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Publications

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  • All HBS Web  (107,895)
    • Faculty Publications  (10)

    Show Results For

    • All HBS Web  (107,895)
      • Faculty Publications  (10)

      Sammon, Marco Remove Sammon, Marco →

      Page 1 of 10 Results
      • 2022
      • Working Paper

      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 3.4% in the 1980s and 7.6% in the 1990s to 0.8% over the past decade. This has occurred despite a significant increase in the percentage of stock market assets linked...  View Details
      Keywords: Stocks; Investment Return
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      Greenwood, Robin, and Marco Sammon. "The Disappearing Index Effect." Harvard Business School Working Paper, No. 23-025, December 2022.
      • 2022
      • Working Paper

      The Retail Habitat

      By: Toomas Laarits and Marco Sammon
      Retail investors trade hard-to-value stocks. Controlling for size, stocks with a high share of retail-initiated trades are composed of more intangible capital, have longer duration cash-flows and a higher likelihood of being mispriced. Consistent with retail-heavy...  View Details
      Keywords: Retail; Retail Trade; Intangible Capital; Mispricing; Investment; Valuation; Business Earnings
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      Laarits, Toomas, and Marco Sammon. "The Retail Habitat." Working Paper, October 2022.
      • 2022
      • Working Paper

      Retail Investors’ Contrarian Behavior Around News, Attention, and the Momentum Effect

      By: Cheng (Patrick) Luo, Enrichetta Ravina, Marco Sammon and Luis M. Viceira
      Using a large panel of U.S. brokerage accounts trades and positions, we show that a large fraction of retail investors trade as contrarians after large earnings surprises, especially for loser stocks, and that such contrarian trading contributes to post earnings...  View Details
      Keywords: Retail Investors; Post Earnings Announcement Drift; Price Momentum; Behavioral Finance; Investment; Demographics
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      Luo, Cheng (Patrick), Enrichetta Ravina, Marco Sammon, and Luis M. Viceira. "Retail Investors’ Contrarian Behavior Around News, Attention, and the Momentum Effect." Working Paper, June 2022.
      • 2022
      • Working Paper

      Passive Ownership and Price Informativeness

      By: Marco Sammon
      I propose three new empirical measures of price informativeness motivated by a theoretical model. I find average price informativeness declined over the past 30 years and passive ownership is negatively correlated with price informativeness. To establish causality, I...  View Details
      Keywords: Passive Ownership; ETFs; Market Efficiency; Ownership; Price; Theory; Measurement and Metrics
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      Sammon, Marco. "Passive Ownership and Price Informativeness." Working Paper, September 2022.
      • 2022
      • Working Paper

      The Passive-Ownership Share Is Double What You Think It Is

      By: Alex Chinco and Marco Sammon
      We estimate that passive investors held 37.8% of the US stock market in 2020. This value comes from studying the closing volumes of index additions and deletions on reconstitution day. 37.8% is more than double the widely accepted previous estimate of 15%, which...  View Details
      Keywords: Indexing; Passive Investing; Exchange-traded Funds (ETFs); Russell Reconstitution Day; Trading Volume; Information-based Asset Pricing; Investment; Investment Funds; Asset Pricing
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      Chinco, Alex, and Marco Sammon. "The Passive-Ownership Share Is Double What You Think It Is." Working Paper, August 2022.
      • 2022
      • Working Paper

      What Triggers National Stock Market Jumps?

      By: Scott R. Baker, Nicholas Bloom, Steven J. Davis and Marco Sammon
      We examine newspapers the day after major stock-market jumps to evaluate the proximate cause, geographic source, and clarity of these events from 1900 in the US, 1930 in the UK and 1980 in 12 other countries. We find four main results. First, the United States plays an...  View Details
      Keywords: Uncertainty; Policy Uncertainty; Stock Market; Financial Markets; Volatility; Risk and Uncertainty; Policy; Newspapers
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      Baker, Scott R., Nicholas Bloom, Steven J. Davis, and Marco Sammon. "What Triggers National Stock Market Jumps?" Working Paper, February 2022.
      • December 2021
      • Article

      Trade Policy Uncertainty and Stock Returns

      By: Marcelo Bianconi, Federico Esposito and Marco Sammon
      A recent literature has documented large real effects of trade policy uncertainty (TPU) on trade, employment, and investment, but there is little evidence that investors are compensated for bearing such risk. To quantify the risk premium associated with TPU, we exploit...  View Details
      Keywords: Trade Policy; Uncertainty; Stock Returns; Risk Premium; Tariff Rates; Portfolio Analysis; Trade; Policy; Risk and Uncertainty; Stocks; Investment Return
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      Bianconi, Marcelo, Federico Esposito, and Marco Sammon. "Trade Policy Uncertainty and Stock Returns." Art. 102492. Journal of International Money and Finance 119 (December 2021).
      • 2022
      • Working Paper

      Customer Churn and Intangible Capital

      By: Scott R. Baker, Brian Baugh and Marco Sammon
      Intangible capital is a crucial and growing piece of firms’ capital structure and helps to explain long run trends in concentration and markups. We develop new firm level metrics regarding a key component of intangible capital—customer churn—using a class of household...  View Details
      Keywords: Customer Base; Transaction Data; Customer Churn; Intangible Capital; Capital; Capital Structure; Customers; Corporate Finance
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      Baker, Scott R., Brian Baugh, and Marco Sammon. "Customer Churn and Intangible Capital." Working Paper, October 2022.
      • Article

      The Unprecedented Stock Market Reaction to COVID-19

      By: Scott Baker, Nicholas Bloom, Steven J. Davis, Kyle Kost, Marco Sammon and Tasaneeya Viratyosin
      No previous infectious disease outbreak, including the Spanish Flu, has impacted the stock market as forcefully as the COVID-19 pandemic. In fact, previous pandemics left only mild traces on the U.S. stock market. We use text-based methods to develop these points with...  View Details
      Keywords: COVID-19; Stock Market; Health Pandemics; Governance; Policy; Financial Markets
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      Baker, Scott, Nicholas Bloom, Steven J. Davis, Kyle Kost, Marco Sammon, and Tasaneeya Viratyosin. "The Unprecedented Stock Market Reaction to COVID-19." Review of Asset Pricing Studies 10, no. 4 (December 2020): 742–758.
      • Article

      Environmental, Social, and Governance Criteria: Why Investors Should Care

      By: Ravi Jagannathan, Ashwin Ravikumar and Marco Sammon
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      Jagannathan, Ravi, Ashwin Ravikumar, and Marco Sammon. "Environmental, Social, and Governance Criteria: Why Investors Should Care." Journal of Investment Management 16, no. 1 (2018): 18–31.
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