Check out which companies are making headlines before the bell:
Home Depot — The Dow industrial average component reported better-than-expected fourth-quarter results amid an improving housing market. Home Depot's stock was up about 3 percent in the premarket trading.
Macy's — Shares of the retail giant rose more than 7 percent in premarket trading after the company posted mixed quarterly results. Macy's beat analysts' expectations on revenue, but missed on earnings per share. The company also reported a 4.3 percent decline in same-store sales.
Toll Brothers — The luxury homebuilder posted quarterly earnings per share that were in line with expectations, while beating revenue estimates, as it sold homes at higher prices.
Fitbit — Shares of the wearables maker were down more than 15 percent in premarket trading after the company reported better-than-expected quarterly results, but posted weak forward-looking guidance.
Motorola Solutions — Shares of the radio systems and walkie-talkie maker surged nearly 8 percent in premarket trading after beating expectations on quarterly earnings per share amid fewer expenses. Revenue, however, missed estimates.
Honeywell, United Technologies — United Technologies said in a statement it had talked with Honeywell about "a range of potential collaborative options," but said that "significant regulatory obstacles, customer concerns and valuation issues" led to it not exploring the options further. CNBC reported on Monday that both companies had recently held talks about a merger.
Valeant Pharmaceuticals — The pharmaceutical company said it would restate financial results for 2014 and 2015, identifying some sales to Philidor that should have been recognized when products were dispensed to patients.
Apple, Microsoft — Bill Gates, Microsoft's co-founder, told The Financial Times on Tuesday that technology companies should be forced to cooperate with law enforcement. Gates' remarks were made as tech giant Apple is embroiled in a legal battle over whether or not it should help the FBI in unlocking the iPhone of one of the San Bernardino shooters.