Cboe Stretches IPO Quote Time for Fairer Price Signals
Published Date: 4/3/2026
Notice
Summary
Cboe BZX Exchange is updating its rules to make IPO auctions smoother by changing how the “Indicative Price” is defined and giving more time for quote-only periods during IPO auctions, especially for exchange-traded products (ETPs). This helps traders get better price info and more time to place quotes, making IPOs fairer and more efficient. These changes kick in quickly and could impact how IPOs are priced and traded on the exchange.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 0 costs, 1 mixed.
ETP IPO Price Validation Test Added
For ETP IPOs, the Exchange will require a price validation test starting at 9:30 a.m. ET: the lead market maker (LMM) must provide an “Expected Price” and may set upper and lower price bands (default bands of $0.10 each if not set; bands may be up to $0.50). If the live Indicative Price moves outside the bands, the Quote-Only Period is automatically extended in 5-second increments and the test is re-run, but the test will not extend the Quote-Only Period past 9:45 a.m. ET under this provision.
Indicative Price: Auction-Only Calculation
For IPO Auctions, the “Indicative Price” is determined only from the Auction Book (not the Continuous Book) — because no Continuous Book exists before trading starts. The rule change makes the Indicative Price for IPO Auctions the price at which the most shares from the Auction Book would match.
Separate Quote-Only Rules for ETPs vs Corporate IPOs
The Exchange separates Quote-Only Period extension rules for BZX-listed corporate securities and ETP IPO Securities. Notably, the underwriter-request extension remains applicable to corporate IPOs but is not included for ETP IPOs (ETPs have no underwriters); other extension triggers remain, including automatic extension while unmatched market orders remain on the Auction Book and a five-minute automatic extension if the Indicative Price moves the greater of 10% or $0.50 in the 15 seconds before the auction.
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Key Dates
Department and Agencies
Related Federal Register Documents
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Previous / Next Documents
Previous: 2026-06473 — Self-Regulatory Organizations; Nasdaq PHLX LLC; Notice of Filing and Immediate Effectiveness of a Proposal To Amend the Exchange's Anti-Internalization Functionality in Equity 4, Rule 3307, and To Extend the Implementation Date of the CORE FIX Order Entry Protocol
Nasdaq PHLX is updating a rule that helps stop trades from accidentally happening within the same firm, which keeps trading costs down. They’re also pushing back the start date for a new order entry system called CORE FIX. These changes affect traders using Nasdaq PHLX and aim to make trading smoother without extra costs, with the new system launch delayed to give everyone more time to get ready.
Next: 2026-06475 — Self-Regulatory Organizations; Cboe Exchange, Inc.; Notice of Filing of Amendment No. 1 and Order Granting Accelerated Approval of a Proposed Rule Change, as Modified by Amendment No. 1, To Amend Cboe Rule 5.4
Cboe Exchange is changing the smallest price step for options on its Mini Bitcoin ETF Index to make trading smoother and clearer. This change affects traders using these options and kicks in quickly after approval, with no extra costs involved. The SEC gave this update a fast green light, so expect the new rules to start soon!
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