DexCom Inc (DXCM) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Sep 30, 2026.
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- Filings shown
- 17
- Open-market buys
- 0
- Open-market sells
- 15
Counts cover the 17 most recent Form 4 filings Tradune holds for DXCM (filed Jul 16 – Sep 30, 2026); the score below covers only the trailing 90 days (0 buys, 13 sells). No completed check of DXCM's Form 4 list on SEC EDGAR is on record yet; the latest DXCM filing Tradune holds was filed Sep 30, 2026. This is not guaranteed to be the complete record — see DXCM's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 15 filings Tradune holds for DXCM filed Aug 4 – Sep 30, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
13 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 13 sales· 52,025 sh
- checkbox disclosed
- On filings with the box not checked
- 0 sales· 0 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Kevin R. SayerExecutive Chair | 0 | 3 | — | 26,756 | −$2,408,242 |
| Nicholas AugustinosDirector | 0 | 2 | — | 8,089 | −$679,769 |
| Sadie SternEVP Chief People & Culture Off | 0 | 2 | — | 5,130 | −$447,644 |
| Mark G. FolettaDirector | 0 | 2 | — | 4,000 | −$330,640 |
| Michael Jon BrownEVP Chief Legal Compliance Off | 0 | 2 | — | 3,400 | −$299,149 |
| Jereme M. SylvainEVP, Chief Financal Officer | 0 | 1 | — | 3,638 | −$302,936 |
| Bridgette P. HellerDirector | 0 | 1 | — | 1,012 | −$89,349 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at DXCM
No open-market insider purchases (Form 4 code P) were reported for DXCM between Jul 16, 2026 and Sep 30, 2026. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 2,565 | $86.15 | 123,478 | −2.0% | Sep 28, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 6,539 | $84.04 | 29,293 (indirect) | −18% | Sep 15, 2026 |
| Open-market sale 10b5-1 box checked | 1,550 | $84.02 | 35,832 (indirect) | −4.1% | Sep 14, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,700 | $84.04 | 99,885 | −1.7% | Sep 15, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 3,638 | $83.27 | 146,828 | −2.4% | Sep 10, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award | 5,841 | — | 5,841 | — | Sep 10, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 2,565 | $88.37 | 126,043 | −2.0% | Aug 27, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 1,451 | $92.34 | 418,908 | −0.3% | Aug 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 1,451 | $92.34 | 150,390 | −1.0% | Aug 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 1,451 | $92.34 | 101,502 | −1.4% | Aug 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 1,451 | $92.34 | 128,608 | −1.1% | Aug 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 19,308 | $89.71 | 309,662 | −5.9% | Aug 20, 2026 |
| Open-market sale 10b5-1 box checked | 7,351 | $90.78 | 302,311 | −2.4% | Aug 20, 2026 |
| Open-market sale 10b5-1 box checked | 97 | $91.41 | 302,214 | −0.0% | Aug 20, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,700 | $91.93 | 102,953 | −1.6% | Aug 14, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,012 | $88.29 | 29,570 | −3.3% | Aug 12, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Gift | 1,075 | — | 37,382 (indirect) | −2.8% | Aug 12, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 2,000 | $85.32 | 48,852 (indirect) | −3.9% | Aug 3, 2026 |
| Open-market sale 10b5-1 box checked | 2,000 | $80.00 | 50,852 (indirect) | −3.8% | Jul 31, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 26,756 | $76.32 | 328,970 | −7.5% | Jul 20, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,700 | $74.42 | 104,653 | −1.6% | Jul 15, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to DXCM's (Sep 30, 2026).
Frequently asked about DXCM insider activity
How many insiders bought DXCM stock in these Form 4 filings?
No open-market purchases (Form 4 code P) of DXCM shares were reported by DexCom Inc insiders between Jul 16, 2026 and Sep 30, 2026. The 17 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for DXCM?
The most recent Form 4 on this page was filed by Sadie Stern (EVP Chief People & Culture Off) on Sep 30, 2026, reporting 1 transaction. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market DXCM insider sale shown?
The largest open-market sale among the filings shown was 26,756 DXCM shares at $76.32 (about $2,041,999) by Kevin R. Sayer (Executive Chair) on Jul 20, 2026. Value is shares × the price reported on the Form 4; that Form 4 has the Rule 10b5-1 box checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track DXCM insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.