AEHR Test Systems’ Didier Wimmers buys 1,311 shares

The 54 shares withheld were for tax obligations on restricted stock unit vesting, and the footnote says this was not a sale.

Rhea-AI Filing Summary

AEHR Test Systems Executive VP of R&D Didier Wimmers acquired 1,311 common shares at $6.6725 per share on October 1, 2026, through the company’s employee stock purchase plan. No Rule 10b5-1 plan is reported. On the same date, 54 shares were withheld at $101.60 per share to satisfy tax withholding obligations upon vesting of restricted stock units; the footnote says this was not a sale.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider WIMMERS DIDIER

Role Executive VP of R&D

Type	Security	Shares	Price	Value
Other	Common Stock F1	1,311	$6.6725	$9K
Tax Withholding	Common Stock F2, F3	54	$101.60	$5K

Holdings After Transaction: Common Stock — 13,636 shares (Direct)

Footnotes (3)

1. F1. 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. F2. Represents shares that were withheld to satisfy tax withholding obligations upon vesting of restricted stock units. This does not represent a sale by the Reporting Person.
3. F3. The amount reported includes shares subject to unvested restricted stock units.

Key Figures

Shares acquired: 1,311 common shares Purchase price: $6.6725 per share Shares withheld for taxes: 54 shares +1 more

4 metrics

Shares acquired 1,311 common shares October 1, 2026

Purchase price $6.6725 per share Shares acquired October 1, 2026

Shares withheld for taxes 54 shares Upon vesting of restricted stock units on October 1, 2026

Price of shares withheld $101.60 per share October 1, 2026

Key Terms

tax-conditioned plan, restricted stock units, Section 16, six-month short-swing transactions

4 terms

tax-conditioned plan financial

"a “tax-conditioned plan”"

restricted stock units financial

"vesting of restricted stock units"

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.

Section 16 regulatory

"exempt from Section 16 of the Securities Exchange Act of 1934"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

six-month short-swing transactions regulatory

"liabilities arising from six-month short-swing transactions"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many AEHR shares did Didier Wimmers acquire and have withheld?

Didier Wimmers, AEHR Test Systems’ Executive VP of R&D, acquired 1,311 common shares at $6.6725 per share on October 1, 2026, and 54 shares were withheld at $101.60 per share for tax obligations upon restricted stock unit vesting. The footnote says the withholding did not represent a sale. No Rule 10b5-1 plan is reported.

How did Didier Wimmers acquire the AEHR shares?

The 1,311-share purchase was through AEHR Test Systems’ Amended and Restated 2006 Employee Stock Purchase Plan, described as a “tax-conditioned plan” under Internal Revenue Code Section 423. The footnote states that the purchase is exempt from Section 16 liabilities arising from six-month short-swing transactions in the company’s securities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/02/2026 - 06:14 PM Accepted by SEC EDGAR 10/02/2026 - 06:13 PM Learn about SEC filing dates

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).

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^*

WIMMERS DIDIER

(Last) (First) (Middle)

400 KATO TERRACE

(Street)

FREMONT CALIFORNIA 94539

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

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

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/01/2026		J		1,311(1)	A	$6.6725	13,690	D
Common Stock	10/01/2026		F		54(2)	D	$101.6	13,636(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 (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. Represents shares that were withheld to satisfy tax withholding obligations upon vesting of restricted stock units. This does not represent a sale by the Reporting Person.

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

Remarks:

	/s/Chris Siu, Attorney-in-Fact	10/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)