The phrase "major collectors" refers to people or institutions who have a significant and notable collection of valuable items, such as artwork or rare objects. Full definition
Open to new and existing members, the roster of annual events includes studio tours with artists, behind the scenes home tours with major collectors and invitations to special talks and exhibition previews. (chicagoartistscoalition.org)
But some of the exchanges include much smaller works, some costing as little as $ 15,000 — not exactly the pieces usually pursued by major collectors. (nytimes.com)
By that time art collecting had already become almost pure speculation, with most major collectors buying art through consultants and immediately shipping it to a vault somewhere. (artnews.com)