Many Vanguard mutual funds offer ETF as a share class of the fund. For those funds, shares in the traditional share classes can be exchanged for ETF shares, if

Many Vanguard mutual funds offer ETF as a share class of the fund. For those funds, shares in the traditional share classes can be exchanged for ETF shares, if you hold them at Vanguard. But not all of the funds have an ETF share class. And if you hold Vanguard mutual funds elsewhere, you'd need to transfer them in-kind to Vanguard to convert.