IMA Holdings Corp., the group formed to...

IMA Holdings Corp., the group formed to acquire American Medical International Inc., has extended its $28-a-share cash tender offer until Aug. 23. IMA Acquisition Corp. stated that as of Aug. 7, it had received tenders for about 6.7 million shares of American Medical International Inc. . . . McCaw Cellular Communications announced that it has extended for three weeks its $110-a-share cash tender offer for Lin Broadcasting . . . Xerox Corp. announced that it had agreed to pay $68 a share to buy back about 11.5 million shares of its own stock, for a total of $785 million.