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    • All HBS Web  (1,626)
      • Faculty Publications  (391)

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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
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      McCarthy, Odhrain, and Sebastian Hillenbrand. "Heterogeneous Beliefs and Stock Market Fluctuations." Working Paper, June 2025. (WFA Brattle Group Ph.D. Award for Outstanding Research.)
      • 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
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      Siriwardane, Emil N., Vincent Dessain, Emer Moloney, and Carlota Moniz. "TfL Pension Fund and the 2022 Gilt Market Crisis." Harvard Business School Case 225-098, June 2025.
      • 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
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      Sammon, Marco. "Passive Ownership and Price Informativeness." Management Science 71, no. 6 (June 2025): 4582–4598.
      • 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
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      Esty, Benjamin C., and Edward A. Meyer. "Vail Resorts: Responding to Activist Pressure (A)." Harvard Business School Case 225-082, June 2025.
      • 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
      Keywords: Investment Funds; Financial Markets; Market Timing; Investment Return
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      Sammon, Marco, and John J. Shim. "Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?" SSRN Working Paper Series, No. 5080459, May 2025.
      • 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
      Keywords: Public Opinion; Corporate Social Responsibility and Impact; Moral Sensibility
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      Iliewa, Zwetelina, Elisabeth Kempf, and Oliver Spalt. "Corporate Actions as Moral Issues." NBER Working Paper Series, No. 33749, May 2025.
      • 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
      Keywords: Stocks; Investment Return; Value
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      Greenwood, Robin, and Marco Sammon. "The Disappearing Index Effect." Journal of Finance 80, no. 2 (April 2025): 657–698.
      • April 2025
      • Article

      The Fed and the Secular Decline in Interest Rates

      By: Sebastian Hillenbrand
      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
      Keywords: United States Treasury; Monetary Policy; Yield Curve
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      Hillenbrand, Sebastian. "The Fed and the Secular Decline in Interest Rates." Review of Financial Studies 38, no. 4 (April 2025). (Editor's Choice.)
      • 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
      Keywords: Investment; Emerging Markets; Market Participation; Financial Strategy; Lawsuits and Litigation; Social and Collaborative Networks; Financial Markets; Financial Services Industry; United States
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      Pacelli, Joseph, and Alexis Lefort. "WallStreetBets: Democratizing Retail Investing." Harvard Business School Case 125-002, March 2025. (Revised April 2025.)
      • 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
      Keywords: Cryptocurrency; Bitcoin; Fair Value Accounting; Revenue Recognition; Business Model; Fluctuation; Volatility; Revenue; Standards; Valuation
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      Wang, Charles C.Y., Seil Kim, and Sa-Pyung Sean Shin. "Accounting for Bitcoin at Block." Harvard Business School Case 125-072, February 2025. (Revised March 2025.)
      • 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
      Keywords: Financial Reporting; Public Equity; Stocks; Investment Activism; Music Entertainment; Corporate Governance; Success; Business and Shareholder Relations; Entertainment and Recreation Industry; South Korea
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      Wang, Charles C.Y., and Billy Chan. "Align Partners and SM Entertainment: Korean Shareholder Activism Meets K-Pop (A)." Harvard Business School Case 125-065, February 2025. (Revised May 2025.)
      • 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
      Keywords: Financial Reporting; Public Equity; Stocks; Investment Activism; Music Entertainment; Corporate Governance; Success; Business and Shareholder Relations; Entertainment and Recreation Industry; South Korea
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      Wang, Charles CY, and Billy Chan. "Align Partners and SM Entertainment: Korean Shareholder Activism Meets K-Pop (B)." Harvard Business School Supplement 125-066, February 2025.
      • 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
      Keywords: Corporate Governance; Corporate Accountability; Leadership; Change Management; Mergers and Acquisitions; Restructuring; Negotiation; Valuation; Health Industry; Asia; India; Middle East; United Arab Emirates
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      Narayanan, V.G., and Kairavi Dey. "Creating Value by Splitting Aster: Can One Minus One Equal Two?" Harvard Business School Case 125-069, January 2025. (Revised March 2025.)
      • 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
      Keywords: Technology; Generative Ai; Large Language Models; Climate Finance; Climate Change; Innovation and Invention; Environmental Sustainability; AI and Machine Learning; Investment; Financial Markets
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      Lu, Shirley, Edward J. Riedl, Simon Xu, and George Serafeim. "Climate Solutions, Transition Risk, and Stock Returns." Harvard Business School Working Paper, No. 25-024, November 2024.
      • 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
      Keywords: Climate Finance; Climate Change; Technological Innovation; Entrepreneurship; Venture Capital; Private Equity; Environmental Sustainability; Business Startups
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      Lu, Shirley, George Serafeim, and Simon Xu. "Catalysts for Climate Solutions: Corporate Responses to Venture Capital Financing of Climate-tech Startups." Harvard Business School Working Paper, No. 25-025, November 2024.
      • 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
      Keywords: Announcements; Cognition and Thinking; Communication Strategy
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      Sammon, Marco, Thomas Graeber, and Christopher Roth. "Categorical Processing in a Complex World." Working Paper, November 2024.
      • 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
      Keywords: Monetary Policy; Policy; Interest Rates; Perception; Economy; Forecasting and Prediction
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      Bauer, Michael D., Carolin Pflueger, and Adi Sunderam. "Perceptions About Monetary Policy." Quarterly Journal of Economics 139, no. 4 (November 2024): 2227–2278.
      • 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
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      Toffel, Michael W., Kenneth P. Pucker, and Stacy Straaberg. "Allbirds: Decarbonizing Fashion (B)." Harvard Business School Supplement 625-004, September 2024.
      • 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
      Keywords: Financial Strategy; Investment Funds; Valuation; Financial Markets; Financial Services Industry; Connecticut
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      Viceira, Luis M., and Brent Schwarz. "Discerene Group: Long-Term Public-Markets Investing." Harvard Business School Case 225-023, August 2024. (Revised October 2024.)
      • 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
      Keywords: Investment Funds; Institutional Investing; Price; Investment Portfolio; Financial Institutions; Financial Instruments
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      Sammon, Marco, and John J. Shim. "Who Clears the Market When Passive Investors Trade?" Working Paper, August 2024.
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