** Automated electronic broker Interactive Brokers Group IBKR.O shares fall 9% to $157.87 premarket after Q1 profit miss

** Co reports Q1 adj. earnings of $1.88 per share, falling short of analysts' estimate of $1.92 per share, according to data compiled by LSEG

** IBKR also announces 28% increase in quarterly dividend to 32 cents; 4-for-1 stock split from mid-July

** Piper Sandler lowers price target to $182 from $192 and 2025E/2026E EPS estimates due to lower margin loan balance expectations

** Risks include IBKR revenues being highly dependent on trading volumes and customer balances, brokerage adds

** Current average analyst rating on shares is "buy"; with nine rating "strong buy" or "buy", one "hold" and no "sell" or "strong sell"

** IBKR has recovered about 20% from a 7-month low hit last week

** As of last close, IBKR down 1.76% YTD

(Reporting by Twesha Dikshit)

((Twesha.Dikshit@thomsonreuters.com))