According to Eric Balchunas, IBIT options open interest has reached $38 billion and IBIT has surpassed Deribit as the largest venue for bitcoin options (source: Eric Balchunas on X, Oct 2, 2025). According to Eric Balchunas, this underscores that ETFs are materially impacting options activity and that "fat crypto margins" are in trouble (source: Eric Balchunas on X, Oct 2, 2025). According to Eric Balchunas, the data point was surfaced by Sidharth Shukla (source: Eric Balchunas on X, Oct 2, 2025).