"It is very difficult for these companies to operate in a near zero-revenue environment," Sudeep Kesh, head of credit market research at S&P Global Ratings, was quoted as saying in the report.
"They are facing a lot of pressure."
During the last financial crisis, there were 8,614 company bankruptcies in the US in 2008, and the number rose to 12,644 in 2009, according to the report.
The report came as the Paycheck Protection Program (PPP), a US government aid program intended to help small businesses retain their employees during the COVID-19 crisis, was set to close on Tuesday with more than $130 billion left unused.
Treasury Secretary Steven Mnuchin said on Tuesday that President Donald Trump's administration supports legislation to repurpose the remaining funds in the PPP.
"I've already had conversations with the SBA (Small Business Administration) committee in the Senate about repurpose that 135 billion dollars, and think that should be done, and look forward to working with both the House and the Senate so that we can pass legislation by the end of July," Mnuchin said at a hearing before the House Financial Services Committee.
The aim should be "extending it to businesses that are most hard hit, that had a requirement that their revenues have dropped significantly, things like restaurants and hotels and others where it is critical to get people back to work", he added.
The PPP was conceived as a lifeline to small businesses shuttered by the pandemic, but it also faced criticism as some big publicly traded companies secured millions of dollars of loans.
Amid mounting pressure from lawmakers and the public, the Treasury Department and the SBA said earlier this month that they would disclose information about businesses that take PPP loans of $150,000 or more.