UPDATE 3-Goldman Sachs' Schwartz retires, paves way for Solomon as next CEO

(Adds background on Schwartz, details on succession planning, Breakingviews link)

March 12 (Reuters) - Goldman Sachs Group Inc said on Monday that Harvey Schwartz will retire from the bank, leaving David Solomon as sole president and chief operating officer and the most obvious successor to Chief Executive Lloyd Blankfein.

The bank did not say why Schwartz was retiring. He and Solomon were named co-COO in December 2016 in a setup that appeared to pit the two against each other to eventually lead what is viewed as the most powerful U.S. investment bank.

The Wall Street Journal had reported on Friday that Blankfein, 63, was expected to retire as soon as this year and the bank was not looking beyond Schwartz and Solomon to replace him. Goldman did not comment on that report.

The unexpected announcement that Schwartz will retire eliminates a presumptive CEO candidate with a strong trading background and comes as Goldman Sachs has been trying to reinvent itself after market trends and regulations sapped profits from its once-lucrative trading business.

Schwartz, 53, will leave on April 20. He had been co-head of the bank's trading division before being promoted to chief financial officer in 2013, while Solomon, 56, had been a co-head of investment banking at Goldman since 2006 until becoming co-COO.

In September, Schwartz had outlined a target to grow revenue by $5 billion a year, after investors pressured the bank to be more transparent about its strategy outlook after two quarters of weak trading results.

The bank typically maps out its succession planning by naming two or three candidates to top roles. Schwartz and Solomon were named to the co-COO roles after Gary Cohn left Goldman to become U.S. President Donald Trump's chief economic adviser.

Cohn said last week he would resign, a move that came after he lost a fight over Trump's plans for hefty steel and aluminum import tariffs.

Goldman shares rose nearly 1.4 percent to hit a lifetime high in morning trade.

Analysts viewed Schwartz's retirement as a positive for the bank because it clarified the succession planning and appeared to remove the possibility of the bank having co-CEOs.

(Reporting by Parikshit Mishra in Bengaluru and Catherine Ngai in New York; Writing by Meredith Mazzilli; Editing by Bernard Orr and Nick Zieminski)