By TheStreet Staff The Arena Group, operator of media brands including Sports Illustrated, TheStreet, and Parade, narrowed its loss on 44% higher revenue and a wider gross margin. The Arena Group, (AREN) – Get Arena Group Holdings, Inc. Report the tech-powered operator of media brands including Sports Illustrated, TheStreet, Parade, and HubPages, narrowed its first-quarter loss on 44% higher revenue and a wider gross margin. The New York company reported a loss of $18.4 million, or $1.20 a share, for the quarter, compared with $25.5 million, or $2.44 a share, in the year-earlier quarter. The l…