There's like a few thousand companies in the index my ETF is following. I don't have opinions on every last one of them. I just (automatically) follow the mar

There's like a few thousand companies in the index my ETF is following. I don't have opinions on every last one of them. I just (automatically) follow the market consensus. Keep in mind that index funds are generally really, really keen to lend out their shares to short sellers, too.