Istanbul Stock Exchange Developments: YEOTK, DOFRB and More

Highlights of the Day in Borsa Istanbul

As of December 23, 2025, we have compiled noteworthy developments in Borsa Istanbul. Here are the company news that closely affect the markets.

Yeo Technology (YEOTK)

Yeo Technology increased the contract amount for the solar power plant installation services agreement it made with Yazıcı Demir Çelik from 66 million dollars + VAT to 73.84 million dollars + VAT, raising it by 7.84 million dollars. This situation supports the company's growth targets in the energy sector.

Aksa Energy (AKSEN)

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

Vakıfbank (VAKBN)

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

Gülermak (GLRMK)

Gülermak 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% wholly-owned subsidiary, Gülermak Renewables Deutschland Holding. The total sale price was determined to be 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 reached 10.

What’s Happening in Global Markets?

In global markets, optimism toward technology companies continues to grow. Risk appetite remains high in the stock markets with year-end rally expectations. Focus is on the growth data to be released in the USA.

Gold and Silver

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

Recent Developments in the Turkish Economy

The BIST 100 index in Borsa Istanbul is trading at 11,307.24 points, down 0.03%. According to the latest analysis by the Central Bank of the Republic of Turkey, the effects of interest rate cuts are observed 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 at 50.58 lira. The gram gold is continuing to trade around 6,162 TL.

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