Bitcoin’s year-end options expiry has acted as a lid on volatility, even as the macro backdrop and broader risk assets have shifted in ways that would normally support higher prices.
For most of December, bitcoin has been confined to a narrow $85,000–$90,000 range, lagging a rally in U.S. equities and gold’s run to record highs. While the lack of follow-through has frustrated investors, the explanation lies less in sentiment and more in the structure of the derivatives market.
Those structural forces now appear close to unwinding. Once the options expire, market dynamics suggest an upside resolution, with a move toward the mid-$90,000s more likely than a sustained break below $85,000.
The range-bound trade has been driven by a heavy clustering of options exposure around spot prices. Options grant traders the right, but not the obligation, to buy or sell bitcoin at a specified level. Call options benefit from rising prices, while puts gain when prices fall. Dealers who write these contracts hedge dynamically in spot and futures markets, guided by delta and gamma.
Delta measures how sensitive an option’s value is to a $1 move in bitcoin, while gamma reflects how quickly that sensitivity changes as price moves. When gamma is elevated near spot, dealers are forced to buy on weakness and sell into strength, mechanically suppressing volatility.
According to analyst David on X, large put gamma near $85,000 acted as a downside buffer throughout December, compelling dealers to buy bitcoin on dips. At the same time, heavy call gamma near $90,000 capped rallies, with dealers selling into strength. The result was a self-reinforcing range shaped by hedging flows rather than directional conviction.
That stabilizing influence is expected 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 frequent dealer hedging.
This expiry stands out for both its size and its bullish skew. More than half of Deribit’s open interest is set to roll off, and the put-call ratio sits at just 0.38 — indicating nearly three times as many calls as puts. A large share of open interest is concentrated in upside strikes between $100,000 and $116,000.
The “max pain” level — where option buyers would suffer the greatest losses and sellers would benefit most — sits near $96,000, reinforcing the upside bias.
Implied volatility also remains subdued. The Bitcoin Volmex implied volatility index is hovering near one-month lows around 45, suggesting traders are not pricing in elevated near-term risk and leaving room for a volatility expansion once options-related pressures lift.
