IBM and Apple were still the market leaders in retail personal microcomputer sales during the second quarter of 1986, ranking number 1 and number 2 respectively. However their market shares dropped from 40 percent to 34 percent for IBM and from 18 percent to 12 percent for Apple compared with the same period last year. This year's market shares for the next three highest companies were 8 percent for Compaq, and 6 percent each for Epson and Hewlett- Packard.