- Business
- Spectrum Group International, Inc. (SPGZ) operates as a global trading and collectibles network, functioning as a trader of precious metals and an auctioneer of rare coins, paper currency, stamps, arms, armor, militaria, wine, and other memorabilia targeting collectors, dealers, and investors; the company offers loans collateralized by precious metals, rare coins, and collectibles through its Trading and Collectibles segments, with the latter encompassing an integrated network specializing in numismatics and fine vintage wines spanning modest to ultra-high-end price points. Founded in 1981 and headquartered in Irvine, California, with additional operations in the United States, Europe, and Asia, Spectrum Group conducts business through subsidiaries including Stack's Bowers Galleries, a leading rare coin and currency auction house and dealer in numismatic and bullion products, and Spectrum Wine Auctions, a provider of online auctions, retail sales, and refrigerated storage for fine and rare wines. In February 2025, A-Mark Precious Metals, Inc. completed its acquisition of 100% of Spectrum Group's outstanding stock for $92 million in cash and stock consideration, integrating the company into A-Mark's precious metals platform to expand into high-margin collectibles markets and leverage synergies in sourcing, logistics, and customer cross-selling.