The nation’s largest public pension fund said Tuesday it is suing the New York Stock Exchange and its seven specialist firms for collaborating to fleece investors over the last five years.

The California Public Employees Retirement System (CalPERS) alleges the exchange knowingly allowed specialists to manipulate the trading process to reap bigger profits for themselves and cheat investors out of the best stock prices. The lawsuit requests the district court consolidate other class action suits and designate CalPERS lead plaintiff on behalf of all harmed shareholders. A bulk of the companies in its $60 portfolio are traded on the NYSE by representatives from Goldman Sachs.

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