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Stocks AON

Aon PLC AON

US equityMarket cap rank #273
$276.65
−$4.95 (-1.76%)
Market open · Sep 24, 1:10 pm ET
After hours $282.60 +0.36%
Open$281.81
Prev close$281.60
Day range$276.36 – $283.03
Volume1.07M
Market cap$58.68B
P/E (TTM)15.3
Dividend yield1.10%

Average implied volatility across the listed chain right now: 41%. 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
16 Oct 2026 $280.00 $20.36 $18.00/$21.00 0 4 28%
16 Oct 2026 $270.00 $28.37 $26.40/$29.50 1 1 30%
16 Oct 2026 $290.00 $12.79 $10.90/$13.60 13 2 27%
16 Oct 2026 $260.00 $38.79 $36.30/$39.30 0 0 38%
16 Oct 2026 $300.00 $7.00 $4.90/$7.30 12 74 24%
16 Oct 2026 $250.00 $48.48 $46.00/$48.80 0 0 42%
16 Oct 2026 $310.00 $3.51 $2.05/$3.80 210 85 24%
16 Oct 2026 $240.00 $58.21 $55.20/$58.80 0 2 46%
16 Oct 2026 $320.00 $1.63 $1.45/$2.10 6 140 27%
16 Oct 2026 $230.00 $68.00 $65.10/$68.60 0 1 51%
16 Oct 2026 $330.00 $0.83 $0.65/$1.05 9 132 28%
16 Oct 2026 $220.00 $77.83 $75.10/$78.50 0 0 58%
16 Oct 2026 $340.00 $1.28 $0.05/$0.85 0 92 29%
16 Oct 2026 $210.00 $87.69 $85.70/$87.90 0 2 67%
16 Oct 2026 $350.00 $0.10 $0.00/$0.50 8 203 27%

Puts

ExpiryStrikeLastBid/AskVolumeOpen interestIV
16 Oct 2026 $280.00 $2.30 $1.30/$2.80 6 87 24%
16 Oct 2026 $270.00 $0.87 $0.90/$1.35 180 26 28%
16 Oct 2026 $290.00 $4.90 $3.00/$5.70 7 118 22%
16 Oct 2026 $260.00 $0.45 $0.30/$0.60 30 71 29%
16 Oct 2026 $300.00 $9.90 $8.00/$11.30 7 706 24%
16 Oct 2026 $250.00 $0.94 $0.00/$0.50 0 1 42%
16 Oct 2026 $310.00 $16.88 $15.20/$17.80 0 290 24%
16 Oct 2026 $240.00 $0.70 $0.00/$0.25 0 2 47%
16 Oct 2026 $320.00 $24.72 $23.50/$26.00 0 658 23%
16 Oct 2026 $230.00 $0.52 $0.00/$2.25 0 0 51%
16 Oct 2026 $330.00 $34.45 $32.60/$35.90 0 73 0%
16 Oct 2026 $220.00 $0.38 $0.00/$0.30 0 3 56%
16 Oct 2026 $340.00 $44.28 $42.20/$46.20 0 48 0%
16 Oct 2026 $210.00 $0.27 $0.00/$2.15 0 4 60%
16 Oct 2026 $350.00 $54.17 $52.20/$55.90 0 6 0%

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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