Check out which companies are making headlines after the bell Tuesday:
Comcast - Comcast announced that it will acquire the 49 percent of NBCUniversal it does not already own from General Electric for $16.7 billion. Comcast also reported earnings of 52 cents a share on revenue of $15.94 billion, missing expectations by a penny, on revenue of $15.94 billion versus estimates for $16 billion. The company also increased its dividend by 20 percent to 78 cents a share on an annualized basis and will repurchase $2 billion in stock in 2013. Shares jumped in extended-hours trading. GE also gained in extended-hours trading.
(Read More: Dow, S&P Close at 5-Year Highs; Apple Falls 2%)
Cliffs Natural Resources - The coal company posted earnings of 62 cents a share, excluding one-time items, topping estimates for 53 cents a share. Revenue matched expectations at $1.54 billion. Meanwhile, the company said it expects its global iron ore sales to be flat year over year at nearly 40 million tons and cut its its dividend rate to 15 cents a share from 62.5 cents a share. Shares declined in extended-hours trading.