DXCM

DEXCOM INC

Name: DEXCOM INC insider trading (SEC Form 4) history
Creator: U.S. Securities and Exchange Commission

SEC CIK 1093557

$75.37 +6.4% · 90 days

90-day buys

0 open-market

90-day sells

$2.92M

6 open-market

Net insider flow

−$2.92M

Net selling

Filings shown

110

Most recent

At a glance

Over the last 90 days, insiders at DXCM have sold a net $2.92M of stock (0 open-market buys vs 6 sells).

Largest recent trade: Blackford Quentin S. sold $4.17M of DXCM, trimming their stake 20%.

Most active filer: Blackford Quentin S., with 45 transactions among the recent filings shown.

2 recent trades in DXCM were disclosed by members of the U.S. Senate under the STOCK Act — listed below.

Insider transaction history

Form 4 filings for DXCM, newest first

View on SEC EDGAR ↗

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Sep 11, 2019 ΔOwn −0.2%

Ace Heather S sold $16.5K of DXCM.

−$16.5K

106 sh @ $156

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Sep 11, 2019 ΔOwn −0.4%

Ace Heather S sold $37.5K of DXCM.

−$37.5K

240 sh @ $156

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Sep 11, 2019 ΔOwn −0.3%

Ace Heather S sold $25.2K of DXCM.

−$25.2K

160 sh @ $157

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Sep 11, 2019 ΔOwn −0.5%

Ace Heather S sold $44.3K of DXCM, trimming their stake 1%.

−$44.3K

280 sh @ $158

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Sep 11, 2019 ΔOwn −0.2%

Ace Heather S sold $18.6K of DXCM.

−$18.6K

116 sh @ $160

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Aug 26, 2019 ΔOwn −2.7%

Ace Heather S sold $314.3K of DXCM, trimming their stake 3%.

−$314.3K

1,800 sh @ $175

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Aug 26, 2019 ΔOwn −3.0%

Ace Heather S sold $335.5K of DXCM, trimming their stake 3%.

−$335.5K

1,914 sh @ $175

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Aug 26, 2019 ΔOwn −0.2%

Ace Heather S sold $17.6K of DXCM.

−$17.6K

100 sh @ $176

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Aug 26, 2019 ΔOwn −5.5%

Ace Heather S sold $598.7K of DXCM, trimming their stake 5%.

−$598.7K

3,429 sh @ $175

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Mar 13, 2019 ΔOwn −1.8%

Ace Heather S sold $184.6K of DXCM, trimming their stake 2%.

−$184.6K

1,293 sh @ $143

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Mar 13, 2019 ΔOwn −6.4%

Ace Heather S sold $642.6K of DXCM, trimming their stake 6%.

−$642.6K

4,500 sh @ $143

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Mar 13, 2019 ΔOwn −3.4%

Ace Heather S sold $376.6K of DXCM, trimming their stake 3%.

−$376.6K

2,641 sh @ $143

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Mar 13, 2019 ΔOwn −2.6%

Ace Heather S sold $276.6K of DXCM, trimming their stake 3%.

−$276.6K

1,927 sh @ $144

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Mar 13, 2019 ΔOwn −0.1%

Ace Heather S sold $14.4K of DXCM.

−$14.4K

100 sh @ $144

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Nov 13, 2018 ΔOwn −1.3%

Ace Heather S sold $131.3K of DXCM, trimming their stake 1%.

−$131.3K

900 sh @ $146

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Nov 13, 2018 ΔOwn −2.7%

Ace Heather S sold $273.5K of DXCM, trimming their stake 3%.

−$273.5K

1,858 sh @ $147

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Nov 13, 2018 ΔOwn −1.5%

Ace Heather S sold $147.9K of DXCM, trimming their stake 2%.

−$147.9K

1,000 sh @ $148

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Nov 13, 2018 ΔOwn −0.6%

Ace Heather S sold $59.7K of DXCM, trimming their stake 1%.

−$59.7K

400 sh @ $149

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Nov 13, 2018 ΔOwn −0.2%

Ace Heather S sold $15K of DXCM.

−$15K

100 sh @ $150

DXCM

DEXCOM INC

Sell ACE HEATHER S · SVP Human Resources · Open-market sale · filed Sep 12, 2018 ΔOwn −2.6%

Ace Heather S sold $263.4K of DXCM, trimming their stake 3%.

−$263.4K

1,832 sh @ $144

Congress trading in DXCM

Disclosed by U.S. Senators under the STOCK Act

All Congress trades →

May 7, 2026 Tina Smith Sale (Full) $100,001 - $250,000

Apr 29, 2026 Tina Smith Sale (Partial) $100,001 - $250,000

About DXCM insider activity

This page tracks every recent Form 4 filed for DEXCOM INC with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is DXCM insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for DEXCOM INC usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.