AON · NYSE · Finance

What does it cost to trade Aon Plc Class A?

A $10,000 order costs about $4.71 (4.71 bps) between the half-spread and market impact.

Data as of 1 November 2026

Cost of $10k$4.71
Estimated quoted spread8.37 bps
Average daily trading value$592M
Daily volatility1.35%
1-day VaR (95%) on $10,000$222
Liquidity tierGood

Estimated cost by order size

Order Half-spread Market impact Total Share of daily volume
$1,000 4.19 bps 0.21 bps $0.44 · 4.39 bps < 0.01%
$10,000 4.19 bps 0.52 bps $4.71 · 4.71 bps < 0.01%
$100,000 4.19 bps 1.31 bps $54.98 · 5.50 bps 0.017%

Liquidity

Aon Plc Class A trades about $592M a day, which puts it in the good liquidity tier. At that depth the model estimates a quoted spread of 8.37 bps, so a market order pays roughly half of it on the way in, and again on the way out. An order stays below 1% of a normal day's trading up to about $5.9M.

Volatility and risk

Daily volatility is around 1.35%, which is moderate for a stock. On a $10,000 position, the 1-day value at risk at 95% is about $222: on one trading day in twenty, a loss larger than that should be expected. Volatility also widens spreads, which the cost estimate above already includes.

How these figures are estimated

Spread: PreTrAIde's liquidity-tier model (average daily trading value) with a volatility uplift and a one-tick floor. Market impact: an Almgren-Chriss-style model on the order's share of daily volume. VaR: 1.645 × daily volatility. Inputs are 30-day average volume and recent price range. These are estimates, not quotes: the real cost depends on the market when the order is placed. PreTrAIde Methodology: How a Pre-Trade Analysis Is Computed

Frequently asked questions

How much does it cost to buy $10,000 of Aon Plc Class A?

PreTrAIde estimates about $4.71 (4.71 bps) for a $10,000 market order in Aon Plc Class A: $4.19 of half-spread and $0.52 of market impact, before any broker commission.

Is Aon Plc Class A a liquid stock?

Aon Plc Class A trades about $592M a day, in the good liquidity tier of PreTrAIde's model, with an estimated quoted spread of 8.37 bps.

How volatile is Aon Plc Class A?

Its daily volatility is about 1.35% (moderate). The 1-day 95% value at risk on a $10,000 position is about $222.

Analyze AON inside your whole basket

A pre-trade analysis adds news, analyst ratings, concentration and an AI verdict (GO, NO-GO or MODIFY) for every stock you plan to trade.

Start your free trial Trading Cost Calculator: Spread, Market Impact and Commission

Similar stocks

CME · CME Group Inc. Class A Cost of $10k: $4.46 · Good CB · Chubb Limited Cost of $10k: $3.74 · Good ALL · Allstate Corporation Cost of $10k: $3.96 · Good URI · United Rentals, Inc. Cost of $10k: $4.91 · Good MRSH · Marsh & McLennan Companies, Inc. Cost of $10k: $4.16 · Good TRV · Travelers Companies, Inc. Cost of $10k: $4.09 · Good PGR · Progressive Corporation Cost of $10k: $3.85 · Good ICE · Intercontinental Exchange, Inc. Cost of $10k: $4.71 · Good

All stocks →

Educational content, not investment advice. PreTrAIde is analysis software, not a broker: it never executes orders, and its verdicts are decision support, not recommendations to buy or sell.