According to @StockMKTNewz, Interactive Brokers (IBKR) now has 4.1 million total accounts, up from 1 million in the same quarter in 2020 (source: @StockMKTNewz on X, Oct 18, 2025). This implies roughly 310% cumulative growth over five years based on the reported figures, calculated from 1.0 million to 4.1 million (source: calculation based on @StockMKTNewz). IBKR offers cryptocurrency trading, including BTC and ETH, meaning a larger client base can access these markets via the platform where available (source: Interactive Brokers, Cryptocurrencies product page).