U.S. stock indexes mostly ticked up as investors assessed early indicators that the Omicron Covid-19 variant may be causing milder illness than previously feared, while bitcoin and other cryptocurrencies edged up from weekend lows.

The S&P 500 rose 0.6% Monday, regaining some ground after closing down 0.8% Friday. The Dow Jones Industrial Average added 1.3%, while Nasdaq Composite edged down 0.2%.