Istanbul Stock Exchange Developments: YEOTK, DOFRB and More

Highlights of the Day at Borsa Istanbul

As of December 23, 2025, we have compiled noteworthy developments at Borsa Istanbul. Here are the company news items that closely relate to 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 dollars + VAT to 73.84 million dollars + VAT, raising it by 7.84 million dollars. This move supports the company's growth targets 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 capacity energy storage wind power plant project in Mersin. This project represents 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. This agreement stands out as part of the firm'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 set at 11.23 million euros.

Koton (KOTON)

Koton continues to increase its store count in the Gulf Region by opening its second corporate store in Qatar at the City Center Shopping Mall located 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 towards technology companies continues to grow. With expectations for a year-end rally, risk appetite remains high in the stock markets. Attention is focused on the growth data to be released in the U.S.

Gold and Silver

As of Tuesday, gold has reached record levels, approaching the threshold of 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 latest analysis from the Central Bank of the Republic of Turkey (TCMB), it has been observed that the reductions in the policy interest rates have been 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 at 50.58 lira. The gram gold is also continuing to trade at around 6,162 TL.

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