On January 15, Matthias Voelkel, CEO of the Stuttgart Stock Exchange Group in Germany, said that the election of Donald Trump and his ambition to make the United States a "bitcoin country" are driving market expansion, and his group is seeking to take a larger share of the cryptocurrency sector. While Voelkel did not disclose the specific amount of cryptocurrency trading on the Stuttgart exchange, he pointed out that the amount has tripled last year, accounting for about 25% of total revenue. He added that bitcoin, the most important cryptocurrency in the world, accounted for "almost 50% of such activity". At the end of last year, the exchange revealed that its total cryptocurrency holdings for customers had reached 4.30 billion euros. The exchange also said it has managed to attract more than a million cryptocurrency trading clients, including professionals and private clients mainly from German-speaking countries. Voelkel also revealed that he has personally invested in bitcoin and said he was attracted by the tamper-proof technology behind it. He believes cryptocurrencies will only grow in popularity, noting that bitcoin "has limited supply and growing demand from investors of all ages".