MSFT 542.5 calls expiring Oct 12 (same day) traded 6.9x their open interest
As of , published from Oct 12, 2026, 09:58 ET. Source: Schwab options chain.
MSFT calls expiring that date in the strikes we track traded 1.8x their open interest, by 09:43 ET on Oct 12, 2026. Tracked: up to 40 strikes around the money across 23 expirations.
CStrike6.9x
Expiry1.8x
Evidence
The numbers behind this snapshot, Oct 12, 2026, 09:43 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
6.9x
Volume / prior open interest, the expiry's tracked strikes
1.8x
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: 1.76; Ratio: 6.9
Contracts traded behind each figure
Expiry calls: 31
Baseline
this expiry's call volume/open interest, same session: 1.76
Baseline window
same expiry, same session (n = strikes with open interest)
7,127 put and 1,790 call contracts by 15:12 ET on Oct 12, 2026. Est. premium $3.3M puts, $1.9M calls. Tracked: up to 40 strikes around the money across 23 expirations.
3,424 call and 1,043 put contracts by 11:57 ET on Oct 12, 2026. Est. premium $6.6M calls, $290K puts. Tracked: up to 40 strikes around the money across 23 expirations.
8,798 call and 501 put contracts by 11:48 ET on Oct 12, 2026. Est. premium $15.1M calls, $400K puts. Tracked: up to 40 strikes around the money across 23 expirations.
8,806 call and 3,479 put contracts by 10:17 ET on Oct 12, 2026. Est. premium $2.1M calls, $878K puts. Tracked: up to 40 strikes around the money across 23 expirations.
5,994 put and 2,207 call contracts by 10:08 ET on Oct 12, 2026. Est. premium $5.7M puts, $4.0M calls. Tracked: up to 40 strikes around the money across 23 expirations.