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- 2025
- Working Paper
Heterogeneous Beliefs and Stock Market Fluctuations
By: Odhrain McCarthy and Sebastian Hillenbrand
This paper examines the role of heterogeneous investor beliefs in explaining stock market puzzles. Using survey data, we show that individual investors and investment professionals, such as equity analysts and strategists, form distinct beliefs. These groups rely on... View Details
- June 2025
- Case
TfL Pension Fund and the 2022 Gilt Market Crisis
By: Emil N. Siriwardane, Vincent Dessain, Emer Moloney and Carlota Moniz
On September 27, 2022, Padmesh Shukla, CIO of the Transport for London (TfL) Pension Fund, was keeping a careful eye on the turmoil in the U.K. sovereign bond (or gilt) market. When the new government announced the largest tax cuts the U.K. had seen in half a century,... View Details
Keywords: Financial Crisis; Macroeconomics; Assets; Asset Management; Borrowing and Debt; Corporate Finance; Capital Markets; Equity; Public Equity; Private Equity; Financial Liquidity; Financial Instruments; Debt Securities; Credit Derivatives and Swaps; Bonds; Stocks; Financial Strategy; Interest Rates; Governance; Governing and Advisory Boards; Crisis Management; Resource Allocation; Investment; Financial Services Industry; United Kingdom; England; London; Europe
- June 2025
- Article
Passive Ownership and Price Informativeness
By: Marco Sammon
I show that passive ownership negatively affects the degree to which stock prices anticipate earnings announcements. Estimates across several research designs imply that the rise in passive ownership over the last 30 years has caused the amount of information... View Details
Keywords: Passive Ownership; ETFs; Market Efficiency; Price; Investment Funds; Stocks; Communication
- June 2025
- Case
Vail Resorts: Responding to Activist Pressure (A)
By: Benjamin C. Esty and Edward A. Meyer
On January 27, 2025, the head of a relatively small hedge fund named Late Apex Partners sent a highly critical letter to the board of directors of Vail Resorts, the world’s largest ski resort operator. In his letter, and the 88-slide presentation that accompanied his... View Details
Keywords: Corporate Finance; Capital Budgeting; Corporate Governance; Competitive Advantage; Competitive Strategy; Leading Change; Valuation; Investment Activism; Climate Change; Management Succession; Financial Management; Risk Management; Business and Shareholder Relations; Sports Industry; Entertainment and Recreation Industry; Travel Industry; United States; Australia; Canada
- Working Paper
Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?
By: Marco Sammon and John J. Shim
Value-weighted indexes must rebalance in response to stock market composition changes, e.g., issuance, buybacks, and IPOs. In doing so, existing index funds implicitly engage in market timing. Index funds’ long-short rebalancing portfolios have a -3.5% annual return... View Details
- 2025
- Working Paper
Corporate Actions as Moral Issues
By: Zwetelina Iliewa, Elisabeth Kempf and Oliver Spalt
We examine nonpecuniary preferences across a broad set of corporate actions using a representative sample of the U.S. population. Our core findings, based on large-scale online surveys, are that (i) self-reported nonpecuniary concerns are large both for stock market... View Details
- April 2025
- Article
The Disappearing Index Effect
By: Robin Greenwood and Marco Sammon
The abnormal return associated with a stock being added to the S&P 500 has fallen from an average
of 7.4% in the 1990s to 0.3% over the past decade. This has occurred despite a significant increase in the
share of stock market assets linked to the index. A similar... View Details
- April 2025
- Article
The Fed and the Secular Decline in Interest Rates
In this paper I document a striking fact: a narrow window around Fed meetings fully captures the secular decline in U.S. Treasury yields since 1980. By contrast, yield movements outside this window are transitory and wash out over time. This is surprising because the... View Details
- March 2025 (Revised April 2025)
- Case
WallStreetBets: Democratizing Retail Investing
By: Joseph Pacelli and Alexis Lefort
In summer 2024, Jaime Rogozinski anticipated the launch of a day-trading eSports event, a vision he had nurtured for years. Rogozinski, the founder of the influential subreddit WallStreetBets (WSB), created the forum in 2012 as a space for retail traders to explore... View Details
- February 2025 (Revised March 2025)
- Case
Accounting for Bitcoin at Block
By: Charles C.Y. Wang, Seil Kim and Sa-Pyung Sean Shin
Abstract: This case explores Block Inc.'s accounting practices for Bitcoin transactions and their impact on financial reporting. Following a 10% stock price drop after missing revenue estimates in Q3 2024, Block faced scrutiny over its Bitcoin-driven revenue model.... View Details
- February 2025 (Revised May 2025)
- Case
Align Partners and SM Entertainment: Korean Shareholder Activism Meets K-Pop (A)
By: Charles C.Y. Wang and Billy Chan
For years, institutional investors had experienced very limited success in influencing the management of listed companies through shareholder activist campaigns in Korea. The common practice of circular ownership and public resentment toward foreign shareholder... View Details
- February 2025
- Supplement
Align Partners and SM Entertainment: Korean Shareholder Activism Meets K-Pop (B)
By: Charles CY Wang and Billy Chan
For years, institutional investors had experienced very limited success in influencing the management of listed companies through shareholder activist campaigns in Korea. The common practice of circular ownership and public resentment toward foreign shareholder... View Details
- January 2025 (Revised March 2025)
- Case
Creating Value by Splitting Aster: Can One Minus One Equal Two?
By: V.G. Narayanan and Kairavi Dey
Aster DM Healthcare (Aster), founded by Dr. Azad Moopen in 1987, is a prominent healthcare conglomerate with operations spanning hospitals, clinics, retail pharmacies, and diagnostic centers across India and the GCC. After its 2018 listing on India’s National Stock... View Details
- 2024
- Working Paper
Climate Solutions, Transition Risk, and Stock Returns
By: Shirley Lu, Edward J. Riedl, Simon Xu and George Serafeim
Using large language models to measure firms' climate solution products and services, we find that high-climate solution firms exhibit lower stock returns and higher market valuation multiples. Their stock prices respond positively to events signaling increased demand... View Details
- 2024
- Working Paper
Catalysts for Climate Solutions: Corporate Responses to Venture Capital Financing of Climate-tech Startups
By: Shirley Lu, George Serafeim and Simon Xu
We study whether incumbent firms increase their product focus on climate solutions in response to venture capital (VC) financing of climate-tech startups. Using large language models to measure a firm's focus on climate solutions, we find that incumbents in similar... View Details
- 2024
- Working Paper
Categorical Processing in a Complex World
By: Marco Sammon, Thomas Graeber and Christopher Roth
In real-world news environments, quantitative information is rarely presented in isolation; it is characterized through qualitative comparisons with various reference levels. Company earnings, for example, are commonly compared to analyst forecasts, previous earnings,... View Details
- November 2024
- Article
Perceptions About Monetary Policy
By: Michael D. Bauer, Carolin Pflueger and Adi Sunderam
We estimate perceptions about the Federal Reserve’s monetary policy rule from panel data on professional forecasts of interest rates and macroeconomic conditions. The perceived dependence of the federal funds rate on economic conditions varies substantially over time,... View Details
- September 2024
- Supplement
Allbirds: Decarbonizing Fashion (B)
By: Michael W. Toffel, Kenneth P. Pucker and Stacy Straaberg
The Allbirds: Decarbonizing Fashion (B) case encourages students to assess Allbirds’ product development and go-to-market strategies now that Allbirds is a publicly listed company. The (B) case provides a 2024 update on Allbirds including its initial public offering,... View Details
Keywords: Financial Markets; Initial Public Offering; Global Strategy; Collaborative Innovation and Invention; Innovation Strategy; Knowledge Sharing; Distribution; Corporate Social Responsibility and Impact; Mission and Purpose; Going Public; Performance; Diversification; Stocks; Transformation; Fashion Industry; United States; San Francisco; California; Europe; Asia; New Zealand
- August 2024 (Revised October 2024)
- Case
Discerene Group: Long-Term Public-Markets Investing
By: Luis M. Viceira and Brent Schwarz
This case discusses active investing based on fundamental valuations and price distortions created by market events, and whether contractual terms between investment managers and their investors can help align incentives between long-term investors and active managers.... View Details
- 2024
- Working Paper
Who Clears the Market When Passive Investors Trade?
By: Marco Sammon and John J. Shim
We find that firms are the primary sellers of shares when index funds are net buyers, providing shares at a nearly one-for-one rate. Rather than provide liquidity, most demand-side institutions trade in the same direction as index funds, especially over long horizons.... View Details