[Form 4] AEHR TEST SYSTEMS Insider Trading Activity

AEHR Test Systems Executive VP of R&D Didier Wimmers completed an internal share purchase through the company’s employee stock purchase plan.

Rhea-AI Filing Summary

AEHR Test Systems Executive VP of R&D Didier Wimmers completed an internal share purchase through the company’s employee stock purchase plan. On April 1, 2026, he acquired 1,873 shares of common stock at $6.6725 per share.

Following this transaction, Wimmers directly holds 16,059 shares of AEHR common stock, which includes shares tied to unvested restricted stock units. The purchase was made under the company’s tax-qualified Employee Stock Purchase Plan, which is treated as a tax-conditioned plan under Internal Revenue Code Section 423 and is exempt from certain short-swing trading liability rules.

Insider Trade Summary

Other: 1,873 shares

Other 1 txn

Insider WIMMERS DIDIER

Role Executive VP of R&D

Type	Security	Shares	Price	Value
Other	Common Stock	1,873	$6.6725	$12K

Holdings After Transaction: Common Stock — 16,059 shares (Direct)

Footnotes (2)

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

Key Figures

Shares acquired: 1,873 shares Purchase price: $6.6725 per share Total shares after transaction: 16,059 shares +1 more

4 metrics

Shares acquired 1,873 shares Common Stock purchased on April 1, 2026 via ESPP

Purchase price $6.6725 per share Price for ESPP purchase on April 1, 2026

Total shares after transaction 16,059 shares Direct holdings after ESPP purchase, including unvested RSUs

Restructuring-classified shares 1,873 shares Shares tagged as restructuring-related in transaction summary

Key Terms

Employee Stock Purchase Plan, tax-conditioned plan, Internal Revenue Code Section 423, short-swing transactions, +1 more

5 terms

Employee Stock Purchase Plan financial

"These shares have been purchased through the Company's Amended and Restated 2006 Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

tax-conditioned plan financial

"a "tax-conditioned plan" per Internal Revenue Code Section 423"

Internal Revenue Code Section 423 financial

"a "tax-conditioned plan" per Internal Revenue Code Section 423"

short-swing transactions regulatory

"exempt from Section 16 of the Securities Exchange Act of 1934 regarding liabilities arising from six-month short-swing transactions"

restricted stock units financial

"The amount reported includes shares subject to unvested 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.

FAQ

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

What insider transaction did AEHR Executive VP of R&D Didier Wimmers report?

Didier Wimmers reported acquiring 1,873 AEHR shares through the company’s Employee Stock Purchase Plan at $6.6725 per share. This is an internal, plan-based purchase rather than an open-market trade, reflecting his ongoing participation in the company’s stock purchase program.

How many AEHR shares does Didier Wimmers hold after this Form 4 filing?

After the transaction, Wimmers holds 16,059 AEHR shares directly. This total includes shares underlying unvested restricted stock units, meaning part of his position remains subject to vesting conditions typically tied to continued employment or time-based service requirements.

Was the AEHR insider transaction an open-market buy or part of an employee plan?

The transaction was part of AEHR’s Employee Stock Purchase Plan, not an open-market trade. Shares were purchased under the Amended and Restated 2006 Employee Stock Purchase Plan, a tax-conditioned program designed to let employees buy company stock on favorable terms.

What does it mean that the AEHR purchase is a tax-conditioned plan under Section 423?

Being a Section 423 tax-conditioned plan means the Employee Stock Purchase Plan meets specific IRS rules, giving employees potential tax advantages. It also clarifies that these purchases are structured and regulated, rather than discretionary open-market buying by the insider.

Does this AEHR Form 4 transaction involve unvested restricted stock units (RSUs)?

Yes, the reported holdings include shares from unvested RSUs. The filing notes that Wimmers’ total 16,059-share position reflects common shares plus those subject to unvested restricted stock units, which will vest over time if plan conditions are satisfied.

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

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Accepted by SEC EDGAR 04/03/2026 - 01:42 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)
04/01/2026

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	04/01/2026		J		1,873(1)	A	$6.6725	16,059(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	04/03/2026
	** 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)