ChainCatcher News, the U.S. Securities and Exchange Commission (SEC) has initiated a review process on the proposal submitted by the Chicago Board Options Exchange (Cboe) to amend Rule 5.4, to decide whether to approve the adjustment of the minimum quote increment for Cboe Mini Bitcoin US ETF Index (MBTX) options. The proposal plans to set the minimum quote size for option series with a trading price below $3 at 0.01 USD, and for series with a trading price of $3 and above at 0.05 USD. The SEC is currently soliciting public comments on this proposal, with a deadline of January 21, 2026.
Cboe stated that MBTX is a micro index tracking the performance of mainstream Bitcoin spot ETFs in the US market (such as IBIT). This move aims to align the quote granularity of MBTX options with that of BlackRock iShares Bitcoin Trust (IBIT) options, narrowing the bid-ask spread through more precise pricing.
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