- Momentum investing
Momentum investing, also sometimes known as "Fair Weather Investing", is a system of buying stocks or other securities that have had high returns over the past three to twelve months, and selling those that have had poor returns over the same period. It has been reported that this strategy yields average returns of 1% per month for the following 3–12 months as shown by Narasimhan Jegadeesh and Sheridan Titman.
While no consensus exists about the validity of this claim, economists have trouble reconciling this phenomenon, using the efficient-market hypothesis. Two main hypotheses have been submitted to explain the effect in terms of an efficient market. In the first, it is assumed that momentum investors bear significant risk for assuming this strategy, and, therefore, the high returns are a compensation for the risk. The second theory assumes that momentum investors are exploiting behavioral shortcomings in other investors, such as investor herding, investor over and underreaction, and confirmation bias.
Seasonal effects may help to explain some of the reason for success in the momentum investing strategy. If a stock has performed poorly for months leading up to the end of the year, investors may decide to sell their holdings for tax purposes. Increased supply of shares in the market drive its price down, causing others to sell. Once the reason for tax selling is eliminated, the stock's price tends to recover.
Some investors may react to the inefficient pricing of a stock caused by momentum investing by using the tool of arbitrage.
It is believed that George Soros used a variation of momentum investing by up bidding the price of already overvalued equities in the market for conglomerates in the 1960s and for real estate investment trusts in the 1970s. This strategy is termed positive feedback investing.
Richard Driehaus is widely considered the father of momentum investing. This Chicago money manager takes exception with the old stock market adage of buying low and selling high. According to him, "far more money is made buying high and selling at even higher prices." 
- Momentum (finance)
- Carhart four-factor model (1997) - extension of the Fama-French three-factor model, containing an additional momentum factor (MOM)
- ^ Schwager, Jack D.. The New Market Wizards: Conversations With America's Top Traders. John Wiley and Sons, 1992, (pg. 224), ISBN 0-471-13236-5
- ^ http://www.dfaus.com/library/articles/informational_efficiency_of_stock_prices/
- Jegadeesh, Narasimhan, and Titman, Sheridan, 1993, "Returns to buying winners and selling losers: Implications for stock market efficiency", Journal of Finance 48, 65-91.
- Soros, George, 1987, The Alchemy of Finance, Simon and Shuster, New York.
- Tanous, Peter J., 1997, Investment Gurus, New York Institute of Finance, NJ, ISBN 0-7352-0069-6.
Stock market Types of stocks Participants Exchanges Stock valuation Financial ratios Trading theories
and strategiesAlgorithmic trading · Buy and hold · Contrarian investing · Day trading · Efficient-market hypothesis · Fundamental analysis · Market timing · Modern portfolio theory · Momentum investing · Mosaic theory · Pairs trade · Post-modern portfolio theory · Random walk hypothesis · Style investing · Swing trading · Technical analysis · Trend following
Related termsBlock trade · Cross listing · Dark liquidity · Dividend · Dual-listed company · DuPont Model · Flight-to-quality · Haircut · IPO · Margin · Market anomaly · Market capitalization · Market depth · Market manipulation · Market trend · Mean reversion · Momentum · Open outcry · Public float · Rally · Reverse stock split · Share capital · Short selling · Slippage · Speculation · Stock dilution · Stock split · Trade · Uptick rule · Volatility · Voting interest · Stock market index
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