Peter Lynch's 25 Golden Rules of Investing

Book: Beating the Street by Peter Lynch with John Rothchild | ISBN: 978-0-671-75915-5

At the end of Beating the Street, Lynch gives us his final list. Twenty-five rules distilled from two decades of investing. He calls it his “St. Agnes good-bye chorus.” Some of these rules echo what he’s said throughout the book. Others feel like hard-won confessions.

Here they are, with my thoughts on each.

The Rules

1. Investing is fun, exciting, and dangerous if you don’t do any work.

This is rule number one for a reason. The book is full of examples where Lynch made dozens of phone calls, read every quarterly report, and visited companies in person. Fun without homework is gambling.

2. Your investor’s edge is something you already have.

You don’t get your edge from Wall Street experts. You get it from your own job, your hobbies, your neighborhood. The mall manager who shops at the Gap every day has better intelligence on the Gap than most analysts.

3. The stock market is dominated by professional investors, and that makes it easier for amateurs.

This sounds backward, but Lynch explains why. Professional fund managers are forced to diversify into hundreds of stocks, follow rigid rules, and avoid anything that might look bad if it fails. That leaves plenty of small companies for regular people to find first.

4. Behind every stock is a company. Find out what it’s doing.

Simple but powerful. Lynch says people spend more time researching a new refrigerator than researching the stocks they buy. That’s a problem.

5. In the short term, stock price and company performance can be completely disconnected. In the long term, there is a 100 percent correlation.

This is maybe the most important rule in the entire book. Short-term prices are noise. Long-term prices follow earnings. Patience is the key.

6. You have to know what you own, and why you own it.

“This baby is a cinch to go up!” doesn’t count as a reason. You should be able to explain your investment thesis in a few sentences. If you can’t, you don’t know enough.

7. Long shots almost always miss the mark.

Lynch invested in a few speculative plays throughout the book. Some worked. Most didn’t. The base rate on long shots is terrible.

8. Owning stocks is like having children. Don’t get involved with more than you can handle.

A part-time investor can realistically follow 8-12 companies. You only need about 5 in your portfolio at any time. Quality over quantity.

9. If you can’t find any attractive companies, put your money in the bank.

No rule says you have to be fully invested at all times. Cash is a valid position. Buying bad stocks because you feel like you should own something is a guaranteed way to lose money.

10. Never invest in a company without understanding its finances.

The biggest losses come from companies with poor balance sheets. Always check if the company is solvent before risking your money. Lynch checked the balance sheet of every single company he recommended in this book.

11. Avoid hot stocks in hot industries.

Great companies in cold, boring, nongrowth industries are consistent big winners. Lynch found huge returns in S&Ls, nursery stocks, and appliance retailers. Not exactly the kind of stuff that makes headlines.

12. With small companies, wait until they turn a profit before you invest.

Hope is not a strategy. Let the company prove it can actually make money.

13. If you’re investing in a troubled industry, buy the companies with staying power.

And wait for signs of revival. Buggy whips and radio tubes were troubled industries that never came back. Not every turnaround works.

14. Your downside is limited, but your upside is unlimited.

If you invest $1,000, the most you can lose is $1,000. But you could make $10,000 or $50,000 over time. This asymmetry is the entire argument for owning stocks. You only need a few big winners in a lifetime.

15. The observant amateur can find great growth companies long before the professionals.

Every region of the country produces winners. Lynch found them at the Burlington Mall, in his neighborhood, and from his daughters’ shopping habits.

16. A stock market decline is as routine as a January blizzard in Colorado.

If you’re prepared, it can’t hurt you. Every decline is an opportunity. Lynch bought aggressively after the 1987 crash, the 1990 Saddam sell-off, and every dip in between.

17. Everyone has the brainpower to make money in stocks. Not everyone has the stomach.

If you sell everything in a panic, stay away from stocks entirely. Buy index funds or bonds. Know yourself.

18. There is always something to worry about.

Ignore weekend thinking. Ignore scary headlines. Sell a stock because the company’s fundamentals deteriorate, not because the news is depressing.

19. Nobody can predict interest rates, the economy, or the stock market.

Dismiss all forecasts. Concentrate on what’s actually happening at the companies you own.

20. If you study 10 companies, you’ll find 1 where the story is better than expected.

Study 50 and you’ll find 5. There are always pleasant surprises hiding in plain sight.

21. If you don’t study any companies, you have the same success buying stocks as betting at poker without looking at your cards.

No research, no edge. Period.

22. Time is on your side when you own shares of superior companies.

Even if you missed Wal-Mart in the first five years, it was a great stock in the next five years. Time works against you when you own options.

23. If you don’t have time for homework, invest in equity mutual funds.

Diversify across different styles: growth, value, small companies, large companies. Owning six funds that all do the same thing is not diversification.

24. The U.S. market ranked eighth in total return over the past decade.

Consider putting some money in an international fund. Faster-growing economies can deliver better returns.

25. In the long run, a portfolio of well-chosen stocks will always outperform bonds or money-market accounts.

But a portfolio of poorly chosen stocks won’t outperform money left under the mattress. Stock picking only works if you do the work.

The 24-Month Checkup

In the postscript, Lynch comes back one more time to update us on how his 1992 Barron’s picks did over two full years. Some vindicated his thesis. Some proved him wrong.

The wins: Colonial Group gained 69.7 percent. Sun TV more than doubled. Fannie Mae kept delivering despite Wall Street’s constant worrying. The S&Ls continued to be some of the best performers in the entire market. Chrysler had a great year.

The losses: The nursery stocks were a disaster. Lynch admits he deluded himself about the entire gardening industry. He was right that consumers were buying more plants and tools. But he underestimated the competition from discount centers like Kmart and Home Depot. Calloway’s, which looked great at $8, fell to $3. Sunbelt got bought out by General Host, but at $5, which was less than Lynch’s recommended price of $6.25.

The honest confession: Lynch doesn’t hide from his mistakes. He calls the nursery bet a “big mistake” and explains exactly how he was wrong. That kind of honesty is rare in investing books.

Which Rules Resonate Most

Everyone will have their own favorites. Mine are rules 5, 14, and 18.

Rule 5 because it explains why investing is so psychologically difficult. The stock price and the company’s actual performance can go in opposite directions for years. Most people panic during those periods. The ones who stay patient get rewarded.

Rule 14 because the math of investing is inherently optimistic. Your losses are capped. Your gains are not. You just need a few winners in a lifetime to make the whole thing worthwhile.

And rule 18 because there is literally always a reason to be scared. If you wait until there’s nothing to worry about, you’ll never invest at all.

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