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DexCom stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+36.9% to $79.41
DexCom (DXCM) stock rose 37% over the last 252 sessions, to $79.41. On the way it reported 4 quarters, its insiders filed no open-market trades (10b5-1 plan sales aside) and 16 Form 144 notices of planned sales, and the company filed 5 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 29, 2026 | Earnings | Earnings: beat the EPS estimate by 8.3% | +1.7% (+2.0% vs SPY) | +11.8% (+12.5% vs SPY) | — |
| Oct 27, 2026 | Form 144 | Form 144: Sadie Stern plans to sell $202K | 0.0% (−0.6% vs SPY) | +7.6% (+9.3% vs SPY) | — |
| Oct 15, 2026 | Form 144 | Form 144: Michael Brown plans to sell $145K | +5.0% (+4.7% vs SPY) | −3.9% (−4.4% vs SPY) | — |
| Sep 28, 2026 | Form 144 | Form 144: Sadie Stern plans to sell $221K | +0.1% (+0.8% vs SPY) | −1.5% (−1.2% vs SPY) | −9.8% (−9.0% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: Michael Brown plans to sell $143K | +2.1% (+2.5% vs SPY) | +5.2% (+3.3% vs SPY) | +0.4% (−2.0% vs SPY) |
| Sep 15, 2026 | Form 144 | Form 144: Nicholas Augustinos plans to sell $550K | +2.1% (+2.5% vs SPY) | +5.2% (+3.3% vs SPY) | +0.4% (−2.0% vs SPY) |
| Sep 14, 2026 | 8-K | Directors and officers: departures, appointments, pay | +2.1% (+2.5% vs SPY) | +5.2% (+3.3% vs SPY) | +0.4% (−2.0% vs SPY) |
| Sep 14, 2026 | Form 144 | Form 144: Nicholas Augustinos plans to sell $130K | +2.0% (+2.4% vs SPY) | +7.3% (+7.4% vs SPY) | +3.4% (+1.4% vs SPY) |
| Sep 10, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.8% (−2.6% vs SPY) | +4.0% (+3.3% vs SPY) | −0.5% (−3.4% vs SPY) |
| Sep 10, 2026 | Form 144 | Form 144: Jereme Sylvain plans to sell $303K | +0.7% (+1.3% vs SPY) | +4.0% (+5.1% vs SPY) | +0.6% (−1.1% vs SPY) |
| Aug 27, 2026 | Form 144 | Form 144: Sadie Stern plans to sell $227K | +0.4% (−0.3% vs SPY) | +0.8% (+0.9% vs SPY) | −2.7% (−3.6% vs SPY) |
| Aug 20, 2026 | Form 144 | Form 144: Kevin R Sayer plans to sell $2.4M | +0.4% (+1.2% vs SPY) | −1.0% (−0.7% vs SPY) | −0.6% (+0.1% vs SPY) |
| Aug 14, 2026 | Form 144 | Form 144: Michael Brown plans to sell $156K | −1.9% (−1.7% vs SPY) | −1.4% (+0.6% vs SPY) | −7.7% (−5.5% vs SPY) |
| Aug 12, 2026 | Form 144 | Form 144: Bridgette P. Heller plans to sell $89K | +1.4% (+1.2% vs SPY) | +0.1% (+0.5% vs SPY) | −5.8% (−4.1% vs SPY) |
| Aug 3, 2026 | Form 144 | Form 144: Mark G Foletta plans to sell $171K | +4.5% (+3.1% vs SPY) | +1.5% (−1.9% vs SPY) | +8.7% (+6.1% vs SPY) |
| Jul 31, 2026 | Form 144 | Form 144: Mark G Foletta plans to sell $160K | +11.3% (+10.6% vs SPY) | +10.8% (+7.2% vs SPY) | +19.7% (+16.1% vs SPY) |
| Jul 30, 2026 | Earnings | Earnings: beat the EPS estimate by 15.1% | −0.8% (−2.5% vs SPY) | +9.5% (+4.2% vs SPY) | +17.2% (+11.7% vs SPY) |
| Jul 20, 2026 | Form 144 | Form 144: Kevin R Sayer plans to sell $2.0M | −1.3% (−1.1% vs SPY) | −6.9% (−6.3% vs SPY) | +14.7% (+10.8% vs SPY) |
| Jul 15, 2026 | Form 144 | Form 144: Michael Brown plans to sell $127K | −1.9% (−2.3% vs SPY) | +0.9% (+1.3% vs SPY) | +20.3% (+17.6% vs SPY) |
| Jul 6, 2026 | Form 144 | Form 144: Kevin R Sayer plans to sell $1.9M | +1.6% (+0.7% vs SPY) | +5.1% (+3.7% vs SPY) | +20.3% (+18.6% vs SPY) |
| Apr 30, 2026 | Earnings | Earnings: beat the EPS estimate by 19.0% | +3.4% (+2.4% vs SPY) | +4.7% (+1.7% vs SPY) | +24.8% (+18.7% vs SPY) |
| Mar 2, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.0% (−0.1% vs SPY) | −7.1% (−5.9% vs SPY) | −16.1% (−11.0% vs SPY) |
| Feb 26, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.3% (−0.8% vs SPY) | −5.1% (−3.9% vs SPY) | −17.8% (−9.7% vs SPY) |
| Feb 12, 2026 | Earnings | Earnings: beat the EPS estimate by 4.5% | −4.6% (−3.0% vs SPY) | +5.9% (+7.0% vs SPY) | −5.9% (−1.5% vs SPY) |
| Dec 22, 2025 | 8-K | Directors and officers: departures, appointments, pay | −0.9% (−1.3% vs SPY) | −0.6% (−0.9% vs SPY) | +7.8% (+7.1% vs SPY) |
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Report card: every quarter against the estimate → DexCom: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.