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Is this legal: going long on call options and artificially increasing the price of the underlying asset seconds before expiration?
Despite the fact that I think there is a litany of inaccuracies and misunderstandings related to quoted price and transaction price and the way prices move and assets transact; if you were able to, under these extremely narrow and very unlikely conditions, affect the prices of these assets that would be market manipulation in the eyes of the SEC. Link to the SEC page about market manipulation.