Alger Russell Innovation Index Announces Q3 2026 Rebalancing

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Fred Alger Management, LLC, a privately held growth equity investment manager, announced the quarterly rebalancing details for the Alger Russell Innovation Index on September 14, 2026. The adjustments are scheduled to take effect following the market close on Friday, September 18, 2026. Additional details regarding the index can be accessed via the London Stock Exchange Group website. Established in 1964 and headquartered in New York City, Alger is recognized as a pioneer in growth-style investment management, applying its philosophy of identifying companies undergoing positive dynamic change for over 60 years. The firm offers a wide range of growth equity separate accounts, mutual funds, ETFs, and private investment vehicles. Investors are reminded that stock market investments involve risks, including potential principal loss, and that growth stocks often exhibit higher volatility due to their valuations relative to earnings and sensitivity to external market shifts.

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Fred Alger Management announced that the Q3 regular rebalancing of the Alger Russell Innovation Index will take place after the market close on September 18, 2026. This index restructuring directly affects the inclusion and exclusion of major innovative growth companies such as DT, SWKS, ZBRA, ZS, and ALNY. Investors should pay attention to short-term supply and demand shifts and increased volatility driven by index-tracking fund flows.

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This Alger Russell Innovation Index rebalancing takes effect immediately after the close on September 18, 2026, triggering large-scale capital movements of passive funds tracking the added and removed stocks (DT, SWKS, ZBRA, etc.). This acts as a causal factor maximizing short-term volume surges and price volatility for individual stocks.

In a bullish scenario, newly included companies gain upward stock price momentum from institutional supply and demand inflows, while in a bearish scenario, excluded stocks face downward pressure due to passive selling volume. Therefore, investors must monitor volume changes and index-tracking fund flows before and after the rebalancing as core indicators.

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