35% of Deribit’s Bitcoin options open interest is set to expire October 30

About 35% of all Bitcoin options open interest on Deribit is tied to a single date: October 30. That works out to a notional value of approximately $10.7 to $11.3 billion, all scheduled to settle at 08:00 UTC that morning.

For context, that makes it the largest single expiry cluster on the platform. It is bigger than the December 25 contracts, which usually get top billing as the holiday blockbuster of the options calendar.

What traders are betting on

The single largest strike concentration is the October 30 $95,000 call, which holds roughly 24,000 BTC of open interest.

With Bitcoin trading near $86,000, that strike alone represents roughly $2.1 billion in notional value. A call option pays off if the price rises above a set level, so a crowd at $95,000 is a crowd expecting a meaningful move higher.

The put-to-call ratio sits somewhere between 0.4 and 0.51, meaning there are roughly two calls for every put on this expiry.

For the October 30 expiry, max-pain levels are identified at around $78,000 to $79,000. That is below where Bitcoin currently trades, which creates an awkward gap between where buyers want the price to go and where sellers would profit most.

How big is this, really

Total Bitcoin options open interest on Deribit has been reported in the $29 to $36 billion range. Against that backdrop, a single date holding more than a third of the total is a lot of eggs in one basket.

The buildup follows a run of large expiries that recently cleared, including those in late September. Once those contracts rolled off, traders began repositioning, and much of that fresh money appears to have landed on October 30.

What this means for the market

When a huge block of calls sits at a strike like $95,000, market makers who sell options may need to buy more Bitcoin if the price climbs toward that level. That buying can, in theory, push prices further in the same direction. The process can also run in reverse if prices slip and hedges are unwound.

The research flags these potential gamma-hedging flows, along with alignment between options and futures positioning, as factors that may influence how Bitcoin trades into the expiry.

A market with relatively few protective bets is a market that may not be well cushioned if prices turn lower. Without much downside insurance in place, a sharp move against the crowd could force traders to react quickly, which may amplify volatility rather than dampen it.

Bitcoin near $86,000 sits well above the $78,000 to $79,000 max-pain zone. The tension between a crowd of upside bets and a max-pain level several thousand dollars lower is the sort of setup that keeps options desks glued to their screens.

A few things are worth tracking as the date approaches. First, whether open interest at the $95,000 strike keeps growing or starts to thin out as traders take profits or roll positions forward. Second, whether the put-to-call ratio stays near its current 0.4 to 0.51 range. Third, how futures positioning evolves alongside the options book, as alignment between the two could reinforce whichever direction the market picks.

Once roughly a third of Deribit’s open interest rolls off in a single morning, the hedges tied to those contracts no longer need to be maintained, and the December 25 expiry would then become the next big date on the calendar.