By Liam Pleven 

Investors could be easily dazzled by the current stars of the stock market and tempted to ditch boring index funds for a piece of the action.

Twitter shares have gained 41% this year through Thursday. Apple is up 14%, after rising for six years in a row. Shares of Kraft Foods Group have shot up 45% since March 24, the day before a proposed merger with H.J. Heinz was announced.

Not bad in a year when the S&P 500 is up less than 1%.

But consider this sobering fact: Even when the market is up, many stocks drop. Last year, when the S&P was up 11%, 125 stocks in the index fell, says S&P Dow Jones Indices.

Owning individual stocks is risky. Most investors are better off buying low-cost funds that hold broad buckets of stocks, because consistently picking winners is difficult, if not impossible--and picking losers can be costly.

If you're still inclined to roll the dice, consider these tips:

-- Invest only a small slice of your portfolio in individual stocks.

-- Keep trading to a minimum, because the cost of buying and selling makes it even harder to come out ahead.

-- Be especially cautious about loading up on shares of the company you work for, because a major problem could threaten its share price and your job at the same time.

-- Think hard before wagering an amount that, if it evaporated, would compromise your lifestyle or make it difficult to reach your financial goals.

According to federal survey data, 14% of U.S. households owned individual stocks outside of retirement accounts in 2013, the most recent year for which figures are available. In those households, stocks typically account for 13% of all financial assets outside of retirement accounts, according to an analysis of the data by the Investment Company Institute, a trade group.

Investors hold individual stocks for many reasons, even if they put much of their money in broad, low-cost funds. They may have a hunch, and spare cash to test it. They may get a discount on shares of their employer. They may inherit stock. They may like the thrill of the game.

But don't forget the game can end badly, says Christopher Jones, chief investment officer at Financial Engines, in Sunnyvale, Calif., which is hired by firms to help employees allocate assets in 401(k) plans.

Four publicly traded companies that had more than $1 billion in assets have sought bankruptcy protection this year, according to data from BankruptCompanyNews.com, which tracks such filings.

Allan Roth, a financial adviser at Wealth Logic in Colorado Springs, Colo., says most investors shouldn't have more than 5% of their portfolio in individual stocks. That means 5% in total, he stresses--not 5% each in a small handful of stocks. Other investors may put the percentage higher or lower, depending on factors such as overall wealth, living expenses and tax planning.

There is the risk of losing money, of course, but good fortune also can bring headaches. What started out as a small slice of your portfolio may balloon into something much bigger, as some longtime Apple investors have found.

One risk is that you come to count on investment gains to maintain your standard of living. If you need the money, you should consider selling all or most of the appreciated stock to lock in those gains, says William Bernstein, who is co-principal of Efficient Frontier Advisors in Eastford, Conn.

If the gains aren't funding your dreams, you could hold on to the stock. Just be sure you won't be filled with remorse if it subsequently tanks.

Similarly, investors who inherit stock should consider selling it to diversify, Mr. Roth says. If that is difficult because the inherited shares came from someone with whom you had a strong emotional bond, consider selling half of it, he says.

"If it does poorly, you can pat yourself on the back for selling half of it," says Mr. Roth. "If it does well, you can pat yourself on the back for keeping half of it."

William Green III, who is 56 years old and lives in Blythewood, S.C., says he and his wife gradually sold off and donated to charity some shares in Exxon Mobil she got from a relative.

At one point, Exxon shares comprised nearly 20% of the couple's portfolio, which Mr. Green says made him "nervous." Now, the stake amounts to less than 10%.

"You do not want to be in one single stock, even if it's the best company in the world," says Mr. Green, who is a psychiatrist. Reducing the holdings, he says, helped him sleep better at night.

Email: Liam.Pleven@wsj.com

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