Aehr Test Systems CFO reports 1,089-share acquisition

A trust-held employee-plan purchase is reported alongside tax withholding from vested restricted stock units, which was not a sale.

Rhea-AI Filing Summary

AEHR Test Systems CFO Chris Siu reported two transactions on October 1, 2026. A trust acquired 1,089 shares through the company’s Amended and Restated 2006 Employee Stock Purchase Plan at $6.6725 per share, with a reported trust holding of 6,795 shares afterward. Separately, 194 shares were withheld for tax obligations upon restricted stock unit vesting; this was not a sale. Siu’s reported direct holdings afterward were 77,134 shares, including shares subject to unvested restricted stock units. No Rule 10b5-1 plan is reported.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Siu Chris

Role CFO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	194	$101.60	$20K
Other	Common Stock F3	1,089	$6.6725	$7K

Holdings After Transaction: Common Stock — 77,134 shares (Direct); Common Stock — 6,795 shares (Indirect, By Trust)

Footnotes (3)

1. F1. 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.
2. F2. The amount reported includes shares subject to unvested restricted stock units.
3. F3. 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.

Key Figures

Shares acquired through trust: 1,089 shares Reported price per share: $6.6725 Trust shares after transaction: 6,795 shares +3 more

6 metrics

Shares acquired through trust 1,089 shares Employee stock purchase plan transaction on October 1, 2026

Reported price per share $6.6725 Trust acquisition through the employee stock purchase plan

Trust shares after transaction 6,795 shares Reported after the October 1, 2026 acquisition

Shares withheld for taxes 194 shares Withheld upon restricted stock unit vesting on October 1, 2026; not a sale

Reported price per share $101.60 Shares withheld for tax obligations upon restricted stock unit vesting

Direct shares after transaction 77,134 shares Reported after the October 1, 2026 withholding; includes shares subject to unvested restricted stock units

Key Terms

restricted stock units, tax-conditioned plan, short-swing transactions

3 terms

restricted stock units financial

"upon 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.

tax-conditioned plan financial

"a "tax-conditioned plan""

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 CFO Chris Siu acquire through a trust?

A trust reported indirectly for Chris Siu acquired 1,089 AEHR common shares on October 1, 2026, through the Amended and Restated 2006 Employee Stock Purchase Plan at $6.6725 per share. The reported trust holding afterward was 6,795 shares. No Rule 10b5-1 plan is reported.

Why were 194 AEHR shares withheld from CFO Chris Siu?

194 shares were withheld to satisfy tax-withholding obligations upon vesting of restricted stock units; the transaction does not represent a sale. Siu’s reported direct holdings afterward were 77,134 shares, including shares subject to unvested restricted stock units.

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

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Available on EDGAR 10/01/2026 - 08:03 PM Accepted by SEC EDGAR 10/01/2026 - 08:03 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^*

Siu Chris

(Last) (First) (Middle)

C/O AEHR TEST SYSTEMS

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)
	CFO

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		F		194(1)	D	$101.6	77,134(2)	D
Common Stock	10/01/2026		J		1,089(3)	A	$6.6725	6,795	I	By Trust

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. 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.

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

3. 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.

Remarks:

	/s/SIU CHRIS	10/01/2026
	** 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)