The Silent War: Book III of The Asteroid Wars by Ben Bova, Amanda Karr, Christian Noble

The Asteroid Wars continue
When corporations go to war, standard business practice goes out the window. Astro Corporation is led by indomitable Texan Pancho Lane, Humphries Space Systems by the rich and ruthless Martin Humphries, and their fight is over nothing less than resources of the Asteroid Belt itself. Fighting escalates and the lines between commerce and politics, boardroom and bedroom, blur—and the keys to victory will include physics, nanotechnology, and cold hard cash.
It’s a breakneck finale that can end only in earth’s salvation—or the annihilation of all that humankind has ever accomplished in space.