NYSE Tweaks When Traders See IPO Auction Imbalance Information
Published Date: 11/12/2026
Notice
Summary
The New York Stock Exchange is changing when it shares auction imbalance info for IPOs. Starting soon, this info will be released no earlier than 8:00 a.m. ET and no later than 10:00 a.m. ET or when the market maker gives the first update. This tweak helps traders get clearer, timely info during IPO auctions without changing any fees or costs.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
IPO auction imbalance info timing change
For IPO Auctions, the Exchange will begin publishing Auction Imbalance Information at the later of (A) 8:00 a.m. Eastern Time, or (B) the earlier of (i) the time the Designated Market Maker (DMM) publishes the first pre-opening indication under Rule 7.35A(d) or (ii) 10:00 a.m. ET. The content of the Auction Imbalance Information is unchanged and the Exchange says it expects to implement the change no later than the first quarter of 2027.
Opening Reference Price defined for IPOs
The Exchange amends the definition of "Opening Reference Price" so that for an IPO that has not had its IPO Auction, the Opening Reference Price is the security's offering price. This update is intended to ensure the Imbalance Reference Price calculation works for IPOs once Auction Imbalance Information begins disseminating.
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