Northern Trust Corp. options tape
Read from CBOE's delayed chain on 23 September 2026, with Northern Trust Corp. at $173.57: open interest within 90 days was 3,866 call and 1,392 put contracts, a put/call ratio of 0.36; the day's volume was 26 calls and 434 puts (16.69). The most call open interest sits at the $145.00 strike (670 contracts) and the most put open interest at $165.00 (180). The at-the-money straddle for 16 October 2026, 23 days out, was priced at 5.4% of spot. For 16 October 2026, implied volatility was 28.6% at the put 5% below spot and 26.8% at the call 5% above, +1.8 points.
Where the open interest sits
| Side | Strike | Open interest |
|---|---|---|
| Calls | $145.00 | 670 |
| Puts | $165.00 | 180 |
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 |
|---|---|---|---|
| 16 October 2026 put at $165.00 | 217 | 77 | $36,348 |
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 NTRS, the free 15-minute-delayed chain, read once a day. Figures describe positioning; they are not a forecast.
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