Aon PLC AON
$335.77 +$0.96 (+0.29%)
Market closed · Nov 10, 4:10 am ET · Last extended-hours $335.77 0.00%
Open$337.25
Prev close$334.81
Day range$332.17 – $339.82
Volume1.02M
Market cap$71.24B
P/E (TTM)18.4
Dividend yield0.93%
Average implied volatility across the listed chain right now: 51%. 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 |
|---|---|---|---|---|---|---|
| 20 Nov 2026 | $340.00 | $6.10 | $3.50/$6.90 | 26 | 213 | 30% |
| 20 Nov 2026 | $330.00 | $10.81 | $10.00/$12.30 | 0 | 187 | 34% |
| 20 Nov 2026 | $350.00 | $1.90 | $0.90/$3.60 | 17 | 15 | 30% |
| 20 Nov 2026 | $320.00 | $18.39 | $17.20/$20.30 | 0 | 119 | 37% |
| 20 Nov 2026 | $360.00 | $0.96 | $0.25/$2.35 | 0 | 162 | 35% |
| 20 Nov 2026 | $310.00 | $26.48 | $26.50/$29.30 | 0 | 310 | 44% |
| 20 Nov 2026 | $370.00 | $0.89 | $0.15/$1.90 | 0 | 16 | 41% |
| 20 Nov 2026 | $300.00 | $35.89 | $36.00/$38.30 | 0 | 165 | 48% |
| 20 Nov 2026 | $380.00 | $0.83 | $0.00/$2.25 | 0 | 63 | 47% |
| 20 Nov 2026 | $290.00 | $45.73 | $45.50/$48.70 | 0 | 152 | 59% |
| 20 Nov 2026 | $390.00 | $0.76 | $0.00/$2.20 | 0 | 10 | 54% |
| 20 Nov 2026 | $280.00 | $55.57 | $55.10/$58.50 | 0 | 89 | 64% |
| 20 Nov 2026 | $400.00 | $0.70 | $0.00/$2.15 | 0 | 12 | 60% |
| 20 Nov 2026 | $270.00 | $65.44 | $65.20/$68.50 | 0 | 9 | 76% |
| 20 Nov 2026 | $410.00 | $0.64 | $0.00/$2.15 | 0 | 3 | 65% |
Puts
| Expiry | Strike | Last | Bid/Ask | Volume | Open interest | IV |
|---|---|---|---|---|---|---|
| 20 Nov 2026 | $340.00 | $10.41 | $6.50/$9.00 | 0 | 2 | 24% |
| 20 Nov 2026 | $330.00 | $5.35 | $1.85/$5.20 | 0 | 2 | 27% |
| 20 Nov 2026 | $350.00 | $17.24 | $13.60/$16.90 | 0 | 123 | 25% |
| 20 Nov 2026 | $320.00 | $2.93 | $0.40/$2.60 | 0 | 78 | 30% |
| 20 Nov 2026 | $360.00 | $25.69 | $22.40/$25.20 | 0 | 27 | 0% |
| 20 Nov 2026 | $310.00 | $1.05 | $0.05/$1.20 | 1 | 592 | 33% |
| 20 Nov 2026 | $370.00 | $35.64 | $32.00/$35.20 | 0 | 0 | 0% |
| 20 Nov 2026 | $300.00 | $0.45 | $0.00/$2.55 | 0 | 88 | 40% |
| 20 Nov 2026 | $380.00 | $45.59 | $42.30/$45.10 | 0 | 0 | 0% |
| 20 Nov 2026 | $290.00 | $0.30 | $0.00/$2.30 | 0 | 70 | 46% |
| 20 Nov 2026 | $390.00 | $55.53 | $51.90/$54.80 | 0 | 0 | 0% |
| 20 Nov 2026 | $280.00 | $0.15 | $0.00/$2.20 | 0 | 91 | 50% |
| 20 Nov 2026 | $400.00 | $65.48 | $61.90/$64.80 | 0 | 0 | 0% |
| 20 Nov 2026 | $270.00 | $0.04 | $0.00/$2.15 | 0 | 90 | 50% |
| 20 Nov 2026 | $410.00 | $75.43 | $71.90/$75.50 | 0 | 0 | 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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