Constant
2005 Trudy Nieuwenhuys-van der Horst (Legacy Art Collection Constant)
2008 Trudy Nieuwenhuys-van der Horst, long-term loan Stedelijk Museum Schiedam, NL
2012 Fondation Constant, long-term loan to Stedelijk Museum Schiedam, NL
2023 Fondation Constant, long-term loan to Centraal Museum Utrecht, NL