Knight Capital Group
|Traded as||NYSE: KCG, until July 1, 2013|
|Fate||Acquired by Getco LLC in 2013, forming KCG Holdings|
|Headquarters||Jersey City, New Jersey, USA|
|Key people||Thomas Joyce, Chairman and Chief Executive Officer|
|Products||Market making and trading|
|Revenue||$1.404 billion USD (2011)|
|Net income||$115.2 million USD (2011)|
The Knight Capital Group was an American global financial services firm engaging in market making, electronic execution, and institutional sales and trading. With its high-frequency trading algorithms Knight was the largest trader in U.S. equities, with a market share of 17.3% on NYSE and 16.9% on NASDAQ. The company agreed to be acquired by Getco LLC in December 2012 after an August 2012 trading error lost $460 million. The merger was completed in July 2013, forming KCG Holdings.
Knight was formerly known as Knight/Trimark Group, Inc. and Knight Trading Group, Inc. Initially, Knight Trading group had multiple offices located in the United States and in other cities around the world. Knight's Asset Management offices were headquartered in Minnetonka, Minnesota, with offices in Hong Kong, China, and London.
Knight's largest business is market making in U.S. equities. Its Electronic Trading Group (ETG) covers more than 19,000 U.S. securities with an average daily trading volume of more than 21 billion dollars (May 2012). Furthermore, Knight makes markets in U.S. options and European equities.
In 2002, Knight paid $1.5 million to settle regulatory charges of violations such as not respecting posted quotes. Knight neither admitted nor denied the allegations. In 2004, the company paid a $79 million settlement to customers whom they had overcharged. In 2008, Knight traded an average of 3.97 billion shares per day. In 2011, the company was worth $1.5 billion and employed approximately 1450 people.
Knight Capital Group operates in three segments: equities, fixed income, currencies and commodities, and corporate. Current operating business subsidiaries include Knight Capital Americas, L.P., Knight Execution & Clearing Services LLC, Knight Capital Europe Limited and Hotspot FX Holdings, Inc.  Knight Capital Group discontinued operations of its asset management segment in 2009 when its subsidiary, Deephaven Capital Management, sold most of its assets to Stark & Roth, LLC. 
2012 stock trading disruption
On August 1, 2012, Knight Capital accidentally deployed test software code to a production environment. The test code was designed to move stock prices higher and lower in order to verify the behavior of trading algorithms in a controlled environment. When released into production, Knight's trading activities caused a major disruption in the prices of 148 companies listed at the New York Stock Exchange, thus, for example, shares of Wizzard Software Corporation went from $3.50 to $14.76. This caused Knight Capital's stock price to collapse. Knight Capital took a pre-tax loss of $440m sending shares lower by over 70% from before the announcement. The nature of the Knight Capital's unusual trading activity was described as a "technology breakdown". 
On Sunday Aug. 5 the company managed to raise around $400 million from half a dozen investors led by Jefferies in an attempt to stay in business after the trading error. Jefferies CEO, Richard Handler and Executive Committee Chair Brian Friedman structured and led the rescue and Jefferies purchased $125 million of the $400 million investment and became Knight's largest shareholder. . The financing would be in the form of convertible securities, bonds that turn into equity in the company at a fixed price in the future. 
The incident was embarrassing for Knight CEO Thomas Joyce, who was an outspoken critic of Nasdaq's handling of Facebook's IPO. On the same day the company's stock plunged 33 percent, to $3.39; by the next day 75 percent of Knight's equity value had been erased.
- Knight Capital Group SEC Form 10-K Annual Report for the year ended December 31, 2010
- Knight Liquidity Statistics
- "Volume Statistics". Knight.com. 2012-06-14. Retrieved 2012-06-15.
- "$1.5 Million Penalty For Knight Trading". The New York Times (The New York Times Company). 2002-01-08. Retrieved 4 March 2009.
- "Company New; Knight Trading Reaches Settlement with S.E.C.". The New York Times (The New York Times Company). 2004-07-08. Retrieved 4 March 2009.
- "Liquidity". Knight Trading Group. 2008. Archived from the original on 2009-03-03. Retrieved 2009-03-04.
- Dinger, Ed (1999). "Knight Trading Group, Inc.". CBS Interactive (International Directory of Company Histories). Retrieved 4 March 2009.
- [Knight Locations http://www.knight.com/ourFirm/ourLocations.asp]
- Knight Capital Group Online website.
- "Deephaven to Sell Flagship Fund." New York Times, January 27, 2009.
- Caroline Vatetkevitch, Chuck Mikolajczak (August 1, 2012). "Error by Knight Capital rips through stock market". Reuters.
- Maureen Farrell (August 1, 2012). "Knight's bizarre trades rattle markets". CNN.
- Kate Kelly, Kayla Tausche, Knight Close to Deal to Raise $400 Million From Investors, CNBC.com, accessed Aug. 5, 2012
- PALLAVI GOGOI, Glitch causes big swings in dozens of stocks, Associated Press, accessed Aug. 5
- CHRISTINA REXRODE; GOGOI PALLAVI. "Cost of glitch for Knight Capital: $440 million." AP Worldstream. Press Association, Inc. 2012. HighBeam Research. 5 Aug. 2012