U.S. companies rebounded from a lackluster showing in the first quarter of the year with a surge in profits that's expected to fuel even more economic growth in the months ahead. Among the 20 companies with the biggest year-over-year change, six come from the Bay Area with four of those headquartered in Silicon Valley.
The Commerce Department reported that after-tax profits among U.S. companies jumped 16.1 percent on a year-over-year during the quarter that ended June 30, qualifying as the largest…