Chipotle Mexican Grill (NYSE: CMG) has been one of the best-performing stocks on the market since its initial public offering (IPO) in 2006, but despite gaining more than 5,000%, the stock had never once split.

That's about to change. The burrito roller said after hours on Tuesday that its board of directors had approved a 50-for-1 stock split, which it said would be one of the biggest stock splits in the history of the New York Stock Exchange. The split is subject to shareholder approval at the company's annual meeting on June 6. If it's approved, the stock will begin trading on a post-split basis on June 26.

CFO Jack Hartung said the stock split "will make our stock more accessible to employees as well as a broader range of investors," and noted that the stock is at an all-time high due to record revenue, profits, and growth. Chipotle also announced a special one-time equity grant for all restaurant general managers and crew members with more than 20 years of service.

What Chipotle's stock split means for investors

Chipotle's shares jumped 5% after hours on the news, indicating that investors are clearly pleased with the stock split. However, investors should understand that a stock split doesn't do anything to change the fundamentals of the stock. It simply splits the pie into more pieces. Investors' individual holdings will remain the same, and they will have the same claim to Chipotle's profits that they did before.

There is some evidence that stocks outperform following a stock split, but that's not necessarily a direct consequence of a split. Stock splits tend to come when a business is already performing well as a split happens after a stock has risen enough to justify it in the eyes of the board of directors. Stock splits can also attract momentum investors as it acts as something of a milestone for the stock's growth.

In some ways, Chipotle's stock split seems like it's overdue. The stock was approaching $3,000 a share when the news was announced, giving it one of the highest individual share prices on the S&P 500. A 50-for-1 split will bring that price below that of many of its peers, to around $60 if its current price holds.

Is Chipotle stock a buy?

Except for a few difficult years in the wake of its E. coli outbreak, Chipotle has been a phenomenal business and stock over its history. The company pioneered the fast-casual restaurant segment, and it has spawned a raft of imitators with similar concepts but different cuisines. That's because Chipotle has built a great business model, especially after having adapted to the digital era, and its customers love its product.