Bitcoin Derivatives Market Sees Largest Open Interest Drop in Over a Year

The Bitcoin derivatives market has seen a significant reduction in open interest over the past week, marking the largest drop since October 2025. According to CoinGlass data, aggregate futures open interest fell by approximately 49,000 BTC between September 22 and 29. This decline is notable given that it occurred without the usual accompanying liquidations, with only $67.6 million in cumulative derivatives liquidations registered over the past trading day.

Total trading volume in futures contracts reached $56.25 billion over the last 24 hours, while the spot price of Bitcoin remained relatively stable around $84,070. The decrease in open interest is attributed to a combination of factors, including low volatility and falling funding rates applied to perpetual swap positions.

Historically, large drops in open interest have been accompanied by significant liquidations. However, this time around, the reduction appears to be driven more by voluntary portfolio unwinding rather than forced margin calls. The absence of sharp price fluctuations and liquidity imbalances in order books further supports this interpretation.

The September monthly Bitcoin futures contract expired on the CME on Friday, September 25, contributing to a portion of the open interest reduction. An industry source suggests that this was largely due to institutional hedges being unwound at the close of the monthly cycle rather than a structural exit from the market.