Markets

Nasdaq-100 Index Reconstitution Adds Six New Companies, Removes Six Others Effective Dec. 22

December 12, 2025 — 09:42 pm EST

Written by RTTNews.com for RTTNews->

(RTTNews) - Nasdaq (NDAQ) announced the results of the annual reconstitution of the Nasdaq-100 Index (NDX). The changes will take effect prior to market open on Monday, December 22, 2025.

Six companies will be added to the Index: Alnylam Pharmaceuticals, Inc. (ALNY), Ferrovial SE (FER), Insmed Inc. (INSM), Monolithic Power Systems, Inc. (MPWR), Seagate Technology Holdings plc (STX), and Western Digital Corp. (WDC).

Following this year's reconstitution, six companies will be removed from the Index: Biogen Inc. (BIIB), CDW Corporation (CDW), GlobalFoundries Inc. (GFS), Lululemon Athletica Inc. (LULU), ON Semiconductor Corporation (ON), and The Trade Desk, Inc. (TTD).

The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.

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Founded in the late 1990s by Andrew Mariathasan in New York, with the goal of covering Wall Street for a new generation of investors, RTTNews has expanded steadily over the years to become a trusted provider of content for a wide array of subjects across several platforms. RTT's Financial Newswire is relied upon by some of the world's largest financial institutions, including banks, brokerages, trading platforms and financial exchanges.
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Stocks mentioned

ALNY
BIIB
CDW
GFS
INSM
LULU
MPWR
NDAQ
ON
STX
TTDKY
WDC

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