The Wall Street Journal reported in March that Blankfein, 63, would depart as early as this year. Blankfein tweeted in response that it was the newspaper's announcement, "not mine." Solomon said last month in a CNBC interview that there was no timeline for succession.
"I don't think it's a huge surprise," said Brian Kleinhanzl, a bank analyst at Keefe Bruyette & Woods, adding it's "aligned" with previous expectations.
The bank has already felt the ripple effects of the expected succession. Schwartz left the firm in April after serving as co-president with Solomon since Gary Cohn's departure in 2016.
Goldman said this week that two of its three trading co-heads, Pablo Salame and Isabelle Ealet, will leave the firm next month.
Jake Siewert, a spokesman for New York-based Goldman Sachs, didn't immediately return a call for comment. "The simple fact is that no decisions have been made," he told the New York Times.
Goldman Sachs shares were down 0.8 per cent at 2:55 p.m. in New York.