Imitating Warren Buffett’s Stock Picks

There are several anomalies in the stock market and they persist over time. Imitating Warren Buffett‘s stock picks is one of them. An academic study calculated that an ordinary investor could have outperformed the S&P 500 index by 10.75 percentage points EVERY YEAR between 1976 and 2006 simply by imitating Warren Buffett’s moves AFTER they are publicly disclosed. Isn’t this interesting? Here is the abstract of the study:

Warren Buffett

We analyze Berkshire Hathaway’s equity portfolio over the 1976 to 2006 period and explore potential explanations for its superior performance. Contrary to popular belief, we find Berkshire Hathaway invests primarily in large-cap growth rather than “value” stocks. Over the period the portfolio beat the benchmarks in 27 out of 31 years, on average exceeding the S&P 500 Index by 11.14%, the value-weighted index of all stocks by 10.92%, and a Fama and French characteristic-based portfolio by 8.56% per year. Although beating the market in all but four years can statistically happen due to chance, incorporating the magnitude by which the portfolio beats the market makes a luck explanation extremely unlikely even after taking into account ex-post selection bias. We find that Berkshire Hathaway’s portfolio is concentrated in relatively few stocks with the top five holdings averaging 73% of the portfolio value. While increased volatility is normally associated with higher concentration we show the volatility of the portfolio is driven by large positive returns and not downside risk. The market appears to under-react to the news of a Berkshire Hathaway stock investment since a hypothetical portfolio that mimics the investments at the beginning of the following month after they are publicly disclosed also earns significantly positive abnormal returns of 10.75% over the S&P 500 Index. Our evidence suggests the Berkshire Hathaway triumvirates of Warren Buffett, Charles Munger, and Lou Simpson posses’ investment skill unlikely to be explained by Efficient Market Theory.

However, we should note that Warren Buffett’s alpha disappeared over the last decade as Buffett shifted his focus to protecting his wealth instead of risking it.

blog comments powered by Disqus
Insider Monkey Headlines
Insider Monkey Small Cap Strategy
Insider Monkey Small Cap Strategy

Insider Monkey beat the market by 52 percentage points in 24 months. Our beta is only 1.2 (don't click this link if beating the market isn't important to you).

Lists

All In: The 7 Richest Poker Players in the World

Abracadabra: The 10 Best Magicians in the World

The 10 Richest Asian Countries in the World in 2014

Eyes in the Sky: 10 Things You Need to Know About Drones

Rising Stars: The 6 Best Silicon Valley Startups

Military Muscle: The 5 Most Advanced Armies in South America

All that Glitters: The 7 Most Luxurious Jewelry Brands in the World

5 Things You Didn’t Know About ISIS but Should

Empowering Your Money: The 5 Best Energy Stocks to Invest In

The 11 Best Android Apps You Can’t Get on iOS

The 10 Most Important International Conflicts in 2014

Mood Enhancers: The 20 Most Uplifting Songs of all Time

Lover Beware: The 8 Countries that Cheat the Most

Breath of Fresh Air: The 25 Countries with the Best Air Quality on the Planet

Singles Beware: The 8 Worst Mistakes Made on First Dates

Healthy and Happy: The 10 Countries with Lowest Healthcare Costs

The 6 Best Company Team Building Activities to Build Workplace Camaraderie

Ships Ahoy: The 10 Busiest Shipping Ports in the World

10 Productivity Tips to Save You Time and Help You Do More With Less

Grab a Bite: The Most Popular Fast Food Restaurants in America

Friday Night Thirst: The 10 Most Popular Cocktails in the World

The 6 Greatest Unsolved Mysteries We May Never Figure Out

7 Useless Products You Never Should’ve Bought

The 5 Reasons Why You’re Single and Miserable

The 7 Most Addictive Foods in the World We Can’t Stop Eating (Even Though We Should)

5 Amazing Places You Can Swim with Dolphins

The Top 7 Most Livable Countries In The World

The 10 Most Expensive Baseball Cards Ever Pulled From A Pack

The 5 Easiest Second Languages to Learn for English Speakers

Silver Spoon: The 6 Richest Families in the World

The 20 Countries with the Largest Prison Populations in the World

The Top 10 Richest Actors in the World

The 10 Best Airline Stocks to Invest In Before They Fly Too High

Burger Kings: The 10 Most Expensive Burgers in the World

The 10 Most Ethnically Diverse Countries in the World

The 10 Most Exclusive Credit Cards in the World

The 10 Most Expensive Cruise Ships in the World

The 10 Fastest Supercomputers in the World

The 10 Best Countries for Doing Business 2015

6 Most Expensive Fruits In The World

10 Worst Airlines in the World

The 10 Biggest Tax Havens in the World to Stash Your Money

The 15 Most Murderous Countries in the World

10 Largest Colleges in the World: Bigger Isn’t Always Better

Comedians in Cars Getting Coffee: The 6 Comedians Seinfeld Needs to Interview

Easy Money: The 10 Most Successful Investors in the World Today

The 10 Most Deadly Diseases in the World Today

The 5 Most Expensive Luxury Motorhomes in the World

20 Largest Stock Exchanges in the World

6 Richest Painters In The World 2014

Subscribe

Enter your email:

Delivered by FeedBurner

X

Thanks! An email with instructions is sent to !

Your email already exists in our database. Click here to go to your subscriptions

Insider Monkey returned 47.6% in its first year! Wondering How?

Download a complete edition of our newsletter for free!