Bloomberg A US regulator is looking at whether auto finance companies that use sophisticated technology like ignition kill switches are illegally harassing subprime borrowers that have fallen behind on their payments. The Federal Trade Commission, a consumer protection agency, has asked for information from at least two lenders, according to securities offering documents from both companies this month obtained …

  Bloomberg T-Mobile US Inc. rose as much as 5.3 percent following a report that SoftBank Group Corp. would be willing to give up control of Sprint Corp. if it would help cement a potential merger of the two mobile-phone carriers. SoftBank can’t yet talk to T-Mobile’s parent company, Deutsche Telekom AG, because of a gag rule related to an …

  Bloomberg Toshiba Corp., seeking to make up for a huge writedown in its nuclear-equipment unit, finally took the drastic step of putting its crown jewel — its chip business — up for sale. Finding a buyer might prove to be even more difficult. The Tokyo-based conglomerate had been entertaining offers for a minor stake in the flash-memory operations, until …