Pre-market price movements and significant market activity for DexCom, Inc. ($DXCM). Each move is flagged by Z-score statistical significance — showing when $DXCM moved beyond its typical daily range. 3 significant moves detected in the last 30 days.
Current Market State
What May Be Driving DXCM?
Dexcom's landmark CONNECT study published in NEJM redefining Type 2 diabetes care drove the stock up.
DexCom, Inc. operates in the Healthcare sector, specifically Surgical & Medical Instruments & Apparatus. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Oct 15, 2026 | Pre-market | $86.00 | +3.03% | 2.30 | 0.2× |
| Oct 6, 2026 | Regular | $83.02 | -4.46% | -4.04 | 0.4× |
| Oct 6, 2026 | After-hours | $83.75 | -3.62% | -3.29 | 0.8× |
About DXCM Premarket Movers
This page tracks unusual market activity for DexCom, Inc. (DXCM) across all trading sessions — pre-market (4:00 AM–9:30 AM ET), regular hours (9:30 AM–4:00 PM ET), and after-hours (4:00 PM–8:00 PM ET). A move is flagged as "unusual" when its Z-score reaches 2 or higher, meaning the price change is statistically significant relative to DXCM's recent daily volatility.
Z-score is calculated by comparing each move to the 20-day average return and standard deviation. A Z-score of 2.0 means the move is 2 standard deviations beyond the average — occurring in roughly the top 5% of daily moves. Relative volume (RVOL) compares current volume to the 20-day average volume at the same time of day, helping distinguish genuine institutional activity from noise.