Teradyne Inc (TER) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 2, 2026.
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- Filings shown
- 14
- Open-market buys
- 0
- Open-market sells
- 10
Counts cover the 14 most recent Form 4 filings Tradune holds for TER (filed Jul 16 – Oct 2, 2026); the score below covers only the trailing 90 days (0 buys, 8 sells). No completed check of TER's Form 4 list on SEC EDGAR is on record yet; the latest TER filing Tradune holds was filed Oct 2, 2026. This is not guaranteed to be the complete record — see TER's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 12 filings Tradune holds for TER filed Aug 4 – Oct 2, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
8 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 8 sales· 10,900 sh
- checkbox disclosed
- On filings with the box not checked
- 0 sales· 0 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Marilyn MatzDirector | 0 | 3 | — | 2,400 | −$920,708 |
| Mercedes JohnsonDirector | 0 | 3 | — | 500 | −$183,734 |
| Gregory Stephen SmithPresident and CEO | 0 | 2 | — | 8,000 | −$3,051,320 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at TER
No open-market insider purchases (Form 4 code P) were reported for TER between Jul 16, 2026 and Oct 2, 2026. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 167 | $402.90 | 6,197 | −2.6% | Oct 1, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Other acquisition / disposition | 4 | — | 16,282 | +0.0% | Sep 25, 2026 |
| Grant / award | 77 | — | 16,278 | +0.5% | Sep 24, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Other acquisition / disposition | 19 | — | 66,008 | +0.0% | Sep 25, 2026 |
| Grant / award | 141 | — | 65,989 | +0.2% | Sep 24, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Other acquisition / disposition | 2 | — | 10,269 | +0.0% | Sep 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 64 | — | 2,991 | +2.2% | Sep 24, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 400 | $351.11 | 13,841 | −2.8% | Sep 17, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 4,000 | $337.83 | 108,495 | −3.6% | Sep 15, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 800 | $337.83 | 14,241 | −5.3% | Sep 15, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 167 | $341.30 | 6,364 | −2.6% | Sep 1, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 4,000 | $425.00 | 112,495 | −3.4% | Aug 17, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,200 | $425.00 | 15,041 | −7.4% | Aug 17, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 166 | $358.15 | 6,531 | −2.5% | Aug 3, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 4,000 | $356.31 | 116,495 | −3.3% | Jul 15, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,200 | $356.31 | 16,241 | −6.9% | Jul 15, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to TER's (Oct 2, 2026).
Frequently asked about TER insider activity
How many insiders bought TER stock in these Form 4 filings?
No open-market purchases (Form 4 code P) of TER shares were reported by Teradyne Inc insiders between Jul 16, 2026 and Oct 2, 2026. The 14 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for TER?
The most recent Form 4 on this page was filed by Mercedes Johnson (Director) on Oct 2, 2026, reporting 1 transaction. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market TER insider sale shown?
The largest open-market sale among the filings shown was 4,000 TER shares at $425.00 (about $1,700,000) by Gregory Stephen Smith (President and CEO) on Aug 17, 2026. Value is shares × the price reported on the Form 4; that Form 4 has the Rule 10b5-1 box checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track TER insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.