Bitcoin mining stocks have underperformed in recent weeks despite the rising price of the cryptocurrency. shares of Riot Platforms, Bitfarms, and Bitdeer are hovering near a 20% decline. Industry observers point to market concerns over the upcoming halving of bitcoin, which is expected to occur in late April, as the main reason. Another factor is a proposed 30 percent excise tax on miners' energy use. The Biden administration first imposed such a tax on miners last year, citing environmental concerns. This potential tax is again in the U.S. Treasury Department's 2025 revenue proposal.