Vanguard s&p 500 index fund vs voo July 8, 2019 16 32 64 128 Vanguard s&p 500 index fund etf voo Vanguard s&p 500 value index fund etf voov Vanguard s&p 500 index fund voo Vanguard s&p 500 growth index fund voog Vanguard s&p 500 value index fund voov How to invest in vanguard s&p 500 index fund