The "Halftime Report" traders focused on this week's earnings during their top trades.
Joe Lebenthal told investors to pay attention to General Motors.
Trader disclosure: On April 20, 2015, the following stocks and commodities mentioned or intended to be mentioned on CNBC's "Fast Money" were owned by the "Halftime Report" traders: Josh Brown is long AAPL, CME, DE, DGRE, DIS, DNKN, FCX, FSLR, GBX, MBLY, SAM, SHAK, SPWR, TNET, TWTR, VWO, XLE, XON. Joe Terranova is long VRTS. Jim Lebenthal is long AAPL, BP, C, DCO, EEQ, GAIA, GM, IBM, INTC, JCP, MPC, OA, ORBC, PFE, QCOM, SJT, SPLS, TGT, TIF, TRMB, WGO.