Thomas C. DeFilipps

WS Investment Management Co. (WS Investment) is a private equity firm, a subsidiary of Wilson Sonsini Goodrich & Rosati Professional Corp. founded in 1978 by Larry W. Sonsini. The firm is headquartered in Palo Alto, California.

Wilson Sonsini Goodrich & Rosati PC provides legal services. Its services include corporate law and governance, public and private offerings of equity and debt securities, mergers and acquisitions, securities class action litigation, intellectual property litigation, antitrust counseling and litigation, joint ventures and strategic alliances, technology licensing and other intellectual property transactions, tax, and employee benefits and employment law. The company was founded in 1961 and is headquartered in Palo Alto, CA.