Private equity firms GI Partners and TA Associates completed an investment in Rectangle Health, a provider of healthcare financial technology. Financial terms were not disclosed. "It has been a pleasure partnering with TA Associates over the past four years to build Rectangle Health into a leader in the healthcare market. We are excited to create our next chapter in partnership with GI Partners and TA, with a continued focus on organic growth and M&A," Dominick Colabella, Rectangle Health CEO.