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.
DEXCOM INC (DXCM): Insider Trades and Fund Holdings
In the past 12 months, DEXCOM INC insiders reported no open-market purchases and 10 sales worth $4.37M; 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 27, 2026Planned saleSADIE STERN (officer) filed notice to sell about $201,660 around Oct 27, 2026
- Oct 15, 2026Insider saleGeneral Counsel Michael Jon Brown sold $145,316 under a 10b5-1 plan
- Oct 15, 2026Planned saleMICHAEL BROWN (officer) filed notice to sell about $145,316 around Oct 15, 2026
- Sep 28, 2026Insider saleEVP Sadie Stern sold $220,975 under a 10b5-1 plan
- Sep 28, 2026Planned saleSADIE STERN (officer) filed notice to sell about $220,975 around Sep 28, 2026
- Sep 15, 2026Insider saleDirector Nicholas Augustinos sold $549,538 under a 10b5-1 plan (1 days after: executive or director change)
- Sep 15, 2026Insider saleGeneral Counsel Michael Jon Brown sold $142,868 under a 10b5-1 plan (1 days after: executive or director change)
- Sep 15, 2026Planned saleAUGUSTINOS NICHOLAS (director) filed notice to sell about $549,538 around Sep 15, 2026
- Sep 15, 2026Planned saleMICHAEL BROWN (officer) filed notice to sell about $142,868 around Sep 15, 2026
- Sep 14, 2026NewsCompany reported: Executive or director change
- Sep 14, 2026Insider saleDirector Nicholas Augustinos sold $130,231 under a 10b5-1 plan (0 days after: executive or director change)
- Sep 14, 2026Planned saleAUGUSTINOS NICHOLAS (director) filed notice to sell about $130,231 around Sep 14, 2026
- Sep 10, 2026NewsCompany reported: Executive or director change
- Sep 10, 2026Insider saleEVP Jereme M. Sylvain sold $302,936 under a 10b5-1 plan (0 days after: executive or director change)
- Sep 10, 2026Planned saleJEREME SYLVAIN (officer) filed notice to sell about $302,936 around Sep 10, 2026
- Aug 27, 2026Insider saleEVP Sadie Stern sold $226,669 under a 10b5-1 plan
- Aug 27, 2026Planned saleSADIE STERN (officer) filed notice to sell about $226,669 around Aug 27, 2026
- Aug 20, 2026Insider saleExecutive Chair Kevin R. Sayer sold $2.4 million under a 10b5-1 plan
- Aug 20, 2026Planned saleKEVIN R SAYER (officer, director) filed notice to sell about $2.4 million around Aug 20, 2026
- Aug 14, 2026Insider saleGeneral Counsel Michael Jon Brown sold $156,281 under a 10b5-1 plan
- Aug 12, 2026Insider saleDirector Bridgette P. Heller sold $89,349 under a 10b5-1 plan
- Jun 30, 2026FundBridgewater Associates added 187% in Q2 2026 (13F filed Aug 14, 2026)
- Jun 30, 2026FundRenaissance Technologies added 3% 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 19, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| Oct 19 | Michael Jon BrownGeneral Counsel | ▼ SELL10b5-1 | $145K |
| Sep 30 | Sadie SternEVP | ▼ SELL10b5-1 | $221K |
| Sep 16 | Nicholas AugustinosDirector | ▼ SELL10b5-1 | $550K |
| Sep 16 | Michael Jon BrownGeneral Counsel | ▼ SELL10b5-1 | $143K |
| Sep 16 | Nicholas AugustinosDirector | ▼ SELL10b5-1 | $130K |
| Sep 14 | Jereme M. SylvainEVP | ▼ SELL10b5-1 | $303K |
| Aug 28 | Sadie SternEVP | ▼ SELL10b5-1 | $227K |
| Aug 24 | Kevin R. SayerExecutive Chair | ▼ SELL10b5-1 | $2.41M |
| Aug 17 | Michael Jon BrownGeneral Counsel | ▼ SELL10b5-1 | $156K |
| Aug 13 | Bridgette P. HellerDirector | ▼ SELL10b5-1 | $89K |
Insiders who traded in the past year
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Michael Jon Brown | General Counsel | 0 | $0 | 3 | $444K |
| Sadie Stern | EVP | 0 | $0 | 2 | $448K |
| Nicholas Augustinos | Director | 0 | $0 | 2 | $680K |
| Jereme M. Sylvain | EVP | 0 | $0 | 1 | $303K |
| Kevin R. Sayer | Executive Chair | 0 | $0 | 1 | $2.41M |
| Bridgette P. Heller | Director | 0 | $0 | 1 | $89K |
Buybacks and executive pay
DEXCOM INC spent $500 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 DXCM
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Renaissance Technologies | 1,630,796 | $109.8M | ▲ +3.0% |
| Bridgewater Associates | 400,929 | $27.0M | ▲ +187.0% |
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 →