Citigroup Inc. options tape
Read from CBOE's delayed chain on 23 September 2026, with Citigroup Inc. at $132.60: open interest within 90 days was 153,343 call and 240,038 put contracts, a put/call ratio of 1.57; the day's volume was 24,214 calls and 21,152 puts (0.87). The most call open interest sits at the $150.00 strike (18,907 contracts) and the most put open interest at $120.00 (39,627). The at-the-money straddle for 25 September 2026, 2 days out, was priced at 2.4% of spot. For 16 October 2026, implied volatility was 34.0% at the put 5% below spot and 33.9% at the call 5% above, +0.1 points.
Where the open interest sits
| Side | Strike | Open interest |
|---|---|---|
| Calls | $150.00 | 18,907 |
| Puts | $120.00 | 39,627 |
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 |
|---|---|---|---|
| 23 October 2026 put at $120.00 | 10,459 | 56 | $1.1 million |
| 23 October 2026 call at $139.00 | 1,503 | 28 | $411,071 |
| 16 October 2026 call at $139.00 | 1,182 | 524 | $267,132 |
| 25 September 2026 call at $131.00 | 758 | 101 | $187,984 |
| 16 October 2026 call at $132.00 | 294 | 12 | $147,000 |
| 16 October 2026 put at $126.00 | 219 | 1 | $41,391 |
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 built since 22 September 2026
| Contract | Open interest now | Change |
|---|---|---|
| 16 October 2026 call at $142.00 | 2,401 | +2,401 |
| 16 October 2026 call at $137.00 | 1,169 | +1,169 |
| 16 October 2026 put at $120.00 | 27,507 | +781 |
| 16 October 2026 call at $145.00 | 7,101 | +653 |
| 16 October 2026 call at $139.00 | 524 | +524 |
| 16 October 2026 call at $140.00 | 7,571 | +506 |
| 25 September 2026 call at $135.00 | 1,159 | +504 |
| 16 October 2026 call at $146.00 | 435 | +435 |
Contracts whose open interest rose by 250 or more against the previous day's snapshot.
Source
CBOE delayed quotes for C, the free 15-minute-delayed chain, read once a day. Figures describe positioning; they are not a forecast.
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