The "Halftime Report" traders gave their trades with about three hours until Friday's market close.
Jon Najarian was a buyer of airline leasing company AerCap Holdings due to 'unusual activity.'
Michael Block was watching the S&P Metals & Mining ETF.
Tyler Vernon was looking at CyrusOne.
Jim Lebenthal had his eye on Marathon Petroleum.
Trader disclosure: On May 1, 2015, the following stocks and commodities mentioned or intended to be mentioned on CNBC's "Fast Money" were owned by the "Halftime Report" traders: Jon Najarian is long ABT, ADP, ADT, AER, AMZN, BBY, BSX, BURL, EQT, EVEP, EXXI, FEYE, GE, HSBC, HUN, HZNP, IMAX, MAS, MCD, MDRX, MRVL, MW, NEE, NRG, OAS, OC, PG, POST, RHT, SBUX, SCTY, SIMO, SIRI, SKX, SOL, SYK, TEVA, TTWO, TLT, TWX, WMB, XLI, YPF, ZIOP, he is long calls AKS, APD, BABA, BBY, CTXS, EQT, EVEP, EWJ, FB, GE, GES, GREK, GRPN, GSK, GTI, IDTI, IMAX, LNKD, MCD, MDRX, MET, MYL, NTAP, NUAN, OAS, PG, PPC, PRU, RAD, SAP, SIMO, SKX, SNDK, TAP, TWX, VALE, XLK. Today he bought AER, GTI calls, and VALE calls. 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. Tyler Vernon's firm is long CONE, NKE, V.
Stifel Nicolaus Analyst Scott Devitt: Stifel maintains a business relationship with Amazon.com, Inc.. Prior to August 12, 2014, a different Stifel research analyst provided research coverage of Amazon.com, Inc. Stifel or an affiliate is a market maker or liquidity provider in the securities of Alibaba Group Holding Limited.