Institutions
- Alex Reid & Lefevre
- Bauhaus Dessau Foundation
- Beaux-Arts de Paris
- Bernheim-Jeune
- Brooklyn Museum
- Christie, Manson & Woods Ltd.
- Cincinnati Art Museum
- Clark Art Institute
- Durand-Ruel
- E. J. van Wisselingh & Co.
- Einsatzstab Reichsleiter Rosenberg
- Escola de Arte e Superior de Deseño Pablo Picasso
- Fogg Museum
- Foundation E.G. Bührle Collection
- Frederik Muller & Co.
- The Frick Collection
- Galerie Aktuaryus
- Galerie Alfred Flechtheim
- Galerie Eugène Druet
- Galerie Fischer
- Galerie Fritz Gurlitt
- Galerie Georges Giroux
- Galerie Georges Petit
- Galerie Moos
- Galerie Nunès & Fiquet
- Galerie Seligmann
- Galerie Thannhauser
- Gilcrease Museum
- Hamburger Kunsthalle
- Hermitage Museum
- Hirshhorn Museum and Sculpture Garden
- Hôtel Drouot
- Hôtel Rameau
- Jacques Seligmann & Co., Inc.
- Kunsthaus Zürich
- Kunstmuseum Bern
- Leggatt Brothers
- Leicester Galleries
- Leopold Museum
- M. Knoedler & Co.
- Malingue S.A.
- Maria Lassnig Foundation
- Marlborough Fine Art Ltd.
- McNay Art Museum
- The Metropolitan Museum of Art
- Mitsui Memorial Museum
- Munch Museum
- Munich Central Collecting Point
- Musées nationaux
- Museo del Prado
- Museum of Fine Arts Boston
- Museum of Modern Art
- Museum Rietberg
- National Gallery
- National Gallery of Art
- Newhouse Gallery
- Norton Simon Museum
- O'Hana Gallery
- Rijksmuseum
- Rokuharamitsu-ji
- Rosenberg & Stiebel Inc.
- Royal Academy of Fine Arts Antwerp
- Royal Academy of Fine Arts of San Fernando
- Solomon R. Guggenheim Museum
- Stiftung Preußischer Kulturbesitz
- Van Gogh Museum
- Vandyck Gallery
- Vereinigung Zürcher Kunstfreunde
- Wildenstein & Co.
- Yale Center for British Art