I wish I could recommend C. J. Cherryh's Company Wars books, especially
Merchanter's Luck,
Tripoint, and
Finity's End.
Unfortunately like most of her work they not yet available as ebooks. The only ones that are so far, Heavy Time and Hellburner, are sort of prequels set in an earlier time frame to the main series. Still excellent books, but don't feature the merchanteers and Mazianni (regegade military turned pirates) of the later period.