When you submit an options order, it doesn't teleport to "the market." It travels a routing chain: your broker receives it, a smart order router decides where to send it, and it lands at one of many options exchanges (or a market maker) to be matched. Every link in that chain affects the price and speed of your fill.

The routing decision

There are many options exchanges, each with its own liquidity and fees. A smart router weighs where the best price is, which venue is likely to fill, and rebate/fee economics. For retail flow, the order is often sent to a wholesale market maker that pays for it and fills against the NBBO — frequently with a bit of price improvement.

Why it shapes your fill

Routing determines whether you get the best available price, how fast you fill, and how much slippage you eat. On liquid SPY options the differences are small; on thin contracts and in fast markets they widen. Understanding that your fill is the output of a routing process — not a single "market" — makes you a sharper judge of execution quality.

There's no single "market." Your fill is whatever survived the trip through the routing chain.

What the trader controls

You don't control routing directly, but you control the order type, the limit price, and the instrument's liquidity — the inputs that determine how well the chain serves you. A systematic tool leans into the controllable parts: trading liquid SPY options, pricing orders against the live quote, and never sending a blind market order into a thin book. That's execution hygiene NoVo enforces on every order.