Teradyne (NYSE: TER) director trims stake in preset 10b5-1 sale

Rhea-AI Filing Summary

TERADYNE, INC (TER) director Marilyn Matz reported selling 1,200 shares of common stock on August 17, 2026 at $425.00 per share in an open-market or private transaction. After this sale, she directly holds 15,040.675 shares. The transaction was executed under a Rule 10b5-1 trading plan adopted on February 13, 2026.

Insider Trade Summary 10b5-1

Net Seller: 1,200 shares

Net Sell 1 txn

Insider MATZ MARILYN

Role Director

Sold 1,200 shs ($510K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	1,200	$425.00	$510K

Holdings After Transaction: Common Stock — 15,040.675 shares (Direct)

Footnotes (1)

1. F1. The reported transaction was effected pursuant to a sales plan adopted by the Reporting Person on February 13, 2026 and intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934.

Key Figures

Shares sold: 1,200 shares Sale price per share: $425.00 per share Post-transaction holdings: 15,040.675 shares +2 more

5 metrics

Shares sold 1,200 shares Common stock sale reported by director Marilyn Matz on August 17, 2026

Sale price per share $425.00 per share Per-share price for the 1,200 TER shares sold

Post-transaction holdings 15,040.675 shares Directly held TER common stock after the reported sale

Net shares sold 1,200 shares Net sell volume across all transactions in this Form 4

10b5-1 plan adoption date February 13, 2026 Adoption date of the Rule 10b5-1 sales plan governing the transaction

Key Terms

Rule 10b5-1, sales plan, transaction code "S"

3 terms

Rule 10b5-1 regulatory

"intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

sales plan regulatory

"The reported transaction was effected pursuant to a sales plan adopted by the Reporting Person"

transaction code "S" financial

"transaction_code "S" indicates a sale in open market or private transaction"

FAQ

What insider transaction did TER (Teradyne, Inc.) report for Marilyn Matz?

Teradyne director Marilyn Matz reported a sale of 1,200 shares of common stock on August 17, 2026. The transaction was coded as a sale in an open-market or private transaction.

At what price were the TER shares sold in Marilyn Matz’s Form 4 filing?

The reported sale by Marilyn Matz was executed at $425.00 per share. This price is identified as the per-share transaction price for the 1,200 shares of Teradyne common stock sold.

How many TER shares does Marilyn Matz hold after the reported sale?

Following the transaction, Marilyn Matz directly holds 15,040.675 shares of Teradyne common stock. This post-transaction holding reflects her position after selling 1,200 shares in the reported Form 4 transaction.

Was the TER insider sale by Marilyn Matz under a Rule 10b5-1 trading plan?

Yes. The sale was made pursuant to a Rule 10b5-1 trading plan. The footnote states the plan was adopted on February 13, 2026 and was intended to comply with Rule 10b5-1 under the Exchange Act.

Is the Marilyn Matz transaction in TER stock a buy or a sell?

The transaction is a sale of Teradyne common stock. The Form 4 reports a transaction code “S” and an acquired/disposed code indicating disposition, with 1,200 shares sold and no shares acquired in this filing.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 11:09 AM Accepted by SEC EDGAR 08/18/2026 - 11:09 AM 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).

X

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^*

MATZ MARILYN

(Last) (First) (Middle)

C/O TERADYNE, INC.

600 RIVERPARK DRIVE

(Street)

NORTH READING MASSACHUSETTS 01864

(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)
08/17/2026

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	08/17/2026		S(1)		1,200	D	$425	15,040.675	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. The reported transaction was effected pursuant to a sales plan adopted by the Reporting Person on February 13, 2026 and intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934.

	/s/ Ryan E. Driscoll, Attorney-in-Fact	08/18/2026
	** 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)