FREMONT CA 94539

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AEHR TEST SYSTEMS [ AEHR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive VP of R&D

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/01/2025		J		1,628(1)	A	$6.6725	14,921(2)	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 (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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These shares have been purchased through the Company's Amended and Restated 2006 Employee Stock Purchase Plan, a "tax-conditioned plan" per Internal Revenue Code Section 423. This purchase is exempt from Section 16 of the Securities Exchange Act of 1934 regarding liabilities arising from six-month short-swing transactions in the Company's securities.

2. The amount reported includes shares subject to unvested restricted stock units.

Remarks:

	/s/Chris Siu, Attorney-in-Fact	10/01/2025
	** Signature of Reporting Person	Date
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.

FAQ

What did AEHR insider Didier Wimmers purchase on 10/01/2025?

He purchased 1,628 shares of AEHR common stock on 10/01/2025 at a price of $6.6725 per share under the company’s ESPP.

Is the ESPP purchase subject to Section 16 short-swing rules for AEHR?

No. The filing states the purchase was made under a tax-conditioned plan per IRC Section 423 and is exempt from six-month short-swing liability.

How many AEHR shares does Didier Wimmers beneficially own after the transaction?

14,921 shares are reported as beneficially owned following the reported transaction; this total includes shares subject to unvested restricted stock units.

Who signed the Form 4 for this AEHR filing?

The form was signed by Chris Siu, Attorney-in-Fact on behalf of the reporting person on 10/01/2025.

Was this Form 4 filed by multiple reporting persons?

No. The form indicates it was filed by one reporting person.