The "Halftime Report" traders focused on this week's earnings during their top trades.
Joe Terranova is watching activity in Facebook, Halliburton, Blackstone and Texas Instruments.
Josh Brown highlighted Yahoo and Under Armour.
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.
