AON · Aon plc

Track AON — free Ask ALVIS about AON

$358.30 -2.45 (-0.68%) At close · Aug 7

Market Cap

$76.00B

212.13M

Options Chain

15-min delayed Underlying $358.30 · at close Aug 7, 2026 Options Calculator

Positioning

Aug 21, 2026 · 12 days to expiry · 62 contracts

Put / call OI

0.67

Call-heavy positioning

Open interest

2,577

contracts outstanding

Volume

173

traded today

Max pain

$360.00

$1.70 above spot

ATM implied vol

28.4%

market's expected move

Open interest by strike · near the money

Calls Puts

185

190

195

200

210

220

230

240

250

260

270

280

290

300

310

320

330

340

350

360

370

380

390

400

410

420

430

440

450

460

470

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 12d Sep 18 40d Oct 16 68d Jan 15 159d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	—	—	—		$0.14	-0.012	170.6%	1	4
Call · $185 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $185 Last $0.14 Breakeven $184.86 Implied vol 170.6% Delta -0.012 ≈1% ITM Gamma 0 Theta -0.137 Vega 0.024 Open interest 4 Model this put
0	—	—	—	—		$0.06	-0.012	164.3%	2	2
Call · $190 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $190 Last $0.06 Breakeven $189.94 Implied vol 164.3% Delta -0.012 ≈1% ITM Gamma 0 Theta -0.136 Vega 0.024 Open interest 2 Model this put
0	—	0.1%	1	—		$0.14	-0.013	158.1%	1	1
Call · $195 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.009 Vega 0 Open interest 0 Model this call Put · $195 Last $0.14 Breakeven $194.86 Implied vol 158.1% Delta -0.013 ≈1% ITM Gamma 0 Theta -0.135 Vega 0.025 Open interest 1 Model this put
0	—	0.1%	1	—		—	-0.02	168.2%	—	0
Call · $200 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.009 Vega 0 Open interest 0 Model this call Put · $200 Last — Breakeven — Implied vol 168.2% Delta -0.02 ≈2% ITM Gamma 0 Theta -0.216 Vega 0.025 Open interest 0 Model this put
0	1	—	—	$156.40		—	-0.012	136.8%	—	0
Call · $210 In the money Last $156.40 Breakeven $366.40 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $210 Last — Breakeven — Implied vol 136.8% Delta -0.012 ≈1% ITM Gamma 0 Theta -0.112 Vega 0.026 Open interest 0 Model this put
0	—	—	—	—		—	-0.015	129.7%	—	0
Call · $220 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $220 Last — Breakeven — Implied vol 129.7% Delta -0.015 ≈2% ITM Gamma 0 Theta -0.131 Vega 0.026 Open interest 0 Model this put
0	—	0.1%	1	—		$0.88	-0.031	138.8%	1	0
Call · $230 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.012 Vega 0 Open interest 0 Model this call Put · $230 Last $0.88 Breakeven $229.12 Implied vol 138.8% Delta -0.031 ≈3% ITM Gamma 0.001 Theta -0.258 Vega 0.054 Open interest 0 Model this put
0	—	—	—	—		$1.44	-0.015	105.7%	1	1
Call · $240 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $240 Last $1.44 Breakeven $238.56 Implied vol 105.7% Delta -0.015 ≈2% ITM Gamma 0.001 Theta -0.107 Vega 0.027 Open interest 1 Model this put
0	—	—	—	—		$1.75	-0.017	96.2%	1	1
Call · $250 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $250 Last $1.75 Breakeven $248.25 Implied vol 96.2% Delta -0.017 ≈2% ITM Gamma 0.001 Theta -0.106 Vega 0.028 Open interest 1 Model this put
0	—	0.1%	1	—		$2.65	-0.019	87.1%	1	2
Call · $260 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.015 Vega 0 Open interest 0 Model this call Put · $260 Last $2.65 Breakeven $257.35 Implied vol 87.1% Delta -0.019 ≈2% ITM Gamma 0.001 Theta -0.104 Vega 0.029 Open interest 2 Model this put
0	—	0.1%	1	—		$1.07	-0.022	80%	2	13
Call · $270 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.016 Vega 0 Open interest 0 Model this call Put · $270 Last $1.07 Breakeven $268.93 Implied vol 80% Delta -0.022 ≈2% ITM Gamma 0.001 Theta -0.112 Vega 0.029 Open interest 13 Model this put
0	—	—	—	—		$1.14	-0.023	69.9%	2	66
Call · $280 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $280 Last $1.14 Breakeven $278.86 Implied vol 69.9% Delta -0.023 ≈2% ITM Gamma 0.001 Theta -0.1 Vega 0.03 Open interest 66 Model this put
0	—	0.1%	1	—		$0.25	-0.026	61.8%	4	17
Call · $290 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.018 Vega 0 Open interest 0 Model this call Put · $290 Last $0.25 Breakeven $289.75 Implied vol 61.8% Delta -0.026 ≈3% ITM Gamma 0.001 Theta -0.099 Vega 0.03 Open interest 17 Model this put
0	—	0.1%	1	—		$0.80	-0.037	55.5%	2	208
Call · $300 In the money Last — Breakeven — Implied vol 0.1% Delta 1 ≈100% ITM Gamma 0 Theta -0.019 Vega 0 Open interest 0 Model this call Put · $300 Last $0.80 Breakeven $299.20 Implied vol 55.5% Delta -0.037 ≈4% ITM Gamma 0.002 Theta -0.117 Vega 0.061 Open interest 208 Model this put
0	—	31.9%	0.994	—		$1.70	-0.078	57.7%	2	66
Call · $310 In the money Last — Breakeven — Implied vol 31.9% Delta 0.994 ≈99% ITM Gamma 0.001 Theta -0.034 Vega 0.013 Open interest 0 Model this call Put · $310 Last $1.70 Breakeven $308.30 Implied vol 57.7% Delta -0.078 ≈8% ITM Gamma 0.004 Theta -0.222 Vega 0.108 Open interest 66 Model this put
6	2	—	—	$40.40		$0.50	-0.099	49.4%	5	234
Call · $320 In the money Last $40.40 Breakeven $360.40 Implied vol — Delta — Gamma — Theta — Vega — Open interest 6 Model this call Put · $320 Last $0.50 Breakeven $319.50 Implied vol 49.4% Delta -0.099 ≈10% ITM Gamma 0.005 Theta -0.226 Vega 0.11 Open interest 234 Model this put
19	1	22.3%	0.979	$32.70		$0.05	-0.09	34.2%	1	30
Call · $330 In the money Last $32.70 Breakeven $362.70 Implied vol 22.3% Delta 0.979 ≈98% ITM Gamma 0.003 Theta -0.051 Vega 0.031 Open interest 19 Model this call Put · $330 Last $0.05 Breakeven $329.95 Implied vol 34.2% Delta -0.09 ≈9% ITM Gamma 0.007 Theta -0.145 Vega 0.111 Open interest 30 Model this put
63	3	25.9%	0.874	$23.13		$2.24	-0.163	30%	20	39
Call · $340 In the money Last $23.13 Breakeven $363.13 Implied vol 25.9% Delta 0.874 ≈87% ITM Gamma 0.012 Theta -0.164 Vega 0.168 Open interest 63 Model this call Put · $340 Last $2.24 Breakeven $337.76 Implied vol 30% Delta -0.163 ≈16% ITM Gamma 0.012 Theta -0.192 Vega 0.169 Open interest 39 Model this put
89	2	26.4%	0.698	$25.58		$3.92	-0.325	30.8%	1	159
Call · $350 In the money Last $25.58 Breakeven $375.58 Implied vol 26.4% Delta 0.698 ≈70% ITM Gamma 0.02 Theta -0.262 Vega 0.226 Open interest 89 Model this call Put · $350 Last $3.92 Breakeven $346.08 Implied vol 30.8% Delta -0.325 ≈33% ITM Gamma 0.018 Theta -0.29 Vega 0.227 Open interest 159 Model this put
Underlying $358.30
149	5	26.8%	0.479	$7.20		$8.40	-0.518	30%	2	8
Call · $360 Last $7.20 Breakeven $367.20 Implied vol 26.8% Delta 0.479 ≈48% ITM Gamma 0.023 Theta -0.297 Vega 0.264 Open interest 149 Model this call Put · $360 In the money Last $8.40 Breakeven $351.60 Implied vol 30% Delta -0.518 ≈52% ITM Gamma 0.02 Theta -0.307 Vega 0.264 Open interest 8 Model this put
298	5	26.8%	0.273	$3.60		$13.38	-0.696	31.4%	4	31
Call · $370 Last $3.60 Breakeven $373.60 Implied vol 26.8% Delta 0.273 ≈27% ITM Gamma 0.019 Theta -0.244 Vega 0.237 Open interest 298 Model this call Put · $370 In the money Last $13.38 Breakeven $356.62 Implied vol 31.4% Delta -0.696 ≈70% ITM Gamma 0.017 Theta -0.276 Vega 0.236 Open interest 31 Model this put
349	1	31.2%	0.165	$1.50		$26.93	-0.824	32.9%	20	106
Call · $380 Last $1.50 Breakeven $381.50 Implied vol 31.2% Delta 0.165 ≈17% ITM Gamma 0.012 Theta -0.21 Vega 0.184 Open interest 349 Model this call Put · $380 In the money Last $26.93 Breakeven $353.07 Implied vol 32.9% Delta -0.824 ≈82% ITM Gamma 0.012 Theta -0.209 Vega 0.182 Open interest 106 Model this put
278	2	32.2%	0.083	$0.60		$19.85	-0.879	38.2%	1	42
Call · $390 Last $0.60 Breakeven $390.60 Implied vol 32.2% Delta 0.083 ≈8% ITM Gamma 0.007 Theta -0.133 Vega 0.125 Open interest 278 Model this call Put · $390 In the money Last $19.85 Breakeven $370.15 Implied vol 38.2% Delta -0.879 ≈88% ITM Gamma 0.008 Theta -0.188 Vega 0.123 Open interest 42 Model this put
10	1	45.8%	0.107	$1.50		$30.13	-0.951	36.1%	3	3
Call · $400 Last $1.50 Breakeven $401.50 Implied vol 45.8% Delta 0.107 ≈11% ITM Gamma 0.006 Theta -0.227 Vega 0.126 Open interest 10 Model this call Put · $400 In the money Last $30.13 Breakeven $369.87 Implied vol 36.1% Delta -0.951 ≈95% ITM Gamma 0.005 Theta -0.082 Vega 0.066 Open interest 3 Model this put
98	1	40.7%	0.039	$0.23		—	-0.926	50.1%	—	0
Call · $410 Last $0.23 Breakeven $410.23 Implied vol 40.7% Delta 0.039 ≈4% ITM Gamma 0.003 Theta -0.092 Vega 0.074 Open interest 98 Model this call Put · $410 In the money Last — Breakeven — Implied vol 50.1% Delta -0.926 ≈93% ITM Gamma 0.005 Theta -0.171 Vega 0.118 Open interest 0 Model this put
184	71	47.6%	0.038	$0.35		—	-0.926	58.5%	—	0
Call · $420 Last $0.35 Breakeven $420.35 Implied vol 47.6% Delta 0.038 ≈4% ITM Gamma 0.003 Theta -0.105 Vega 0.075 Open interest 184 Model this call Put · $420 In the money Last — Breakeven — Implied vol 58.5% Delta -0.926 ≈93% ITM Gamma 0.004 Theta -0.201 Vega 0.104 Open interest 0 Model this put
1	1	52.2%	0.032	$1.39		—	-0.96	56.2%	—	0
Call · $430 Last $1.39 Breakeven $431.39 Implied vol 52.2% Delta 0.032 ≈3% ITM Gamma 0.002 Theta -0.1 Vega 0.038 Open interest 1 Model this call Put · $430 In the money Last — Breakeven — Implied vol 56.2% Delta -0.96 ≈96% ITM Gamma 0.003 Theta -0.113 Vega 0.069 Open interest 0 Model this put
0	—	60.8%	0.037	—		—	-0.951	65.7%	—	0
Call · $440 Last — Breakeven — Implied vol 60.8% Delta 0.037 ≈4% ITM Gamma 0.002 Theta -0.131 Vega 0.076 Open interest 0 Model this call Put · $440 In the money Last — Breakeven — Implied vol 65.7% Delta -0.951 ≈95% ITM Gamma 0.003 Theta -0.158 Vega 0.073 Open interest 0 Model this put
0	—	74.4%	0.057	—		—	-0.965	67.9%	—	0
Call · $450 Last — Breakeven — Implied vol 74.4% Delta 0.057 ≈6% ITM Gamma 0.002 Theta -0.226 Vega 0.077 Open interest 0 Model this call Put · $450 In the money Last — Breakeven — Implied vol 67.9% Delta -0.965 ≈97% ITM Gamma 0.002 Theta -0.122 Vega 0.067 Open interest 0 Model this put
0	—	67.1%	0.026	—		—	-0.967	73.4%	—	0
Call · $460 Last — Breakeven — Implied vol 67.1% Delta 0.026 ≈3% ITM Gamma 0.001 Theta -0.105 Vega 0.039 Open interest 0 Model this call Put · $460 In the money Last — Breakeven — Implied vol 73.4% Delta -0.967 ≈97% ITM Gamma 0.002 Theta -0.126 Vega 0.036 Open interest 0 Model this put
0	—	71.8%	0.024	—		—	-0.971	76.8%	—	0
Call · $470 Last — Breakeven — Implied vol 71.8% Delta 0.024 ≈2% ITM Gamma 0.001 Theta -0.107 Vega 0.039 Open interest 0 Model this call Put · $470 In the money Last — Breakeven — Implied vol 76.8% Delta -0.971 ≈97% ITM Gamma 0.001 Theta -0.117 Vega 0.036 Open interest 0 Model this put

About this data

Greeks, implied volatility, open interest and the last price come from the latest daily snapshot and are 15-minute delayed. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown. The 24 strikes around the money are shown by default — switch to "All 31" for the wings. Max pain is the listed strike where the most open interest would expire worthless — a positioning reference, not a forecast.

Key facts CIK 315293 CUSIP G0403H108 13F (30d) 698 filings 661 filers Visit website Investor relations