Got $1,000 to invest? These 5 Warren Buffett-approved stocks could be smart long-term plays for your portfolio.

In fact, analysis from investing firm Capital Group found that, historically, there's a 33% chance the S&P 500 will earn negative returns over just one year. Over five years, that chance drops to 7%. And over the last 82 years, there's never been a 10-year period in which the index experienced negative total returns.

Warren Buffett donated on Friday another $6 billion of Berkshire Hathaway stock to the Gates Foundation and four family charities, his biggest annual donation since he began giving away his fortune nearly two decades ago.