The Canadian four-piece has announced the sad news via Instagram, thanking fans for their support.
"We are extremely grateful for the support we've received over the past few years," the post reads. "What seemed to us like an unimaginable reality came to be, and we have been thrilled to share the ride with you."
"It's been an honour and a gift to meet, work with, and play for so many wonderful people. We feel lucky and hugely grateful for the many fantastic opportunities that came our way. We're all going to be starting fresh chapters in our lives: new projects, new music, new creative ventures, and new experiences to come."
Finn, who is preparing to film the fourth season of "Stranger Things", formed the indie rock band with Ayla Tesler-Mabe, Jack Anderson, and Malcolm Craig in 2017.