One surname, many partnerships.

Deloitte is named after an accountant. In 1845, Wikipedia says, William Welch Deloitte opened an office in Basinghall Street in the City of London. The practice moved to No. 4 Lothbury in 1855 and stayed there until 1905. In 1890 it opened a branch on Wall Street in New York, run by Edward Adams and P. D. Griffiths, and other branches followed in Chicago and Buenos Aires.

The firm that carries the name today was assembled from several partnerships, each named after its founders. In 1896 Charles Waldo Haskins and Elijah Watt Sells formed Haskins & Sells in New York. In 1898 George Touche set up an office in London, and in 1900 he joined John Ballantine Niven to found Touche Niven in New York. Through further mergers that firm became Touche, Ross, Bailey & Smart in 1960 and simply Touche Ross in 1969. In Japan, Nobuzo Tohmatsu formed Tohmatsu Aoki & Co in 1968, and it joined the Touche Ross network in 1975.

The London firm, by then called Deloitte, Plender, Griffiths & Co., merged with Haskins & Sells in 1952 to form Deloitte Haskins & Sells. In 1989 Deloitte Haskins & Sells merged with Touche Ross in the United States to form Deloitte & Touche, led jointly by J. Michael Cook and Edward A. Kangas. Not every member firm went along. The UK partnership of Deloitte Haskins & Sells merged instead with Coopers & Lybrand, a firm that later became part of PwC, and some Touche Ross firms joined other groups.

That split left the merged group with a naming problem. Wikipedia says there was no worldwide exclusive access to the names Deloitte or Touche Ross, because key member firms had stayed out, so the international firm was called DRT International, after Deloitte, Ross and Tohmatsu. In 1993 it was renamed Deloitte Touche Tohmatsu, the name its coordinating company still carries. Deloitte Touche Tohmatsu Limited is a private company limited by guarantee incorporated in England and Wales, and the firms that trade as Deloitte around the world are its members.

From Deloitte & Touche to Deloitte.

The single word came in 2003. In October that year Accountancy Age reported that Deloitte & Touche would now be known simply as Deloitte, following what the paper called the trend of single-name branding. The firm timed the announcement to coincide with its global results. William Parrett, its global chief executive, told the paper that the new name reflected the wider range of services the firm could offer as a multidisciplinary practice. The same report recalled an earlier naming episode: the year before, the firm had tried to rename its consulting arm Braxton, then reversed the decision, and the unit kept the name Deloitte Consulting.

That consulting story is the background to the logo. Deloitte had announced plans in February 2002 to spin off its consulting business and reversed course in March 2003, as a New York Times report quoted by Going Concern in March 2025 recounts. Deloitte’s own account, on a company page titled “Becoming the Green Dot”, says the firm rebranded in 2003 after its plan to sell its management consulting business fell through, and that it wanted a new identity to bring the pieces back together after Deloitte Consulting had operated more or less independently since 1995.

Deloitte says many competitors were turning to acronyms or shortened names at the time. It went the other way and kept the founder’s surname whole. Suzanne Gylfe, a brand and marketing managing director at Deloitte LLP, is quoted on the page as saying the real equity was in the root of “Deloitte”. The new logo would be a wordmark, the company says, but it needed something more, and its advertising firm proposed moving the dot over the “i” to the end of the word.

The colour took longer. According to Deloitte, the original design put a fuchsia dot after a blue “Deloitte”, and the team then tried yellow, orange and a “light bronze” before settling on green, the colour it says worked. The company also says some people initially thought the dot too unusual, even a bit silly, and were reluctant to hand out business cards carrying it. In June 2016, Wikipedia records, Deloitte changed its branding again and adopted a new logo with the name set in black instead of the earlier blue.

Professional-services names and their marks.

Professional-services identities tend to be built from a short list of raw materials. The earliest is the partner’s surname: many advisory and accounting firms began as the name of one or two founders on a brass plate, and that surname often survives long after the founders have left, because clients and regulators already know it. When firms combine, the name usually grows by addition, with surnames joined by ampersands, and then shrinks again as the string becomes unwieldy. Initialisms are the common end point, turning a row of names into two, three or four letters that fit a business card, a building sign and a browser tab.

Mergers and separations also force renames. A firm that splits from a former parent, or that must stop using a name it no longer owns, sometimes coins a new word instead of reusing a surname, and that coined word then has to earn meaning through use. The visual side is usually restrained: a wordmark set in a sober serif or sans, one corporate colour used consistently, and a small graphic accent such as a dot, a bar or a typographic mark that stands in for a symbol. Redesigns in this field often adjust spacing, weight and colour rather than replacing the name, so continuity is part of the message.

A network under one name.

Deloitte is a network rather than a single company. Each national practice is a separate firm, and the firms that use the name do so as members of Deloitte Touche Tohmatsu Limited, which coordinates the network from London. Citing the company website, Wikipedia says Deloitte refers to the brand under which independent firms around the world work together on audit, consulting, financial advisory, risk management and tax services. That structure is why the same wordmark can sit above very different local histories.

India shows how far that goes. Wikipedia says Deloitte operates there under several brand names, among them A.F. Ferguson & Co., S.B. Billimoria, Fraser & Ross and Deloitte Haskins & Sells, and that it carries out audits in India through C.C. Chokshi & Co., an existing firm it reached an agreement with in 1998, because Indian rules do not allow foreign firms to carry out audits there.

The name has kept absorbing other businesses. In 2002, Wikipedia says, Arthur Andersen’s UK practice agreed to merge with Deloitte’s UK firm, along with Andersen practices in Spain, the Netherlands, Portugal, Belgium, Mexico, Brazil and Canada. In January 2013 Deloitte bought substantially all of the business of Monitor Group, the strategy firm founded by the Harvard Business School professor Michael Porter, after Monitor filed for bankruptcy protection. Its digital arm, Deloitte Digital, traces back to Eclipse, an internet design firm Deloitte acquired in 2000, and in 2016 it added the San Francisco advertising agency Heat. Each was brought under the Deloitte name.

Read as a whole, the story is about a surname that outlasted the partner names attached to it. Haskins, Sells, Touche, Ross and Tohmatsu have dropped out of the everyday brand; Deloitte stayed, and in 2003 the firm chose to end it with a dot, in green.

For a design guide, Deloitte shows how one small device can carry an identity built on a plain wordmark. Compare PwC, whose long merged name was cut down to initials in 2010, and EY, which shortened Ernst & Young in 2013. For this guide we use green, deep green and ink with a sans, an unofficial interpretation; no product or logo is reproduced.

Keep Deloitte’s identity on hand — save it to a board in the Made Good inspiration library.