media.

His successor has plenty to do.

The bank's stock is down more than 11% this year . It has underperformed peers, weighed down by an inconsistent trading division that doesn't mint money the way it used to. Recruitment and retention of top talent remains vital, as does the development of newer lines of business, such as Marcus, Goldman's nascent retail banking venture.

Here's what tops Solomon's to-do list.

Trading division troubles

Solomon's first order of business is to turn around Goldman's trading desk, which collects client fees to buy and sell stocks, bonds, commodities and currencies.

"The trading business is really what has hurt them in the past couple of years," said King Lip, chief strategist at Baker Avenue Asset Management in San Francisco.

The unit made up more than half the bank's revenuecharge of the consumer bank, is stepping into the CFO role. John Waldron, a longtime deputy of Solomon's, will take over as president and chief operating officer.

"The question is: How does his new team jell together?" said Stephen Biggar, an analyst at Argus Research.

Another challenge for Solomon will be attracting and keeping talent at the firm.

Many young professionals have favored Silicon Valley over Wall Street in recent years, as tech companies entice college graduates with competitive pay and relaxed work environments.

Goldman has loosened up, with results to show for it. Roughly two-thirds of employees are Millennials, while more than 25% are engineers.

Still, the company must ramp up diversity efforts that started under Blankfein, Lip said.

Solomon has signaled this is a priority. This summer, more women were added to