Teradyne Inc
Ownership
Ownership Structure
Who owns Teradyne Inc (TER)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.8% of the shares are freely tradable; institutional investors hold 96.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.43 | 19,437,021 | +19.2 | 06/30/2026 |
| Vanguard Capital Management, LLC | 6.54 | 10,225,398 | +0.5 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 5.52 | 8,633,782 | +0.4 | 06/30/2026 |
| State Street Corp | 4.66 | 7,290,460 | +4.6 | 06/30/2026 |
| Amvescap Plc. | 4.27 | 6,683,098 | +165.1 | 06/30/2026 |
| JPMorgan Chase & Co | 3.56 | 5,570,053 | +94.0 | 06/30/2026 |
| Geode Capital Management, LLC | 2.94 | 4,602,292 | +5.3 | 06/30/2026 |
| FMR Inc | 2.63 | 4,105,776 | +13.7 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.17 | 4,962,838 | -0.2 | 09/30/2026 |
| Vanguard 500 Index Investor | 2.63 | 4,104,531 | -1.3 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Smith Gregory Stephen | President and CEO | 104,495 | 26,228,347 $ | Oct 15, 2026 | direct |
| Tufano Paul J | Director | 66,008 | 16,568,008 $ | Sep 25, 2026 | direct |
| Herweck Peter | Director | 16,282 | 4,086,782 $ | Sep 25, 2026 | direct |
| Matz Marilyn | Director | 12,641 | 3,172,809 $ | Oct 21, 2026 | direct |
| Maddock Ernest E | Director | 10,269 | 2,577,519 $ | Sep 25, 2026 | direct |
| Johnson Mercedes | Director | 6,031 | 1,513,781 $ | Nov 2, 2026 | direct |
| Henry Andrew Chisholm | Director | 2,991 | 750,741 $ | Sep 24, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 2, 2026 | Johnson Mercedes | Director | Sell | 166 | 275.44 | 45,723 |
| Oct 21, 2026 | Matz Marilyn | Director | Sell | 400 | 350.00 | 140,000 |
| Oct 15, 2026 | Smith Gregory Stephen | President and CEO | Sell | 4,000 | 341.28 | 1,365,120 |
| Oct 15, 2026 | Matz Marilyn | Director | Sell | 800 | 341.28 | 273,024 |
| Oct 1, 2026 | Johnson Mercedes | Director | Sell | 167 | 402.90 | 67,284 |
| Sep 25, 2026 | Herweck Peter | Director | Other | 4 | 0.00 | – |
| Sep 25, 2026 | Tufano Paul J | Director | Other | 19 | 0.00 | – |
| Sep 25, 2026 | Maddock Ernest E | Director | Other | 2 | 0.00 | – |
| Sep 24, 2026 | Herweck Peter | Director | Other | 77 | 0.00 | – |
| Sep 24, 2026 | Tufano Paul J | Director | Other | 141 | 0.00 | – |
| Sep 24, 2026 | Henry Andrew Chisholm | Director | Other | 64 | 0.00 | – |
| Sep 17, 2026 | Matz Marilyn | Director | Sell | 400 | 351.11 | 140,444 |
| Sep 15, 2026 | Smith Gregory Stephen | President and CEO | Sell | 4,000 | 337.83 | 1,351,320 |
| Sep 15, 2026 | Matz Marilyn | Director | Sell | 800 | 337.83 | 270,264 |
| Sep 1, 2026 | Johnson Mercedes | Director | Sell | 167 | 341.30 | 56,997 |
| Aug 17, 2026 | Smith Gregory Stephen | President and CEO | Sell | 4,000 | 425.00 | 1,700,000 |
| Aug 17, 2026 | Matz Marilyn | Director | Sell | 1,200 | 425.00 | 510,000 |
| Aug 3, 2026 | Johnson Mercedes | Director | Sell | 166 | 358.15 | 59,453 |
| Jul 15, 2026 | Smith Gregory Stephen | President and CEO | Sell | 4,000 | 356.31 | 1,425,240 |
| Jul 15, 2026 | Matz Marilyn | Director | Sell | 1,200 | 356.31 | 427,572 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 4, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.