BlackRock Reports 10.1% Stake in Teradyne

Teradyne Inc. Schedule 13G/A reports that BlackRock, Inc. beneficially owns 15,850,543 shares of Teradyne common stock, representing 10.1% of the class as of 05/31/2026.

Rhea-AI Filing Summary

Teradyne Inc. Schedule 13G/A reports that BlackRock, Inc. beneficially owns 15,850,543 shares of Teradyne common stock, representing 10.1% of the class as of 05/31/2026. The filing attributes 14,784,600 shares of sole voting power and 15,850,543 shares of sole dispositive power to BlackRock's Reporting Business Units. The amendment is signed on 06/04/2026.

Insights

Institutional Ownership Analyst

BlackRock holds a double-digit stake in Teradyne (10.1%).

BlackRock, through its Reporting Business Units, is shown as beneficial owner of 15,850,543 shares (10.1%). The filing lists voting and dispositive powers separately, with 14,784,600 shares of sole voting power and 15,850,543 shares of sole dispositive power.

Holdings at this scale can influence shareholder dynamics; subsequent amendments or proxy disclosures may clarify whether these holdings translate into coordinated voting intentions or board engagement.

Securities Compliance Attorney

This is a routine 13G/A amendment disclosing beneficial ownership details.

The schedule follows Release No. 34-39538 guidance and attributes ownership to Reporting Business Units of BlackRock, noting that other business units are excluded. The filing includes required Exhibit references (Exhibit 24 and Exhibit 99) and is signed by a Managing Director.

Regulatory implications are procedural: this disclosure updates public records of beneficial ownership and preserves compliance with reporting thresholds.

Key Figures

Beneficial ownership: 15,850,543 shares Percent of class: 10.1% Sole voting power: 14,784,600 shares +3 more

6 metrics

Beneficial ownership 15,850,543 shares Amount beneficially owned reported in Item 4

Percent of class 10.1% Percent of common stock reported in Item 4

Sole voting power 14,784,600 shares Sole power to vote reported in Item 4(i)

Sole dispositive power 15,850,543 shares Sole power to dispose reported in Item 4(iii)

Reporting date 05/31/2026 Cover page date for the Schedule 13G/A

Signature date 06/04/2026 Date signature by Managing Director Spencer Fleming

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 14 ) TERADYNE INC Common Stock"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 15850543"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Item 4. | (iii) Sole power to dispose or to direct the disposition of: 15850543"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

FAQ

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

What stake does BlackRock report in TER?

BlackRock reports beneficial ownership of 15,850,543 shares, equal to 10.1% of Teradyne's common stock as of 05/31/2026. The filing attributes sole dispositive power over the full 15,850,543 shares to BlackRock's Reporting Business Units.

Who at BlackRock signed the Schedule 13G/A for TER?

The amendment is signed by Spencer Fleming, Managing Director, with signature dated 06/04/2026. The form lists BlackRock, Inc.'s principal office at 50 Hudson Yards, New York, NY for filing and contact context.

How much voting power does BlackRock have in Teradyne?

BlackRock reports 14,784,600 shares as its sole power to vote or to direct the vote. The Schedule 13G/A separates voting power (14,784,600) from dispositive power (15,850,543) in its Item 4 disclosure.

Does the filing indicate others control these shares for BlackRock?

The filing states various persons may have rights to dividends or proceeds, but no single outside person holds more than 5% of Teradyne. Ownership is reported on behalf of Reporting Business Units, per SEC Release No. 34-39538.

Is this Schedule 13G/A a purchase or sale filing for TER shares?

This Schedule 13G/A is a disclosure of beneficial ownership, not a transactional report. It lists aggregate holdings (15,850,543 shares, 10.1%) and voting/dispositive powers; it does not report specific buy or sell transactions in this excerpt.

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

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Accepted by SEC EDGAR 06/04/2026 - 12:12 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 14)

TERADYNE INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

880770102

(CUSIP Number)

05/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 880770102

1

Names of Reporting Persons

BlackRock, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 14,784,600.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 15,850,543.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

15,850,543.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

10.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: TERADYNE INC
(b)	Address of issuer's principal executive offices: 600 RIVERPARK DRIVE NORTH READING MA 01864
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 880770102
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 15850543
(b)	Percent of class: 10.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 14784600
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 15850543
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of TERADYNE INC. No one person's interest in the common stock of TERADYNE INC is more than five percent of the total outstanding common shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	06/04/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7