Approximately $18.1 billion in Bitcoin and Ethereum options expire on Deribit at 08:00 UTC on September 25, 2026 — the largest quarterly settlement of the year. Bitcoin accounts for $15.9 billion of the total across roughly 182,000 contracts; Ethereum adds $2.1 billion. The expiring book is heavi...
"The September expiry is call-heavy... this is one of the largest quarterly expirations of the year." — Luuk Strijers, CEO, Deribit
Approximately $18.1 billion in Bitcoin and Ethereum options expire on Deribit at 08:00 UTC on September 25, 2026 — the largest quarterly settlement of the year. Bitcoin accounts for $15.9 billion of the total across roughly 182,000 contracts; Ethereum adds $2.1 billion. The expiring book is heavily skewed toward calls: Bitcoin's put/call ratio sits at 0.66-0.69, and 55% of the $9.4 billion call book is in the money with BTC trading near $86,000, more than $10,000 above the $75,000 max pain level.
The expiry will erase 37% of Deribit's total Bitcoin open interest in a single settlement window. Dealer hedging flows that mechanically supported Bitcoin's rally from $76,000 to $87,000 over the past week will cease. Combined with same-day U.S. durable goods data and CME Bitcoin futures settlement, September 25 presents a concentration of catalysts that could reset short-term trading ranges in either direction.
The September 25 quarterly expiry on Deribit represents $18.1 billion in combined BTC and ETH notional open interest, according to data compiled by Coinbase. The breakdown:
| Asset | Notional OI | Contracts | Put/Call OI Ratio | |-------|-------------|-----------|-------------------| | Bitcoin | $15.9B | ~182,000 | 0.66 | | Ethereum | $2.1B | — | 0.61 | | Total | $18.1B | — | — |
For context, the Q2 2026 quarterly expiry totaled $10.9 billion ($9.3 billion BTC, $1.6 billion ETH). The Q3 figure represents a 66% increase quarter-over-quarter. The expiring contracts account for 37% of Deribit's total Bitcoin open interest of approximately $43.5 billion.
Deribit commands roughly 85% of global BTC and ETH options activity. The remaining 15% is split across CME, OKX, and Binance. The Friday settlement uses a 30-minute time-weighted average price (TWAP) calculated between 07:30 and 08:00 UTC.
August Bitcoin options turnover on Deribit reached $56.13 billion. Ethereum turnover was $7.14 billion. Derivatives activity remained elevated heading into the quarterly settlement, with aggregate crypto open interest across all venues at $156 billion — up 7.59% over the prior week.
The call book dominates. Bitcoin call open interest totals $9.6 billion versus $6.5 billion in puts. More than half — 55% — of call notional is in the money at current spot prices near $86,000.
Strike concentrations tell the story:
Max pain — the price at which the largest number of options expire worthless — sits at $75,000. Bitcoin's current trading price is $10,000-$11,000 above that level. Historically, spot prices gravitate toward max pain heading into settlement, but the effect weakens when open interest is call-heavy and spot is well above the pain point.
Jean-David Péquignot, Deribit's Chief Commercial Officer, noted that the distribution of open interest across strike prices "suggests a price floor around $75,000."
The mechanical relationship between options positioning and spot price is central to understanding the current market. When dealers (market makers) sell call options to clients, they accumulate short gamma exposure. To remain delta-neutral, they must buy the underlying asset as its price rises. This creates a feedback loop: client call buying forces dealer hedging, which amplifies upward moves.
Bitcoin's rally from $76,000 on September 17 to above $87,000 on September 21 — a 14.5% move in four days — coincided with $999 million in single-day spot ETF inflows and heavy call activity on Deribit. The zero-gamma level, where dealer hedging flips from dampening to amplifying price moves, was approximately $71,000, according to CryptoSlate analysis.
This creates a specific risk at settlement. Once the quarterly options expire, the hedging flows that supported the rally cease. Dealers unwind their hedges. The mechanical buying gets, as Deribit's Péquignot put it, "switched off, potentially abruptly."
The one-standard-deviation implied move for Bitcoin through Friday settlement is approximately $2,720, or 3.15% of spot. That places the implied settlement band between $83,600 and $89,100.
Deribit's DVOL index — a 30-day implied volatility measure modeled after the VIX — stood at 38.1 on September 22. Friday's at-the-money implied volatility matched at 38.1%. The 25-delta put and call implied volatilities converged near 39.2%, indicating the options market priced roughly symmetric tail risk in both directions.
A DVOL reading of 38.1 is classified as "very low" across five years of Deribit history. This matters because low implied volatility often precedes sharp moves. Options are cheap. Hedging costs are low. When a catalyst arrives — and the Q3 expiry, U.S. economic data, and CME futures settlement all land on the same day — suppressed volatility can uncoil.
The 24-hour volume put/call ratio of 0.37 for Bitcoin, versus the 0.66 open interest ratio, suggests recent trading activity has skewed even further toward calls. Traders are buying upside into the expiry rather than protecting downside.
Ethereum's options book mirrors Bitcoin's directional bias at smaller scale. Call open interest totals $1.34 billion against $820.1 million in puts, for a 0.61 put/call ratio.
ETH traded between $2,750 and $2,766 on September 23, having rallied from $2,416 on September 16 — a 14.5% gain that tracked Bitcoin's move almost exactly. Max pain sits at $2,200, well below spot.
Call interest concentrates between $3,000 (8.7% above spot) and $4,000 (45% above spot). The $3,000 strike represents a near-term target; the $4,000 positioning is speculative.
The 24-hour volume put/call ratio of 0.55 for ETH is higher than Bitcoin's 0.37, indicating relatively more put activity. Ethereum's options market, while directionally aligned with Bitcoin, prices a wider uncertainty band.
The options expiry does not exist in isolation. The past week brought the strongest spot Bitcoin ETF inflows since October 2025:
| Date | Net ETF Inflows | |------|----------------| | Sept. 17 | $159.5M | | Sept. 18 | $433M | | Sept. 21 | $999M | | Sept. 22 | $347M | | Weekly total | $2.06B |
The $999 million single-day inflow on September 21 was the largest of 2026. According to CoinDesk, the demand was spread across multiple ETF products rather than concentrated in BlackRock's IBIT, which has previously dominated large inflow days for carry trade purposes.
The convergence of ETF inflows and options expiry creates a two-sided dynamic. ETF buyers provide a floor of demand. But if post-expiry volatility triggers ETF outflows — as happened after the March 2026 quarterly settlement — the floor can give way.
Total short liquidations in the 24 hours preceding September 23 reached $647.9 million, with total liquidations at $746.6 million. The leveraged market is positioned long.
Three variables determine what happens after 08:00 UTC on Friday: dealer hedge unwinding, roll activity, and macro data.
Scenario 1: Orderly rollover. Traders roll expiring September calls into October and December contracts. Open interest migrates forward. Hedging demand is maintained, albeit with lower gamma intensity. BTC consolidates in the $83,000-$89,000 band. This outcome requires continued ETF inflows and no macro shock from durable goods data.
Scenario 2: Volatility expansion. Hedge unwinding creates a supply of BTC as dealers sell previously purchased hedge positions. BTC drops toward the $80,000-$83,000 zone — still above max pain but below the implied one-sigma band. Perpetual funding rates flip negative. The move is sharp but contained.
Scenario 3: Breakout. Roll demand exceeds expiring open interest. Fresh call buying at $90,000 and $100,000 strikes forces a new round of dealer hedging. BTC tests $90,000. This requires a macro tailwind or a new institutional flow catalyst.
Deribit's Strijers and Péquignot flagged "increased volatility and potential reset in trading ranges" following settlement. The Q3 expiry coincides with CME Bitcoin futures settlement, amplifying the potential for abrupt moves.
The scale of this expiry — $18.1 billion — reflects a structural change in how crypto prices are determined. Options now account for approximately 3% of total crypto derivatives volume, up from negligible share five years ago. The total crypto derivatives market generated roughly $85.7 trillion in volume in 2025.
Deribit's platform holds 85% of crypto options open interest. CME's share is growing through regulated BTC and ETH options products. Institutional participation in derivative trading grew 56% year-over-year, and approximately 42% of derivatives volume now comes from institutional players.
The economic consequence is that options dealers — not spot traders — increasingly set the marginal bid and ask in Bitcoin markets around expiry events. Gamma hedging, pin risk, and strike magnetism are no longer obscure concepts. They are operative forces in $86,000 Bitcoin.
This concentration of price-setting power in options market makers introduces a specific fragility. When 37% of open interest expires on a single day, the removal of hedging activity creates a vacuum. How quickly new positioning fills that vacuum determines short-term direction.
The September 25 options expiry is a mechanical event with directional implications. The call-heavy book, combined with BTC trading well above max pain, means dealers will sell hedges when contracts expire. Whether that selling is absorbed by new positioning or triggers a pullback is the open question.
The low DVOL reading adds a specific concern: the market is not pricing the risk of the event it is about to undergo. Implied volatility at five-year lows going into the largest quarterly expiry of the year is a mismatch. Either the expiry passes without incident and DVOL was correct, or volatility expands and option sellers face losses.
What is not in question is the structural importance of the event. When $18.1 billion in options notional settles in a 30-minute TWAP window, the price consequences are determined by dealer mechanics, not narratives. The data shows a market positioned for upside that is about to lose its hedging support. What comes next is a function of flows, not conviction.