Arbitron Inc. (NYSE: ARB) went skyward 18.91 percent Thursday to close out trading at $37.22. Volume was 2,315,992, better than 11 times its normal daily average. The Columbia, Md.-based ARB announced Wednesday that Clear Channel Radio has signed multi-year, multi-market contracts for Arbitron’s Portable People Meter™ and diary radio ratings services. These agreements extend Clear Channel’s access to Arbitron radio ratings and other services in all of Clear Channel Radio’s markets through December 31, 2016.

JP Morgan Chase and Co. (NYSE: JPM) inched up 1.37 percent to close Thursday at $40.81. Volume of 40,747,612 shares nosed out its usual daily volume. JPM announced Thursday that its CEO, Claudia Slacik, has been appointed to the board of directors of Martha Stewart Living Omnimedia, Inc.

HDFC BANK Ltd. (NYSE: HDB) saw its stock skid 10.64 percent to close Thursday at $160.78. Volume for the Indian-based bank was 1,315,601, more than six times its usual daily volume.