Core Insights - The North Shore Global Uranium Mining Index (URNMX) is undergoing modifications to enhance liquidity and improve ETF tracking, following its acquisition by VettaFi [1][2] Index Methodology Changes - The index targets companies that allocate at least 50% of their assets to uranium mining activities, including mining, exploration, and production [2] - Changes include adjustments to security eligibility, weighting, and the timing of index reconstitution and rebalances, effective after the close of trading on December 19, 2025 [2][3] Security Eligibility and Weighting - New securities must have a minimum free-float market capitalization of USD $125 million, up from USD $40 million, while existing holdings require a minimum of USD $100 million [5] - A minimum average daily value traded (ADVT) of USD $100,000 is required for new securities, with a buffer of USD $75,000 for existing holdings [5] - The index will now use free-float weighting for market capitalization eligibility and has increased the maximum weight cap for a single security from 15% to 20% [5]