On October 18, 2025, Sprott Asset Management USA, Inc., a wholly‑owned subsidiary of Sprott Inc. (SII), announced that it would modify the North Shore Global Uranium Mining Index (URNMX), the benchmark that the Sprott Uranium Miners ETF (NYSE Arca: URNM) tracks.
The changes include new rules for security eligibility and weighting, a shift of the index’s reconstitution dates from March and September to June and December, and the addition of quarterly rebalances on the third Fridays of March and September. The index was recently acquired by VettaFi, a subsidiary of TMX Group, and the modifications are set to take effect at the next scheduled rebalance after the close of trading on December 19, 2025.
These adjustments alter the composition and timing of the ETF’s underlying index, thereby affecting the fund’s exposure to uranium‑mining companies and potentially influencing its performance and investor returns. The announcement represents a material change to the ETF’s structure and is the first public disclosure of this index modification in the existing Sprott Inc. news archive.
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