MSFT calls expiring that date in the strikes we track traded 1.3x their open interest, by 10:17 ET on Oct 21, 2026. Tracked: up to 40 strikes around the money across 22 expirations.
CStrike5.1x
Expiry1.3x
Evidence
The numbers behind this snapshot, Oct 21, 2026, 10:17 ET. Session volume from delayed options chain snapshots, published at least 15 minutes after capture. Totals cover the strikes captured around the money, not every listed strike. Not individual trades. Premium is an estimate: volume times the quote midpoint.
Measure
Value
Volume / prior open interest, this strike
5.1x
Volume / prior open interest, the expiry's tracked strikes
1.3x
Days to expiry
0
Why it fired
Rule
volume/prior OI >= 5.0 and >= 3.0 x this expiry's call volume/OI; prior OI >= 1000; volume >= 2000
Values that cleared it
Expiry ratio: 1.26; Ratio: 5.11
Contracts traded behind each figure
Expiry calls: 34
Baseline
this expiry's call volume/open interest, same session: 1.26
Baseline window
same expiry, same session (n = strikes with open interest)
The median is MSFT's call/put volume ratio for contracts 1 to 3 weeks out over the last 9 sessions. 25,038 call and 1,789 put contracts by 10:32 ET on Oct 21, 2026. Tracked: up to 40 strikes around the money across 22 expirations.
The median is MSFT's call/put volume ratio for contracts 1 to 3 months out over the last 9 sessions. 4,621 call and 735 put contracts by 09:58 ET on Oct 21, 2026. Tracked: up to 40 strikes around the money across 22 expirations.
Within 3 weeks: 25,802 put and 34,534 call contracts. 1 to 3 months out: 2,179 put and 7,243 call contracts. By 09:58 ET on Oct 21, 2026. Tracked: up to 40 strikes around the money across 22 expirations.
The median is MSFT's put/call volume ratio for contracts same day over the last 5 sessions. 6,387 put and 3,153 call contracts by 09:32 ET on Oct 21, 2026. Tracked: up to 40 strikes around the money across 22 expirations.