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Borsa İstanbul BIST 100 index closes week with 4.44% loss
Borsa İstanbul's BIST 100 index experienced a significant downturn during the week of October 12-16, 2026, closing with a 4.44% loss at 11,721.72 points. Throughout the week, the index fluctuated between a low of 11,653.38 and a high of 12,291.17.
Individual stock performance varied widely. 1000 Yatırımlar Holding (BINHO) was the week's largest decliner, dropping 26.32%, followed by Tekfen Holding (TKFEN) at 23.77%. Conversely, Akfen Yenilenebilir Enerji (AKFYE) was the top performer with a 2.89% gain. Other notable gainers included IC Enterra Yenilenebilir Enerji and Sabancı Holding.
In terms of institutional activity, Bank of America (BofA) recorded net sales of 1.7 billion TL, with Bim Birleşik Mağazalar (BIMAS) seeing the highest volume of sales at 1.6 billion TL.
While the stock market faced pressure, gold prices saw slight increases, with 24-karat gold bullion rising 0.05% to 6,648 lira. ASELSAN maintained its position as the company with the highest market value in Borsa İstanbul, valued at approximately 1.55 trillion lira.
Entities
1000 Yatırımlar Holding · ASELSAN · BIST 100 · Bank of America · Borsa İstanbul · MSCI · S&P · Turkey
Claims
What the coverage asserts, and how many sources carry each claim.
- [● 3 SOURCES] 1000 Yatırımlar Holding (BINHO) was the week's biggest loser, dropping 26.32%. www.aydinlik.com.tr · www.borsaningundemi.com
- [○ 1 SOURCE] Bank of America customers completed the day with 1.7 billion TL in net sales.
- [● 3 SOURCES] The BIST 100 index closed the week with a 4.44% loss, ending at 11,721.72 points. www.aydinlik.com.tr · www.borsaningundemi.com
- [○ 1 SOURCE] The price of 24-karat gold bullion rose by 0.05% to 6,648 lira.
- [● 3 SOURCES] Akfen Yenilenebilir Enerji (AKFYE) was the top performer of the week, gaining 2.89%. www.aydinlik.com.tr · www.borsaningundemi.com
- [○ 1 SOURCE] Bim Birleşik Mağazalar (BIMAS) saw the highest sales from BofA, totaling 1.6 billion TL.
- [● 3 SOURCES] During the week, the index reached a low of 11,653.38 and a high of 12,291.17 points. www.aydinlik.com.tr · www.borsaningundemi.com
- [○ 1 SOURCE] ASELSAN was the company with the highest market value at approximately 1.55 trillion lira.