Aon (AON) Options Chain

NYSE: AONFinanceSpecialty InsurersUSD

277.12+6.65 (+2.46%)

At close: Oct 8, 4:00 PM ET · Delayed 15 min

Expiration date

Expiration: Oct 16, 2026
Days to expiration: 8
Share price: $277.12
Put/call ratio (OI): 0.61
Put/call ratio (volume): 1.63
ATM implied volatility: 33.6%
Expected move: ±$13.79
Open interest (C / P): 3.07K / 1.88K

AON options summary

The AON options chain for the October 16, 2026 expiration lists 29 call and 23 put contracts, with 8 days until expiration. Open interest stands at 3,071 calls and 1,883 puts, a put/call ratio of 0.61, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $280.00 strike is 33.6%, which implies the market expects a move of about ±$13.79 (5.0%) in Aon stock by expiration.

The most open interest sits at the $390.00 call (447 contracts) and the $300.00 put (506 contracts).

Summary generated from market data by MetaCap's automated system. Methodology

AON options chain · October 16, 2026

AON calls and puts by strike price. Shaded cells are in the money.
Calls							Puts
OI	Vol	IV	Last	Bid	Ask	Strike	Bid	Ask	Last	IV	Vol	OI
2	2	649.5%	143.10	131.40	135.60	195.00	0.00	2.15	0.45	145.5%	1	4
—	—	—	—	—	—	200.00	0.00	0.75	0.05	112.7%	3	6
2	2	78.5%	77.00	66.00	68.40	210.00	0.00	0.00	2.70	50.0%	1	0
—	—	—	—	—	—	220.00	0.00	2.15	0.10	103.2%	1	4
1	—	507.3%	100.60	98.20	101.70	230.00	—	—	—	—	—	—
4	2	53.5%	33.10	35.90	38.90	240.00	0.05	0.85	0.25	58.5%	1	8
34	33	65.4%	25.00	26.30	29.00	250.00	0.00	0.75	0.30	50.4%	2	40
—	—	—	16.00	—	—	260.00	0.25	0.90	0.62	37.2%	30	276
31	10	35.6%	9.62	8.40	10.00	270.00	1.75	2.45	2.00	32.6%	43	193
AON $277.12
386	48	31.1%	3.45	3.10	3.80	280.00	5.20	7.50	10.75	36.2%	1	470
213	63	31.9%	0.70	0.50	1.20	290.00	13.00	15.50	14.70	43.8%	1	191
161	1	44.4%	0.12	0.00	1.05	300.00	22.00	24.20	25.18	47.6%	252	506
150	1	52.3%	0.26	0.00	0.75	310.00	32.30	34.40	35.60	62.9%	218	144
149	3	47.2%	0.11	0.00	0.15	320.00	41.50	44.40	42.50	75.0%	18	12
154	1	52.5%	0.09	0.00	0.10	330.00	51.70	54.10	52.60	81.8%	16	11
82	2	63.5%	0.18	0.00	0.30	340.00	62.30	64.20	63.25	72.9%	2	8
175	1	99.0%	0.57	0.00	2.15	350.00	71.50	74.20	72.89	103.5%	6	6
387	6	108.0%	0.15	0.00	2.15	360.00	81.50	84.30	83.01	62.5%	1	3
79	1	103.2%	0.70	0.00	1.10	370.00	91.50	94.10	93.28	119.7%	2	0
153	1	124.9%	0.40	0.00	2.15	380.00	55.50	58.90	25.60	—	—	1
447	86	95.9%	0.01	0.00	0.25	390.00	65.50	68.60	34.69	—	44	0
322	113	112.9%	0.01	0.00	0.55	400.00	121.50	124.40	105.55	95.7%	1	0
115	13	119.2%	0.25	0.00	0.55	410.00	—	—	—	—	—	—
0	1	50.0%	1.50	0.00	0.00	420.00	—	—	—	—	—	—
5	1	161.8%	0.70	0.00	2.15	430.00	—	—	—	—	—	—
10	1	168.4%	0.73	0.00	2.15	440.00	—	—	—	—	—	—
0	1	50.0%	1.05	0.00	0.00	450.00	—	—	—	—	—	—
1	1	187.1%	1.05	0.00	2.60	460.00	—	—	—	—	—	—
6	2	193.3%	0.65	0.00	2.60	470.00	—	—	—	—	—	—
1	—	197.9%	0.50	0.00	2.50	480.00	201.50	204.40	142.80	135.9%	—	0
1	—	202.3%	0.35	0.00	2.40	490.00	128.80	132.90	135.60	—	1	0

In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.

Frequently asked questions

What is the AON put/call ratio?

For the October 16, 2026 expiration, the AON put/call ratio based on open interest is 0.61 (1,883 puts vs 3,071 calls), and 1.63 based on today's volume. A ratio above 1 means more puts than calls.

What is AON's implied volatility?

At-the-money implied volatility for AON options expiring October 16, 2026 is about 33.6%, an annualized estimate of how much the market expects Aon stock to move.

How many AON option expiration dates are there?

AON has 5 listed expiration dates, from Oct 16, 2026 to Apr 16, 2027.

What does "in the money" mean?

A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.