Every fill you get is measured against the NBBO — the best price the whole market is showing at that instant. It’s the yardstick of a fair fill.
NoVo Options Trading ·
Educational only, not financial advice. Market rules and thresholds can change — verify current specifics with the exchanges or your broker.
The NBBO (National Best Bid and Offer) is the highest bid and lowest offer available across all exchanges at any moment — the benchmark your broker must consider when filling your order. It’s the yardstick of a fair fill.
What it is
Stocks and options trade on many venues, each with its own bid and ask. The NBBO consolidates them into the single best bid (highest price a buyer will pay anywhere) and best offer (lowest a seller will accept anywhere). Under regulation, your order should generally be filled at the NBBO or better, so it’s the reference point for whether you got a fair price.
Why it matters
The NBBO is why you can trust that a marketable order fills at a competitive price even though the market is fragmented across venues. It’s also the baseline for price improvement (filling better than the NBBO). The tighter the NBBO spread, the cheaper it is to trade — another reason liquid strikes matter.
The NBBO is the whole market’s best price in one number — the standard your fill is measured against, no matter which venue actually executes it.
What it means for a scalper
You benefit from the NBBO on every trade — it’s why fragmented markets still give retail competitive prices. On liquid SPY options the NBBO spread is tiny (a penny or two). Understanding it demystifies fills and connects to payment for order flow and price improvement.
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NoVo is a software tool for market analysis, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.
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