Istanbul's BIST 100 exchange fell 396.67 points Friday to open at 107,403.75 points, a 0.37 percent drop.
The banking and holding sectors fell 0.39 and 0.6 percent respectively. Shares in the transport sector saw the greatest increase, rising 0.36 percent. The leasing sector dropped most, falling 0.88 percent.
The market closed at 107,800.42 points on Thursday after dropping 0.84 percent during the day.
The U.S. dollar/Turkish lira exchange rate rose to 3.5450 at 9.30 a.m. local time (0630GMT) Friday, compared to 3.5320 at Thursday's close.