Every investor is guaranteed to go through challenging periods on the stock market at some point. When that happens, it is tempting to resort to panic selling. But unless the prospects of the companies whose shares one owns have changed, panic selling is rarely the right move.

It's usually best to stay put through downturns and heightened periods of volatility. Doing so will lead to greater returns over the long run, at least for the right stocks. After last year's bear market, many investors undoubtedly have stocks in their portfolios that remain substantially down over the trailing-12-month period.

Here are two that I own and intend to keep despite their poor recent performances: (NASDAQ: ROKU) and Block (NYSE: SQ). Let me explain. 

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Source Fool.com