Snapchat co-founders Bobby Murphy (l) and Evan Spiegel (c) ring the opening bell on March 2, 2017, as NYSE President Thomas Farley looks on.

Back in 2015, Snapchat's investors reached an agreement with CEO Evan Spiegel: If he took the company public, he'd get 3 percent of the company's outstanding shares as a bonus. The move was intended to "motivate him to continue growing our business and improving our financial results," according to Snap's IPO paperwork.

Last week, Spiegel took Snap public. This week, his bonus came in.