Platforms and Brokers
Why the Screen Price and Your Fill Price Are Not Always the Same
By Walid Mograbi · · 2 min read
A displayed price can be informative without being a promise, because real execution depends on live tradable liquidity.
Why this lesson matters
A displayed price can be informative without being a promise, because real execution depends on live tradable liquidity.
The core idea
- Displayed price and fill price serve different roles.
- Liquidity and order type shape the actual outcome.
- The gap matters more in faster or thinner markets.
Practical example
A quote can look stable on screen while the tradable depth behind it is already shifting, producing a different real fill than expected.
Common mistakes to avoid
- Treating the screen price as a guarantee.
- Ignoring quote freshness.
- Ignoring the role of depth and order type.
Quick checklist
- Quote freshness
- Spread
- Depth
- Order type
- Liquidity context
Key takeaway
A good lesson improves judgment, risk control, and execution discipline before it changes action.
Important caution
Displayed prices are useful references, not execution promises.
Further reading
- https://www.nasdaq.com/articles/why-real-time-data-matters-when-trading-stocks
- https://www.finra.org/investors/insights/where-do-stocks-trade
#screen-price #fills #execution