Merck & Co., Inc. options tape
Read from CBOE's delayed chain on 23 September 2026, with Merck & Co., Inc. at $151.92: open interest within 90 days was 116,398 call and 85,227 put contracts, a put/call ratio of 0.73; the day's volume was 37,288 calls and 4,976 puts (0.13). The most call open interest sits at the $150.00 strike (20,415 contracts) and the most put open interest at $135.00 (14,783). The at-the-money straddle for 25 September 2026, 2 days out, was priced at 2.2% of spot. For 16 October 2026, implied volatility was 27.4% at the put 5% below spot and 27.2% at the call 5% above, +0.2 points.
Where the open interest sits
| Side | Strike | Open interest |
|---|---|---|
| Calls | $150.00 | 20,415 |
| Puts | $135.00 | 14,783 |
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 call at $175.00 | 10,374 | 418 | $2.4 million |
| 25 September 2026 call at $152.50 | 1,299 | 510 | $136,395 |
| 25 September 2026 put at $152.50 | 515 | 3 | $117,420 |
| 23 October 2026 put at $144.00 | 404 | 26 | $80,800 |
| 25 September 2026 put at $149.00 | 507 | 50 | $40,560 |
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 |
|---|---|---|
| 25 September 2026 call at $157.50 | 3,400 | +1,662 |
| 16 October 2026 call at $155.00 | 6,307 | +1,656 |
| 16 October 2026 call at $150.00 | 5,244 | +1,335 |
| 20 November 2026 call at $155.00 | 1,803 | +744 |
| 20 November 2026 put at $145.00 | 2,424 | +717 |
| 25 September 2026 call at $160.00 | 1,117 | +648 |
| 25 September 2026 call at $155.00 | 755 | +594 |
| 16 October 2026 put at $145.00 | 1,982 | +442 |
Contracts whose open interest rose by 250 or more against the previous day's snapshot.
Source
CBOE delayed quotes for MRK, the free 15-minute-delayed chain, read once a day. Figures describe positioning; they are not a forecast.
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