An investment group including Trans World Airlines and its chairman, Carl C. Icahn, said it has raised its stake in Ozark Holdings, parent company of Ozark Airlines, to 16.62% of the firm's outstanding shares . . . Ex-Cell-O will buy the compressor components division of Cleveland-based TRW for a price to be determined within two months, the companies reported . . . Software Publishing announced its decision to remove copy protection from all future software programs and any new releases of current software programs . . . System Integrators of Sacramento said it will increase its current 450-person work force by 25% within six months . . . American Express announced that it has completed the previously announced repurchase of 10 million common shares at an average price of $56.96 per share . . . China's industrial growth slowed to a moderate 4.4% in the first quarter of 1986, Chinese officials report.