The BIST 100 index at Borsa Istanbul started the day at 12,161.15 points, up 10.48 points, or 0.09 percent, from the previous close.
The index had ended the previous trading day at 12,150.67 points after losing 0.94 percent.
Sector indices show a mixed picture
At the opening, the banking index gained 0.41 percent, while the holding companies index fell 0.31 percent.
Among the sector indices, sports recorded the biggest increase, rising 0.57 percent. The financial leasing and factoring index fell 4.73 percent, recording the biggest decline among the sectors.
Data and global developments remain on markets' agenda
Global markets are following a mixed course amid rising geopolitical tensions in the Middle East and declines in technology stocks.

Domestically, balance of payments statistics will be monitored, while abroad, the ADP weekly private-sector employment data and existing home sales to be released in the United States will be followed.
Support and resistance levels for the BIST 100
In technical assessments, the 12,300 and 12,400-point levels stand out as resistance for the BIST 100 index, while 12,000 and 11,900 points are seen as support.
Economists participating in the Balance of Payments Expectations Survey expect the current account to post a surplus of $3.5029 billion in August. Economists forecast a $48 billion current account deficit for this year.
Following the opening, balance of payments data released by the Central Bank showed that the current account posted a surplus of $4.053 billion in August, exceeding economists' expectations.