Everyone who owns shares in companies can often vote. Hardly any ever do. Your shares are voted by “proxy”, which is in your account agreement, unless you actively pursue it. It’s easy to do too, you can vote them on line these days.
On a similar note, if you don’t want those shares loaned out for short sales, you can place sell orders on them for extended periods at prices well over the current trading range which ties them up.
That’s good info for companies that are publicly traded, which Vanguard is not, since it’s a mutual company. (Vanguard is what we were talking about.)