Marathon Digital Holdings (MARA), one of the largest publicly traded crypto miners in North America, reported a narrower-than forecast first-quarter loss per share as a rising bitcoin price and increased production helped lift the Florida-based company back toward profitability. The company also said it received another subpoena from the U.S. Securities and Exchange Commission (SEC), which is looking into related-party transactions, among other things, that may have violated federal securities law. The company said it is cooperating with the investigation.