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 for you. Here are the company news that closely concern the markets.

Yeo Technology (YEOTK)

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

Aksa Energy (AKSEN)

Aksa Energy's subsidiary Aksa Renewable Energy signed a turbine supply contract with Goldwind International and Goldwind Turkey for a planned storage wind energy plant project in Mersin, which will have an installed capacity of 100.08 MW. This project is an important step towards increasing renewable energy sources.

Vakıfbank (VAKBN)

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

Gülermak (GLRMK)

Gülermak signed a conditional share purchase agreement to acquire 100% of the shares belonging to Orrön Klein Teetzleben, Orrön Javenitz, and Orrön Trebenow through its 100% owned subsidiary Gülermak Renewables Deutschland Holding. The total sales 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 Mall in Doha. By the second half of 2025, the total number of corporate stores opened in this region will reach 10.

What’s Happening in Global Markets?

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

Gold and Silver

As of Tuesday, gold reached a record level approaching 4,500 dollars per ounce, while silver also saw record levels at 69.98 dollars.

Latest Developments in the Turkish Economy

At Borsa Istanbul, the BIST 100 index is trading at 11,307.24 points, down by 0.03%. According to the latest analysis by the Central Bank of Turkey (TCMB), it has been observed that the reductions in policy interest rates 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, and the euro is trading at 50.58 lira. The 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 short-term market fluctuations.