Thrivent Financial For Lutherans is the nation's largest fraternal benefit society. From its beginnings more than a century ago as a mutual benefit society for immigrants, Thrivent has evolved into a Fortune 500 financial services company, with 2.6 million members and more than $67 billion in assets that it manages. It remains a membership-based not-for-profit organization. It provides an entire range of financial services for members, including banking, life insurance and investment advice and opportunities, including mutual funds, annuities, IRAs and college savings plans.