Turkey's benchmark stock index dropped by 1.06%, or 1,048.24 points, to start the first transaction day of the week at 97,979.58 points.
On Friday, Borsa Istanbul's BIST 100 index increased by 0.25% to close the day at 99,027.82 points with a daily trading volume of 8.02 billion Turkish liras ($1.37 billion).
The U.S. dollar/Turkish lira exchange rate rose to 5.9040 as of 9.30 a.m. local time (0630GMT) on Monday, compared to 5.8620 at Friday's close.
The euro/Turkish lira exchange rate also increased to 6.5150, versus 6.4810, and one British pound traded for 7.4400 Turkish liras, while it was 7.4540 at the previous close.
One barrel of Brent crude oil was sold for around $59.80 as of 10 a.m. local time (0700GMT) on Monday.
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