Invesco Solar ETF (TAN) is an exchange-traded fund that seeks to track the performance, before fees and expenses, of the MAC Global Solar Energy Index, which comprises global companies involved in solar energy technologies across the entire value chain including raw materials, manufacturing, installers, solar plant operations, financing, and related equipment such as power inverters and encapsulants. The fund invests at least 90% of its total assets in securities comprising the underlying index or depositary receipts representing such securities; top holdings as of late 2025 include Nextracker Inc. (12.06%), First Solar Inc. (10.10%), Sunrun Inc. (6.94%), Enphase Energy Inc. (6.42%), and GCL Technology Holdings Ltd. (5.70%), with approximately 39 holdings concentrated in pure-play solar firms (generating over two-thirds of revenue from solar) and medium-play firms (over one-third); the portfolio features significant geographic exposure to the United States (around 46%), China (24%), and other developed and emerging markets. Launched on April 15, 2008 by Invesco Ltd., with the fund domiciled in the United States and administered from Invesco's principal headquarters at 1331 Spring Street NW, Atlanta, Georgia, TAN operates passively with quarterly rebalancing and serves investors targeting the solar energy segment of the renewable power industry. Recent developments include a robust 36% rally in 2025 driven by stable interest rates, corporate power purchase agreements, and lingering Inflation Reduction Act incentives, though tempered by volatility from U.S. Senate proposals in mid-2025 to phase out renewable tax credits by 2028 and tighter Trump administration restrictions on solar projects; no major acquisitions, partnerships, funding rounds, or structural changes for the ETF itself were reported in 2024-2025, with performance reflecting broader sector dynamics including underperformance earlier in the year amid policy uncertainties.