Key TakeawaysNvidia said that the company has not been subpoenaed by U.S. regulators.Reports on Tuesday indicated that the chipmaker received a subpoena from the Department of Justice as part of an antitrust investigation. Nvidia's shares fell again Wednesday, extending a recent decline that has cut into the stock's recent upward run. Artificial intelligence (AI) chip maker Nvidia (NVDA) said Wednesday that it has not received a subpoena from the Justice Department, issuing a statement a day after reports ...