Although the judge dismissed most of the lawsuit, one count that still remains accuses Bain Capital LLC, Kohlberg Kravis Roberts & Co. LP and Merrill Lynch Global Private Equity of collusion in the 2006 $33 billion buyout of hospital operator HCA Inc. Blackstone, Carlyle Group, Goldman, Sachs & Co. and TPG Capital allegedly conspired to back off from placing rival bids for HCA, the plaintiffs have claimed.

Written by Taina Rosa in New York. Chris Nolter contributed to this report.

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