US equity indexes traded mixed after midday Monday as government bond yields rose and crude oil fell.

The Nasdaq Composite rose 0.7% to 27,385.2, the S&P 500 climbed 0.5% to 7,760.9, while the Dow Jones Industrial Average slipped less than 0.1% to 51,165.2.

In economic news, the Institute for Supply Management's US services index fell to 54.9 in September from 55.4 in August, compared with expectations for 55.0 in a survey compiled by Bloomberg. The ISM's reading indicates slower expansion. Regional services data were mixed.

The S&P Global US services index rose to 58.8 in September from a 58.7 flash reading, up from the 56.5 reported in August, compared with expectations for no revision in a survey compiled by Bloomberg. The September index is higher than the 56.5 reported in August.

US Treasury yields rose, with the mid-to-long end outpacing shorter maturities, steepening the yield curve. The 30-year rate surged 6.1 basis points to 5.69%, its highest since 2002. The 10-year yield jumped 5.7 basis points to 5.33%, its strongest level since 2002. The 2-year yield rose 1.6 basis points to 4.84%.

The front-month US West Texas Intermediate crude oil contract slipped 1% to $90.18 per barrel, and the global benchmark North Sea Brent edged 1.1% lower to $101.16 per barrel.