Merck & Co MRK
$146.73 −$0.21 (-0.14%)
Market closed · Nov 6, 8:10 pm ET · Last extended-hours $146.73 0.00%
Open$144.34
Prev close$146.94
Day range$142.80 – $147.48
Volume7.63M
Market cap$361.73B
P/E (TTM)148.2
Dividend yield2.32%
Average implied volatility across the listed chain right now: 40%. Implied volatility measures how big a price swing the options market is pricing in — there is no fixed “normal” level, it varies a lot by stock.
Open interest by strike
Nearest listed expiry only. Calls above the line, puts below — clusters mark strikes where the market has built up the most open positions.
Implied volatility by strike
The “volatility smile”: strikes far from the current price often price in richer implied volatility than at-the-money strikes.
Calls
| Expiry | Strike | Last | Bid/Ask | Volume | Open interest | IV |
|---|---|---|---|---|---|---|
| 13 Nov 2026 | $147.00 | $2.53 | $2.20/$2.82 | 182 | 29 | 37% |
| 13 Nov 2026 | $146.00 | $2.96 | $2.78/$3.45 | 16 | 63 | 38% |
| 13 Nov 2026 | $148.00 | $2.05 | $1.68/$2.46 | 191 | 69 | 37% |
| 13 Nov 2026 | $145.00 | $3.63 | $3.30/$4.15 | 44 | 137 | 39% |
| 13 Nov 2026 | $149.00 | $1.70 | $1.55/$1.84 | 23 | 118 | 37% |
| 13 Nov 2026 | $144.00 | $4.18 | $3.45/$4.80 | 23 | 36 | 35% |
| 13 Nov 2026 | $150.00 | $1.38 | $1.05/$1.56 | 151 | 124 | 36% |
| 13 Nov 2026 | $143.00 | $4.74 | $4.20/$5.55 | 6 | 29 | 36% |
| 13 Nov 2026 | $142.00 | $6.09 | $5.30/$6.30 | 16 | 76 | 39% |
| 13 Nov 2026 | $141.00 | $6.69 | $5.90/$7.65 | 17 | 267 | 43% |
| 13 Nov 2026 | $152.50 | $0.73 | $0.54/$0.82 | 70 | 186 | 36% |
| 13 Nov 2026 | $140.00 | $7.75 | $6.85/$8.15 | 40 | 353 | 42% |
| 13 Nov 2026 | $139.00 | $8.47 | $7.60/$8.75 | 50 | 56 | 37% |
| 13 Nov 2026 | $155.00 | $0.34 | $0.25/$0.40 | 106 | 428 | 36% |
| 13 Nov 2026 | $138.00 | $9.25 | $8.50/$9.95 | 30 | 97 | 43% |
Puts
| Expiry | Strike | Last | Bid/Ask | Volume | Open interest | IV |
|---|---|---|---|---|---|---|
| 13 Nov 2026 | $147.00 | $2.79 | $2.54/$2.97 | 50 | 36 | 37% |
| 13 Nov 2026 | $146.00 | $2.30 | $1.96/$2.52 | 584 | 14 | 37% |
| 13 Nov 2026 | $148.00 | $3.92 | $2.90/$3.65 | 0 | 342 | 37% |
| 13 Nov 2026 | $145.00 | $1.91 | $1.56/$2.07 | 92 | 375 | 37% |
| 13 Nov 2026 | $149.00 | $4.44 | $3.50/$4.25 | 0 | 3 | 37% |
| 13 Nov 2026 | $144.00 | $1.57 | $1.04/$2.73 | 365 | 283 | 44% |
| 13 Nov 2026 | $150.00 | $4.59 | $4.20/$4.90 | 4 | 69 | 37% |
| 13 Nov 2026 | $143.00 | $1.20 | $1.12/$1.54 | 131 | 56 | 41% |
| 13 Nov 2026 | $142.00 | $0.99 | $0.87/$1.11 | 678 | 72 | 39% |
| 13 Nov 2026 | $141.00 | $0.80 | $0.70/$0.90 | 21 | 36 | 40% |
| 13 Nov 2026 | $152.50 | $6.65 | $5.65/$6.85 | 0 | 206 | 33% |
| 13 Nov 2026 | $140.00 | $0.70 | $0.40/$0.83 | 39 | 131 | 40% |
| 13 Nov 2026 | $139.00 | $1.00 | $0.41/$0.66 | 1 | 44 | 42% |
| 13 Nov 2026 | $155.00 | $8.61 | $7.60/$9.65 | 0 | 20 | 39% |
| 13 Nov 2026 | $138.00 | $0.55 | $0.32/$0.46 | 1 | 188 | 42% |
Open interest = contracts currently outstanding (not yet closed out). Higher open interest generally means a strike/expiry is more actively traded and easier to get in and out of.
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