AEHR CFO reports tax RSU withholding, ESPP buy

AEHR Test Systems CFO Chris Siu reported routine equity-related transactions in company stock.

Rhea-AI Filing Summary

AEHR Test Systems CFO Chris Siu reported routine equity-related transactions in company stock. On April 2, 821 shares of common stock at $44.32 per share were withheld to cover tax obligations upon vesting of restricted stock units, which the company notes is not a market sale. On April 1, 2,095 shares at $6.6725 per share were acquired through the company’s Employee Stock Purchase Plan and are held indirectly in a trust. Following these transactions, Siu holds 71,437 shares directly and 7,306 shares indirectly, with the indirect amount including shares subject to unvested restricted stock units.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Siu Chris

Role CFO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	821	$44.32	$36K
Other	Common Stock	2,095	$6.6725	$14K

Holdings After Transaction: Common Stock — 71,437 shares (Direct); Common Stock — 7,306 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

Tax withholding shares: 821 shares at $44.32 ESPP acquisition: 2,095 shares at $6.6725 Direct holdings after transactions: 71,437 shares +1 more

4 metrics

Tax withholding shares 821 shares at $44.32 Shares withheld on April 2, 2026 for RSU tax obligations

ESPP acquisition 2,095 shares at $6.6725 Shares acquired April 1, 2026 via Employee Stock Purchase Plan by trust

Direct holdings after transactions 71,437 shares Common stock held directly by CFO after April 2, 2026 transaction

Indirect holdings after transactions 7,306 shares Common stock held indirectly by trust after April 1, 2026 transaction, includes unvested RSUs

Key Terms

restricted stock units, tax-conditioned plan, Employee Stock Purchase Plan, Section 16, +1 more

5 terms

restricted stock units financial

"Represents shares that were withheld to satisfy tax withholding obligations 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" per Internal Revenue Code Section 423."

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.

Section 16 regulatory

"This purchase is 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.

short-swing transactions regulatory

"regarding liabilities arising from six-month short-swing transactions in the Company's securities."

FAQ

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

What insider transactions did AEHR CFO Chris Siu report on this Form 4?

AEHR CFO Chris Siu reported tax-related share withholding and an Employee Stock Purchase Plan acquisition. 821 shares were withheld for RSU tax obligations, and 2,095 shares were acquired through the plan and held in a trust, reflecting routine, non-market transactions.

Did AEHR CFO Chris Siu sell shares of AEHR stock in the open market?

No open-market sale occurred. 821 AEHR shares were withheld to satisfy tax obligations when restricted stock units vested. The filing explicitly states this withholding does not represent a sale, distinguishing it from discretionary market transactions by the CFO.

How many AEHR shares does CFO Chris Siu hold after these transactions?

After these transactions, CFO Chris Siu holds 71,437 AEHR shares directly and 7,306 shares indirectly through a trust. The indirect amount includes shares subject to unvested restricted stock units, indicating both current ownership and equity-based compensation exposure.

What is the significance of the 821 AEHR shares withheld at $44.32 per share?

The 821 AEHR shares at $44.32 per share were withheld to cover tax liabilities tied to vesting restricted stock units. This is an administrative, compensation-related event and, as noted in the filing, does not represent a voluntary sale decision by the CFO.

How were the 2,095 AEHR shares at $6.6725 per share acquired by the trust?

The 2,095 AEHR shares at $6.6725 per share were acquired through the company’s Amended and Restated 2006 Employee Stock Purchase Plan. The filing describes this as a tax-conditioned plan under Internal Revenue Code Section 423 and notes the transaction is exempt from Section 16 short-swing rules.

Why does the AEHR Form 4 mention shares subject to unvested restricted stock units?

The Form 4 notes that the reported holdings include shares subject to unvested restricted stock units. This means part of CFO Chris Siu’s indirect AEHR position represents future share delivery tied to continued service or vesting conditions, rather than fully vested, freely tradable stock.

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

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Accepted by SEC EDGAR 04/02/2026 - 08:25 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)
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	04/02/2026		F		821(1)	D	$44.32	71,437(2)	D
Common Stock	04/01/2026		J		2,095(3)	A	$6.6725	7,306	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	04/02/2026
	** 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)