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EY ShinNihon LLC (EY 新日本有限責任監査法人)

Confidence: Likely Updated 2026-05-24 Review by 2026-11-20 Sources 8 Machine-translated Original (JA)
#JapanFG#audit#big4#assurance#accounting#ey
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This entry sits under financial-regulators INDEX. Read it alongside Deloitte Touche Tohmatsu LLC (Deloitte Touche Tohmatsu) and Kpmg Azsa for peer Big 4 audit context, and Financial licenses for the regulatory boundary around the Certified Public Accountants Act (公認会計士法) / audit quality management. For the CPAAOB inspection system and auditor disclosure in listed-company filings, read together with the jurisdictional context of FSA Supervision Bureau and Strategy Development and Management Bureau (FSA Strategy Development and Management Bureau).

1. Firm overview

  • Official name: EY ShinNihon LLC (EY 新日本有限責任監査法人)
  • English name: Ernst & Young ShinNihon LLC
  • Headquarters: Yūrakuchō, Chiyoda-ku, Tokyo (Tokyo Midtown Hibiya, etc.)
  • Representative: Chairman (fixed-term)
  • Member network: EY (Ernst & Young) Global (London headquarters)
  • Affiliated firms: EY Tax Co., EY Strategy and Consulting, EY ShinNihon Sustainability, etc.

2. History / lineage

Year-monthEvent
2007-07Restructuring period following the Kanebo accounting-fraud case and the dissolution of ChuoAoyama Audit Corporation (ChuoAoyama, of the PwC line, was suspended → industry restructuring)
2008-07Introduction of the limited-liability audit corporation system through amendment of the Certified Public Accountants Act → major firms converted to limited liability one after another
2014-06Issues from the ShinNihon audit era preceding the Toshiba inappropriate-accounting case third-party committee report (in later years) (Toshiba was a ShinNihon client at the time)
2015-12The FSA issued a business improvement order + administrative monetary penalty against ShinNihon Audit Corporation (21 億円) — related to the Toshiba inappropriate accounting ★
around 2018 ~Integration into the “EY ShinNihon” brand — EY global brand consolidation
2020sStrengthening of the Financial Services Office’s crypto-asset, sustainability, and IFRS teams

3. Financial Services Office (FSO)

EY ShinNihon’s Financial Services Office is an FS-dedicated organization providing cross-cutting coverage of banking, insurance, securities, asset management, and crypto-assets. It is linked with EY Global’s FSO network .

Main sectors

Sub-sectorMain targets
Megabanks / major banksmufg-line accounting-audit-related work, part of regional-bank groups
Life and non-life insuranceMajor life and non-life insurers, foreign-affiliated life and non-life insurers
Securities / asset managementMajor securities firms, asset managers, trust banks
Crypto-assets / Web3Financial-statement audit and segregated-management audit of FSA-registered VASPs (see japan-crypto-audit-firm-landscape)
Regulatory responseIFRS, US standards, J-SOX, SOC reports

Service lines

  • Statutory audit (Companies Act + Financial Instruments and Exchange Act)
  • Segregated-management audit (for VASPs, Payment Services Act)
  • Internal control audit (J-SOX)
  • SOC 1 / SOC 2 reports
  • IFRS / US-GAAP advisory
  • IPO support (stock-exchange preparation)
  • Sustainability assurance (SSBJ / ISSB related)

4. Major listed-FG client relationships (public basis)

Within the range verifiable from auditor disclosure in securities reports (有価証券報告書) on EDINET and from each company’s disclosure materials, representative examples of major financial institutions for which ShinNihon (the EY line) has served / currently serves as auditor:

  • mizuho-fg Mizuho Financial Group — EY ShinNihon is the accounting auditor (among the megabank 3 groups, the split is Mizuho FG = EY ShinNihon, Mitsubishi UFJ FG = Tohmatsu, Sumitomo Mitsui FG = Azusa)

Note: Because auditor changes can occur frequently under the Companies Act + FIEA, the latest auditor-appointment status should be verified using as a primary source either the “Status of the Auditor” section of each company’s latest securities report on EDINET or the JICPA public search. This entry does not guarantee point-in-time information.

5. Regulation / supervision

  • Governing law: Certified Public Accountants Act (法律 No. 昭和 23 年-第 103 号)
  • Registration: Registered as an audit corporation with the Japanese Institute of Certified Public Accountants (JICPA)
  • Supervision: The FSA’s Certified Public Accountants and Auditing Oversight Board (CPAAOB) conducts quality-management reviews / inspections
  • Industry self-regulation: JICPA industry-committee practical guidelines (for crypto-assets, see 第 61 号)

CPAAOB inspection / disposition history

  • 2015-12 business improvement order + approximately 21 億円 administrative monetary penalty (triggered by the Toshiba inappropriate accounting) ★
    • FSA-published disposition. The largest-scale administrative disposition in ShinNihon’s history

6. Competitive relationships (within the Big 4 )

Big 4Domestic brandStrength axis (public basis)
Deloitte[[financial-regulators/deloitte-touche-tohmatsuトーマツ]]
PwC[[financial-regulators/pwc-aarataあらた]]
KPMG[[financial-regulators/kpmg-azsaあずさ]]

In the mid-tier (Tier 2) there are Taiyo Grant Thornton, BDO Sanyu Audit Corporation, and others, which handle regional banks / mid-sized companies .

Sources

[!info] Verification status confidence: likely (based on v1.0 public sources, 2026-05-24). The firm’s legal form, historical disposition (2015 Toshiba-related penalty), Big 4 lineage, and FSO structure are highly reliable on a public basis. The specific auditor-appointment status by client should be verified each time against each company’s latest securities report on EDINET (no point-in-time guarantee).