You can also invest in solid blue chip stocks which make for safe long-term buys, and attain some incredible returns. If you invested in these companies five years ago, you would be up over 380% (returns as of Oct. 1). Five years ago, it was already known as a large tech company with reliable databases. Oracle's business has grown at a much steadier pace than Nvidia's over the years, but it's nonetheless still a top AI stock. Its forward P/E of 24 makes it the cheapest growth stock on this list to consider.