Developments on Borsa Istanbul: YEOTK, DOFRB, and More

Highlights of the Day on Borsa Istanbul

As of December 23, 2025, we have compiled noteworthy developments on Borsa Istanbul. 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 + VAT to $73.84 million + VAT, raising it by $7.84 million. This situation supports the company's growth objectives 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 energy storage wind power plant project in Mersin. This project is an important step towards increasing renewable energy resources.

Vakıfbank (VAKBN)

Vakıfbank has signed a new loan agreement worth a total of $300 million with the Asian Infrastructure Investment Bank. This 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% indirectly owned subsidiary Gülermak Renewables Deutschland Holding. The total sale price has been determined as 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 optimistic outlook for technology companies continues to grow. Risk appetite remains high in stock markets, driven by expectations for a year-end rally. Focus is on the growth data to be announced in the US.

Gold and Silver

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

Recent Developments in the Turkish Economy

In Borsa Istanbul, the BIST 100 index 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 (CBRT), it has been observed that the reductions in the policy rate have reflected on the pricing of credits and deposits in the banking sector.

In the free market, the dollar is trading at 42.82 lira, while the euro is at 50.58 lira. The gram gold is also continuing 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.