Haskins and Sells

Deloitte
	File:Deloitte logo.svg Deloitte logo
Company type	Private company limited by guarantee
Industry	Professional services
Founded	1 January 1845; 181 years ago in London, United Kingdom
Founder	William Welch Deloitte
Headquarters	London, United Kingdom
Area served	Worldwide (over 150 countries)
Key people	William G. Parrett (former CEO), Jerry Leamon (former brand leader)
Products	Audit, consulting, financial advisory, risk advisory, tax, legal assistance
Revenue	US$67.2 billion (FY 2024)
Number of employees	Around 460,000 professionals (2024)
Parent	Deloitte Touche Tohmatsu Limited
Website	www.deloitte.com

Adapted from the English Wikipedia article Haskins and Sells, available under CC BY-SA 4.0Updated 9 August 2025

Deloitte is a global professional services network headquartered in London, United Kingdom. It ranks as the largest professional services organization worldwide by both revenue and workforce size, and is one of the Big Four accounting firms, alongside EY, KPMG, and PwC. The network is composed of independent member firms affiliated with Deloitte Touche Tohmatsu Limited (), a private company limited by guarantee incorporated in England and Wales.

The firm was established in London in 1845 by accountant William Welch Deloitte and expanded its operations to the United States by 1890. In 1972, it merged with Haskins & Sells, forming Deloitte Haskins & Sells, followed by a merger with Touche Ross in 1989 to create Deloitte & Touche. The international organization adopted the name Deloitte Touche Tohmatsu in 1993, which was later shortened simply to Deloitte. In 2002, it absorbed Arthur Andersen’s UK practice along with several offices across Europe and America. Among its significant acquisitions is Monitor Group, a prominent strategy consulting firm acquired in January 2013. Deloitte functions as a UK private entity supported by a network of legally independent member firms.

With around 460,000 professionals operating in over 150 countries, Deloitte delivers services including audit, consulting, financial advisory, risk advisory, tax, and legal assistance. The network reported revenues of US$67.2 billion for the fiscal year 2024. The company has also been involved in sponsoring major events such as the 2012 Summer Olympics.

In September 2017, Deloitte faced a major cybersecurity breach that compromised client confidentiality and employee information. Additionally, the firm has encountered legal challenges related to its auditing activities.

Early history

In 1845, William Welch Deloitte established his practice on Basinghall Street in London, becoming the first independent auditor for a public company—the Great Western Railway. By 1880, the firm had expanded into New York City. Between 1855 and 1905, its office was located at No. 4 Lothbury before relocating to No. 54 London Wall Buildings.

Deloitte opened its first international branch on Wall Street in 1890 under the management of Edward Adams and P.D. Griffiths; subsequent offices were launched in Chicago and Buenos Aires. Griffiths later became a partner at the London headquarters.

In 1896, Charles Waldo Haskins and Elijah Watt Sells founded Haskins & Sells in New York, recognized as the first major auditing firm established by American accountants rather than British.

George Touche founded his London office in 1898 and partnered with John Ballantine Niven in 1900 to establish Touche Niven in New York.

On March 1, 1933, Colonel Arthur Hazelton Carter from Haskins & Sells testified before the U.S. Senate, influencing legislation that required independent audits for publicly traded companies.

In 1947, Detroit-based accountant George Bailey created an organization that merged within a year with Touche Niven and A. R. Smart to form Touche, Niven, Bailey & Smart. Under Bailey’s guidance, the firm grew swiftly by developing management consulting services and enhancing connections with affiliates in Canada and Britain. Renamed Touche Ross in 1969, it incorporated Japan’s Tohmatsu Aoki & Co in 1975. In 1972, Chairman Robert Trueblood headed a committee that recommended establishing the Financial Accounting Standards Board.

Deloitte relocated its headquarters to No. 128 Queen Victoria Street in London in 1964. The merger between Deloitte (then known as Deloitte, Plender, Griffiths & Co.) and Haskins & Sells occurred in 1972, forming Deloitte Haskins & Sells.

In the United States during 1989, Deloitte Haskins & Sells combined forces with Touche Ross to create Deloitte & Touche under joint leadership of J. Michael Cook and Edward A. Kangas. Some UK member firms of Deloitte Haskins & Sells declined this merger and instead joined Coopers & Lybrand to form Coopers & Lybrand Deloitte (which later became part of PwC). Similarly, certain Touche Ross member firms merged with other entities; for instance, in the UK, Touche Ross joined with Spicer & Oppenheim in 1990.

Recent history

During the formation of Deloitte & Touche through US-led mergers, the firm encountered challenges in securing exclusive rights to the names "Deloitte" and "Touche Ross," since prominent entities such as Deloitte UK and Touche Ross Australia were not part of the merger. Consequently, the name DRT International was adopted, representing Deloitte, Ross, and Tohmatsu. This was updated in 1993 to Deloitte Touche Tohmatsu.

In 1995, partners from Deloitte & Touche founded Deloitte & Touche Consulting Group, which is now known as Deloitte Consulting. The year 2000 saw Deloitte acquire Eclipse to bolster its internet design expertise; this acquisition was later divided into Deloitte Online and Deloitte Digital.

After the collapse of Arthur Andersen in 2002, its UK practice—the largest outside the United States—merged with Deloitte UK. Additionally, Andersen’s operations in Spain, the Netherlands, Portugal, Belgium, Mexico, Brazil, and Canada integrated into Deloitte. Separately, Deloitte France spun off its consulting arm, creating Ineum Consulting.

Deloitte's expansion into China included acquiring Beijing Pan-China CPA in 2005, making it the largest accounting firm in China with approximately 3,200 employees before the acquisition. This move was part of a $150 million investment plan spread over five years; notably, Deloitte has maintained a presence in China since 1917.

By 2007, Deloitte had enlisted former CIA personnel to establish its competitive intelligence division known as Deloitte Intelligence. In 2009, following BearingPoint’s bankruptcy, Deloitte purchased its North American public service practice for $350 million.

The firm's real estate footprint grew in 2010 with the acquisition of UK-based property consultancy Drivers Jonas, which was later rebranded as Deloitte Real Estate. In 2011, acquisitions of DOMANI Sustainability Consulting and ClearCarbon Consulting expanded Deloitte’s sustainability offerings.

Deloitte ventured into mobile application development by acquiring Übermind in 2012. Later that same year, it acquired Recombinant Data Corporation to enhance healthcare analytics capabilities; this was integrated with internal units in 2013 to launch ConvergeHEALTH by Deloitte.

On 11 January 2013, Deloitte acquired Monitor Group’s global strategy consulting division—originally founded by Harvard professor Michael Porter—after Monitor declared bankruptcy.

In 2014, Deloitte introduced Rubix, a blockchain consultancy serving clients across multiple industries including government sectors. Blockchain labs were established in Dublin (2016) and New York (2017). Additionally, Deloitte Canada installed a Bitcoin ATM and enabled bitcoin payments at a company restaurant. The firm collaborated with Waves Platform on initial coin offerings and became a member of both the Ethereum Enterprise Alliance and Hyperledger Project in 2017.

The acquisition of San Francisco-based advertising agency Heat occurred in 2016; Heat was recognized for campaigns such as EA Sports’ Madden NFL and Hotwire.com. Heat marked the eleventh digital agency acquired by Deloitte Digital since its inception in 2012; by that time, Deloitte Digital employed around 7,000 people and generated $2.1 billion in revenue during 2015.

In September 2016, Deloitte entered a strategic alliance with Apple aimed at increasing enterprise sales of Apple devices. Over 5,000 consultants support clients through the Enterprise Next initiative.

October 2016 saw the creation of Deloitte North West Europe by merging firms from Belgium, Denmark, the Netherlands, Finland, Iceland, Norway, Sweden, the UK, and Switzerland. This entity began operations on 1 June 2017 with an investment of €200 million over three years to improve services and career development opportunities. It employed roughly 28,000 professionals and produced more than €5 billion annually—accounting for about one-fifth of Deloitte’s global revenue.

In March 2022, amid the Russo-Ukrainian conflict, Deloitte halted operations in Russia and Belarus and separated these offices from its worldwide network. That same month it acquired Etain, a Northern Ireland–based specialist in data and digital transformation.

According to The Wall Street Journal in June 2022, Deloitte explored plans to divide into two separate companies—one concentrating on accounting services and another on advisory functions—mirroring discussions at Ernst & Young.

In November 2023, Deloitte engaged Henchmann to implement its contract drafting and negotiation software designed to extract critical information from legal documents.

In 2024, Deloitte collaborated with Nvidia, Microsoft, and Amazon Web Services to provide $40 million funding toward establishing the Cancer AI Alliance.

By May 2025, facing underwhelming financial results within its UK consulting sector, Deloitte announced intentions to limit salary increases and reduce bonuses by twenty percent.

Name and branding

In 1989, Deloitte, Haskins & Sells combined with Touche Ross in most regions, creating Deloitte & Touche. However, in the United Kingdom, Deloitte, Haskins & Sells merged with Coopers & Lybrand, which is currently part of PwC.

The UK-based private entity is formally known as Deloitte Touche Tohmatsu Limited, initially marketed as DTT International. A rebranding initiative was launched in 2003 under CEO William G. Parrett, led by Jerry Leamon.

Today, Deloitte serves as the global brand uniting independent firms that collaborate to offer services such as audit, consulting, financial advisory, risk management, and taxation.

In 2008, Deloitte unveiled its "Always One Step Ahead" (AOSA) brand platform to reinforce its vision: "To be the Standard of Excellence." This platform underpins the brand's value proposition and complements initiatives like the Green Dot campaign.

By June 2016, Deloitte refreshed its visual identity by adopting a new logo featuring black typography instead of the previous blue.

Within India, Deloitte operates under several brand names including A.F.Ferguson & Co., S.B.Billimoria, Fraser & Ross, and Deloitte Haskins & Sells (India).

Legal structure

For an extended period, the organization and its network of member firms were structured legally as a Swiss Verein (an unincorporated association). Since 31 July 2010, members of this Verein have been incorporated into Deloitte Touche Tohmatsu Limited (DTTL), a UK private company limited by guarantee without share capital. Each member firm within the global network remains an independent legal entity governed by local regulations and professional regulations.

This organizational model, typical among professional services networks, limits joint liability for actions taken by other members. Neither DTTL nor its member firms can bind one another; all professional services are delivered exclusively by individual member firms. This framework shields members from liability arising from other firms' negligence and facilitates membership in the IFAC Forum of Firms.

In 2019, partners in the U.K. earned an average remuneration of £882,000. By 2023, Deloitte U.K. partners maintained average earnings exceeding £1 million for a third consecutive year.

Services

Deloitte’s member firms offer a broad range of services across various functions. Depending on jurisdictional requirements, these firms operate either as a single legal entity or through subsidiaries under a parent organization.

Audit

The audit division provides conventional accounting and auditing services, including internal audit functions, IT control assurance, and Media & Advertising Assurance.

Investors in Guangdong Kelon Electrical Holdings Company Limited alleged that Deloitte failed to warn them about the company’s deteriorating financial health. Deloitte responded by highlighting that it audited Kelon from 2002 to 2004, issued a qualified opinion in 2004 concerning sales and allowances issues, and subsequently resigned after completing that year’s audit due to client management’s insufficient commitment to sound financial practices.

Consulting

Consulting services assist clients with strategy development, analytics, mergers and acquisitions (M&A), customer and marketing strategies, operational improvements, human capital management, and enterprise technology solutions. This segment represents Deloitte’s largest business area, generating over 40% of total revenue in 2021.

Since 2005, Deloitte has been influential in advancing "strategic billing" within healthcare after appointing former U.S. Health Secretary Tommy Thompson as chairman of its global healthcare practice. By 2011, Deloitte was ranked number one worldwide in healthcare consulting across sectors including life sciences, payers, providers, and government agencies.

Deloitte implemented a $95 million SAP HR system for the Los Angeles Unified School District (LAUSD), which initially caused payroll inaccuracies affecting teacher payments. By late 2007, LAUSD had disbursed $140 million to rectify system problems; payroll errors reportedly stabilized below 1% by early 2008.

Additionally, Deloitte contributed to developing a statewide case management system for the California Judicial Council. Originally budgeted at $260 million, costs escalated to nearly $500 million with projections reaching $2 billion. No court achieved full operational status before the project was discontinued in 2012 due to high deployment expenses and budget constraints.

Financial advisory

The financial advisory division provides a broad range of corporate finance solutions, encompassing dispute resolution, both personal and commercial bankruptcy, forensic analysis, e-discovery, document examination, strategic advisory services, mergers and acquisitions support, capital project consulting, and valuation expertise.

Tax and legal

Tax and legal offerings assist clients in increasing net asset value by overseeing transfer pricing and international taxation for multinational corporations, reducing tax burdens, implementing tax compliance systems, and delivering guidance on the tax consequences of business strategies.

In 2013, ActionAid criticized Deloitte for allegedly advising companies on utilizing Mauritius as a means to evade substantial tax obligations in economically disadvantaged African nations. Deloitte responded by asserting that its counsel promotes arrangements consistent with double taxation treaties designed to lawfully lower tax expenses and emphasized that these treaties are intended to foster investment rather than facilitate tax evasion.

GovLab

GovLab serves as Deloitte Consulting LLP’s internal innovation hub dedicated to government transformation within the Federal Government sector. Founded in 2010 and located at New York University, GovLab undertakes research on emerging trends, technological advancements, and evolving business models that influence governmental functions.

Offices

Deloitte maintains a presence in over 700 locations across more than 150 countries, employing close to 457,000 professionals as of 2023.

Operations in India

Deloitte initiated its presence in India during the late 1990s alongside KPMG. Due to ICAI regulations restricting foreign audit firms from practicing in India, Deloitte performs audits through its partnership with C.C.Chokshi & Co., an Indian firm established in 1998. After India’s economic liberalization in 1992, Deloitte secured direct operational licensing. In 2004, A. F. Ferguson & Co., an Indian firm with over a century of history, merged into Deloitte, complementing earlier alliances with CC Chokshi & Company, Fraser & Ross, PC Hansotia & Company, and SB Billimoria & Company.

Within India, Deloitte functions through two entities: Deloitte India catering to local clients and Deloitte US-India (USI), which operates under Deloitte US but is based in India to serve American clientele.

Awards and recognition

In 2017, Deloitte was acknowledged as one of the UK's top employers alongside KPMG, PwC, and PA Consulting Group. It also earned a spot among the leading workplaces for paternity leave according to Fatherly.

For the tenth year running in 2018, Inside Public Accounting ranked Deloitte as the premier accounting firm. Its tax practice received global accolades from ITR, including three consecutive awards for best transfer pricing services in the Americas. Gartner placed Deloitte first worldwide in "Security Consulting Services" revenue for six straight years.

In 2019, Fortune listed Deloitte among the 100 Best Companies to Work For, while Bloomberg Business recognized it as the top organization for launching a career.

Between 2019 and 2021, Gartner consistently ranked Deloitte as the leading consulting services provider globally by revenue.

1MDB scandal

In 2021, Deloitte's Malaysian branch consented to a settlement of $80 million addressing allegations linked to its audit work for 1Malaysia Development Berhad (1MDB) and its subsidiary SRC International between 2011 and 2014. Investigations claim that senior officials and their associates misappropriated at least $4.5 billion from 1MDB during the period from 2009 to 2014.

Adelphia Communications

On April 26, 2005, the Securities and Exchange Commission announced that Deloitte would pay $50 million to resolve accusations related to Adelphia’s financial statements from the year 2000. Later disclosures suggested that the settlement amount might have escalated to figures ranging from $167.5 million up to $210 million.

Autonomy

Following Hewlett-Packard’s acquisition of Autonomy in 2011, accounting discrepancies resulted in an $8.8 billion impairment charge. In May 2018, the UK Financial Reporting Council (FRC) commenced disciplinary proceedings against Deloitte, which served as Autonomy’s auditor at the time, accusing certain partners of neglecting misleading information and lacking impartiality. This action came subsequent to US court convictions of former Autonomy executive Sushovan Hussain for fraud.

In 2020, Deloitte faced a record £15 million fine, while two ex-partners, Richard Knights and Nigel Mercer, were also penalized by the FRC for audit deficiencies.

Banro Corporation audit independence fine

Deloitte Canada was fined $350,000 by the Public Company Accounting Oversight Board for breaches of auditor independence rules during three successive audits of Banro Corporation, a Canadian gold mining firm.

Bondfield Construction

CPA Ontario brought professional misconduct charges against Deloitte partners Felice "Phil" Iorio and Steve Kostich concerning audits performed on Bondfield Construction, which collapsed after filing for creditor protection in April 2019. Former company executives were subsequently sued over fraudulent invoicing that led to financial losses.

Carillion

Prior to its liquidation in January 2018, Deloitte acted as internal auditor for construction conglomerate Carillion. The final report from a Parliamentary inquiry condemned Deloitte’s involvement in Carillion’s financial reporting, characterizing the company’s failure as driven by “recklessness, hubris and greed.”

China Huarong Asset Management Co.

In March 2023, China’s Ministry of Finance imposed a penalty of 211.9 million yuan (approximately $30.8 million) on Deloitte due to shortcomings identified in its audit of China Huarong Asset Management Co. The firm was criticized for insufficient professional skepticism. Additionally, Huarong received an 800,000 yuan ($116,227) fine related to these audit deficiencies.

Johnston Press audit

The UK Financial Reporting Council fined Deloitte’s UK affiliate £362,500 in 2020 and issued formal reprimands to both the firm and an unnamed audit partner over inadequacies found in their audit work for Johnston Press.

Livent

After entertainment company Livent became insolvent, the Ontario Superior Court of Justice ordered Deloitte in April 2014 to pay $84.75 million for failing to uphold appropriate auditing standards on Livent’s financial statements covering 1993 to 1998. This decision was affirmed by the Ontario Court of Appeal in January 2016. However, in December 2017, the Supreme Court of Canada partially granted Deloitte’s appeal, restricting liability solely to negligence related to auditing Livent’s fiscal year 1997 and reducing damages awarded to $40.43 million.

Mitie plc

In April 2022, Deloitte's UK branch was penalized £2 million by the Financial Reporting Council due to shortcomings identified in its 2016 audit of the British outsourcing company Mitie plc.

Philip Services Corp

The Canadian metals recycling firm Philip Services Corp collapsed amid accounting irregularities and internal fraud. In 2007, Deloitte & Touche LLP, Philip’s Canadian auditor, settled a US investors' class action lawsuit by paying US$50.5 million.

Serco Geografix Ltd.

On 4 July 2019, the Financial Reporting Council imposed a £4.2 million fine plus £300,000 in investigation expenses on Deloitte for inadequate auditing of Serco Group’s subsidiary, Serco Geografix, during 2011 and 2012. Additionally, audit partner Helen George received a £97,500 penalty for violations of professional competence and due care standards.

SIG plc

Deloitte’s UK affiliate was fined £0.9 million (approximately US$1.1 million) by the Financial Reporting Council in December 2022 for insufficient audit evidence concerning rebate conditions and debtor balances during the 2015/16 audit of the British division of Swiss construction materials company SIG plc.

Standard Chartered

In August 2012, Deloitte Financial Advisory Services (DFAS) refuted accusations that, while serving as internal auditors for Standard Chartered, it deliberately withheld critical information to aid the bank in concealing Iran-related money laundering activities. DFAS agreed to a $10 million settlement with New York state, accepted a one-year prohibition from certain New York banking institutions, and committed to reforms aimed at preventing recurrence. The state regulator found no proof that DFAS intentionally facilitated money laundering.

Steinhoff International

In June 2018, Dutch investor group VEB launched class action litigation against Deloitte’s Dutch affiliate on behalf of shareholders who suffered losses due to fraudulent practices at Steinhoff International. VEB claimed Deloitte bore responsibility for audit failures.

By October 2020, VEB withdrew the lawsuit after Deloitte’s Dutch and South African branches consented to contribute €70 million toward a settlement offered by Steinhoff resolving all associated claims. VEB clarified that the settlement did not constitute an admission of guilt by Deloitte.

Tingo

Deloitte Israel (Brightman Almagor Zohar & Co.) issued an unqualified audit opinion on Tingo Group, Inc.’s 2022 financial statements. This decision sparked controversy following Hindenburg Research’s report highlighting "obvious errors" in Tingo’s accounts, suggesting Deloitte Israel overlooked significant issues. Subsequently, the U.S. Securities and Exchange Commission charged Tingo Group with extensive fraud.

Tongaat Hulett

In January 2022, South African sugar producer Tongaat Hulett announced intentions to sue Deloitte for failing to identify financial discrepancies from 2011 through 2018 that inflated the company’s equity by R12 billion.

By February 2023, Tongaat and Deloitte reached a settlement whereby Deloitte agreed to pay R260 million related to six years of audited financial statements without admitting any liability.

Bandar Malaysia Sdn Bhd

In 2019, Malaysia’s Securities Commission imposed a RM2.2 million (~$0.5 million) penalty on Deloitte’s Malaysian branch due to its involvement in the RM2.4 billion ($0.6 billion) Islamic Finance Sukuk Murabahah Programme.

Canadian Bar Association

In 2003, Deloitte provided data to the Canadian Bar Association indicating a decrease in inflation-adjusted motor vehicle accident claims since 1999, challenging industry demands to limit soft-tissue injury awards to $4,000. Shortly thereafter, confidential information was leaked by a Deloitte member to the Insurance Bureau of Canada without the CBA’s consent. As a result, the Institute of Chartered Accountants of Alberta sanctioned Deloitte with a $40,000 fine for unprofessional behavior.

Eskom

In October 2019, South African power company Eskom initiated legal action against Deloitte’s South African affiliate, Deloitte Consulting, seeking recovery of R207 million paid under two consulting contracts awarded improperly in 2016. Eskom chairperson Jabu Mabuza stated in court documents that Deloitte’s bids—R88.8 million and R79.1 million—were substantially higher than rival offers of R14.6 million and R13.3 million, and R16 million and R9.1 million, respectively.

Thiru Pillay, managing director of Deloitte Consulting Africa, denied any wrongdoing or involvement in corrupt procurement practices, asserting that Eskom was pressuring Deloitte for a settlement.

On 21 March 2020, the parties reached an out-of-court agreement whereby Deloitte consented to refund R150 million of the claimed R207 million. Both sides recognized no proof of corruption but identified "technical irregularities" in the procurement process.

In April 2020, Deloitte announced the departure of two directors linked to the Eskom contracts—Pillay and lead consultant Shamal Sivasanker—with resignations effective 31 March 2020.

Following the end of its contract with Grant Thornton in November 2021, Eskom appointed Deloitte as its external auditor.

Netherlands regulator fine

In 2016, Deloitte Accountants B.V., Deloitte’s Dutch affiliate, was fined €1.81 million (~$2 million) by the Netherlands Authority for the Financial Markets (AFM) for failing to uphold its duty of care during audit inspections.

Quality control failures in Canada

The US Public Company Accounting Oversight Board (PCAOB) imposed a $350,000 civil penalty on Deloitte Canada in 2021 due to deficiencies in its quality control systems.

Rhode Island Benefits system

Deloitte’s US consulting division agreed to a $50 million settlement in 2020 with Rhode Island and the US Federal Government concerning problems arising from the design of a state benefits computer system.

US companies in China

On 29 September 2022, the Securities and Exchange Commission revealed that Shanghai-based Deloitte Touche Tohmatsu Certified Public Accountants LLP (Deloitte-China) consented to pay $20 million to resolve allegations related to audit compliance failures involving American firms operating in China as well as Chinese firms listed in the US. Deloitte-China voluntarily disclosed issues found in audits from twelve fiscal year 2018 engagements, including cases where auditors requested clients to prepare their own audit documentation, resulting in misleading compliance records. Additionally, Deloitte’s US office delegated audit tasks for nine clients with China operations to Deloitte China.

US unemployment portals

Deloitte Consulting was instrumental in creating unemployment insurance websites for multiple US states, including Ohio, Colorado, and Illinois. In May 2020, these platforms were found to contain major security vulnerabilities, prompting proposed class-action lawsuits against Deloitte. Comparable problems were identified with Florida’s CONNECT portal, also developed by Deloitte, which faced criticism as a "massive failure" due to excessive costs, delays, and poor functionality. An investigation ordered by Florida Governor Ron DeSantis revealed that Deloitte’s stress testing procedures were inadequate.

Computer hack

In September 2017, The Guardian revealed a cyber breach at Deloitte that exposed sensitive client and employee information such as usernames, passwords, IP addresses, and business architecture diagrams. These data were stored on Microsoft’s Azure cloud platform without the protection of two-factor authentication. The intrusion likely began in October 2016 and compromised all Deloitte email and administrative accounts. Deloitte reported only a limited number of clients were affected and emphasized that no disruption occurred to their services or client operations. Suspicious activity was initially detected in April 2017; a thorough review of the compromised emails found no evidence of sensitive data leakage.

By October 2017, the hacked client accounts reportedly included several US government departments—Defense, Homeland Security, State, Energy—as well as mortgage agencies Fannie Mae and Freddie Mac, NIH, and the US Postal Service. Both Fannie Mae and Freddie Mac denied any breach of their data. Deloitte quickly informed relevant authorities and impacted clients while implementing enhanced security measures based on expert recommendations. The New York attorney general’s office launched an inquiry into the incident.

Sponsorships

Since 2009, Deloitte LLP has served as the official professional services partner of the United States Olympic Committee. The UK member firm supported the 2012 Summer Olympics and the Royal Opera House. In Canada, Deloitte was the designated professional services provider for the 2010 Vancouver Winter Olympic Games and 2010 Winter Paralympic Games. Deloitte Singapore acted as a sponsor for the 2010 Summer Youth Olympics, while the Australian member firm was a Founding Partner of Invictus Games Sydney 2018; notably, a Principal from Deloitte Consulting held the CEO position for the organizing nonprofit.

Deloitte also backs university sports teams such as Edinburgh University Hockey Club and maintained a three-year partnership with the Cambridge Union Society starting in 2013. In motorsports, Deloitte is the title sponsor of the No. 37 TOM'S Toyota Supra squad (TGR Team Deloitte TOM'S) competing in the 2023 Super GT series.

In May 2017, Deloitte formed a partnership with McLaren Applied Technologies (MAT), combining consulting expertise with MAT’s engineering, sensor technology, simulation, and analytics capabilities. This followed MAT’s earlier collaboration with KPMG that ended in 2017. The alliance expanded in June 2020 to include McLaren Racing, aiming to improve team and vehicle performance. In May 2023, Deloitte and McLaren Racing agreed on a multi-year extension of their partnership.

In May 2022, Deloitte secured a sponsorship agreement exceeding USD300,000 over three years with the Football Association of Singapore, becoming the inaugural title sponsor of the Singapore Women’s Premier League, rebranded as the Deloitte Women's Premier League.

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