Cboe BZX caps the spread on crypto ETP market-maker quotes

Cboe BZX Exchange has filed a proposed rule change with the SEC to amend Rule 22.6, its market maker quotation rule, by adding bid/ask differentials that cap the width of the two-sided quotes firms maintain across the venue's listed products.

The SEC published the filing as a notice of immediate effectiveness, which means the rule takes effect on submission while the commission takes public comment and can still suspend it or open a disapproval proceeding. The proposal is mechanical by design: a new parameter inside an existing quoting regime, not a new product class and not a change to who may quote.

Rule 22.6 already requires BZX market makers—the registered firms on the other side of the order book—to post two-sided quotes, but it never limited how far apart the bid and the offer could sit; the new bid/ask differentials cap that distance, so a two-sided quote now has to satisfy a spread standard rather than merely exist.

The change lands hardest on BZX's crypto ETP listings. The venue is a primary listing home for those funds, and the firms bound by the amended rule are the registered market makers behind their order books, so the new differentials reach the liquidity obligations underneath the crypto ETP market's trading structure. For these products the quoted spread is pure friction on top of a reference price set by a digital asset trading continuously elsewhere, and the wider the quote, the more of the product's daily move is consumed by the cost of transacting.

A two-sided obligation with no differential can be satisfied by a quote a mile wide, with the bid and the offer both present and neither usable. Adopting a differential gives the exchange a test it can enforce and gives market makers a number they can price against, which is how a market structure rule becomes something a trading desk actually feels.

The number that will decide how much this bites is the width BZX chose, and it sits inside the notice rather than the filing line. If the caps track the tightness of US equity market making, the cost structure of crypto ETP liquidity just shifted; if they track the wider conventions of digital asset trading, the rule will mostly write existing practice into rule text. Market makers on the venue will read the notice for that one figure, and so will the sponsors whose products depend on their quotes.