One share is split into two, doubling the number of shares, with the price per share adjusted accordingly. Seeing the number of shares in your account increase can easily create the illusion that you've gained something, but the total value of your holdings doesn't automatically increase because of the split.
That's also what the SEC's explanation means. A lower post-split share price may make the stock more affordable to buy, but it doesn't mean the company's profits, assets, and competitiveness have doubled overnight.
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