Small Rule 10b5-1 stock sale by Teradyne (TER) product test chief

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Teradyne executive Regan Mills reported a small stock sale. As President, Product Test at Teradyne, Mills sold 16 shares of common stock on April 8, 2026 at $342.17 per share, leaving 11,399.3452 shares directly owned.

According to the footnote, this additional sale corrected the number of shares previously withheld to cover taxes on restricted stock units that vested on April 1, 2026. The trade was made under a pre-arranged sales plan adopted on November 25, 2025 and intended to comply with Rule 10b5-1, indicating it was part of a scheduled program rather than a discretionary market-timing decision.

Insider Trade Summary 10b5-1

Net Seller: 16 shares ($5,475)

Net Sell 1 txn

Insider Mills Regan

Role President, Product Test

Sold 16 shs ($5K)

Type	Security	Shares	Price	Value
Sale	Common Stock	16	$342.17	$5K

Holdings After Transaction: Common Stock — 11,399.345 shares (Direct)

Footnotes (1)

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Key Figures

Shares sold: 16 shares Sale price per share: $342.17 Shares owned after sale: 11,399.3452 shares +2 more

5 metrics

Shares sold 16 shares Open-market sale on April 8, 2026

Sale price per share $342.17 Teradyne common stock transaction on April 8, 2026

Shares owned after sale 11,399.3452 shares Direct ownership by Regan Mills following the trade

RSU vesting date April 1, 2026 Restricted stock units whose tax withholding was corrected

10b5-1 plan adoption date November 25, 2025 Sales plan governing the April 8, 2026 transaction

Key Terms

restricted stock units, Rule 10b5-1, sales plan, tax withholding obligations

4 terms

restricted stock units financial

"tax withholding obligations in connection with the vesting of restricted stock units on April 1, 2026"

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.

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 financial

"pursuant to a sales plan adopted by the Reporting Person on November 25, 2025"

tax withholding obligations financial

"shares withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations"

Form 4 Insider Transactions: What Each Field Means →

04/09/2026 - 12:08 PM

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^*

Mills Regan

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/08/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/08/2026		S⁽¹⁾		16	D	$342.17	11,399.3452	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Following an administrative correction to the number of shares withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units on April 1, 2026, as reported on a Form 4 filed on April 3, 2026, an additional 16 shares were sold on April 8, 2026 pursuant to a sales plan adopted by the Reporting Person on November 25, 2025 and intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934.

	/s/ Ryan E. Driscoll, Attorney-in-Fact	04/09/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did Teradyne (TER) executive Regan Mills report in this Form 4?

Regan Mills reported selling 16 shares of Teradyne common stock. The sale occurred on April 8, 2026 at $342.17 per share and was a very small transaction relative to Mills’ remaining direct ownership of 11,399.3452 shares after the trade.

At what price and on what date were Teradyne (TER) shares sold by Regan Mills?

Regan Mills sold Teradyne common stock on April 8, 2026 at $342.17 per share. This was an open-market transaction and involved only 16 shares, as disclosed in the Form 4 insider trading report filed for the executive.

How many Teradyne (TER) shares does Regan Mills own after this transaction?

After the transaction, Regan Mills directly owns 11,399.3452 shares of Teradyne common stock. The Form 4 explicitly lists this post-transaction figure, showing that the 16-share sale was very small compared with the executive’s remaining stake.

Was the Teradyne (TER) stock sale by Regan Mills made under a Rule 10b5-1 plan?

Yes. The footnote states the 16-share sale on April 8, 2026 was made under a sales plan adopted on November 25, 2025 and intended to comply with Rule 10b5-1, indicating it was pre-arranged rather than an opportunistic market-timing trade.

Why did Regan Mills sell 16 Teradyne (TER) shares according to the filing?

The footnote explains the additional 16 shares were sold after an administrative correction to shares previously withheld for tax obligations tied to restricted stock units that vested on April 1, 2026. The sale aligned the withholding with the correct tax amount.