Is There an S&P 500 Index Effect? - Federal Reserve Bank of New York

Museum & Visits Regional Economy Data & Statistics Careers Blog Press Center

About the New York Fed
- About the New York Fed
- What We Do
- Who We Are
  - Bank Leadership
  - Diversity and Inclusion
- Communities We Serve
- Governance
- More About Us
- At the New York Fed, our mission is to make the U.S. economy stronger and the financial system more stable for all segments of society. We do this by executing monetary policy, providing financial services, supervising banks and conducting research and providing expertise on issues that impact the nation and communities we serve.
  
  Introducing the New York Innovation Center: Delivering a central bank innovation execution
  
  Do you have a request for information and records? Learn how to submit it.
  
  Learn about the history of the New York Fed and central banking in the United States through articles, speeches, photos and video.
Markets & Policy Implementation

Economic Research
- Economic Research
- U.S. Economy
  - Consumer Expectations & Behavior
  - Growth & Inflation
  - Labor Market
  - Financial Stability
  - Banking
- REGIONAL ECONOMY
- RESEARCHERS
  - PUBLICATIONS
  - RESEARCH CENTERS
  - CALENDAR

Financial Institution Supervision
- Financial Institution Supervision
- Supervision & Regulation
  - Circulars
  - Regulations
- Reporting Forms & Instructions
  - Reporting Forms
  - Correspondence
- Bank Applications
- Consumer Protection
  - Community Reinvestment Act Exams
  - Frauds and Scams
- As part of our core mission, we supervise and regulate financial institutions in the Second District. Our primary objective is to maintain a safe and competitive U.S. and global banking system.
  
  The Governance & Culture Reform hub is designed to foster discussion about corporate governance and the reform of culture and behavior in the financial services industry.
  
  Need to file a report with the New York Fed? Here are all of the forms, instructions and other information related to regulatory and statistical reporting in one spot.
  
  The New York Fed works to protect consumers as well as provides information and resources on how to avoid and report specific scams.
Financial Services & Infrastructure
- Financial Services & Infrastructure
- Financial Services & Operations
- Financial Market Infrastructure & Reform
- The Federal Reserve Bank of New York works to promote sound and well-functioning financial systems and markets through its provision of industry and payment services, advancement of infrastructure reform in key markets and training and educational support to international institutions.
  
  The New York Fed provides a wide range of payment services for financial institutions and the U.S. government.
  
  The New York Fed offers the Central Banking Seminar and several specialized courses for central bankers and financial supervisors.
  
  The New York Fed has been working with tri-party repo market participants to make changes to improve the resiliency of the market to financial stress.
Community Development
& Education

Staff Reports

Is There an S&P 500 Index Effect?

Previous title: “Comovement Revisited”

2014 February 2011 Number 484
Revised November 2012

JEL classification: G10, G12, G14

Authors: Maria Kasch and Asani Sarkar

We find that the firms included in the S&P 500 index are characterized by large increases in earnings, appreciation in market value, and positive price momentum in the period preceding their index inclusion. This strong preinclusion performance predicts 1) the permanent increase of market value and 2) the change in return comovement, reflected in declines of size, value, and momentum betas, following index inclusion. Nonevent firms with similar performance experience similar appreciation in value and changes in comovement coincident with the event firms. Contrary to the consensus in the literature, our results indicate that—after accounting for the firms’ extraordinary preinclusion performance—index inclusion has no permanent effect on value and comovement.

Available only in PDF pdf

55 pages / 755 kb

Tools

E-mail Alerts

By continuing to use our site, you agree to our Terms of Use and Privacy Statement. You can learn more about how we use cookies by reviewing our Privacy Statement.