Investors on edge as inflation reports and earnings season kick off.

The S&P 500 was flat, the Dow picked up 0.2%, and the Nasdaq Composite dipped 0.3% as markets await the release of key inflation data this week, which will signal the Federal Reserve's future monetary policy. Markets are pricing in a 25-basis point interest rate hike in May, followed by a pause in the June meeting. Investors are also eyeing bank quarterly results later this week. The 10-year Treasury yield remained unchanged at 3.41%, while the 2-year yield was up 1 basis point to 4.00%.