I know of only a few publicly traded companies with numismatic connections:
ebay (
ebay)
Collectors Universe (CLCT), which owns PCGS
Amazon (
Amazon sells coins) (AMZN)
Sotheby's (BID)
Poly Culture Group Corp. Ltd. (owns Poly International Auction Co. Ltd.) (Hong Kong Stock Exchange 3636

HK)
Are there others? What other major auction houses are publicly traded? Christie's used to be traded on the London market, but it was bought and taken private. Any public publishers with significant numismatic presence? Public supply manufacturers? Anything else on non-US markets?