Istanbul Stock Exchange Developments: YEOTK, DOFRB, and More

Highlights of the Day at Borsa Istanbul

As of December 23, 2025, we have compiled notable developments at Borsa Istanbul. Here are the company news that closely interest the markets.

Yeo Technology (YEOTK)

Yeo Technology has increased the amount of its contract for solar power plant installation services with Yazıcı Demir Çelik from 66 million dollars + VAT to 73.84 million dollars + VAT by adding 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 planned 100.08 MW storage wind energy plant project in Mersin. This project marks an important step towards increasing renewable energy sources.

Vakıfbank (VAKBN)

Vakıfbank has signed a new credit agreement totaling 300 million dollars with the Asian Infrastructure Investment Bank. The agreement stands out as part of the company's efforts to expand its financing sources.

Gülermak (GLRMK)

Gülermak has signed a conditional share purchase agreement to acquire 100% of the shares of 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 number of stores in the Gulf Region by opening its second corporate store in Qatar at the City Center Shopping Mall in Doha. The total number of corporate stores opened in this region has reached 10 in the second half of 2025.

What's Happening in Global Markets?

In global markets, the positive sentiment towards technology companies continues to grow. Risk appetite remains high with expectations of a year-end rally in stock markets. The focus is on the growth data to be announced in the USA.

Gold and Silver

As of Tuesday, gold has risen to record levels, approaching 4,500 dollars per ounce, while silver has also seen record levels at 69.98 dollars.

Recent Developments in the Turkish Economy

The BIST 100 index at Borsa Istanbul is trading at 11,307.24 points, down 0.03%. According to the Central Bank of Turkey's latest analysis, it has been observed that the reductions in the policy interest rate are reflected in the pricing of loans and deposits in the banking sector.

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

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