Benzinga·2025-12-15 11:01Core Viewpoint - The Nasdaq-100 Index is undergoing its annual reconstitution, adding six new companies and removing six others, effective December 22 [1]. Group 1: Companies Added to the Index - The six companies being added to the Nasdaq-100 Index are Alnylam Pharmaceuticals, Ferrovial SE, Insmed Inc., Monolithic Power Systems, Seagate Technology Holdings, and Western Digital Corp [2]. Group 2: Companies Removed from the Index - The six companies being removed from the index include Biogen Inc., CDW Corporation, GlobalFoundries Inc., Lululemon Athletica Inc., ON Semiconductor Corporation, and The Trade Desk, Inc [3]. Group 3: Performance of Newly Added Companies - Seagate Technology Holdings and Western Digital Corp. have seen significant stock price increases due to rising demand for storage products driven by the AI boom, with Seagate's stock up 232.96% and Western Digital's up 277.04% year-to-date [3]. - Alnylam Pharmaceuticals reported an adjusted earnings of $2.90 per share in Q3, a turnaround from a loss of $0.50 a year ago, with quarterly sales increasing by 149% year-over-year to $1.25 billion, surpassing the consensus estimate of $977.79 million; the stock has surged 70.17% year-to-date [4]. Group 4: Performance of Removed Companies - Lululemon Athletica Inc. has experienced a stock decline of 44.95% year-to-date, despite reporting a solid Q3 earnings beat and raising its full-year forecast; the company saw a 2% dip in North American revenue but strong international growth with a 33% increase in revenue and 18% rise in comparable sales [6]. Group 5: Related Market Movements - Walmart missed inclusion in the Nasdaq-100 due to a late switch to Nasdaq, moving from the New York Stock Exchange after the qualification deadline [5]. - The Nasdaq reconstitution follows the S&P 500's quarterly rebalance, with Carvana, CRH Plc, and Comfort Systems USA set to join the S&P 500, while LKQ Corp, Solstice Advanced Materials, and Mohawk Industries are being removed [7].