US STOCKS-S&P 500 up, Nasdaq at record high as megacap tech stocks rise

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* Indexes: Dow down 0.06%, S&P 500 up 0.50%, Nasdaq up 0.77% * PTC surges on Schneider Electric's $22.6 billion bid * Cerebras gains after OpenAI CEO Altman calls co a "close partner" (Updates for

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