DexCom Inc
Ownership
Ownership Structure
Who owns DexCom Inc (DXCM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.6% of the shares are freely tradable; institutional investors hold 102.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 10.33 | 38,964,371 | -2.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.63 | 25,020,961 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.09 | 19,219,953 | +0.0 | 03/31/2026 |
| State Street Corp | 4.75 | 17,934,847 | -0.9 | 03/31/2026 |
| Baillie Gifford & Co Limited. | 3.92 | 14,801,590 | -5.1 | 06/30/2026 |
| Amvescap Plc. | 3.62 | 13,672,314 | -2.9 | 03/31/2026 |
| AllianceBernstein L.P. | 3.42 | 12,923,644 | +49.9 | 03/31/2026 |
| Geode Capital Management, LLC | 3.27 | 12,346,638 | +12.2 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.26 | 12,288,244 | +0.3 | 07/31/2026 |
| Vanguard 500 Index Investor | 2.68 | 10,130,758 | +1.1 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Leach Jacob Steven | President, CEO, and Director | 418,908 | 37,450,375 $ | Aug 22, 2026 | direct |
| Sayer Kevin R | Executive Chair | 302,214 | 27,017,932 $ | Aug 20, 2026 | direct |
| Sylvain Jereme M | EVP, Chief Financal Officer | 146,828 | 13,126,423 $ | Sep 10, 2026 | direct |
| Stern Sadie | EVP Chief People & Culture Off | 126,043 | 11,268,244 $ | Aug 27, 2026 | direct |
| Brown Michael Jon | EVP Chief Legal Compliance Off | 99,885 | 8,929,719 $ | Sep 15, 2026 | direct |
| Foletta Mark G | Director | 48,852 | 4,367,369 $ | Aug 3, 2026 | indirect |
| Heller Bridgette P | Director | 29,570 | 2,643,558 $ | Aug 12, 2026 | direct |
| Augustinos Nicholas | Director | 29,293 | 2,618,794 $ | Sep 15, 2026 | indirect |
| Boehnlein Glenn S | Director | 5,841 | 522,185 $ | Sep 10, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 15, 2026 | Augustinos Nicholas | Director | Sell | 6,539 | 84.04 | 549,538 |
| Sep 15, 2026 | Brown Michael Jon | EVP Chief Legal Compliance Off | Sell | 1,700 | 84.04 | 142,868 |
| Sep 14, 2026 | Augustinos Nicholas | Director | Sell | 1,550 | 84.02 | 130,231 |
| Sep 10, 2026 | Sylvain Jereme M | EVP, Chief Financal Officer | Sell | 3,638 | 83.27 | 302,936 |
| Sep 10, 2026 | Boehnlein Glenn S | Director | Other | 5,841 | 0.00 | – |
| Aug 27, 2026 | Stern Sadie | EVP Chief People & Culture Off | Sell | 2,565 | 88.37 | 226,669 |
| Aug 22, 2026 | Leach Jacob Steven | President, CEO, and Director | Other | 1,451 | 92.34 | 133,985 |
| Aug 22, 2026 | Sylvain Jereme M | EVP, Chief Financal Officer | Other | 1,451 | 92.34 | 133,985 |
| Aug 22, 2026 | Brown Michael Jon | EVP Chief Legal Compliance Off | Other | 1,451 | 92.34 | 133,985 |
| Aug 22, 2026 | Stern Sadie | EVP Chief People & Culture Off | Other | 1,451 | 92.34 | 133,985 |
| Aug 20, 2026 | Sayer Kevin R | Executive Chair | Sell | 97 | 91.41 | 8,867 |
| Aug 20, 2026 | Sayer Kevin R | Executive Chair | Sell | 7,351 | 90.78 | 667,332 |
| Aug 20, 2026 | Sayer Kevin R | Executive Chair | Sell | 19,308 | 89.71 | 1,732,043 |
| Aug 14, 2026 | Brown Michael Jon | EVP Chief Legal Compliance Off | Sell | 1,700 | 91.93 | 156,281 |
| Aug 12, 2026 | Heller Bridgette P | Director | Sell | 1,012 | 88.29 | 89,349 |
| Aug 12, 2026 | Augustinos Nicholas | Director | Other | 1,075 | 0.00 | – |
| Aug 3, 2026 | Foletta Mark G | Director | Sell | 2,000 | 85.32 | 170,640 |
| Jul 31, 2026 | Foletta Mark G | Director | Sell | 2,000 | 80.00 | 160,000 |
| Jul 20, 2026 | Sayer Kevin R | Executive Chair | Sell | 26,756 | 76.32 | 2,041,999 |
| Jul 15, 2026 | Brown Michael Jon | EVP Chief Legal Compliance Off | Sell | 1,700 | 74.42 | 126,514 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.