The BIST 100 index ended Monday at 12,150.67 points, down 115.3 points, or 0.94%, from the previous close. Total trading volume on the stock exchange reached 81.5 billion liras.
Sector indexes
At the end of the day, the banking index gained 0.56%, while the holding companies index fell 0.75%.
Among the sector indexes, securities posted the strongest gain, rising 0.93%. Financial leasing and factoring recorded the steepest decline, falling 5.17%.
Data and technical levels to watch
Analysts said balance of payments statistics due to be released domestically on Tuesday would be closely watched. Internationally, Japan's September Producer Price Index, Germany's September Consumer Price Index, weekly employment changes in the United States and September existing-home sales will be monitored.

Technically, 12,200 and 12,100 points were assessed as support levels for the BIST 100 index, while 12,300 and 12,400 points were identified as resistance levels.
Current account expectations
Economists expect the current account to post a surplus of $3.5029 billion in August. They forecast a $48 billion current account deficit for the year.
According to data announced by the Central Bank on Tuesday, the current account posted a surplus of $4.053 billion in August, exceeding expectations.