NYSE Refines Auction Price Math for Smoother Trades
Published Date: 2/23/2026
Notice
Summary
NYSE American is updating how it calculates auction prices to better match real market moves during opening, halt, and closing auctions. This change helps traders see clearer, fairer prices when buying or selling stocks on the Exchange. The new rule kicks in right away with no extra fees, making auctions smoother and more transparent for everyone involved.
Analyzed Economic Effects
3 provisions identified: 3 benefits, 0 costs, 0 mixed.
Auction reference price now uses last-sale
The Exchange changed how it sets the Auction Reference Price for the Core Open Auction. The new cascade first uses the price of the last consolidated trade of at least one round lot on that trading day, then the midpoint of the Auction NBBO, then a locked NBBO price, and initially the prior trading day's Official Closing Price; subsequent calculations use the most recently calculated Auction Reference Price.
Exclude TRF early/late trades from reference price
Auction Reference Price calculations for the Core Open Auction, Closing Auction, and Trading Halt Auction will exclude trades reported on Trade Reporting Facilities that occurred during the Early Trading Session or Late Trading Session. This narrows which trades can be used as benchmarks when computing reference prices for those auctions.
Implementation timing and announcement plan
The Exchange filed the proposed rule change on February 6, 2026 and it became effective upon filing. The Exchange will announce the implementation date by Trader Update and expects to implement the changes no later than the third quarter of 2026.
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