Latest filingSep 14, 2026Most recent Form 4
DXCM
DEXCOM INC
NasdaqHealthcareSurgical & Medical Instruments & Apparatus
Insider activity for last month from 08/14 to 09/14. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$309M6 sells
Net open-market-$309M5 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period7transactions
- S · Open-market sells · dominant6 · 86%
- A · Grants / awards1 · 14%
Activity by reported role
A joint filing can contribute to multiple roles9transactions
- CHAIR · dominant3 · 33%
- Chief financial officer1 · 11%
- CO1 · 11%
- Director1 · 11%
- ECLCO1 · 11%
- ECP1 · 11%
- EVP1 · 11%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeSayer Kevin RCommon Stock · Direct
302,311Aug 20, 2026
Brown Michael JonCommon Stock · Direct
102,953Aug 14, 2026
Stern SadieCommon Stock · Direct
126,043Aug 27, 2026
Boehnlein Glenn SCommon Stock · Direct
5,841Sep 10, 2026
Sylvain Jereme MCommon Stock · Direct
146,828Sep 10, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 14 → Sep 14
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Top insiders
By absolute net value across the selected period- SR-$2.4M
- SM-$302.9k
- BJ-$156.3k
- BS+$0
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
DXCM transaction history
Filters apply within this company and selected period by defaultLatest insider transactions
Form 4 filings from last month. Click any column to sort; click it again to flip the order.
| ID | Ticker | Insider | Role | Type | Shares | Value | Code | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|
| #214292 | DXCM | Sylvain Jereme M | EVPCFO | sale10b5-1 | 3.63k | -$30.2M | S | 09/14 | 09/10 |
| #208654 | DXCM | Boehnlein Glenn S | DIR | grant | 5.84k | $0 | A | 09/10 | 09/10 |
| #83430 | DXCM | Sayer Kevin R | CHAIR | sale10b5-1 | 97 | -$886k | S | 08/24 | 08/20 |
| #83429 | DXCM | Sayer Kevin R | CHAIR | sale10b5-1 | 7.35k | -$66.7M | S | 08/24 | 08/20 |
| #83428 | DXCM | Sayer Kevin R | CHAIR | sale10b5-1 | 19.3k | -$173M | S | 08/24 | 08/20 |
| #365 | DXCM | Brown Michael Jon | ECLCO | sale10b5-1 | 1.70k | -$15.6M | S | 08/17 | 08/14 |
DEXCOM INC Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at DEXCOM INC?
Sylvain Jereme M, Boehnlein Glenn S, Stern Sadie, SAYER KEVIN R, Brown Michael Jon.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Sylvain Jereme M reported a sale on Sep 10, 2026 valued at $30.2M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $3,094,128.40. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.