DXCM DexCom, Inc.

NASDAQ
$80.35

DexCom, Inc. (DXCM) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal Moderately bearish Selling ran elevated versus DXCM's own trailing one-year pace, with 100% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 5 sellers in the last 90 days
Insiders buying
0
0 transactions
Insiders selling
5
12 transactions
Purchases
$0
0 shares
Sales
$4.5M
51,278 shares
Net activity
-$4.5M
purchases less sales

How much of that selling was preplanned? 100% planned / 0% discretionary

10b5-1 plan sales $4.5M 12 transactions · 51,278 shares
Discretionary sales $0 0 transactions · 0 shares

Largest single sale: $1.7M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: November 10, 2025 — 1.0 years ago, by Leach Jacob Steven .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Stern Sadie EVP Chief People & Culture Off Sell 10b5-1 2,565 $78.62 $201.7K 120,913 −2.1% of holding
Brown Michael Jon EVP Chief Legal Compliance Off Sell 10b5-1 1,700 $85.48 $145.3K 98,185 −1.7% of holding
Stern Sadie EVP Chief People & Culture Off Sell 10b5-1 2,565 $86.15 $221.0K 123,478 −2% of holding
AUGUSTINOS NICHOLAS Director Sell 10b5-1 6,539 $84.04 $549.5K 29,293 −18.2% of holding
Brown Michael Jon EVP Chief Legal Compliance Off Sell 10b5-1 1,700 $84.04 $142.9K 99,885 −1.7% of holding
AUGUSTINOS NICHOLAS Director Sell 10b5-1 1,550 $84.02 $130.2K 35,832 −4.1% of holding
Sylvain Jereme M EVP, Chief Financal Officer Sell 10b5-1 3,638 $83.27 $302.9K 146,828 −2.4% of holding
Stern Sadie EVP Chief People & Culture Off Sell 10b5-1 2,565 $88.37 $226.7K 126,043 −2% of holding
SAYER KEVIN R 3 fills Executive Chair Sell 10b5-1 26,756 $90.01 $2.4M 309,662 −8% of holding
Brown Michael Jon EVP Chief Legal Compliance Off Sell 10b5-1 1,700 $91.93 $156.3K 102,953 −1.6% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.