Ekonomi Borsa Istanbul down at close of day Yazan: Alaturka US - Haziran 22, 2016 FacebookTwitterPinterestWhatsApp ISTANBUL (AA) – Borsa Istanbul’s BIST-100 index slipped 0.34 percent at close of the daily session on Wednesday , June 22, 2016. The benchmark index lost 263.92 points to 77,267.46.