Data on Bitcoin mining pool distribution indicates that the four largest Bitcoin mining pools now control more than 70% of the network’s total hash rate, renewing long-running questions about how concentrated Bitcoin’s block production has become. The concentration figure describes the combined share of aggregate network hash rate attributed to the top four pools, not the market position of four individual mining companies. Public pool-distribution dashboards such as mempool.space’s mining pools chart track this by grouping the blocks each pool has produced over a recent window and expressing that as a percentage of all blocks mined. For related coverage, see Top Bitcoin ETFs by AUM in 2026: Latest U.S. Ranking.