Bank of Montreal options tape
Read from CBOE's delayed chain on 26 September 2026, with Bank of Montreal at $172.30: open interest within 90 days was 5,956 call and 4,329 put contracts, a put/call ratio of 0.73; the day's volume was 288 calls and 231 puts (0.8). The most call open interest sits at the $195.00 strike (1,582 contracts) and the most put open interest at $180.00 (1,309). The at-the-money straddle for 16 October 2026, 20 days out, was priced at 4.1% of spot. For 16 October 2026, implied volatility was 23.3% at the put 5% below spot and 18.4% at the call 5% above, +4.8 points.
Where the open interest sits
| Side | Strike | Open interest |
|---|---|---|
| Calls | $195.00 | 1,582 |
| Puts | $180.00 | 1,309 |
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 |
|---|---|---|---|
| 18 December 2026 put at $175.00 | 226 | 102 | $200,010 |
| 18 December 2026 call at $175.00 | 226 | 40 | $144,640 |
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.
Open-interest builds against the previous day appear from the second daily read of this name.
Source
CBOE delayed quotes for BMO, the free 15-minute-delayed chain, read once a day. Figures describe positioning; they are not a forecast.
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