Investors largely shrugged off a downgrade of the U.S.'s credit rating in Monday trading as stocks ended the day mostly flat.

All three major U.S. stock market indexes rose Monday afternoon, following an earlier selloff sparked by long-dated Treasury yields surpassing the 5% mark after the financial ratings agency Moody’s downgraded the U.S. government’s credit rating late last week, citing rising debt and interest payment ratios.