Centrus Energy Corp. (LEU) will join the S&P SmallCap 600 index before the market opens on July 14, 2026. The nuclear fuel and services company replaces Whitestone REIT in the benchmark. Ares Management Corp., an S&P 500 member, is currently acquiring Whitestone REIT.
Centrus Energy shares rose in after-hours trading following the announcement. Passive index funds and exchange-traded funds (ETFs) tracking the index must purchase the stock to align their portfolios. This rebalancing typically drives increased demand for the newly added shares.