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> But it’s still investing in oil companies and giving them more money.

Buying shares on the market from third parties does not give the company more money.

Not immediately, but companies can take advantage of the higher price by issuing stock.

For example, GameStop raised over a billion dollars while Redditors were trying to get rich by memeing it to the moon.

Not directly but it makes the price go up so the company can raise money easier, issue new shares at the higher price, etc.