Nvidia (NASDAQ: NVDA) stock posted significant gains in Wednesday's trading following bullish artificial intelligence (AI) news. The company's share price closed out the day up 4.4% amid the backdrop of a 0.

Now that it's the world's most valuable company, some investors might believe the time to buy Nvidia has already passed, but these developments show that's not the case. Furthermore, the stock is currently selling for just 32 times next year's expected sales, a remarkably attractive price for a company with so much opportunity.

Nvidia is once again the most valuable U.S. company, outranking Apple for the first time since late November. A rise in the chip maker's stock meant it ended Tuesday with a market capitalization of $3.

There are no guarantees in investing. That's the hard truth we all have to learn. Some investments come with low risks while others have a high risk of not working out, but none come with zero risks.