Market manipulation is a crime under the Securities Exchange Act of 1934. You can't buy things to influence the price or the market, only to use or resell.
Do you think OpenAI plans to trade the semiconductor market? This would only apply in that scenario.
That'd probably make more sense if there wasn't also 50 other tech companies buying up RAM for the same reason (a sudden huge spike in demand due to AI taking off).
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The law you refer to applies only to markets for securities. RAM is very clearly not a security, it fails the Howey test.
There are similar laws prohibiting the manipulation of commodity markets but I do not believe a US court would find RAM to be a commodity.