Refers to a portion of ownership, expenses, or rights that a person or entity holds. Common in business, legal, and everyday contexts such as splitting costs or owning company shares.
シェア is a loanword often used for market share or sharing in a general sense, while 持ち分 is more formal and often used in legal or financial contexts.
Etymology
Compound of 持ち (mochi, 'holding') + 分 (bun, 'portion, share'). The kanji 持 means 'to hold' and 分 means 'part, share', together conveying the idea of a held portion.