Teradyne director Peter Herweck acquires 81 stock units

The DSUs are generally settled one-for-one in Teradyne common stock within 90 days after his non-employee director service ends.

Rhea-AI Filing Summary

Teradyne, Inc. director Peter Herweck acquired 77 deferred stock units (DSUs) on September 24, 2026, through deferral of quarterly cash compensation. He acquired 4 additional DSUs on September 25, 2026, after electing to receive dividends on DSUs as additional DSUs rather than cash. The DSUs are generally settled one-for-one in Common Stock within 90 days after his service as a non-employee director ends.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Herweck Peter

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock F2	4	$0.00	$0.00
Grant/Award	Common Stock F1	77	$0.00	$0.00

Holdings After Transaction: Common Stock — 16,282 shares (Direct)

Footnotes (2)

1. F1. Represents the Reporting Person's deferral of his quarterly cash compensation into deferred stock units ("DSUs"). The number of DSUs is calculated based on the closing price of the Common Stock on their date of issuance. DSUs are settled one-for-one in Common Stock generally within ninety days of the date as of which a non-employee director no longer serves in such capacity.
2. F2. Represents DSUs issued to the Reporting Person in accordance with his election to receive dividends paid on DSUs in the form of additional DSUs in lieu of cash. Such acquisition is exempt under Exchange Act Rule 16b-3(d). DSUs are settled one-for-one in Common Stock generally within ninety days of the date as of which a non-employee director no longer serves in such capacity.

Key Figures

DSUs acquired: 77 DSUs Additional DSUs acquired: 4 DSUs DSU settlement: One-for-one in Common Stock +1 more

4 metrics

DSUs acquired 77 DSUs Through deferral of quarterly cash compensation on September 24, 2026

Additional DSUs acquired 4 DSUs From his election to receive dividends on DSUs as additional DSUs on September 25, 2026

DSU settlement One-for-one in Common Stock General settlement terms

Settlement period Within 90 days Generally after the date a non-employee director no longer serves in that capacity

Key Terms

deferred stock units ("DSUs"), Rule 16b-3(d), settled one-for-one in Common Stock

3 terms

deferred stock units ("DSUs") financial

"deferral of his quarterly cash compensation into deferred stock units ("DSUs")"

Rule 16b-3(d) regulatory

"Such acquisition is exempt under Exchange Act Rule 16b-3(d)."

Rule 16b-3(d) is a narrow SEC safe-harbor that shields company insiders (officers, directors and large shareholders) from liability for short‑swing profits when their buys or sells of company stock are made under a pre-established, written plan or contract that removes the insider’s ability to time trades. For investors, this matters because it permits predictable, automated insider transactions — like scheduled sales for diversification or payroll withholding — without triggering forced disgorgement, so such planned trades are treated differently from opportunistic insider trading.

settled one-for-one in Common Stock financial

"DSUs are settled one-for-one in Common Stock"

FAQ

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

How many DSUs did TER director Peter Herweck acquire?

Peter Herweck acquired 77 DSUs on September 24, 2026, by deferring quarterly cash compensation, and acquired 4 additional DSUs on September 25, 2026, through his election to receive dividends on DSUs as additional DSUs rather than cash.

How are TER director Peter Herweck's DSUs settled?

They are generally settled one-for-one in Common Stock within 90 days of the date as of which Peter Herweck no longer serves as a non-employee director.

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

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Available on EDGAR 09/28/2026 - 05:33 PM Accepted by SEC EDGAR 09/28/2026 - 05:32 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^*

Herweck Peter

(Last) (First) (Middle)

TERADYNE, INC.

600 RIVERPARK DRIVE

(Street)

NORTH READING MASSACHUSETTS

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/24/2026

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	09/24/2026		A		77(1)	A	$0(1)	16,278	D
Common Stock	09/25/2026		J(2)		4(2)	A	$0(2)	16,282	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. Represents the Reporting Person's deferral of his quarterly cash compensation into deferred stock units ("DSUs"). The number of DSUs is calculated based on the closing price of the Common Stock on their date of issuance. DSUs are settled one-for-one in Common Stock generally within ninety days of the date as of which a non-employee director no longer serves in such capacity.

2. Represents DSUs issued to the Reporting Person in accordance with his election to receive dividends paid on DSUs in the form of additional DSUs in lieu of cash. Such acquisition is exempt under Exchange Act Rule 16b-3(d). DSUs are settled one-for-one in Common Stock generally within ninety days of the date as of which a non-employee director no longer serves in such capacity.

	/s/ Ryan E. Driscoll, Attorney-in-Fact	09/28/2026
	** 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)