Refers to a person who carries or possesses something, often used in legal or formal contexts (e.g., ticket holder, license holder).
The holder of this ticket must present it upon entry.
The license holder is obligated to carry it at all times.
保持者 also means 'holder', but is more abstract (e.g., record holder, rights holder), whereas 所持人 is more concrete (e.g., ticket holder).
Compound of 所持 (shoji, 'possession') + 人 (nin, 'person'). The exact historical derivation is uncertain, but the meaning is transparent from its components.