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Ciena Set to Join S&P 500; Arrowhead Pharmaceuticals to Join S&P MidCap 400; ADT and OneSpaWorld Holdings to Join S&P SmallCap 600

prnewswire.com
DAY Dayforce is being removed from the S&P 500 index. This change suggests a reclassification of the company's market capitalization, not necessarily a negative performance indicator. ADT ADT is being added to the S&P SmallCap 600 index. This inclusion suggests positive recognition of the company's market size and performance within its category. OSW OneSpaWorld Holdings is being added to the S&P SmallCap 600 index. This inclusion indicates a positive development in the company's market standing and size. DVAX Dynavax Technologies is being removed from the S&P SmallCap 600 index. This change indicates a reclassification of the company's market capitalization, not necessarily a negative performance indicator. ARWR Arrowhead Pharmaceuticals is being added to the S&P MidCap 400 index, indicating a positive step in its market capitalization growth. However, it is also being removed from the S&P SmallCap 600, suggesting a reclassification. CIEN Ciena is being added to the S&P 500 index, which is generally a positive indicator of its market standing and growth. However, it is also being removed from the S&P MidCap 400, suggesting a reclassification rather than a purely positive or negative development. SPGI S&P Global is mentioned as the parent company of S&P Dow Jones Indices. The article focuses on index changes and does not provide specific sentiment towards S&P Global itself.

NEW YORK, Feb. 4, 2026 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400, S&P SmallCap 600:

Following is a summary of the changes that will take place prior to the open of trading on the effective date:

Effective Date

Index Name

Action

Company Name

Ticker

GICS Sector

Feb 9, 2026

S&P 500

Addition

Ciena

CIEN

Information Technology

Feb 9, 2026

S&P 500

Deletion

Dayforce

DAY

Industrials

Feb 9, 2026

S&P MidCap 400

Addition

Arrowhead Pharmaceuticals

ARWR

Health Care

Feb 9, 2026

S&P MidCap 400

Deletion

Ciena

CIEN

Information Technology

Feb 9, 2026

S&P SmallCap 600

Addition

ADT

ADT

Consumer Discretionary

Feb 9, 2026

S&P SmallCap 600

Deletion

Arrowhead Pharmaceuticals

ARWR

Health Care

Feb 10, 2026

S&P SmallCap 600

Addition

OneSpaWorld Holdings

OSW

Consumer Discretionary

Feb 10, 2026

S&P SmallCap 600

Deletion

Dynavax Technologies

DVAX

Health Care

ABOUT S&P DOW JONES INDICES

S&P Dow Jones Indices is the largest global resource for essential index-based concepts, data and research, and home to iconic financial market indicators, such as the S&P 500® and the Dow Jones Industrial Average®. More assets are invested in products based on our indices than products based on indices from any other provider in the world. Since Charles Dow invented the first index in 1884, S&P DJI has been innovating and developing indices across the spectrum of asset classes helping to define the way investors measure and trade the markets.

S&P Dow Jones Indices is a division of S&P Global (NYSE: SPGI), which provides essential intelligence for individuals, companies, and governments to make decisions with confidence. For more information, visit www.spglobal.com/spdji/en/.

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SOURCE S&P Dow Jones Indices