GlaxoSmithKline GSK
$50.33 −$0.08 (-0.16%)
Market closed · Nov 7, 9:10 am ET · Last extended-hours $50.33 0.00%
Open$49.07
Prev close$50.41
Day range$48.94 – $50.74
Volume3.19M
Market cap$100.88B
P/E (TTM)17.5
Dividend yield3.56%
Average implied volatility across the listed chain right now: 50%. 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 | $50.00 | $0.76 | $0.85/$1.90 | 13 | 22 | 47% |
| 13 Nov 2026 | $51.00 | $0.55 | $0.05/$1.40 | 9 | 96 | 40% |
| 13 Nov 2026 | $49.50 | $1.44 | $1.05/$2.15 | 0 | 1 | 45% |
| 13 Nov 2026 | $49.00 | $1.80 | $1.45/$1.85 | 4 | 113 | 32% |
| 13 Nov 2026 | $52.00 | $0.20 | $0.15/$0.55 | 6 | 94 | 37% |
| 13 Nov 2026 | $48.50 | $2.21 | $0.90/$3.60 | 0 | 0 | 44% |
| 13 Nov 2026 | $48.00 | $2.65 | $2.05/$3.20 | 0 | 7 | 43% |
| 13 Nov 2026 | $53.00 | $0.18 | $0.00/$0.15 | 0 | 29 | 38% |
| 13 Nov 2026 | $47.50 | $3.09 | $1.85/$3.40 | 0 | 0 | 0% |
| 13 Nov 2026 | $47.00 | $3.54 | $2.20/$3.90 | 0 | 14 | 0% |
| 13 Nov 2026 | $54.00 | $0.08 | $0.00/$0.35 | 0 | 0 | 38% |
| 13 Nov 2026 | $46.00 | $4.50 | $3.10/$4.90 | 0 | 0 | 0% |
| 13 Nov 2026 | $55.00 | $0.03 | $0.00/$0.30 | 0 | 23 | 38% |
| 13 Nov 2026 | $45.00 | $5.48 | $4.10/$6.60 | 0 | 10 | 0% |
| 13 Nov 2026 | $56.00 | $0.01 | $0.00/$1.95 | 0 | 154 | 38% |
Puts
| Expiry | Strike | Last | Bid/Ask | Volume | Open interest | IV |
|---|---|---|---|---|---|---|
| 13 Nov 2026 | $50.00 | $0.76 | $0.55/$1.90 | 5 | 27 | 56% |
| 13 Nov 2026 | $51.00 | $1.45 | $0.55/$1.75 | 0 | 47 | 31% |
| 13 Nov 2026 | $49.50 | $0.68 | $0.00/$1.65 | 0 | 0 | 42% |
| 13 Nov 2026 | $49.00 | $0.46 | $0.00/$1.20 | 2 | 1 | 40% |
| 13 Nov 2026 | $52.00 | $2.21 | $1.20/$3.40 | 0 | 3 | 52% |
| 13 Nov 2026 | $48.50 | $0.38 | $0.00/$1.35 | 0 | 0 | 43% |
| 13 Nov 2026 | $48.00 | $0.28 | $0.05/$0.50 | 0 | 13 | 43% |
| 13 Nov 2026 | $53.00 | $3.11 | $1.85/$4.40 | 0 | 0 | 56% |
| 13 Nov 2026 | $47.50 | $0.19 | $0.00/$0.40 | 0 | 13 | 44% |
| 13 Nov 2026 | $47.00 | $0.10 | $0.00/$0.35 | 10 | 32 | 41% |
| 13 Nov 2026 | $54.00 | $4.03 | $3.20/$5.40 | 0 | 0 | 76% |
| 13 Nov 2026 | $46.00 | $0.05 | $0.00/$0.90 | 0 | 3 | 43% |
| 13 Nov 2026 | $55.00 | $4.99 | $4.20/$6.00 | 0 | 0 | 75% |
| 13 Nov 2026 | $45.00 | $0.02 | $0.00/$0.60 | 0 | 61 | 42% |
| 13 Nov 2026 | $56.00 | $5.97 | $5.20/$7.40 | 0 | 0 | 96% |
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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