About this page
Insider trades reported on SEC Form 4: when the people who run a company buy or sell its shares with their own money.
How to read it
- Form 4
- The form a company insider (officer, director or owner of more than 10%) must file with the SEC within two business days of buying or selling the company's shares.
- Buy (P) and Sell (S)
- Open-market purchases and sales. Gifts, option exercises and automatic tax withholding are left out because they say little about what the insider thinks.
- Value
- Shares times price, as reported on the filing.
- 10b5-1
- A trade made under a plan set up in advance. Planned sales are common and usually say less than an unplanned purchase.
- Late filing
- A Form 4 filed more than two business days after the trade.
- Vs. S&P 500
- How the stock did after the trade minus how the overall market did in the same weeks.
A real example
In January 2016, when bank stocks were falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares with his own money, worth about $26 million. His Form 4 made the purchase public within days, and investors read it as a strong sign of confidence.
Explain it like I'm 13
If the coach of a team bets his own allowance that his team will win, that tells you something. A Form 4 is the note a company boss must hand in whenever he buys or sells his own company's shares, so everyone can see it.
Data from public SEC filings and congressional reports. Information, not investment advice. Check every number against the filing linked on the page.
TERADYNE, INC (TER): Insider Trades and Fund Holdings
In the past 12 months, TERADYNE, INC insiders reported no open-market purchases and 10 sales worth $5.87M; 10 of the sales were reported as made under a 10b5-1 trading plan.
Timeline: news and trades
Company filings (8-K), insider trades, notices of planned sales (Form 144) and fund moves in the past year, newest first.
- Oct 21, 2026Insider saleDirector Marilyn Matz sold $140,000 under a 10b5-1 plan
- Oct 21, 2026Planned saleMATZ MARILYN (director) filed notice to sell about $140,000 around Oct 21, 2026
- Oct 15, 2026Insider saleCEO Gregory Stephen Smith sold $1.4 million under a 10b5-1 plan
- Oct 15, 2026Insider saleDirector Marilyn Matz sold $273,024 under a 10b5-1 plan
- Oct 15, 2026Planned saleSmith Gregory Stephen (officer, director) filed notice to sell about $1.4 million around Oct 15, 2026
- Oct 15, 2026Planned saleMATZ MARILYN (director) filed notice to sell about $273,024 around Oct 15, 2026
- Oct 1, 2026Insider saleDirector Mercedes Johnson sold $67,284 under a 10b5-1 plan
- Oct 1, 2026Planned saleJOHNSON MERCEDES (director) filed notice to sell about $67,284 around Oct 1, 2026
- Sep 17, 2026Insider saleDirector Marilyn Matz sold $140,444 under a 10b5-1 plan
- Sep 17, 2026Planned saleMATZ MARILYN (director) filed notice to sell about $140,444 around Sep 17, 2026
- Sep 15, 2026Insider saleCEO Gregory Stephen Smith sold $1.4 million under a 10b5-1 plan
- Sep 15, 2026Insider saleDirector Marilyn Matz sold $270,264 under a 10b5-1 plan
- Sep 15, 2026Planned saleSmith Gregory Stephen (officer, director) filed notice to sell about $1.4 million around Sep 15, 2026
- Sep 15, 2026Planned saleMATZ MARILYN (director) filed notice to sell about $270,264 around Sep 15, 2026
- Sep 1, 2026Insider saleDirector Mercedes Johnson sold $56,997 under a 10b5-1 plan
- Sep 1, 2026Planned saleJOHNSON MERCEDES (director) filed notice to sell about $56,997 around Sep 1, 2026
- Aug 17, 2026Insider saleCEO Gregory Stephen Smith sold $1.7 million under a 10b5-1 plan
- Aug 17, 2026Insider saleDirector Marilyn Matz sold $510,000 under a 10b5-1 plan
- Aug 17, 2026Planned saleSmith Gregory Stephen (officer, director) filed notice to sell about $1.7 million around Aug 17, 2026
- Aug 17, 2026Planned saleMATZ MARILYN (director) filed notice to sell about $510,000 around Aug 17, 2026
- Jun 30, 2026FundBridgewater Associates cut 71% in Q2 2026 (13F filed Aug 14, 2026)
- Jun 30, 2026FundLone Pine Capital cut 20% in Q2 2026 (13F filed Aug 14, 2026)
- Jun 30, 2026FundRenaissance Technologies added 32% in Q2 2026 (13F filed Aug 13, 2026)
Recent insider trades
Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Oct 22, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| Oct 22 | Marilyn MatzDirector | ▼ SELL10b5-1 | $140K |
| Oct 19 | Gregory Stephen SmithCEO | ▼ SELL10b5-1 | $1.37M |
| Oct 19 | Marilyn MatzDirector | ▼ SELL10b5-1 | $273K |
| Oct 2 | Mercedes JohnsonDirector | ▼ SELL10b5-1 | $67K |
| Sep 18 | Marilyn MatzDirector | ▼ SELL10b5-1 | $140K |
| Sep 16 | Gregory Stephen SmithCEO | ▼ SELL10b5-1 | $1.35M |
| Sep 16 | Marilyn MatzDirector | ▼ SELL10b5-1 | $270K |
| Sep 2 | Mercedes JohnsonDirector | ▼ SELL10b5-1 | $57K |
| Aug 18 | Gregory Stephen SmithCEO | ▼ SELL10b5-1 | $1.70M |
| Aug 18 | Marilyn MatzDirector | ▼ SELL10b5-1 | $510K |
Insiders who traded in the past year
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Marilyn Matz | Director | 0 | $0 | 5 | $1.33M |
| Gregory Stephen Smith | CEO | 0 | $0 | 3 | $4.42M |
| Mercedes Johnson | Director | 0 | $0 | 2 | $124K |
Buybacks and executive pay
TERADYNE, INC spent $702.1 million buying back its own shares in 2025.
From the company's XBRL data filed with the SEC. "Actually paid" is the SEC's pay-versus-performance measure, which counts changes in the value of stock awards. "Value of $100 invested" is the company's cumulative shareholder return as reported, usually measured from five years earlier. See all buybacks and CEO pay across companies.
A All 10 insider trades reported on time. How it is graded
Tracked funds that report TER
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Lone Pine Capital | 1,493,080 | $722.4M | ▼ −20.3% |
| Renaissance Technologies | 218,100 | $105.5M | ▲ +32.3% |
| Bridgewater Associates | 98,627 | $47.7M | ▼ −70.9% |
Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →