Microsoft Corp. options tape
Read from CBOE's delayed chain on 23 September 2026, with Microsoft Corp. at $501.48: open interest within 90 days was 1,357,312 call and 581,992 put contracts, a put/call ratio of 0.43; the day's volume was 413,589 calls and 140,065 puts (0.34). The most call open interest sits at the $575.00 strike (137,387 contracts) and the most put open interest at $500.00 (28,569). The at-the-money straddle for 25 September 2026, 2 days out, was priced at 2.1% of spot. For 16 October 2026, implied volatility was 26.0% at the put 5% below spot and 24.2% at the call 5% above, +1.7 points.
Where the open interest sits
| Side | Strike | Open interest |
|---|---|---|
| Calls | $575.00 | 137,387 |
| Puts | $500.00 | 28,569 |
The strike with the most open interest on each side, across expiries within 90 days.
Strikes where the day's volume was at least twice the open interest
| Contract | Volume | Open interest before | Premium traded |
|---|---|---|---|
| 25 September 2026 call at $500.00 | 12,334 | 4,214 | $5.1 million |
| 25 September 2026 call at $505.00 | 8,389 | 3,439 | $2.0 million |
| 25 September 2026 call at $507.50 | 10,638 | 3,337 | $1.8 million |
| 25 September 2026 call at $510.00 | 14,046 | 5,135 | $1.8 million |
| 25 September 2026 call at $497.50 | 3,163 | 1,475 | $1.7 million |
| 16 October 2026 put at $472.50 | 2,846 | 18 | $1.1 million |
| 2 October 2026 call at $497.50 | 945 | 308 | $855,225 |
| 28 September 2026 call at $500.00 | 1,606 | 408 | $819,060 |
Volume of at least 200 contracts and at least twice the open interest, with at least $25,000 of premium at the mid; contracts expiring the same day are left out. Premium is mid price times volume times 100.
Source
CBOE delayed quotes for MSFT, the free 15-minute-delayed chain, read once a day. Figures describe positioning; they are not a forecast.
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