Knight Capital Group
An American electronic market maker and financial-services firm that became one of the largest traders in U.S. equities before a 2012 software malfunction caused a catastrophic trading loss and led to its acquisition by Getco.
Last updated August 22, 2026
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Overview
Knight Capital Group was an American financial-services company focused on market making, electronic trade execution, institutional sales and trading, and related capital-markets activities. Established in 1995, the company developed from Knight Trading Group and was also known during an earlier period as Knight/Trimark Group. Its core business was to provide liquidity in securities markets by continuously quoting buy and sell prices and routing or executing orders for institutional and other market participants. Knight became particularly prominent through technology-driven trading. Its Electronic Trading Group operated automated systems covering more than 19,000 U.S. securities and handled very large daily volumes. The company made markets in U.S. equities, U.S. options, and European equities, while other operations addressed fixed income, currencies and commodities, institutional sales and trading, execution and clearing, and foreign-exchange trading. The business maintained offices in the United States and in several international financial centers, including London, Hong Kong, Germany, Switzerland, and Singapore. Knight also operated an asset-management business through Deephaven Capital Management, but that activity was largely wound down in 2009 after most of Deephaven's assets were sold to Stark & Roth. At its height, Knight was among the most significant participants in U.S. equity trading. The reference material describes it as the largest trader in U.S. equities, with reported market shares of 17.3 percent on the New York Stock Exchange and 16.9 percent on Nasdaq. In 2011, the company was valued at approximately $1.5 billion and employed about 1,450 people. Its scale reflected the growing importance of automated execution and high-frequency market making in U.S. securities markets, but it also made the firm highly dependent on software controls, deployment procedures, and real-time risk management. Knight's defining corporate crisis occurred on August 1, 2012. During the deployment of code supporting the Retail Liquidity Program, a technician failed to copy the new code to one of eight servers running the firm's SMARS order-routing system. That server retained obsolete Power Peg code. Because a previously used software flag had been reassigned, incoming orders activated the old function, which repeatedly generated orders instead of recognizing that the relevant execution had been completed. Over roughly 45 minutes, the malfunction produced millions of child orders and approximately four million executions involving more than 397 million shares across 154 stocks. The activity disrupted prices in 148 New York Stock Exchange-listed companies. Knight reported a pre-tax loss of approximately $440 million, while some contemporary accounts described the overall trading loss as about $460 million. The company's share price fell sharply, and the incident threatened its ability to continue operating independently. On August 5, 2012, a group of investors led by Jefferies provided roughly $400 million in convertible financing. Jefferies invested $125 million and became Knight's largest shareholder. The rescue financing stabilized the business but did not preserve Knight as a standalone company. In December 2012, Knight agreed to be acquired by Getco LLC. The transaction closed in July 2013, creating KCG Holdings and ending Knight Capital Group's independent corporate existence.
History
Knight Capital Group emerged in the mid-1990s as a specialist in electronic securities trading and market making. It operated under the names Knight Trading Group, Inc. and, during an earlier phase, Knight/Trimark Group. From its headquarters in Jersey City, New Jersey, the firm built a distributed operating network with offices in other U.S. locations and international financial centers. Its business model was based on using automated systems and trading expertise to provide liquidity, execute orders, and serve institutional market participants. The company's principal franchise was market making in U.S. equities. Knight quoted prices and traded across a broad universe of securities, while its Electronic Trading Group provided automated routing and execution. By 2012, the group reportedly covered more than 19,000 U.S. securities and processed average daily volume exceeding $21 billion in May of that year. Knight also made markets in U.S. options and European equities. Additional operating segments included fixed income, currencies and commodities, corporate activities, and institutional sales and trading. Subsidiaries included Knight Capital Americas, Knight Execution & Clearing Services, Knight Capital Europe, and Hotspot FX Holdings. Knight's development reflected the wider transformation of securities markets from floor-based trading toward electronic and algorithmic execution. Its systems allowed the firm to participate at high speed and scale, and by the late 2000s it had become one of the most important traders in U.S. equities. The company reported an average of 3.97 billion shares traded per day in 2008. In 2011, it was described as employing approximately 1,450 people and having a value of about $1.5 billion. Alongside its trading businesses, Knight had an asset-management operation through Deephaven Capital Management. That segment was discontinued in 2009 after Deephaven sold most of its assets to Stark & Roth. The firm also faced regulatory and conduct-related issues before its final crisis. In 2002, Knight paid $1.5 million to resolve allegations involving violations including failure to respect posted quotations, without admitting or denying the allegations. In 2004, it paid $79 million to settle claims that customers had been overcharged. The company was also associated in reporting with allegations concerning spoofing, a form of disruptive algorithmic trading intended to create a misleading impression of market interest. These matters illustrated the regulatory sensitivity of Knight's business, where automated systems operated at substantial speed and scale. The decisive event took place on August 1, 2012. Knight deployed software related to the Retail Liquidity Program across its SMARS automated order-routing infrastructure. One of eight servers did not receive the new code and retained an obsolete Power Peg function. A reused software flag activated that legacy function, and a defect in the completion-reporting logic caused the server to continue sending orders. The resulting activity lasted about 45 minutes and produced approximately four million executions involving more than 397 million shares across 154 stocks. Prices in 148 NYSE-listed companies were disrupted, and individual securities experienced extreme temporary movements. Knight's pre-tax loss was approximately $440 million, with some accounts referring to the loss as $460 million. Its share price collapsed, losing more than 70 percent from its pre-incident level in the immediate aftermath. The firm obtained approximately $400 million in emergency convertible financing on August 5 from investors led by Jefferies. Jefferies contributed $125 million and became Knight's largest shareholder. Although the financing prevented an immediate failure, Knight could not remain independent. In December 2012 it agreed to be acquired by Getco LLC. The transaction closed in July 2013, forming KCG Holdings and bringing Knight Capital Group's corporate history to an end.
- 2013
Merger with Getco is completed
[1]The combination with Getco forms KCG Holdings and ends Knight Capital Group's independent existence.
- 2012
SMARS software malfunction
[1]A faulty deployment causes uncontrolled automated trading, market disruption, and an approximately $440 million pre-tax loss.
- 2012
Emergency financing
[1]Jefferies and other investors provide approximately $400 million in convertible financing.
- 2009
Asset-management operations discontinued
[1]Knight ends its asset-management segment after Deephaven sells most of its assets to Stark & Roth.
- 2008
Large-scale equity trading activity
[1]Knight reports average daily trading of approximately 3.97 billion shares.
- 2004
Customer overcharge settlement
[1]Knight pays a reported $79 million settlement to customers who were allegedly overcharged.
- 2002
Regulatory settlement over quotation practices
[1]Knight pays $1.5 million to settle regulatory allegations involving practices including failure to respect posted quotations.
- 1995
Knight Trading Group is established
[1]Knight begins building a financial-services business centered on electronic trading and market making.
Products and positioning
Technology-driven market maker and electronic execution specialist serving institutional and wholesale financial-market participants.
Market making
U.S. equity market making
Knight's central business was providing continuous buy and sell quotations in U.S. equities. Its automated systems operated across a very large universe of listed securities and supplied liquidity to other market participants. The business generated revenue from executing and facilitating trades while assuming the operational and market risks associated with high-volume electronic dealing.
Electronic execution
Electronic Trading Group
The Electronic Trading Group handled automated order routing and execution for a broad range of U.S. securities. In May 2012, it reportedly covered more than 19,000 securities and processed average daily volume above $21 billion. Its technology was also the organizational context for the SMARS deployment failure that caused the 2012 trading disruption.
Securities trading
U.S. options and European equities trading
Beyond its primary U.S. equity franchise, Knight made markets in U.S. options and European equities. These activities extended the company's electronic market-making and execution capabilities across additional instruments and geographic markets.
Capital markets
Fixed income, currencies and commodities
Knight operated additional business segments involving fixed income, currencies, and commodities. These activities complemented the firm's equity operations and formed part of its broader financial-services and institutional-trading platform.
Asset management
Asset management through Deephaven
Knight formerly operated an asset-management segment through Deephaven Capital Management, including offices in Minnetonka, Minnesota, Hong Kong, and London. The segment was discontinued in 2009 after most of Deephaven's assets were sold to Stark & Roth.
Controversies
2012
Automated trading error and market disruption
A server left with obsolete code activated a defective legacy function after a software deployment. The malfunction generated millions of unintended orders, disrupted prices in many stocks, and caused Knight an approximately $440 million pre-tax loss.
2004
Customer overcharge settlement
Knight paid a reported $79 million settlement to customers who had been overcharged.
2002
Quotation-practice regulatory allegations
Knight paid $1.5 million to settle regulatory charges involving alleged violations including failure to respect posted quotations. The company neither admitted nor denied the allegations.
Brand decisions
2012
Emergency convertible financingOtherBackground
The August software malfunction created an approximately $440 million pre-tax loss and threatened Knight's ability to continue operating independently.
Action taken
Knight raised approximately $400 million from a group of investors led by Jefferies. The financing used convertible securities, and Jefferies invested $125 million.
Aftermath
Jefferies became Knight's largest shareholder, but the financing did not prevent the company from being acquired later in the year.
Emergency convertible financing. $400 million raised (August 2012)
2012
Agreement to combine with GetcoM&ABackground
The trading error, loss of market confidence, and emergency financing left Knight unable to continue as a viable independent public company.
Action taken
Knight agreed to be acquired by Getco LLC in December 2012.
Aftermath
The merger closed in July 2013 and created KCG Holdings.
2009
Exit from asset managementStrategyBackground
Knight's asset-management activities were conducted through Deephaven Capital Management.
Action taken
The company discontinued the asset-management segment after Deephaven sold most of its assets to Stark & Roth.
Aftermath
Knight concentrated more heavily on market making, electronic execution, and other capital-markets activities.
Recent events
Ready Capital completes acquisition of Knight Capital[2]
Reported:
Ready Capital announced that it acquired all outstanding membership interests of Knight Capital in exchange for cash and 658,771 shares of Ready Capital common stock.
Sources2 sources
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