And then there was one . . .


Well two, if you count Apple. From the "suit" department:

Penguin has agreed to a settlement with the U.S. Department of Justice to resolve the issue of alleged ebook price-fixing in preparation for its merger with Random House.
The terms of the settlement are similar to those agreed to by Hachette, HarperCollins and Simon & Schuster. The Department of Justice will continue with its lawsuit against Apple and Macmillan, which have declined to settle.

Story.

The move was probably inevitable, given Penguin's plans to merge with Random House.