The domestic companies index (DCI) went down marginally by 0.06 percent during the week ending June 15, closing at 8 521.40 points from 8 526.80 points the previous week, as indicated by Stockbrokers Botswana weekly report. For the year-to-date, the index lost 3.82 percent. A total of 9 969 987 securities valued at P57 939 047 were traded during the week.