NEW YORK — Snap Inc. stock prices took a fall surrounding the controversial ad it displayed of Pop singer Rihanna and Chris Brown. Snapchat then removed the ad, which was for a mobile game called Would You Rather, and apologized, saying it was a mistake.

Rihanna caught wind of the ad and called the ad from the Los Angeles-based company “disgusting.” Snap Inc. stock fell almost 5 percent, slidding 4.5 percent to $17.05 at 1:46 p.m. in New York.

“Now Snapchat I know you already know you ain’t my fav app out there,” Rihanna wrote Thursday in an Instagram story, “but I’m just trying to figure out what the point was with this mess! I’d love to call it ignorance, but I know you ain’t that dumb!”

She said Snap let down victims of domestic violence, which she experienced while dating Brown in 2009. “Shame on you,” she wrote.

Reality-TV star Kylie Jenner earlier this year criticized a redesign of the app.

The ad “never should have appeared on our service,” Snap said. “We are so sorry we made the terrible mistake of allowing it through our review process. We are investigating how that happened so that we can make sure it never happens again.”