|Headquarters||London, United Kingdom
Baltimore, United States
|No. of offices||77|
|No. of attorneys||Approximately 4,200|
|Major practice areas||Arbitration, Banking, Competition and Trade, Corporate Crime, Corporate Finance, Employment, Energy, Hospitality and Leisure, Insurance, Intellectual Property, Litigation, Mergers and Acquisitions, Pensions, Private Equity, Real Estate, Tax, Technology|
|Key people||Frank Burch (Global Co-Chairman)
Anthony Angel (Global Co-Chairman)
Sir Nigel Knowles (Joint CEO)
Lee I. Miller (Joint CEO)
|Revenue||US$2.44 billion (2012)|
|Profit per equity partner||US$1.310 million (2012)|
|Date founded||2005 (by merger)|
|Company type||Limited liability partnership|
DLA Piper is an Anglo-American multinational law firm with 4,200 lawyers located in more than 30 countries throughout the Americas, Asia Pacific, Europe and the Middle East. In 2012 it had total revenues of US$2.44 billion and average profit per equity partner of US$1.310 million. It is the largest law firm in the world measured by number of lawyers, and the world's second-largest law firm measured by 2011 revenues (after Baker & McKenzie).
DLA Piper was formed in January 2005 by a merger between three law firms: San Diego-based Gray Cary Ware & Freidenrich LLP, Chicago-based Piper Rudnick LLP and London-based DLA LLP. It is composed of two partnerships, the United Kingdom-based DLA Piper International LLP and the United States-based DLA Piper U.S. LLP. The two partnerships share a single management board but are not financially integrated.
DLA Piper's origins can be traced back to Sir Charles Lupton OBE (1855–1935),   who qualified as a solicitor in 1881 practising mainly at Dibb & Co., later Dibb Lupton in Leeds. Lupton was the Lord Mayor of Leeds  in 1915-16. He is the great great granduncle of Catherine, Duchess of Cambridge.  
2005 to 2010 
In July 2004 London-based law firm DLA LLP and Chicago-based law firm Piper Rudnick announced their intention to merge on 1 January 2005. DLA had been the result of a mid-1990s merger between three UK firms, Dibb Lupton Broomhead, Alsop Stevens, and Wilkinson Kimbers. Piper Rudnick had been the product of a 1999 merger between Baltimore-based Piper & Marbury and Chicago-based Rudnick & Wolfe.
Piper Rudnick agreed to merge with San Diego-based law firm Gray Cary Ware & Freidenrich LLP in October 2004, forming a firm with around 1,300 lawyers and 20 offices across the United States. In December 2004 DLA LLP, Gray Cary and Piper Rudnick, the latter two of which had yet to complete their merger, announced that the partners of each firm had approved a three-way merger. The merger became effective on 1 January 2005 and the new firm was named DLA Piper Rudnick Gray Cary. The merger was structured in the form of two limited liability partnerships, DLA Piper International LLP, and DLA Piper U.S. LLP, which share a single management board but are not financially integrated.
In July 2005 DLA Piper acquired EY Law's 87 lawyer operation in the Commonwealth of Independent States, including offices in Moscow and St Petersburg. In December 2005 DLA Piper opened an office in Beijing, having recruited a team of lawyers from the Beijing office of Coudert Brothers.
In January 2006 DLA Piper opened its first office in the Middle East, in Dubai. Over the following three years the firm opened further offices in the region in Abu Dhabi, Doha, Kuwait City, Muscat and Riyadh. On 1 September 2006 the firm shortened its name to DLA Piper. DLA Piper merged with its Norway-based alliance firm DLA Nordic in the same month, and formed an alliance with the Australia-based law firm Phillips Fox in November 2006, with Phillips Fox rebranding as DLA Phillips Fox.
2010 to present 
In January 2011 DLA Piper and DLA Phillips Fox announced their intention to merge. The merger was approved by partners of both firms in February and was completed on 1 May, when DLA Phillips Fox become part of DLA Piper International LLP. Later in the same month DLA Phillips Fox's fomer New Zealand-based offices separated to form an independent firm, which continues under the DLA Phillips Fox name. DLA Piper formed an alliance with Venezuela-based law firm InterJuris Abogados in February 2011, which subsequently renamed as DLA Interjuris.
On March 25, 2013, the New York Times reported that a client of DLA Piper named Adam H. Victor complained about allegedly excessive legal fees being charged by the firm. The Times published emails from DLA Piper, including one from an associate that allegedly referenced "random" work being performed for "random" research projects, implying that the work was not necessary. DLA Piper denied any wrongdoing, claiming that the emails were an “offensive and inexcusable effort at humor.” 
Political contributions 
Notable staff 
- "Facts and Figures". DLA Piper. Retrieved 4 May 2011.
- "DLA Piper's Gross Revenue Rises 8.6 Percent to $2.44 billion". The AmLaw Daily. 1 February 2013. Retrieved 2 February 2013.
- "Our History". DLA Piper. Retrieved 30 September 2010.
- Baxter, Bryan. "We're Number One! We're Number One!: Firm Now Ranks as World's Largest". New York Law Journal. Retrieved 3 May 2011.
- "The 2012 Global 100: Most Revenue". The American Lawyer. Retrieved 2 February 2013.
- "Firm Leadership". DLA Piper. Retrieved 30 September 2010.
- UK World War 1 Casualties, Casualties UK W.W .1. [UK Gov. "http://www.123people.co.uk/ext/frm?ti=personensuche%20telefonbuch&search_term=charles%20lupton&search_country=GB&st=suche%20nach%20personen&target_url=aHR0cDovL3d3dy5jd2djLm9yZy9zZWFyY2gvY2FzdWFsdHlfZGV0YWlscy5hc3B4P2Nhc3VhbHR5PTY0NDQz§ion=weblink&wrt_id=226"] Check
|url=scheme (help). Casualties World War 1. Uk gov Ministry Defence - archives. Retrieved March 22,, 2011.
- Ravetz, Alison. [0-85664-160-5 "http://books.google.com.au/books?id=-7oOAAAAQAAJ&pg=PA119&lpg=PA119&dq=sir+charles+lupton+lord+mayor+leeds&source=bl&ots=0aTn_eb9kg&sig=xg2C_ePr1d3N2hfh59xdmgYPrR4&hl=en&sa=X&ei=Ii07UdXlBaayiQeg24DADw&ved=0CFoQ6AEwCA#v=onepage&q=sir%20charles%20lupton%20lord%20mayor%20leeds&f=false"] Check
|url=scheme (help). MODEL ESTATE, Page 119, chapter is titled "The Linguistic Atlas of Scotland", copyright 1974. Croom Helm Ltd LONDON. Retrieved March 9, 2013.
- DLA Piper, DLA Piper. [Inside Info "http://www.rollonfriday.com/InsideInfo/CityFirms/tabid/68/Id/29/Default.aspx"] Check
|url=scheme (help). Roll on friday. City Firms. Retrieved March 9, 2013.
- Leodis, Leeds Public Library. [Leeds UK "http://www.leodis.net/display.aspx?resourceIdentifier=20031021_91329593"] Check
|url=scheme (help). History of Quarry Hill LEEDS. UK Gov. (Leeds). Retrieved March 9, 2013.
- BBC Quarry Hill History, UK Government. [Quarry Hill BBC "http://www.bbc.co.uk/leeds/content/image_galleries/image_gallery_quarry_hill_gallery.shtml"] Check
|url=scheme (help). Quarry Hill BBC. UK Government. Retrieved March 9, 2013.
- Reed, Michael. [UK Guardian "http://www.guardian.co.uk/uk/the-northerner/2013/apr/05/duchess-of-cambridge-kate-middleton-leeds"] Check
|url=scheme (help). UK Guardian, April 5th, 2013. UK Guardian. Retrieved April 12th, 2013.
- Lupton, C.A. , The Lupton Family in Leeds, Wm. Harrison and Son 1965
- "Nigel Knowles tours UK to drum up support for ‘DLA Piper Rudnick’". The Lawyer. 26 July 2004. Retrieved 3 July 2012.
- "The bigger the better? The merger between DLA and Piper Rudnick creates a new global giant". The Economist. 9 December 2004. Retrieved 19 July 2012.
- "Two Law Firms to Join Forces". The New York Times. 19 October 2004. Retrieved 2 July 2012.
- "Piper Rudnick to Merge With Big British Firm". The Washington Post. 6 December 2004. Retrieved 2 July 2012.
- "Piper Rudnick, DLA to combine". Chicago Tribune. 6 December 2004. Retrieved 2 July 2012.
- "DLA Piper secures E&Y CIS takeover approval". The Lawyer. 27 June 2005. Retrieved 3 July 2012.
- "DLA Piper opens in Beijing with Coudert crew". The Lawyer. 9 December 2005. Retrieved 2 July 2012.
- "DLA restructuring to dramatically scale back Gulf presence". The Lawyer. 7 December 2009. Retrieved 2 July 2012.
- "Shorter is sweeter". The Lawyer. 10 July 2006. Retrieved 3 July 2012.
- "DLA Piper loses Bergen office to local firm". The Lawyer. 20 January 2009. Retrieved 19 July 2012.
- "DLA Piper finalises Aussie alliance". The Lawyer. 4 May 2006. Retrieved 2 July 2012.
- "Phillips Fox becomes DLA Phillips Fox". The Lawyer. 15 June 2006. Retrieved 3 July 2012.
- "Phillips Fox Vietnam opts for AAR tie-up". The Lawyer. 6 November 2006. Retrieved 2 July 2012.
- "DLA Piper looks to Bucharest for full CEE coverage". The Lawyer. 17 September 2007. Retrieved 3 July 2012.
- "DLA Piper sets 150-lawyer target for Germany offices". The Lawyer. 20 August 2007. Retrieved 3 July 2012.
- "DLA to launch in Turkey via alliance with local firm". The Lawyer. 23 February 2010. Retrieved 3 July 2012.
- "DLA Piper Joins Law Firms Beckoned by Brazil’s Growth". Bloomberg. 2 March 2010. Retrieved 3 July 2012.
- "Merger of DLA Phillips Fox with DLA Piper to create law giant". The Australian. 28 January 2011. Retrieved 2 July 2012.
- "DLA Piper seals ‘unique’ Aussie merger". The Lawyer. 31 January 2011. Retrieved 2 July 2012.
- "DLA Piper partners give backing to firm's Aussie merger". The Lawyer. 28 February 2011. Retrieved 2 July 2012.
- "DLA Phillips Fox in divorce from New Zealand arm". The Lawyer. 3 May 2011. Retrieved 2 July 2012.
- "DLA Piper launches in Mexico City with Thompson & Knight team". The Lawyer. 14 February 2012. Retrieved 3 July 2012.
- "DLA Piper to shut Glasgow and offload defendant insurance teams as redundancy talks continue". The Lawyer. 24 January 2013. Retrieved 2 February 2013.
- "Hill Dickinson acquires DLA's Sheffield and Manchester insurance hubs". The Lawyer. 28 January 2013. Retrieved 2 February 2013.
- "Our Offices". DLA Piper. Retrieved 25 October 2010.
- Top Contributors to Barack Obama | OpenSecrets
- "DLA Piper: The Firm Behind the Mitchell Report". The Wall Street Journal. 4 December 2007. Retrieved 25 October 2010.
- "Palestinians looking to American-style housing developments, financing". The Washington Post. 23 November 2009. Retrieved 25 October 2010.
- "Tom Daschle". The Washington Post. Retrieved 3 July 2012.
- "Lib Dem first lady Miriam Gonzalez Durantez lands job at US firm". The Independent. 28 October 2011. Retrieved 19 July 2012.
- "The Churn: Lateral Moves and Promotions in The Am Law 200". The AmLaw Daily. 3 May 2011. Retrieved 19 July 2012.