September Quarterly Bitcoin and Ether Options Expiries

Late-September quarterly options expiries have concentrated attention across crypto derivatives venues as large, call-heavy books approach their settlement windows. Different data snapshots paint slightly different totals: Coinbase Markets reported roughly $18.1 billion of combined Bitcoin and Ethereum options open interest approaching the Sept. 25 quarterly expiry, a Deribit-sourced snapshot showed about $18.29 billion split across BTC and ETH, another Deribit breakdown counted roughly $15.6 billion in notional value (about 182,000 BTC of open contracts — ~106,200 calls vs. ~75,900 puts). Those divergences reflect timing and price changes between snapshots rather than contradictory mechanics; the central theme is the same: notable call dominance across both BTC and ETH books.

Open-interest put/call ratios reported by Coinbase were 0.66 for Bitcoin and 0.61 for Ether, while Deribit- and model-based reads also show calls outnumbering puts. Strike concentration varies by report: Coinbase highlighted call clusters near $90,000 and $100,000 for Bitcoin and calls in the $3,000–$4,000 band for Ether; a ByKaranteli gamma map placed a primary call wall around $95,000 and a largest put wall near $60,000 with a zero-gamma flip at roughly $71,000. Deribit’s own strike-by-strike book identified $70,000 as the busiest strike overall, listing both its largest call (8,705 BTC) and largest put (7,653 BTC) there, while other heavy call positions sit at $90,000 and $100,000 and major put clusters at $60,000 and $75,000. Deribit’s dashboard also put max pain near $76,000.

Volatility and implied-move indicators point to a moderate expected range through expiry: Deribit’s DVOL and ATM IV readings were around the high 30s (for example 38.1%), with a one-standard-deviation move through Friday roughly ~$2,720, implying a near-term band near $83,600–$89,100 and putting $90,000 at the outer edge. That mathematics helps frame how far hedging flows may extend, but it does not compel spot to hit those strikes. Dealers’ hedging behavior matters: when shorts are forced to buy into strength they can add fuel to rallies; when those hedges disappear at expiry or roll into later months, the stabilizing effect can change.

Timing compounds the risk: Deribit’s quarterly options settle at 08:00 UTC on Sept. 25 using an index TWAP from 07:30–08:00 UTC. Within hours the U.S. durable goods report (12:30 UTC), the University of Michigan consumer sentiment final reading (14:00 UTC), and CME’s September Bitcoin futures settlement (15:00 UTC) arrive, creating three tests in one trading day. Market participants also noted ETF flow dynamics in recent days (reports cited inflows such as $159.5M, $433M and $999M on separate days) and large short liquidations (roughly $647.9M in one 24-hour window), all supportive of the rally to date. The near-term outcome hinges on whether buyers, ETF demand, and hedging behavior remain in place once expiring positions unwind or roll, and whether macro releases amplify or dampen moves created around the expiry.