Check out which companies are making headlines before the bell:
UnitedHealth Group — The health insurer earned an adjusted $1.81 per share for the first quarter, 9 cents above estimates, while revenue beat forecasts as well. UnitedHealth also raised its full-year forecast, on strong organic growth and good customer retention levels.
Johnson & Johnson — The medical products maker reported adjusted quarterly profit of $1.68 per share, 3 cents above estimates, with revenue matching forecasts. J&J raised its full-year forecast, which now sits largely above analyst estimates as it sees double-digit U.S. sales growth.
Goldman Sachs — Goldman earned $2.68 per share for the first quarter, beating estimates of $2.45, but revenue was below Street forecasts. Turbulent financial markets for much of the quarter weighed on Goldman's revenue.
Harley-Davidson — The motorcycle maker came in 7 cents above estimates, earning $1.36 per share for its latest quarter. Revenue was also above Street forecasts, and the company maintained its 2016 shipment outlook.
Philip Morris International — The tobacco company fell 13 cents shy of estimates, with adjusted quarterly profit of 98 cents per share, while revenue was below analysts' projections, as well. The company said the bottom line impact of unfavorable currency trends was 19 cents per share during the quarter.
Panera Bread — Jefferies upgraded the restaurant chain's shares to "buy" from "hold," on rising comparable store sales and a broadening consumer reach for the brand.
Liberty SiriusXM, Liberty Media — FBR rates both of these newly formed Liberty Media tracking stocks as "outperform," following their Monday debut. FBR said both stocks are trading a "meaningful discounts" to their "sum-of-the-parts" values.
IBM — The computer services giant reported adjusted quarterly profit of $2.35 per share, above estimates of $2.09, with revenue slightly above Street forecasts. However, overall profits and revenue were lower than a year ago, as IBM tries to grow its new businesses fast enough to offset declining revenue from older ones.
Netflix — Netflix beat estimates by 3 cents with quarterly profit of 6 cents per share, while the video streaming service's revenue was in line with forecasts. However, shares are under pressure after Netflix gave weaker than expected subscriber guidance for the current quarter.
Wells Fargo — Wells Fargo has been named a "primary dealer" by the Federal Reserve Bank of New York, becoming the 23rd bank that trades directly with the New York Fed.
Illumina — Illumina said it expects to announce first quarter revenue of about $572 million, below consensus estimates of about $596 million. The maker of gene-sequencing instruments points to disappointing results in Europe and lower than expected sales of certain devices.
Rambus — Rambus reported adjusted quarterly profit of 13 cents per share, beating estimates by 1 cent, while revenue was in line with forecasts. But the chip technology licensing company gave a second quarter outlook short of analyst forecasts, as costs rise and revenue from patent royalties falls.
Anheuser-Busch InBev — The beer brewer accepted an offer from Japan's Asahi Group for Peroni and a number of other beer brands owned by SABMiller. Anheuser-Busch is in the process of buying SABMiller for more than $100 billion, and the sale is part of its plan to win regulatory approval.
United Parcel Service — UPS could be near a contract impasse with its pilots, according to the union representing that group. Federal mediators will likely decide soon whether a stalemate has occurred, a decision that could begin a 30-day cooling off period that would then allow a strike to take place.
Spirit Airlines — Spirit reported better than expected first quarter revenue, although the key metric of revenue per available seat mile fell 14 percent during the quarter. Spirit said fares still remain low in the markets it served.