Most of the Am Law 100 firms with deep roots in the Bay Area’s booming tech economy reported solid gross revenue growth last year, with one exception.

The four that posted gains were Cooley, Orrick, Herrington & Sutcliffe, Wilson Sonsini Goodrich & Rosati and Fenwick & West, which all grew revenue and lawyer head count as the region’s large technology companies continue to drive up demand for legal services.