3Play Media, a cloud-based video accessibility platform and a portfolio company of Boston-based private equity firm Riverside Partners, has acquired Captionmax and its subsidiary National Captioning Canada.

Captionmax is a provider of high-quality, secure live and pre-recorded captioning, audio description, and localization services for customers across multiple end-markets. The deal expands 3Play Media’s geographic footprint across North America and enhances its entry into live captioning services.

“We founded 3Play Media over a decade ago as a proprietary platform marrying technology with people to meet the growing and evolving inclusion needs of our customers,” said Chris Antunes, co-CEO of 3Play Media. “The acquisition of Captionmax will allow us to serve our combined customers better with a broader set of solutions and even greater scale.”

Hennepin Partners served as financial advisor and Fredrikson & Byron P.A. served as legal counsel to Captionmax on this transaction. Choate, Hall & Stewart LLP served as legal counsel to 3Play Media.