The SunTrust Banks Inc. 401(k) Plan had $3.3 billion in assets as of Dec. 31, 2017, according to its latest Form 5500 filing. As of that date, investment assets were $2.9 billion in Vanguard mutual funds, $321 million in SunTrust common stock and $2.7 million in Federated Prime Obligations mutual fund. The SunTrust Banks Inc. Retirement Plan, a cash balance plan frozen in December 2011, had assets of $3.1 billion as of Dec. 31, 2017, and was 115.6% funded. Its asset allocation is 49% stocks and 51% investment grade debt.