IShares Bitcoin Trust call options volume hits record 1.58M contracts

The options market just delivered its clearest bullish signal on Bitcoin in months. Call options volume on BlackRock’s iShares Bitcoin Trust (IBIT) exploded to 1.58 million contracts in a single session, setting a new all-time record for the spot Bitcoin ETF.

What the numbers actually show

The record was flagged by Goldman Sachs, which also noted that the 3-day call skew on IBIT surged by 0.05. That’s the largest jump in that metric since January 2025.

Call skew measures how much more traders are willing to pay for upside calls versus downside puts. A 0.05 move in three days isn’t subtle, it’s the options market equivalent of the entire room leaning forward at once.

Goldman’s data also characterized the session as notably “call-heavy,” grouping IBIT alongside GLD, the SPDR Gold Shares ETF, as standout examples of aggressive bullish positioning on that day.

Why IBIT has become the go-to Bitcoin bet

BlackRock’s spot Bitcoin ETF has quietly cemented itself as one of the largest Bitcoin-linked products by assets in the US market. Since its launch alongside other spot Bitcoin ETFs in January 2024, IBIT has consistently attracted the lion’s share of institutional inflows, particularly during periods when Bitcoin’s price is recovering or showing momentum.

What’s telling about this particular surge is that the activity was concentrated on the call side rather than spread across puts and calls. In a hedging-dominated environment, you’d expect to see more balanced activity, with portfolio managers buying puts to protect their existing IBIT holdings. Instead, the lopsided call volume suggests traders were actively seeking new exposure, not protecting what they already had.

What this means for Bitcoin sentiment

There’s a reflexive element to this kind of activity. Heavy call buying forces options market makers to delta-hedge by purchasing the underlying asset. In plain terms, when traders buy massive amounts of IBIT calls, the dealers on the other side of those trades often need to buy IBIT shares to stay neutral. That buying pressure can, in turn, push the ETF’s price higher, which increases demand for more calls.

For the competitive landscape among Bitcoin ETF issuers, IBIT’s dominance in options volume reinforces its position as the institutional product of choice. Rival funds from Fidelity, ARK, and others have carved out their own niches, but when it comes to derivatives activity, BlackRock’s offering continues to pull away from the pack.

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