UPS slashed its earnings forecast for the year as it spends to boost capacity ahead of the holiday shopping season.
Merck reported better-than-expected results, with sales of newer drugs offsetting declining sales of drugs facing generic competition.
Pfizer reported higher-than-expected second-quarter earnings, helped by growing sales of its cancer medicines.
Herbalife slumped after quarterly results missed estimates. Revised revenue guidance was also below projections.
Get the best of CNBC in your inbox