Blockchain intelligence platform Arkham has disclosed that Cameron and Tyler Winklevoss, founders of the Gemini exchange, currently hold approximately $1.3 billion in Bitcoin. This revelation highlights the significant cryptocurrency portfolio of the Winklevoss brothers, who initially invested $11 million in Bitcoin in 2013, acquiring about 1% of the total supply at the time. Arkham's analysis shows that the Winklevoss brothers' current holdings represent just 10% of their original Bitcoin position, suggesting strategic diversification and funding for Gemini operations. Despite the reduction, their holdings remain one of the largest documented Bitcoin portfolios, reflecting their long-term conviction in the cryptocurrency's potential. The transparency provided by Arkham's on-chain analysis underscores the growing trend of blockchain analytics in financial markets, offering insights into major holdings and enhancing market efficiency. The Winklevoss brothers' disciplined approach to portfolio management continues to serve as a benchmark for institutional engagement in the digital asset space.