INVESTOR GROUP CUTS DBA SYSTEMS <DBAS> STAKE A group led by New York investors David Bellet and Chester Siuda said it lowered its stake in DBA Systems Inc to 100,000 shares, or 3.7 pct of the total outstanding, from 170,000 shares, or 6.3 pct. In a filing with the Securities and Exchange Commission, the group said it sold 70,000 DBA common shares between Feb 13 and March 23 at prices ranging from 18.25 to 20.00 dlrs a share. So long as the group's stake in DBA is below five pct, it is no longer required to report its further dealings in the company's common stock.