Lumen is one of the market's hottest stocks today thanks to some big AI news. The stock of Lumen Technologies (LUMN 91.51%) is posting explosive gains in Tuesday's trading. The company's share price was up 87.3% as of 3:15 p.m. ET today, according to data from S&P Global Market Intelligence. In a press release yesterday, Lumen showed that it's benefiting from demand for fiber networks to support artificial intelligence (AI) services. Following the news, the stock received a ratings upgrade and price-target ...