Investors cautious as mixed results follow surge in Dow and inflation reports loom.

S&P 500 futures are flat as investors await key inflation reports due later in the week. Palantir jumped more than 20% after hours on a strong earnings report and upbeat guidance, while Lucid, PayPal, and Skyworks were all down in extended trading after their quarterly reports were released. Treasury Secretary Janet Yellen said failing to raise the debt ceiling would be an "economic catastrophe" and that regulators are not close to any policies that would limit short-selling regional bank stocks. Investors may want to look at longer duration issues instead of short-term Treasurys, particularly as debt ceiling chatter heats up.