Bitcoin’s year-end options expiry has kept volatility unusually compressed, even as the broader macro backdrop and risk-asset positioning have turned more supportive for higher prices.

Throughout December, bitcoin has remained pinned in a narrow $85,000–$90,000 range, despite U.S. equities rallying and gold pushing to record highs. That disconnect has frustrated crypto investors, but the explanation lies less in sentiment and more in derivatives market mechanics.

Those same dynamics now suggest the range may be close to resolving to the upside. Once the options expire, the balance of probabilities favors a move toward the mid-$90,000s rather than a sustained breakdown below $85,000.

The key factor has been a heavy clustering of options exposure around current spot levels. Options give traders the right, but not the obligation, to buy or sell bitcoin at a predetermined price. Call options benefit from rising prices, while put options pay off when prices fall. Dealers who write these contracts hedge their exposure in the spot and futures markets, guided by two key measures: delta and gamma.

Delta reflects how much an option’s value changes for a $1 move in bitcoin, while gamma measures how quickly that delta shifts as prices move. When gamma is high and concentrated near spot, dealers are forced to buy into dips and sell into rallies, mechanically dampening volatility.

According to analyst David on X, large put gamma near $85,000 throughout December effectively acted as a downside floor, compelling dealers to buy bitcoin on weakness. At the same time, heavy call gamma around $90,000 capped upside moves, with dealers selling into strength. The result was a self-reinforcing trading range driven by hedging flows rather than directional conviction.

That stabilizing force is set to fade as roughly $27 billion in bitcoin options expire on Dec. 26. As expiry approaches, both gamma and delta decay, reducing the need for aggressive dealer hedging.

This particular expiry is notable not only for its size but also for its bullish skew. More than half of Deribit’s open interest is rolling off, with a put-call ratio of just 0.38 — meaning call options outnumber puts by nearly three to one. Much of that open interest is concentrated in upside strikes between $100,000 and $116,000.

The so-called “max pain” level — the price at which option buyers suffer the greatest losses and sellers typically benefit — sits near $96,000, further reinforcing the upside bias.

Meanwhile, implied volatility remains subdued. The Bitcoin Volmex implied volatility index is hovering near one-month lows around 45, signaling that traders are not pricing in elevated near-term risk — a setup that leaves room for a volatility expansion once the options-related pressure lifts.