Istanbul Stock Exchange Developments: YEOTK, DOFRB and More

Highlights of the Day in Borsa Istanbul

As of December 23, 2025, we have compiled significant developments in Borsa Istanbul for you. Here are the company news that closely interest the markets.

Yeo Technology (YEOTK)

Yeo Technology has increased the value of its solar power plant installation service contract with Yazıcı Demir Çelik from 66 million dollars + VAT to 73.84 million dollars + VAT by raising it by 7.84 million dollars. This situation supports the company’s growth goals in the energy sector.

Aksa Energy (AKSEN)

Aksa Energy's subsidiary Aksa Renewable Energy has signed a turbine supply contract with Goldwind International and Goldwind Turkey for a 100.08 MW power storage wind energy plant project planned to be built in Mersin. This project is an important step towards increasing renewable energy sources.

Vakıfbank (VAKBN)

Vakıfbank has signed a new loan agreement worth a total of 300 million dollars with the Asian Infrastructure Investment Bank. The agreement stands out as part of the firm's efforts to broaden its financing sources.

Gülermak (GLRMK)

Gülermak has signed a conditional share purchase agreement to acquire 100% of the shares owned by Orrön Klein Teetzleben, Orrön Javenitz, and Orrön Trebenow through its 100% indirect subsidiary Gülermak Renewables Deutschland Holding. The total sale price has been set at 11.23 million euros.

Koton (KOTON)

Koton continues to increase its store count in the Gulf Region by opening its second corporate store in Qatar at the City Center shopping mall in Doha. The number of corporate stores opened in this region has reached a total of 10 in the second half of 2025.

What's Happening in Global Markets?

In global markets, the optimism towards technology companies continues to grow. In stock markets, risk appetite remains high with year-end rally expectations. Attention is focused on the growth data to be announced in the US.

Gold and Silver

As of Tuesday, gold has reached a record level, approaching the $4,500 per ounce mark, while silver has also seen record levels at $69.98.

Recent Developments in the Turkish Economy

The BIST 100 index in Borsa Istanbul is trading at 11,307.24 points, with a decrease of 0.03%. According to the latest analysis by the Central Bank of the Republic of Turkey (TCMB), it has been observed that the reductions in the policy rate are reflected in the pricing of credit and deposits in the banking sector.

In the free market, the dollar is trading at 42.82 liras, while the euro is trading at 50.58 liras. Gram gold continues to trade around 6,162 TL.

These developments provide an important roadmap for investors and market participants. You can determine your investment strategies considering short-term market fluctuations.