Open interest across bitcoin futures exchanges has hit an all-time high for the year, underpinned by a comeback across the cryptocurrency market.

Aggregate open interest (OI) across Binance, Bybit, OKx and a number of other exchanges topped $11.5 billion on June 25, according to The Block's data dashboard.

While cryptocurrencies were trading slightly lower Monday along with most risk assets, the price of Bitcoin has picked up 16.8% over the last 14 days according to CoinGecko. 

The bullish price action has been underpinned by two "notable names" moving into crypto, as noted by institutional exchange LMAX Digital. 

"BlackRock and Citadel are two of the biggest names mentioned in last week’s headlines around moves in the space," LMAX Digital said in a newsletter, referring to BlackRock's filing for a bitcoin spot ETF and the launch of Citadel-backed EDX Markets. 

The former development has kicked off a flurry of new filings. 

"And in the aftermath of a scare from the SEC a few weeks back, all is looking exceptionally well, as the interest from these larger players projects a confidence in the outlook."

The crypto options market has also seen a surge in activity, with open interest across Bitcoin-tied options topping $11 billion on June 25 — an increase from just over $7.2 billion on May 27.

As per crypto trading firm Genesis, there is a large concentration of calls in the $30,000 to $35,000 range, indicating "positive sentiment among traders with significant activity in bullish near-term structures."