First, Sotheby's (BID) is the public proxy for this trend, given its core auction and valuation business around paintings by male artists, making BID the primary direct play. For broader exposure, consider eBay (EBAY) and Etsy (ETSY), which monetize online art trading and resale across painting categories and price points. Entrepreneurial angles include launching a curated online gallery or provenance-enabled platform focused on male painters, or investing in related art-services firms (framing, conservation, insurance) that benefit from ongoing art-market activity.