Dexcom insider activity
What the executives and directors of Dexcom actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$11M
net open-market flow, 12 m
2 open-market buys, 12 m
100%
of sale value on 10b5-1 plans, 12 m
315 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the 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 grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
The 88 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Sep 10, 2026 | Boehnlein Glenn S | 5,841 |
| Aug 22, 2026 | Sylvain Jereme M | 1,451 |
| Aug 22, 2026 | Leach Jacob Steven | 1,451 |
| Aug 22, 2026 | Stern Sadie | 1,451 |
| Aug 22, 2026 | Brown Michael Jon | 1,451 |
| Aug 12, 2026 | AUGUSTINOS NICHOLAS | 1,075 |
| May 28, 2026 | ALTMAN STEVEN R | 5,565 |
| May 28, 2026 | FOLETTA MARK G | 6,331 |
| May 28, 2026 | AUGUSTINOS NICHOLAS | 5,575 |
| May 28, 2026 | Heller Bridgette P | 5,575 |
| May 28, 2026 | GALA RENEE D | 5,605 |
| May 28, 2026 | Collins Richard Alexander | 5,605 |
| May 28, 2026 | Malady Kyle | 5,575 |
| May 28, 2026 | Driscoll Rimma | 5,605 |
| May 28, 2026 | Ashley Euan A. | 5,565 |
| May 28, 2026 | Osterloh Albert Frederick IV | 1,630 |
| May 22, 2026 | Coleman Jon | 7,362 |
| May 22, 2026 | Sylvain Jereme M | 1,451 |
| May 22, 2026 | Leach Jacob Steven | 1,451 |
| May 22, 2026 | Stern Sadie | 1,451 |
| May 22, 2026 | Brown Michael Jon | 1,451 |
| May 8, 2026 | ALTMAN STEVEN R | 10K |
| May 8, 2026 | FOLETTA MARK G | 11K |
| May 8, 2026 | AUGUSTINOS NICHOLAS | 10K |
| May 8, 2026 | Collins Richard Alexander | 10K |
| Mar 8, 2026 | SAYER KEVIN R | 65K |
| Mar 8, 2026 | Coleman Jon | 44K |
| Mar 8, 2026 | Sylvain Jereme M | 68K |
| Mar 8, 2026 | Leach Jacob Steven | 124K |
| Mar 8, 2026 | Stern Sadie | 56K |
| Mar 8, 2026 | Brown Michael Jon | 62K |
| Feb 26, 2026 | Osterloh Albert Frederick IV | 7,061 |
| Jan 29, 2026 | SAYER KEVIN R | 105K |
| Jan 29, 2026 | Sylvain Jereme M | 9,775 |
| Jan 29, 2026 | Leach Jacob Steven | 11K |
| Jan 29, 2026 | Stern Sadie | 9,779 |
| Jan 29, 2026 | Brown Michael Jon | 9,776 |
| Oct 24, 2025 | Ashley Euan A. | 7,166 |
| May 22, 2025 | Coleman Jon | 69K |
| May 8, 2025 | ALTMAN STEVEN R | 10K |
| May 8, 2025 | FOLETTA MARK G | 12K |
| May 8, 2025 | AUGUSTINOS NICHOLAS | 10K |
| May 8, 2025 | TOPOL ERIC | 5,236 |
| May 8, 2025 | Heller Bridgette P | 5,046 |
| May 8, 2025 | Dahut Karen M | 5,226 |
| May 8, 2025 | GALA RENEE D | 6,235 |
| May 8, 2025 | Collins Richard Alexander | 10K |
| May 8, 2025 | Malady Kyle | 5,192 |
| May 8, 2025 | Driscoll Rimma | 5,074 |
| Mar 8, 2025 | SAYER KEVIN R | 85K |
| Mar 8, 2025 | Sylvain Jereme M | 59K |
| Mar 8, 2025 | Leach Jacob Steven | 59K |
| Mar 8, 2025 | Stern Sadie | 53K |
| Mar 8, 2025 | Brown Michael Jon | 53K |
| Mar 6, 2025 | GALA RENEE D | 5,720 |
| Jan 28, 2025 | SAYER KEVIN R | 69K |
| Jan 28, 2025 | Sylvain Jereme M | 5,586 |
| Jan 28, 2025 | Leach Jacob Steven | 7,107 |
| Jan 28, 2025 | Stern Sadie | 5,586 |
| Jan 28, 2025 | Dolan Matthew Vincent | 3,048 |
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.
The chart, in numbers
| Flow | Shares |
|---|---|
| Granted | 482K |
| Bought on market | 18K |
| Withheld for tax | 176K |
| Planned sales (10b5-1) | 162K |
| Gifts | 22K |
| Kept | 140K |
Who holds what
the 14 largest holdings of 26| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| Leach Jacob Steven President, CEO, and Director Last trade Nov 10, 2025 | CEO | 457K | $1.0M | – | net buying over the year: 1 month buying, 0 months selling | Nov 10, 2025 |
| TOPOL ERIC Last trade Jun 12, 2018 | Director | 381K | – | – | Jun 12, 2018 | |
| SAYER KEVIN R Executive Chair Last trade Aug 20, 2026 | Officer | 310K | – | $8.3M | net selling over the year: 0 months buying, 3 months selling | Aug 20, 2026 |
| Sylvain Jereme M EVP, Chief Financal Officer Last trade Sep 10, 2026 | Officer | 147K | – | $303K | net selling over the year: 0 months buying, 1 month selling | Sep 10, 2026 |
| Stern Sadie EVP Chief People & Culture Off Last trade Aug 27, 2026 | Officer | 126K | – | $227K | net selling over the year: 0 months buying, 1 month selling | Aug 27, 2026 |
| Pacelli Steven Robert EVP Managing Director Dexcom V Last trade Nov 24, 2023 | Officer | 125K | – | – | Nov 24, 2023 | |
| Brown Michael Jon EVP Chief Legal Compliance Off Last trade Sep 15, 2026 | Officer | 100K | – | $873K | net selling over the year: 0 months buying, 7 months selling | Sep 15, 2026 |
| Coleman Jon EVP, Chief Commercial Officer Last trade Jun 4, 2026 | Officer | 95K | – | $723K | net selling over the year: 0 months buying, 1 month selling | Jun 4, 2026 |
| ALTMAN STEVEN R Last trade Jan 16, 2024 | Director | 69K | – | – | Jan 16, 2024 | |
| Lawver Teri L EVP Chief Commercial Officer Last trade Mar 12, 2024 | Officer | 67K | – | – | Mar 12, 2024 | |
| Regan Barry J. EVP Operations Last trade Nov 8, 2023 | Officer | 58K | – | – | Nov 8, 2023 | |
| FOLETTA MARK G Last trade Aug 3, 2026 | Director | 55K | – | $627K | net selling over the year: 0 months buying, 3 months selling | Aug 3, 2026 |
| Flynn Paul R EVP Global Revenue Last trade Apr 17, 2023 | Officer | 49K | – | – | Apr 17, 2023 | |
| Naganathan Girish EVP Chief Technology Officer Last trade Nov 9, 2023 | Officer | 48K | – | – | Nov 9, 2023 |
Open-market trade log
the 60 most recent of 2,257| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Sep 15, 2026 | AUGUSTINOS NICHOLAS (Director) 6,539 shares $84.04 +0.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 6,539 | $84.04 | $550K | +0.0% | Sep 16, 2026 |
| Sep 15, 2026 | Brown Michael Jon (Officer) 1,700 shares $84.04 +0.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,700 | $84.04 | $143K | +0.0% | Sep 16, 2026 |
| Sep 14, 2026 | AUGUSTINOS NICHOLAS (Director) 1,550 shares $84.02 +0.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 1,550 | $84.02 | $130K | +0.0% | Sep 16, 2026 |
| Sep 10, 2026 | Sylvain Jereme M (Officer) 3,638 shares $83.27 +0.9% since trade filed Sep 14, 2026 | Planned sale (10b5-1) | 3,638 | $83.27 | $303K | +0.9% | Sep 14, 2026 |
| Aug 27, 2026 | Stern Sadie (Officer) 2,565 shares $88.37 −4.9% since trade filed Aug 28, 2026 | Planned sale (10b5-1) | 2,565 | $88.37 | $227K | −4.9% | Aug 28, 2026 |
| Aug 20, 2026 | SAYER KEVIN R (Officer) 97 shares $91.41 −8.1% since trade filed Aug 24, 2026 | Planned sale (10b5-1) | 97 | $91.41 | $9K | −8.1% | Aug 24, 2026 |
| Aug 20, 2026 | SAYER KEVIN R (Officer) 7,351 shares $90.78 −7.4% since trade filed Aug 24, 2026 | Planned sale (10b5-1) | 7,351 | $90.78 | $667K | −7.4% | Aug 24, 2026 |
| Aug 20, 2026 | SAYER KEVIN R (Officer) 19K shares $89.71 −6.3% since trade filed Aug 24, 2026 | Planned sale (10b5-1) | 19K | $89.71 | $1.7M | −6.3% | Aug 24, 2026 |
| Aug 14, 2026 | Brown Michael Jon (Officer) 1,700 shares $91.93 −8.6% since trade filed Aug 17, 2026 | Planned sale (10b5-1) | 1,700 | $91.93 | $156K | −8.6% | Aug 17, 2026 |
| Aug 12, 2026 | Heller Bridgette P (Director) 1,012 shares $88.29 −4.8% since trade filed Aug 13, 2026 | Planned sale (10b5-1) | 1,012 | $88.29 | $89K | −4.8% | Aug 13, 2026 |
| Aug 3, 2026 | FOLETTA MARK G (Director) 2,000 shares $85.32 −1.5% since trade filed Aug 4, 2026 | Planned sale (10b5-1) | 2,000 | $85.32 | $171K | −1.5% | Aug 4, 2026 |
| Jul 31, 2026 | FOLETTA MARK G (Director) 2,000 shares $80.00 +5.1% since trade filed Aug 4, 2026 | Planned sale (10b5-1) | 2,000 | $80.00 | $160K | +5.1% | Aug 4, 2026 |
| Jul 20, 2026 | SAYER KEVIN R (Officer) 27K shares $76.32 +10.1% since trade filed Jul 21, 2026 | Planned sale (10b5-1) | 27K | $76.32 | $2.0M | +10.1% | Jul 21, 2026 |
| Jul 15, 2026 | Brown Michael Jon (Officer) 1,700 shares $74.42 +12.9% since trade filed Jul 16, 2026 | Planned sale (10b5-1) | 1,700 | $74.42 | $127K | +12.9% | Jul 16, 2026 |
| Jul 6, 2026 | SAYER KEVIN R (Officer) 27K shares $72.00 +16.7% since trade filed Jul 7, 2026 | Planned sale (10b5-1) | 27K | $72.00 | $1.9M | +16.7% | Jul 7, 2026 |
| Jun 15, 2026 | FOLETTA MARK G (Director) 199 shares $74.82 +12.3% since trade filed Jun 17, 2026 | Planned sale (10b5-1) | 199 | $74.82 | $15K | +12.3% | Jun 17, 2026 |
| Jun 15, 2026 | FOLETTA MARK G (Director) 3,801 shares $74.10 +13.4% since trade filed Jun 17, 2026 | Planned sale (10b5-1) | 3,801 | $74.10 | $282K | +13.4% | Jun 17, 2026 |
| Jun 15, 2026 | Brown Michael Jon (Officer) 1,700 shares $75.55 +11.2% since trade filed Jun 17, 2026 | Planned sale (10b5-1) | 1,700 | $75.55 | $128K | +11.2% | Jun 17, 2026 |
| Jun 4, 2026 | Coleman Jon (Officer) 4,911 shares $74.13 +13.4% since trade filed Jun 5, 2026 | Planned sale (10b5-1) | 4,911 | $74.13 | $364K | +13.4% | Jun 5, 2026 |
| Jun 3, 2026 | Coleman Jon (Officer) 4,912 shares $73.00 +15.1% since trade filed Jun 5, 2026 | Planned sale (10b5-1) | 4,912 | $73.00 | $359K | +15.1% | Jun 5, 2026 |
| May 21, 2026 | SAYER KEVIN R (Officer) 27K shares $72.00 +16.7% since trade filed May 26, 2026 | Planned sale (10b5-1) | 27K | $72.00 | $1.9M | +16.7% | May 26, 2026 |
| May 15, 2026 | Brown Michael Jon (Officer) 1,700 shares $59.91 +40.3% since trade filed May 19, 2026 | Planned sale (10b5-1) | 1,700 | $59.91 | $102K | +40.3% | May 19, 2026 |
| May 12, 2026 | Heller Bridgette P (Director) 1,012 shares $60.01 +40.0% since trade filed May 14, 2026 | Planned sale (10b5-1) | 1,012 | $60.01 | $61K | +40.0% | May 14, 2026 |
| Apr 15, 2026 | Brown Michael Jon (Officer) 1,700 shares $63.04 +33.3% since trade filed Apr 16, 2026 | Planned sale (10b5-1) | 1,700 | $63.04 | $107K | +33.3% | Apr 16, 2026 |
| Mar 16, 2026 | Brown Michael Jon (Officer) 1,700 shares $64.85 +29.6% since trade filed Mar 18, 2026 | Planned sale (10b5-1) | 1,700 | $64.85 | $110K | +29.6% | Mar 18, 2026 |
| Feb 12, 2026 | Heller Bridgette P (Director) 1,012 shares $68.01 +23.6% since trade filed Feb 17, 2026 | Planned sale (10b5-1) | 1,012 | $68.01 | $69K | +23.6% | Feb 17, 2026 |
| Nov 14, 2025 | Collins Richard Alexander (Director) 2,906 shares $59.05 +42.3% since trade filed Nov 17, 2025 | Planned sale (10b5-1) | 2,906 | $59.05 | $172K | +42.3% | Nov 17, 2025 |
| Nov 12, 2025 | Heller Bridgette P (Director) 1,012 shares $58.07 +44.7% since trade filed Nov 12, 2025 | Planned sale (10b5-1) | 1,012 | $58.07 | $59K | +44.7% | Nov 12, 2025 |
| Nov 10, 2025 | Leach Jacob Steven (COO) 2,500 shares $55.43 +51.6% since trade filed Nov 10, 2025 | Open-market buy | 2,500 | $55.43 | $139K | +51.6% | Nov 10, 2025 |
| Nov 10, 2025 | Leach Jacob Steven (COO) 16K shares $54.98 +52.9% since trade filed Nov 10, 2025 | Open-market buy | 16K | $54.98 | $863K | +52.9% | Nov 10, 2025 |
| Nov 10, 2025 | Collins Richard Alexander (Director) 3,948 shares $55.17 +52.3% since trade filed Nov 10, 2025 | Planned sale (10b5-1) | 3,948 | $55.17 | $218K | +52.3% | Nov 10, 2025 |
| Sep 5, 2025 | Malady Kyle (Director) 667 shares $80.86 +3.9% since trade filed Sep 9, 2025 | Planned sale (10b5-1) | 667 | $80.86 | $54K | +3.9% | Sep 9, 2025 |
| Sep 4, 2025 | Stern Sadie (Officer) 1,466 shares $80.00 +5.1% since trade filed Sep 8, 2025 | Planned sale (10b5-1) | 1,466 | $80.00 | $117K | +5.1% | Sep 8, 2025 |
| Sep 2, 2025 | Sylvain Jereme M (Officer) 4,824 shares $74.17 +13.3% since trade filed Sep 4, 2025 | Planned sale (10b5-1) | 4,824 | $74.17 | $358K | +13.3% | Sep 4, 2025 |
| Aug 15, 2025 | FOLETTA MARK G (Director) 195 shares $81.54 +3.1% since trade filed Aug 18, 2025 | Planned sale (10b5-1) | 195 | $81.54 | $16K | +3.1% | Aug 18, 2025 |
| Aug 15, 2025 | FOLETTA MARK G (Director) 2,555 shares $81.02 +3.7% since trade filed Aug 18, 2025 | Planned sale (10b5-1) | 2,555 | $81.02 | $207K | +3.7% | Aug 18, 2025 |
| Aug 15, 2025 | Brown Michael Jon (Officer) 500 shares $80.29 +4.7% since trade filed Aug 18, 2025 | Planned sale (10b5-1) | 500 | $80.29 | $40K | +4.7% | Aug 18, 2025 |
| Jul 28, 2025 | Stern Sadie (Officer) 1,466 shares $88.99 −5.6% since trade filed Jul 29, 2025 | Planned sale (10b5-1) | 1,466 | $88.99 | $130K | −5.6% | Jul 29, 2025 |
| Jul 15, 2025 | FOLETTA MARK G (Director) 8 shares $86.03 −2.3% since trade filed Jul 17, 2025 | Planned sale (10b5-1) | 8 | $86.03 | $688 | −2.3% | Jul 17, 2025 |
| Jul 15, 2025 | FOLETTA MARK G (Director) 2,742 shares $85.17 −1.3% since trade filed Jul 17, 2025 | Planned sale (10b5-1) | 2,742 | $85.17 | $234K | −1.3% | Jul 17, 2025 |
| Jul 15, 2025 | Brown Michael Jon (Officer) 500 shares $86.03 −2.3% since trade filed Jul 17, 2025 | Planned sale (10b5-1) | 500 | $86.03 | $43K | −2.3% | Jul 17, 2025 |
| Jun 26, 2025 | Stern Sadie (Officer) 1,466 shares $85.06 −1.2% since trade filed Jun 30, 2025 | Planned sale (10b5-1) | 1,466 | $85.06 | $125K | −1.2% | Jun 30, 2025 |
| Jun 16, 2025 | FOLETTA MARK G (Director) 2,750 shares $83.13 +1.1% since trade filed Jun 18, 2025 | Planned sale (10b5-1) | 2,750 | $83.13 | $229K | +1.1% | Jun 18, 2025 |
| Jun 16, 2025 | AUGUSTINOS NICHOLAS (Director) 3,672 shares $82.80 +1.5% since trade filed Jun 17, 2025 | Planned sale (10b5-1) | 3,672 | $82.80 | $304K | +1.5% | Jun 17, 2025 |
| Jun 16, 2025 | Brown Michael Jon (Officer) 500 shares $82.80 +1.5% since trade filed Jun 18, 2025 | Planned sale (10b5-1) | 500 | $82.80 | $41K | +1.5% | Jun 18, 2025 |
| Jun 13, 2025 | AUGUSTINOS NICHOLAS (Director) 2,618 shares $81.69 +2.9% since trade filed Jun 17, 2025 | Planned sale (10b5-1) | 2,618 | $81.69 | $214K | +2.9% | Jun 17, 2025 |
| May 27, 2025 | Stern Sadie (Officer) 6,184 shares $85.11 −1.3% since trade filed May 28, 2025 | Planned sale (10b5-1) | 6,184 | $85.11 | $526K | −1.3% | May 28, 2025 |
| May 23, 2025 | Brown Michael Jon (Officer) 10K shares $84.28 −0.3% since trade filed May 28, 2025 | Planned sale (10b5-1) | 10K | $84.28 | $843K | −0.3% | May 28, 2025 |
| Mar 17, 2025 | Heller Bridgette P (Director) 352 shares $70.33 +19.5% since trade filed Mar 19, 2025 | Planned sale (10b5-1) | 352 | $70.33 | $25K | +19.5% | Mar 19, 2025 |
| Mar 12, 2025 | SAYER KEVIN R (CEO) 32K shares $70.38 +19.4% since trade filed Mar 14, 2025 | Discretionary sale | 32K | $70.38 | $2.3M | +19.4% | Mar 14, 2025 |
| Mar 12, 2025 | Sylvain Jereme M (Officer) 12K shares $70.38 +19.4% since trade filed Mar 14, 2025 | Discretionary sale | 12K | $70.38 | $845K | +19.4% | Mar 14, 2025 |
| Mar 12, 2025 | Leach Jacob Steven (COO) 14K shares $70.38 +19.4% since trade filed Mar 14, 2025 | Discretionary sale | 14K | $70.38 | $991K | +19.4% | Mar 14, 2025 |
| Mar 12, 2025 | Stern Sadie (Officer) 11K shares $70.38 +19.4% since trade filed Mar 14, 2025 | Discretionary sale | 11K | $70.38 | $787K | +19.4% | Mar 14, 2025 |
| Mar 12, 2025 | Brown Michael Jon (Officer) 13K shares $70.38 +19.4% since trade filed Mar 14, 2025 | Discretionary sale | 13K | $70.38 | $915K | +19.4% | Mar 14, 2025 |
| Mar 10, 2025 | Sylvain Jereme M (Officer) 1,127 shares $74.70 +12.5% since trade filed Mar 11, 2025 | Planned sale (10b5-1) | 1,127 | $74.70 | $84K | +12.5% | Mar 11, 2025 |
| Mar 10, 2025 | Sylvain Jereme M (Officer) 2,670 shares $73.22 +14.8% since trade filed Mar 11, 2025 | Planned sale (10b5-1) | 2,670 | $73.22 | $195K | +14.8% | Mar 11, 2025 |
| Mar 10, 2025 | Sylvain Jereme M (Officer) 3,203 shares $74.04 +13.5% since trade filed Mar 11, 2025 | Planned sale (10b5-1) | 3,203 | $74.04 | $237K | +13.5% | Mar 11, 2025 |
| Jan 29, 2025 | SAYER KEVIN R (CEO) 33K shares $86.91 −3.3% since trade filed Jan 30, 2025 | Discretionary sale | 33K | $86.91 | $2.9M | −3.3% | Jan 30, 2025 |
| Jan 29, 2025 | Sylvain Jereme M (Officer) 2,090 shares $86.91 −3.3% since trade filed Jan 30, 2025 | Discretionary sale | 2,090 | $86.91 | $182K | −3.3% | Jan 30, 2025 |
| Jan 29, 2025 | Leach Jacob Steven (COO) 2,634 shares $86.91 −3.3% since trade filed Jan 30, 2025 | Discretionary sale | 2,634 | $86.91 | $229K | −3.3% | Jan 30, 2025 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
193 Forms 4, 3 years
1 filed late
1 amendments
1.7 avg. days to file
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.