Deloitte Touche Tohmatsu LLP

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Deloitte Touche Tohmatsu LLP
Founded 1845
Headquarters New York City
Key People John P. Connolly Chairman, Jim Quigley CEO
Employees 170,000
Products Audit, Tax, Consulting, Enterprise risk, and Financial advising
Releases Company News

Deloitte Touche Tohmatsu LLP (DTTL) is a UK private company that has several independent member firms throughout the world that provide audit, consulting, financial advisory, risk management, and tax services to selected clients. It is one of the largest professional services firms in the world and one of the 'big four' auditors, along with PricewaterhouseCoopers, Ernst & Young, and KPMG.[1]

DTTL does not itself provide services to clients. DTTL and each DTTL member firm are separate and distinct legal entities, which cannot obligate each other. DTTL and each DTTL member firm are liable only for their own acts or omissions and not those of each other. Each DTTL member firm is structured differently in accordance with national laws, regulations, customary practice, and other factors, and may secure the provision of professional services in its territory through subsidiaries, affiliates, and/or other entities.[2]


The firm began in 1845, when William Welch Deloitte opened his own accountancy office on Basinghall Street in London.

Products and Services[edit]

DTTL member firms offer clients a broad range of audit, consulting, financial advisory, risk, and tax services.

Key People[edit]


  1. Deloitte Touche Tohmatsu Company Profile. WorldLingo.
  2. About Deloitte. Deloitte Touche Tohmatsu LLP.