DexCom, Inc.
DexCom, Inc. (DXCM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · DXCM · as of Sep 30, 2025
Ownership Breakdown
981
Institutional Holders
▼ 30 vs Q2
$24.55B
Total Inst. Value
▼ $7.40B vs Q2
385.87M
Shares Outstanding
freeFloat 99.62%
369.05M
13F Shares Held
▼ 1.24M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
DXCM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
TUDOR INVESTMENT CORP ET AL surgical & medical instruments & apparatus | 69.15M | 17.64% | 17.64% | $63.06B | Nov 14, 2025 | NEW |
VANGUARD GROUP INC surgical & medical instruments & apparatus | 49.46M | 12.61% | 12.61% | $3.33T | Nov 7, 2025 | ▲ 1.13M |
BLACKROCK, INC. surgical & medical instruments & apparatus | 38.82M | 9.90% | 9.90% | $2.61T | Nov 12, 2025 | ▼ 210.3K |
STATE STREET CORP surgical & medical instruments & apparatus | 16.86M | 4.30% | 4.30% | $1.13T | Nov 14, 2025 | ▼ 3.0K |
BAILLIE GIFFORD & CO surgical & medical instruments & apparatus | 15.88M | 4.05% | 4.05% | $1.07T | Oct 31, 2025 | ▼ 823.0K |
GEODE CAPITAL MANAGEMENT, LLC surgical & medical instruments & apparatus | 10.96M | 2.80% | 2.80% | $734.94B | Nov 12, 2025 | ▲ 197.4K |
JENNISON ASSOCIATES LLC surgical & medical instruments & apparatus | 10.09M | 2.57% | 2.57% | $678.98B | Oct 30, 2025 | ▼ 1.43M |
UBS ASSET MANAGEMENT AMERICAS INC surgical & medical instruments & apparatus | 7.48M | 1.91% | 1.91% | $503.50B | Nov 14, 2025 | ▼ 1.65M |
CITADEL ADVISORS LLC surgical & medical instruments & apparatus | 6.78M | 1.73% | 1.73% | $456.12B | Nov 14, 2025 | ▲ 5.41M |
NUVEEN, LLC surgical & medical instruments & apparatus | 6.34M | 1.62% | 1.62% | $426.85B | Nov 12, 2025 | ▼ 1.23M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+26.73M shares2
New Positions
first time holders24
Decreased
−22.40M shares0
Sold Out
fully exitedNet shares change (top 50)
+4.33M
+26.73M / −22.40M
Net new holders
+1
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
DXCM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
14
Buy transactions
15
Sell transactions
0.93
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Coleman Jon EVP, Chief Commercial Officer | Jun 3, 2026 | Sale | 4,912 | $73.00 | $358.6K | 100.4K | Form 4 ↗ |
Coleman Jon EVP, Chief Commercial Officer | Jun 4, 2026 | Sale | 4,911 | $74.13 | $364.1K | 95.5K | Form 4 ↗ |
ALTMAN STEVEN R director | May 28, 2026 | Award | 5,565 | — | — | 5.6K | Form 4 ↗ |
Malady Kyle director | May 28, 2026 | Award | 5,575 | — | — | 28.2K | Form 4 ↗ |
AUGUSTINOS NICHOLAS director | May 28, 2026 | Award | 5,575 | — | — | 5.6K | Form 4 ↗ |
FOLETTA MARK G director | May 28, 2026 | Award | 6,331 | — | — | 6.3K | Form 4 ↗ |
Heller Bridgette P director | May 28, 2026 | Award | 5,575 | — | — | 30.6K | Form 4 ↗ |
Osterloh Albert Frederick IV director | May 28, 2026 | Award | 1,630 | — | — | 8.7K | Form 4 ↗ |
Driscoll Rimma director | May 28, 2026 | Award | 5,605 | — | — | 17.3K | Form 4 ↗ |
Ashley Euan A. director | May 28, 2026 | Award | 5,565 | — | — | 12.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
DexCom, Inc. (DXCM) is primarily owned by institutional investors, who hold approximately 95.6% of total shares outstanding. Company insiders own approximately 0.38%, while retail and public investors account for the remaining 3.98%.
The largest institutional shareholder of DexCom, Inc. is TUDOR INVESTMENT CORP ET AL, holding approximately 69.15 million shares — equal to 17.64% of outstanding shares — as of September 30, 2025.
A total of 981 institutional investors currently hold DXCM stock, with a combined institutional value of approximately $24.55 billion as of the most recent 13F filing period.
Frequently asked questions
DXCM ownershipDexCom, Inc. (DXCM) is primarily owned by institutional investors, who hold approximately 95.6% of shares. The largest shareholder is TUDOR INVESTMENT CORP ET AL with a 17.64% stake. Company insiders hold 0.38%. Data sourced from SEC Form 13F as of September 30, 2025.