It helps to have a glass-half-full attitude when investing in stocks, especially when historical trends back this optimism. Equities have had it rough over the past 12 months, but history tells us U.S. stocks have a track record of eventually recouping their losses and delivering solid returns, especially to those investors who hold their shares through thick and thin. 

Before the next bull market gets underway, it would be a good idea to pick up shares of companies that are down now, but that still have what it takes to be long-term winners.

Let's look at two examples: Shopify (NYSE: SHOP) and Roku (NASDAQ: ROKU). These stocks are among the largest holdings in Cathie Wood's Ark Invest exchange-traded fund, and with good reason.

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Source Fool.com