By Justin Baer 

Morgan Stanley's chief financial officer, Ruth Porat, will leave the Wall Street firm for the same role at technology giant Google Inc.

Jonathan Pruzan, a 46-year-old investment banker who co-led the team that advises banks and other financial-services companies, will succeed Ms. Porat as Morgan Stanley's finance chief, James Gorman, chairman and chief executive, wrote Tuesday in a memorandum to employees.

"After a 28-year career at Morgan Stanley, Ruth Porat has decided to leave the firm to take on a new role in Silicon Valley and return to her California roots," Mr. Gorman wrote. "It is with a heavy heart that we see her go."

Morgan Stanley shares edged down 0.3% in early trading, while Google climbed 1.8%.

Ms. Porat grew up in California and earned a degree from Stanford University, and during an earlier stint at Morgan Stanley served as co-head of investment-banking to technology companies.

She helped bring technology and Internet companies public during the 1990s. Clients included Priceline.com Inc., eBay Inc. and Amazon.com. She also worked the initial public offering of onetime GE subsidiary Genworth Financial Inc. in 2004

Ms. Porat spent the past five years as finance chief and leaves as Morgan Stanley settles into a steadier place than at any point since the financial crisis. In her role as finance chief, Ms. Porat had helped Mr. Gorman shrink the firm's balance sheet, shed some of its riskiest activities, and double-down on a wealth-management division that promises stable profits.

Her move traces a well-worn path. Wall Street executives at all levels, from its most junior employees to some of its brightest stars, have migrated to Silicon Valley in recent years as new rules on everything from capital and risk-taking to compensation dim the prospects of a financial-services industry that was once the top destination for the ambitious.

A veteran mergers-and-acquisitions banker ahead of her appointment as finance chief, Ms. Porat advised on some of firm's highest profile assignments, including the government takeovers of Fannie Mae and Freddie Mac.

Ms. Porat also was previously a candidate to be the deputy Treasury secretary but told the Obama administration about two years ago that she wasn't interested in the position. The Wall Street Journal previously reported that her interest declined in the role, which required Senate confirmation, after she saw the grilling Treasury Secretary Jacob Lew received about his years working on Wall Street, his investments during that time and his pay.

Google, meanwhile, said Ms. Porat will start as chief financial officer on May 26.

Google disclosed earlier this month that Patrick Pichette, its finance chief since 2008, was going to retire from the company. The company had said he would stay while Google conducted a search for his replacement.

His departure added to a run of CFO turnover in Silicon Valley. Finance chiefs of Apple Inc., Facebook Inc. and Amazon.com Inc. all announced their departures in the past year. Unlike Google, those three companies named successors at the same time the retirements were announced.

Write to Justin Baer at justin.baer@wsj.com

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