Gilde Healthcare, a specialized European healthcare investor, and Viking Global, an investment firm, led a $125m investment in Mainstay Medical, a medical device company, with participation from Ally Bridge Group, Sofinnova Partners, Fountain Healthcare Partners, and Perceptive Advisors. “We are excited to lead this financing and to work with Mainstay to continue to unlock the potential of ReActiv8 therapy. Patients with mechanical chronic low back pain have had very limited treatment options, and the restorative mechanism of action offered by ReActiv8 is both unique and very promising," Geoff Pardo, Gilde Healthcare Partner.