Have Lumen's AI opportunities become dramatically overblown? Lumen (LUMN -14.54%) stock sank in Tuesday's trading. The company's share price ended the daily session down 14.5%, according to data from S&P Global Market Intelligence. Lumen fell today following a new short report on the stock published by Kerrisdale Capital. The short-seller revealed it had made an investment betting against the telecom company and laid out reasons it believed recent bullish momentum for the stock was unwarranted. Kerrisdale t ...