According to @GreeksLive, for August 11–17, 2025, notional block trade volume totaled $763,438,652 ($763.4 million), source: @GreeksLive on X, Aug 18, 2025. According to @GreeksLive, Deribit handled $542.4 million and OKX $221.0 million in block trades over the period, source: @GreeksLive on X, Aug 18, 2025. Based on the reported figures, Deribit accounted for approximately 71.1% and OKX 28.9% of the week's total, with an average daily block volume of about $109.1 million and Deribit volume at roughly 2.45 times OKX, source: calculation from @GreeksLive data on X, Aug 18, 2025.