How to say "equity" in Japanese

• 持ち分もちぶんCommon
  nounCovers one's share or stake — equity in a company or one's portion of shared expenses. It is the natural choice for financial ownership interests rather than the abstract legal principle.
  我々われわれの同社どうしゃにおける持分もちぶんは、６０％です。↗

  Our ownership in the company is 60%.
• エクイティ
  nounA loanword used for 'equity' in finance and business talk, such as equity investment or equity financing. Best when the English term itself is used in the context; avoid it in ordinary everyday sentences.
• 衡平法こうへいほう
  nounThe legal-system sense: equity as the body of law developed alongside common law. Use it only when discussing law courts and legal doctrine, not for money or fairness in general.
• 公義こうぎ
  nounMeans justice or fairness in an abstract, ethical sense. For 'equity' in the everyday feeling of justice it can work, but it is seldom the word you want; 正義 or 公平 are usually meant instead.
• 衡平こうへい
  noun, na-adjectiveDenotes balance or evenhandedness, so it suits 'equity' only in the abstract sense of fairness. It is a formal, marginal choice; for legal equity say 衡平法, for finance say 持ち分 or エクイティ.

For business ownership use 「持ち分」 or 「エクイティ」; for the legal sense of equity use 衡平法; 公義 and 衡平 cover justice/fairness senses and are rarely the word you want for 'equity'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 持ち分もちぶんshare (of expenses)
• エクイティequity
• 衡平法こうへいほうequity
• 公義こうぎjustice
• 衡平こうへいbalance