About $18B in Bitcoin and Ether Options Near Deribit Expiry

Key Facts

Bitcoin and Ether options with about $17.76 billion in notional value are approaching expiry on Deribit at 08:00 UTC on Friday, Sept. 25, making the settlement a focal point for crypto-derivatives traders. A Sept. 23 market-data snapshot put BTC options in this expiry at $15.64 billion and ETH options at $2.12 billion. That places the combined amount near $18 billion, but it does not mean the same sum will change hands at settlement. The contracts are European-style options settled automatically under the exchange’s rules, and notional value is not a realized gain or loss. The expiry’s size also cannot, by itself, establish that volatility will surge or determine the direction of the market.

The snapshot’s components show call-heavy positioning in both assets, while also differing from figures circulated in earlier readings. For BTC, calls represented $9.17 billion of notional open interest and puts $6.47 billion, producing a 0.71 put-call ratio. For ETH, calls totaled $1.31 billion and puts $808.8 million, for a ratio of 0.62. An earlier snapshot estimated the BTC expiry at about $16 billion, including $9.6 billion in calls and $6.4 billion in puts. The changing figures are not necessarily inconsistent because dollar-denominated open interest moves with prices and with positions being opened or closed before expiry.

Notional value measures the contracts’ reference exposure; it is not the premium paid, collateral posted or net cash settlement. The $17.76 billion figure therefore should not be read as a block of money that must enter or leave the market at once. Call dominance also does not reveal whether holders have a net bullish position because an option can belong to a spread, hedge or other multi-leg strategy. The put-call ratio describes the composition of open interest but does not identify which side ultimately carries the directional exposure. A disciplined market reading must separate contract size from the book’s true risk direction, which aggregate figures do not disclose.

Any market effect from expiry is transmitted through dealer hedging and the options’ sensitivity to the underlying assets, not through notional value alone. If dealers must buy the asset as it rises and sell as it falls, their hedging can amplify a move; the opposite exposure can make them trade against the move and damp it. As expiry approaches, option delta changes quickly, while contracts far from profitability lose much of their price sensitivity. Investors may also close positions or roll them into a later expiry, shifting part of the exposure instead of settling it in the current event. The Sept. 25 impact therefore depends on dealers’ net exposure and available liquidity, neither of which is established by aggregate call and put totals.

Deribit’s rules provide a defined settlement process that reduces reliance on a single price observation at expiry. The delivery value is based on a time-weighted average of the relevant index between 07:30 and 08:00 UTC, with an observation taken every 4 seconds during that window. Expiring contracts close at 08:00 UTC, and in-the-money options are exercised automatically without physical delivery of Bitcoin or Ether. The exchange also reduces the delta of expiring contracts progressively to 0 during the final 30 minutes, an operational step that changes displayed risk measures near settlement. These rules make the 07:30-08:00 UTC window more relevant than one earlier price print, although they cannot prevent spot-market movement outside the index process.

Bitcoin enters the expiry period after a reference price of $85,506.01 on Sept. 23, within a daily range of $85,467.88 to $87,278.54. Ether recorded a reference price of $2,745.21 on the same date after trading between $2,744.58 and $2,789. Those prices provide a baseline for assessing which options may become profitable at settlement, but they are not the final delivery prices that will be used on Sept. 25. Any move in the two assets before the pricing window will alter the dollar value of open interest and the number of contracts carrying intrinsic value. The market’s size and positioning should therefore be refreshed near expiry instead of treating the Sept. 23 snapshot as a final outcome.

For a BTC or ETH holder, the main risk is not the $17.76 billion figure itself but whether hedging changes spot-market liquidity and the speed of price moves near settlement. For an option buyer, the result depends on the delivery price relative to the strike after accounting for the premium, not on the broader market being call-heavy. An option seller is more exposed to changes in intrinsic value and margin as expiry nears, particularly when the asset moves rapidly across strike prices. For a trader shorting volatility, the event’s completion is helpful only if hedging demand subsides without being replaced by fresh directional demand. Call dominance is therefore not an independent buy signal, just as a large expiry alone is insufficient grounds for shorting BTC or ETH.

The decisive pricing window on Sept. 25 will begin at 07:30 UTC and end with settlement at 08:00 UTC. Before then, traders should track changes in open interest, rolls into later expiries and price movement through the most concentrated strikes because those variables determine how much hedging remains. After 08:00 UTC, the first test will be whether liquidity normalizes as the expiring contracts disappear or whether fresh spot and derivatives demand sustains the move. Falling open interest and volatility after settlement would support the view that the event was a temporary technical pressure; continued expansion alongside new positions would weaken that interpretation. Until those observations are available, the expiry is best described as a potential volatility catalyst rather than a guaranteed cause or a directional forecast.