The 5 things you need to know before the stock market opens today: shares of Coinbase and Roku are both tumbling after the companies reported quarterly results, but each stock is still up over 50% and 30% for the year, respectively. Nvidia has denied that its chips have “back doors,” amid scrutiny from Chinese regulators, CSX is reportedly speaking with Goldman Sachs about buying a rival, and shares of Reddit popped after the company reported its most profitable quarter ever. 

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