A seemingly unstoppable flood of money has Vanguard Group Inc. on the brink of claiming a crown that State Street Corp. has held for decades.

Because it's weighted by market cap, the fund's top holdings are identical to the Vanguard S&P 500 ETF's (all of the so-called "Magnificent Seven" stocks are in the group). Unsurprisingly, the Vanguard Total Stock Market ETF's performance correlates highly with the Vanguard S&P 500 ETF.

Vanguard exchange-traded funds (ETFs) are a fantastic choice for retired investors looking to play the long game with their portfolios. Undoubtedly, Vanguard is a name that passive investors can put their trust in.