Bitcoin dominance in the cryptocurrency market reached its highest levels since 2021 during the first half of 2025, peaking around 65.65% to 66%. This surge reflects strong investor preference for Bitcoin amid macroeconomic uncertainty and increased demand driven by exchange-traded funds (ETFs). Despite this dominance, altcoins have struggled to gain traction, with Bitcoin dominance fluctuating slightly but remaining above 60% through the end of June. Market observers speculate on the potential for an altcoin season in July. The first half of 2025 also saw several positive developments including the establishment of a U.S. Bitcoin strategic reserve, the passage of stablecoin legislation, regulatory easing by the SEC under the FIT21 Act, the listing of crypto companies, trends toward blockchain integration in U.S. equities and real-world assets (RWA), and a wave of publicly listed companies issuing bonds to buy Bitcoin. These factors contributed to a market environment where Bitcoin maintained its leading position despite ongoing challenges for altcoins.