Refers to the owner or holder of a collection, stored item, or asset, often in formal or institutional contexts (e.g., art collections, archives, securities).
The owner of this painting wishes to remain anonymous.
The library is known as a holder of rare books.
保持者 means 'holder' in the sense of possessing a right, qualification, or record, whereas 所蔵者 is used for tangible items or collections.
Compound of 所蔵 (shozō, 'possession, collection') + 者 (sha, 'person'). The exact historical derivation is straightforward; the word is a modern formal term.