Athene, a retirement services company, agreed to acquire a 15% stake in Challenger, an investment management firm, from Caledonia, a self-managed investment trust, for $480m. “Today’s announcement by Athene is a strong endorsement of Challenger’s market position and long-term growth prospects from a leading international retirement services provider. We look forward to working with Athene and Apollo as we continue to pursue our shared purpose of providing customers financial security for a better retirement," Richard Howes, Challenger Managing Director and CEO.