How to Buy Aon plc Class A (AON) Stock
Compare 13 brokers offering AON, check 24-hour trading availability, see options pricing, and find fractional-share eligibility.
- Day range
- $308.61 – $316.50
- 52-week range
- $304.59 – $381.00
- Volume
- 1.26M
- Market cap
- $67.57B
Where to buy AON
13 brokers in our matrix offer AON. Verify availability and current fees with each broker before trading.
| Broker | Commission | Fractional | Extended | Overnight | Options | OTC access |
|---|---|---|---|---|---|---|
 Charles Schwab (thinkorswim) | $0 | Schwab Stock Slices, S&P 500 only, ≥ $5/slice, up to 30 at once | ~1,130 | $0.65 | Most (3/5) | |
 E*TRADE (Morgan Stanley) | $0 listed | ~20 | $0.65 | Most (4/5) | ||
 Fidelity | $0 | Stocks by the Slice, 7,000+ stocks/ETFs, from $1 | $0.65 | Partial (2+0) | ||
 Firstrade | $0 | ~4,000+ tickers, ≥ $5 | ~1,200 | $0 | Most (4/5) | |
 Interactive Brokers | $0 (Lite) / per-share (Pro) | ~10,000 | per-contract pricing | Full | ||
 Merrill Edge | $0 | $0.65 | Most (3/5) | |||
 Moomoo | $0 | $0 | Limited only | |||
 Public.com | $0 | rebate model | Limited only | |||
 Robinhood | $0 | ≥ $1 stocks, market cap ≥ $25M | ~1,134 | $0 | None | |
 SoFi Active Investing | $0 | $0 | Partial (1+2) | |||
 tastytrade | $0 stocks | $1.00 open, $0 close (capped at $10 per leg) | Limited only | |||
 TradeStation | $0 listed | $0.50 / $0.60 | Most (4/5) | |||
 Webull | $0 | $0 | Limited only |
24-Hour / Overnight trading
AON may be eligible for overnight trading via Charles Schwab (thinkorswim), Interactive Brokers, Robinhood, E*TRADE (Morgan Stanley), Webull, Moomoo, Firstrade. Each broker maintains its own eligibility list — confirm before placing an order.
Overnight sessions route through ATSs, typically have wider spreads, accept limit orders only, and offer no guaranteed fills.
About Aon plc Class A
- Sector
- INSURANCE AGENTS, BROKERS & SERVICE
- Employees
- 60,000
- Headquarters
- DUBLIN 2, L2
- Listed
- 1975-02-18
- Market cap
- $67.57B
Frequently asked
Where can I buy Aon plc Class A (AON)?
AON is offered by 13 brokers in our matrix, including Charles Schwab (thinkorswim), E*TRADE (Morgan Stanley), Fidelity, Firstrade, Interactive Brokers. Compare commissions, fractional eligibility, and overnight availability in the broker matrix above.
Can I buy AON after hours or overnight?
Yes. AON is on the 24-hour eligibility list for Charles Schwab (thinkorswim), Interactive Brokers, Robinhood, E*TRADE (Morgan Stanley), and others. Overnight sessions route through ATSs with wider spreads and limit-orders only.
Does Robinhood offer AON?
Yes. Robinhood offers AON as a regular exchange-listed security.
Does Fidelity offer AON?
Yes. Fidelity offers AON as a regular exchange-listed security.
Does Webull offer AON?
Yes. Webull offers AON as a regular exchange-listed security.
Is AON optionable?
Yes. AON has listed options contracts. Per-contract pricing varies by broker — see the Options column in the matrix.
Is there a tokenized version of AON?
Not in our current dataset. The tokenized stock universe (Kraken xStocks, Binance Alpha/Ondo, Robinhood EU, Hyperliquid HIP-3) is expanding quickly — we refresh quarterly.
Can I buy a fractional share of AON?
Yes. Multiple brokers in the matrix support fractional shares for AON — see the Fractional column above for per-broker eligibility and minimums.