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GlaxoSmithKline GSK

$49.71
+$0.00 (0.00%)
Market open · Sep 24, 2:00 pm ET
After hours $49.71 0.00%
Open$49.54
Prev close$49.71
Day range$49.57 – $50.14
Volume1.55M
Market cap$99.59B
P/E (TTM)15.9
Dividend yield3.57%

Average implied volatility across the listed chain right now: 38%. 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.

Calls

ExpiryStrikeLastBid/AskVolumeOpen interestIV
25 Sep 2026 $49.50 $1.79 $1.05/$1.20 0 0 25%
25 Sep 2026 $50.00 $0.80 $0.70/$0.85 417 20 23%
25 Sep 2026 $49.00 $2.21 $1.40/$1.55 0 19 25%
25 Sep 2026 $48.50 $2.68 $1.40/$2.70 0 0 34%
25 Sep 2026 $51.00 $0.35 $0.30/$0.40 23 105 24%
25 Sep 2026 $48.00 $3.16 $1.65/$2.65 0 17 0%
25 Sep 2026 $47.50 $3.64 $1.50/$3.20 0 42 0%
25 Sep 2026 $52.00 $0.10 $0.10/$0.20 7 53 25%
25 Sep 2026 $47.00 $4.12 $1.25/$4.60 0 1 0%
25 Sep 2026 $53.00 $0.14 $0.00/$0.30 1 204 33%
25 Sep 2026 $46.00 $5.08 $2.40/$6.10 0 0 27%
25 Sep 2026 $54.00 $0.22 $0.00/$2.15 0 52 47%
25 Sep 2026 $45.00 $6.06 $3.10/$7.30 0 0 0%
25 Sep 2026 $55.00 $0.20 $0.00/$0.35 0 61 52%
25 Sep 2026 $44.00 $7.06 $4.20/$7.90 0 0 0%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
25 Sep 2026 $49.50 $0.26 $0.30/$0.40 0 2,020 24%
25 Sep 2026 $50.00 $0.35 $0.45/$0.60 0 25 23%
25 Sep 2026 $49.00 $0.40 $0.20/$0.30 3 178 26%
25 Sep 2026 $48.50 $0.15 $0.10/$0.25 0 1 27%
25 Sep 2026 $51.00 $1.10 $1.05/$1.20 3 22 24%
25 Sep 2026 $48.00 $0.11 $0.05/$0.20 29 12 29%
25 Sep 2026 $47.50 $0.10 $0.05/$0.15 8 0 31%
25 Sep 2026 $52.00 $1.50 $0.75/$3.50 0 13 36%
25 Sep 2026 $47.00 $0.09 $0.00/$0.10 5 18 35%
25 Sep 2026 $53.00 $3.04 $2.50/$4.10 2 5 54%
25 Sep 2026 $46.00 $0.04 $0.00/$0.10 0 26 36%
25 Sep 2026 $54.00 $3.20 $1.80/$5.90 0 0 36%
25 Sep 2026 $45.00 $0.01 $0.00/$0.10 0 11 36%
25 Sep 2026 $55.00 $4.17 $3.10/$6.90 0 0 56%
25 Sep 2026 $44.00 $0.00 $0.00/$1.15 0 23 37%

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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