Execution Price
The following monthly statistics on execution price reflect the percent of shares executed at or within the National Best Bid or Offer (NBBO). The NBBO is a consolidated quote representing the highest bid and lowest offer for a given security across all exchanges and/or market makers. It is updated continuously during market hours.
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Price Improvement
The following monthly statistics on price improvement reflect the percentage of shares executed at prices better than the prevailing National Best Bid or Offer (NBBO), i.e., either below the best offer for buys or above the best bid for sells.
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Execution Speed
The following statistics on execution speed show the elapsed time between the time Fidelity receives an order and the time of execution.

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Effective Spread
The following statistics on Effective Spread show monthly changes in the ratio between Effective Spread and the Average Quoted Spread.

What is Effective Spread?
Effective Spread measures the distance from the midpoint of the market at the time when your order is entered to the execution price you receive. This value is doubled to capture the whole bid/offer spread.
For example:
A stock is quoted with a bid of $10.00 and an ask of $10.04 at the time your order is entered. The quoted spread is $0.04. The midpoint price is $10.02 and your buy order is executed at $10.03. The difference between the midpoint ($10.02) and your execution price ($10.03) is $.01. This value is doubled, so the effective spread on your order is $.02. The lower the effective spread value, the better.

Effective Spread calculates how much above the midpoint price you paid on a buy order and how much below the midpoint price you received on a sell order.
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