Japanese Company Suffixes: KK, GK, Yūgen — What They Mean

Japanese company names often include an entity marker that appears before or after the distinctive name. English materials may translate, abbreviate, or omit it. Understanding the marker helps you search records and compare documents, but the 13-digit corporate number remains the stronger identifier.

Kabushiki kaisha and KK

株式会社 is commonly romanized kabushiki kaisha or kabushiki gaisha and abbreviated KK or K.K. English names may use Corporation, Inc., Co., Ltd., or no translated marker. The Japanese words can appear before the name, as in 株式会社〇〇, or after it, as in 〇〇株式会社.

This is a joint-stock company form. Do not infer size, public listing, or financial strength merely from the form. Many privately held businesses use it.

Gōdō kaisha and GK

合同会社 is romanized gōdō kaisha or godo kaisha and often abbreviated GK or G.K. It is a limited-liability company form introduced under the Companies Act framework. English materials sometimes call it an LLC, though cross-border readers should avoid assuming it is identical to an LLC in another jurisdiction.

As with KK, the form describes legal organization, not transaction quality or scale. Compare the legal name and corporate number.

Gōmei and gōshi kaisha

合名会社 is gōmei kaisha, and 合資会社 is gōshi kaisha. These are older partnership-oriented company forms with different member-liability structures. They are less common in new international-facing businesses but still appear in records.

When legal liability structure matters, obtain professional advice and current registry evidence rather than relying on a short translation.

Yūgen kaisha

有限会社, yūgen kaisha, is often translated as limited company and abbreviated YK. New yūgen kaisha can no longer be formed under the current company-law structure, but existing entities may continue under transitional treatment and still use the name.

Finding 有限会社 is therefore not automatically an error or an obsolete record. Check the current corporate-number status and registered details.

Non-company corporations

Public datasets also contain other legal persons. 一般社団法人 and 一般財団法人 are general incorporated associations and foundations. 公益社団法人 and 公益財団法人 have public-interest forms. 医療法人, 学校法人, and 社会福祉法人 identify medical, educational, and social-welfare legal persons.

NPO法人 is commonly used for a specified nonprofit corporation, whose formal Japanese wording is 特定非営利活動法人. These forms have distinct governing rules and purposes. Do not normalize all of them into “company” when the exact form is relevant.

Why English names vary

The National Tax Agency dataset may include an English name, but it is absent for many entities. A company can use a trading style, brand, domain name, or translation different from the Japanese legal name. Punctuation and spacing also vary.

For searching, normalize full-width and half-width characters, letter case, dots, commas, spaces, and common entity markers. Then compare addresses and the corporate number. JapanCompanyCheck applies these normalization steps to its name index.

How to compare two names

Break each name into the distinctive portion and the legal-form marker. Check whether the Japanese characters match, whether a translation or romanization is plausible, and whether the address and number align. Common romanization differences include long vowels, hyphens, and the rendering of gaisha versus kaisha.

Do not conclude a match from the distinctive word alone. Common geographic, family, and industry terms can produce many similar legal names.

Use the number as the anchor

Ask for the corporate number, search the JapanCompanyCheck checker, and record the exact Japanese legal name. Use the corporate-number guide to interpret status and change data. If an invoice shows a T-number, compare it with the steps in the invoice-registration guide.

For a formal question about entity type, officers, or registered matters, obtain the appropriate commercial registry certificate. English abbreviations are convenient search aids, not substitutes for the Japanese record.