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Interactive brokers actually publishes its numbers every month. Currently at a mere 630k accounts. But a whopping $150 Billion in Client Equity, and the other metric this industry uses is DARTs or daily average revenue generating trades, which is close to 800k. Robinhood probably sells most of its flow to HFTs at lower than what IB charges on commissions and IB is valued at 3x or $22B


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