What the executives and directors of Dexcom actually did with their own shares, decoded from three years of SEC Form 4 filings.
The tape: three years of insider trades
Every marker sits at the exact price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the gray strip is routine flow (vestings, tax withholding, gifts) that headlines love to miscount as selling.
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
Skin in the game
Directly held shares as reported after each trade, indexed to 100 five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
Who holds what
| Insider | Role | Shares held | Buys 12 m | Sales 12 m |
|---|---|---|---|---|
| Leach Jacob Steven President, CEO, and Director | CEO | 458.5K | $1M | — |
| TOPOL ERIC | Director | 380.5K | — | — |
| SAYER KEVIN R Executive Chair | Officer | 329K | — | $5.9M |
| Sylvain Jereme M EVP, Chief Financal Officer | Officer | 151.8K | — | $358K |
| Stern Sadie EVP Chief People & Culture Off | Officer | 130.1K | — | $117K |
| Pacelli Steven Robert EVP Managing Director Dexcom V | Officer | 124.8K | — | — |
| Brown Michael Jon EVP Chief Legal Compliance Off | Officer | 104.7K | — | $614K |
| Coleman Jon EVP, Chief Commercial Officer | Officer | 95.5K | — | $723K |
| ALTMAN STEVEN R | Director | 69.2K | — | — |
| Lawver Teri L EVP Chief Commercial Officer | Officer | 66.6K | — | — |
| Regan Barry J. EVP Operations | Officer | 58.5K | — | — |
| FOLETTA MARK G | Director | 55.2K | — | $850K |
| Flynn Paul R EVP Global Revenue | Officer | 48.9K | — | — |
| Selvaraj Shelly Ramasamy SVP Chief Information Officer | Officer | 48.5K | — | — |
Open-market trade log
| Date | Insider | Type | Shares | Price | Value |
|---|---|---|---|---|---|
| 2026-08-03 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 2,000 | $85.32 | $171K |
| 2026-07-31 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 2,000 | $80.00 | $160K |
| 2026-07-20 | SAYER KEVIN R (Officer) | Planned sale (10b5-1) | 26.8K | $76.32 | $2M |
| 2026-07-15 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 1,700 | $74.42 | $127K |
| 2026-07-06 | SAYER KEVIN R (Officer) | Planned sale (10b5-1) | 26.8K | $72.00 | $1.9M |
| 2026-06-15 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 199 | $74.82 | $15K |
| 2026-06-15 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 3,801 | $74.10 | $282K |
| 2026-06-15 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 1,700 | $75.55 | $128K |
| 2026-06-04 | Coleman Jon (Officer) | Planned sale (10b5-1) | 4,911 | $74.13 | $364K |
| 2026-06-03 | Coleman Jon (Officer) | Planned sale (10b5-1) | 4,912 | $73.00 | $359K |
| 2026-05-21 | SAYER KEVIN R (Officer) | Planned sale (10b5-1) | 26.8K | $72.00 | $1.9M |
| 2026-05-15 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 1,700 | $59.91 | $102K |
| 2026-05-12 | Heller Bridgette P (Director) | Planned sale (10b5-1) | 1,012 | $60.01 | $61K |
| 2026-04-15 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 1,700 | $63.04 | $107K |
| 2026-03-16 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 1,700 | $64.85 | $110K |
| 2026-02-12 | Heller Bridgette P (Director) | Planned sale (10b5-1) | 1,012 | $68.01 | $69K |
| 2025-11-14 | Collins Richard Alexander (Director) | Planned sale (10b5-1) | 2,906 | $59.05 | $172K |
| 2025-11-12 | Heller Bridgette P (Director) | Planned sale (10b5-1) | 1,012 | $58.07 | $59K |
| 2025-11-10 | Leach Jacob Steven (COO) | Open-market buy | 2,500 | $55.43 | $139K |
| 2025-11-10 | Leach Jacob Steven (COO) | Open-market buy | 15.7K | $54.98 | $863K |
| 2025-11-10 | Collins Richard Alexander (Director) | Planned sale (10b5-1) | 3,948 | $55.17 | $218K |
| 2025-09-05 | Malady Kyle (Director) | Planned sale (10b5-1) | 667 | $80.86 | $54K |
| 2025-09-04 | Stern Sadie (Officer) | Planned sale (10b5-1) | 1,466 | $80.00 | $117K |
| 2025-09-02 | Sylvain Jereme M (Officer) | Planned sale (10b5-1) | 4,824 | $74.17 | $358K |
| 2025-08-15 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 195 | $81.54 | $16K |
| 2025-08-15 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 2,555 | $81.02 | $207K |
| 2025-08-15 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 500 | $80.29 | $40K |
| 2025-07-28 | Stern Sadie (Officer) | Planned sale (10b5-1) | 1,466 | $88.99 | $130K |
| 2025-07-15 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 8 | $86.03 | $688 |
| 2025-07-15 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 2,742 | $85.17 | $234K |
| 2025-07-15 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 500 | $86.03 | $43K |
| 2025-06-26 | Stern Sadie (Officer) | Planned sale (10b5-1) | 1,466 | $85.06 | $125K |
| 2025-06-16 | FOLETTA MARK G (Director) | Planned sale (10b5-1) | 2,750 | $83.13 | $229K |
| 2025-06-16 | AUGUSTINOS NICHOLAS (Director) | Planned sale (10b5-1) | 3,672 | $82.80 | $304K |
| 2025-06-16 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 500 | $82.80 | $41K |
| 2025-06-13 | AUGUSTINOS NICHOLAS (Director) | Planned sale (10b5-1) | 2,618 | $81.69 | $214K |
| 2025-05-27 | Stern Sadie (Officer) | Planned sale (10b5-1) | 6,184 | $85.11 | $526K |
| 2025-05-23 | Brown Michael Jon (Officer) | Planned sale (10b5-1) | 10K | $84.28 | $843K |
| 2025-03-17 | Heller Bridgette P (Director) | Planned sale (10b5-1) | 352 | $70.33 | $25K |
| 2025-03-12 | SAYER KEVIN R (CEO) | Discretionary sale | 32.5K | $70.38 | $2.3M |
| 2025-03-12 | Sylvain Jereme M (Officer) | Discretionary sale | 12K | $70.38 | $845K |
| 2025-03-12 | Leach Jacob Steven (COO) | Discretionary sale | 14.1K | $70.38 | $991K |
| 2025-03-12 | Stern Sadie (Officer) | Discretionary sale | 11.2K | $70.38 | $787K |
| 2025-03-12 | Brown Michael Jon (Officer) | Discretionary sale | 13K | $70.38 | $915K |
| 2025-03-10 | Sylvain Jereme M (Officer) | Planned sale (10b5-1) | 1,127 | $74.70 | $84K |
| 2025-03-10 | Sylvain Jereme M (Officer) | Planned sale (10b5-1) | 2,670 | $73.22 | $195K |
| 2025-03-10 | Sylvain Jereme M (Officer) | Planned sale (10b5-1) | 3,203 | $74.04 | $237K |
| 2025-01-29 | SAYER KEVIN R (CEO) | Discretionary sale | 33.4K | $86.91 | $2.9M |
| 2025-01-29 | Sylvain Jereme M (Officer) | Discretionary sale | 2,090 | $86.91 | $182K |
| 2025-01-29 | Leach Jacob Steven (COO) | Discretionary sale | 2,634 | $86.91 | $229K |
| 2025-01-29 | Stern Sadie (Officer) | Discretionary sale | 2,093 | $86.91 | $182K |
| 2025-01-29 | Dolan Matthew Vincent (Officer) | Discretionary sale | 1,183 | $86.91 | $103K |
| 2024-12-16 | Heller Bridgette P (Director) | Planned sale (10b5-1) | 1,000 | $76.87 | $77K |
| 2024-12-16 | Sylvain Jereme M (Officer) | Discretionary sale | 744 | $76.87 | $57K |
| 2024-12-16 | Leach Jacob Steven (COO) | Discretionary sale | 744 | $76.87 | $57K |
| 2024-12-16 | Stern Sadie (Officer) | Discretionary sale | 424 | $76.87 | $33K |
| 2024-11-20 | Stern Sadie (Officer) | Discretionary sale | 4,259 | $74.73 | $318K |
| 2024-11-15 | Sylvain Jereme M (Officer) | Planned sale (10b5-1) | 3,500 | $75.51 | $264K |
| 2024-09-16 | Heller Bridgette P (Director) | Planned sale (10b5-1) | 1,000 | $70.00 | $70K |
| 2024-09-09 | Sylvain Jereme M (Officer) | Discretionary sale | 746 | $69.15 | $52K |
“Since trade” compares with the latest insider-implied price, not a market quote; this site carries no market data by design.
Filing hygiene
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.