Signature Group Holdings Inc. has purchased Global Recycling and Specification (GRSA) Alloys from Aleris Corp. for $525 million. Sherman Oaks, Calif.-based Signature said the Cleveland-based GRSA is the largest independent aluminum recycler in the world and positioned to take advantage of the improving fundamentals affecting the global aluminum markets. The purchase by the investment firm is Signature’s first in the aluminum market, according to a news release.