News Release

Twitter useful for stock picks, could boost market efficiency, shows study

Business Announcement

University of Toronto, Rotman School of Management

Partha Mohanram, University of Toronto, Rotman School of Management

image: Partha Mohanram holds the John H. Watson Chair in Value Investing, is a professor of accounting at the Rotman School of Management and director of the India Innovation Institute. Professor Mohanram has published extensively in the top accounting and management journals, with publications in The Accounting Review, Review of Accounting Studies, Journal of Accounting Research, Journal of Accounting and Economics, Contemporary Accounting Research and Management Science. He is considered to be one of the leading experts in the area of valuation, with many papers on fundamental analysis and the measurement of implied cost of capital. His papers are highly cited by academic colleagues and are featured in the business press. He obtained his Ph.D. in Business Economics from Harvard. Prior to that, he obtained his PGDM (MBA) from IIM-Ahmedabad, and a B.Tech in Computer Science from IIT-Madras. view more 

Credit: Rotman School

Toronto - Despite concerns to the contrary, it turns out that Twitter is not uninformative when it comes to its reliability as an investor information source.

New research shows that the hive mind created by the social media platform does a good job of predicting company earnings and their subsequent impact on stock prices.

The study was motivated by exponential growth in "peer-to-peer" sharing and information tools, exemplified by social media such as Twitter, said Partha Mohanram, John H. Watson Chair in Value Investing, and professor of accounting at the University of Toronto's Rotman School of Management. He conducted the study with researchers from two other universities.

"If you want to find out if a stock or company is likely doing well or doing badly, you don't just follow what the person in The Wall Street Journal or Barron's magazine is saying," said Prof. Mohanram, who researches valuation, "you also focus on what other people who are also investing in stock markets are saying."

The study applied textual analysis techniques to 870,000 tweets about 3,600 companies between January 2009 and the end of September 2012. On the whole, tweets in the days leading up to a firm's quarterly earnings reports successfully predicted whether the firm would meet its targets or not. Twitter activity also did well in forecasting how the stock price would subsequently respond.

The effect was especially strong in situations where there was generally scant information about a company, such as a small firm with limited marketing and communications capacity, and for tweets that conveyed information specifically about a firm's fundamentals and stock activity. Cases like those underscore how social media can promote market efficiency by sharing additional valuable information.

"The tweets are from both people expressing their own original opinions about firm fundamentals and firms passing on existing information," said Prof. Mohanram. "This highlights the dual role of Twitter - as a source of new information and as a new mechanism to disseminate existing information.

The results reflect the concept of the "Wisdom of Crowds," where it's been found that a large group of people en masse can better predict a result than a single expert.

Although Twitter has been misused to communicate damaging, false reports about a firm, the researchers say their study shows why regulation to reduce such misleading information is not warranted. The diversity and independence of opinion provided through social media should trump concerns about limited cases of manipulation, they say.

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Eli Bartov of New York University and Lucile Faurel of Arizona State University co-authored the study.

For the latest thinking on business, management and economics from the Rotman School of Management, visit http://www.rotman.utoronto.ca/FacultyAndResearch/Research/NewThinking.

The Rotman School of Management is located in the heart of Canada's commercial and cultural capital and is part of the University of Toronto, one of the world's top 20 research universities. The Rotman School fosters a new way to think that enables our graduates to tackle today's global business challenges. For more information, visit http://www.rotman.utoronto.ca.

For more information:

Ken McGuffin
Manager, Media Relations
Rotman School of Management
University of Toronto
Voice 416.946.3818
E-mail mcguffin@rotman.utoronto.ca


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