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Microsoft was blindsided by OpenAI's ouster of CEO Sam Altman
(www.axios.com)
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Company A was created independently. In a sense, it owned itself. After a while Company A decided it needed capital or a close business partner. Company A told company B "We will sell you a 49% share of our company for capital and close business relations." Company B accepted. Now what happened to the other 51%? They're still with Company A, so we can say that Company A owns shares of itself.