 OLDWICK, N.J.--BUSINESS WIRE--AM Best has upgraded the Long-Term Issuer Credit Rating Long-Term ICR to bbb from bbb, the existing Long-Term Issue Credit Ratings Long-Term IRs and the indicative Long-Term IRs of Athene Holding Ltd. Athene NYSE:ATH Bermuda. Concurrently, AM Best has upgraded the Long-Term ICRs to a from a and affirmed the Financial Strength Rating FSR of A Excellent of its insurance subsidiaries. The outlook of the Long-Term ICRs has been revised to stab 