Developments in Borsa İstanbul: YEOTK, DOFRB and More

Highlights of the Day on Borsa Istanbul

As of December 23, 2025, we have compiled notable developments on 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 by adding 7.84 million dollars. This development supports the company’s growth targets in the energy sector.

Aksa Enerji (AKSEN)

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

Vakıfbank (VAKBN)

Vakıfbank has signed a new credit agreement worth a total of 300 million dollars with the Asian Infrastructure Investment Bank. The agreement stands out as part of the company’s efforts to expand its financial resources.

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 number of stores in the Gulf region by opening its second corporate store in Qatar at the City Center Shopping Mall in Doha. By the second half of 2025, the total number of corporate stores opened in this region has reached 10.

What’s Happening in Global Markets?

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

Gold and Silver

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

Recent Developments in the Turkish Economy

On Borsa Istanbul, the BIST 100 index is trading at 11,307.24 points, down 0.03%. According to the latest analysis by the Central Bank of Turkey, it has been observed that the reductions in the policy interest rates have reflected on the pricing of credit and deposits in the banking sector.

In the free market, the dollar is traded at 42.82 liras, and the euro at 50.58 liras. The gram gold continues to be traded at around 6,162 TL.

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