Several brokerage firms have been sued by clients who claim they've been underpaid for parked cash.
David Gentile and Jeffry Schneider were found guilty by a federal jury of defrauding more than 10,000 investors.
Another client has sought a class action suit against LPL, saying he was underpaid for cash sweep accounts.
Prosecutors said Ronald Diaz scammed an elderly client out of $867,000 that was supposed to be used for annuities.
The two firms are often fighting for each other's reps. Now Ameriprise says LPL has gone too far.
The suit follows one against LPL. Both firms said in earnings calls last week they weren't changing rates.
The Wisconsin team has taken at least $30 million in client assets out the door, according to Prudential's suit.
While other firms have raised rates on parked money, the broker-dealer said it doesn't understand the hubbub.
State regulators said the late rep had swindled $4.5 million from clients over 30 years.
Christopher T. Wendel cheated clients out of $1.2 million, authorities said.