Teradyne (TER) Product Test president reports RSU tax share withholdings

Rhea-AI Filing Summary

Teradyne, Inc. executive reports tax-related share withholdings tied to RSU vesting. President, Product Test, Mills Regan reported two transactions coded "F," which indicate shares withheld by the company to cover taxes when restricted stock units vested on January 27 and January 28, 2026.

The company withheld 193 shares at $238.94 and 167 shares at $250.48. After these non‑open‑market transactions, Regan directly beneficially owns 12,018.3452 shares of Teradyne common stock, including shares previously acquired through the Employee Stock Purchase Plan.

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

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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^*

Mills Regan

(Last) (First) (Middle)

TERADYNE, INC.

600 RIVERPARK DRIVE

(Street)

NORTH READING MA 01864

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
TERADYNE, INC [ TER ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, Product Test

3. Date of Earliest Transaction (Month/Day/Year)
01/27/2026

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	01/27/2026		F		193(1)	D	$238.94	12,185.3452(2)	D
Common Stock	01/28/2026		F		167(3)	D	$250.48	12,018.3452	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. Shares withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units ("RSUs") on January 27, 2026.

2. Includes 98.7673 shares acquired under the Issuer's Employee Stock Purchase Plan on June 30, 2025, and 64.5779 shares acquired under the Issuer's Employee Stock Purchase Plan on December 31, 2025.

3. Shares withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of RSUs on January 28, 2026.

	/s/ Ryan E. Driscoll, Attorney-in-Fact	01/29/2026
	** 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).
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FAQ

What insider activity did Teradyne (TER) report for Mills Regan?

Teradyne reported that President, Product Test, Mills Regan had company shares withheld to cover taxes on restricted stock units that vested on January 27 and January 28, 2026. These are administrative tax-withholding transactions, not open-market stock sales or purchases.

How many Teradyne (TER) shares were involved in Mills Regan’s Form 4 filing?

The filing shows 193 shares withheld at $238.94 and 167 shares withheld at $250.48. These shares were retained by Teradyne to satisfy tax obligations triggered by the vesting of restricted stock units granted to Mills Regan.

Does Mills Regan still hold Teradyne (TER) stock after these transactions?

Yes. After the reported tax-withholding transactions, Mills Regan directly beneficially owns 12,018.3452 shares of Teradyne common stock. This total includes shares previously acquired through the company’s Employee Stock Purchase Plan in June and December 2025.

Were Mills Regan’s Teradyne (TER) transactions open-market sales?

No. Both transactions are coded "F," meaning they are share withholdings by Teradyne to cover income tax on vesting restricted stock units. They do not represent discretionary open-market sales initiated by Mills Regan on an exchange.

What role does Mills Regan hold at Teradyne (TER)?

Mills Regan is an officer of Teradyne serving as President, Product Test. As a Section 16 reporting person, Regan must disclose changes in beneficial ownership of Teradyne common stock, including tax-withholding events tied to equity compensation vesting.

How were employee stock purchase plan shares reflected in this Teradyne (TER) filing?

The filing notes that Regan’s beneficial ownership total includes 98.7673 shares acquired under Teradyne’s Employee Stock Purchase Plan on June 30, 2025, and 64.5779 shares acquired on December 31, 2025, consolidating them into the reported share balance.