Trading activity declined at major online brokerages in June.

Daily average revenue trades, or DARTs, at Interactive Brokers Group Inc. dropped by 87,000 to 807,000 in June, while DARTs at TD Ameritrade Holding Corp. fell by 72,000 to 791,000.

However, all of the five online brokerages examined reported an increase in total client assets.

Charles Schwab Corp. does not report monthly trading activity.

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