|Type||Subsidiary of Priceline.com|
|Headquarters||Norwalk, CT, USA|
|Founder(s)||Steve Hafner, Paul M. English|
|Key people||Steve Hafner
(Co-founder) & (CEO)
Paul M. English (technologist)
(Co-founder) & (CTO)
|Revenue||$224.5 million (2011)|
|Subsidiaries||SideStep, Swoodoo, Checkfelix.com|
|Available in||English (US, UK, India), Danish, Finnish, French, German, Italian, Norwegian, Spanish & Swedish|
|Launched||2004-05-05 (Alpha) 
October 2004 (Public Beta) 
February 7, 2005 (2005-02-07) 
Kayak.com is a travel metasearch engine operated by the Kayak Software Corporation (or KAYAK). The company also provides related services and operates KAYAK.co.uk, checkfelix.com, and swoodoo.com. The company was acquired by Priceline.com on November 8, 2012.
||This section is in a list format that may be better presented using prose. (January 2014)|
In December 2007, KAYAK raised $196 million in a new round of financing from a group of investors, including General Catalyst Partners, Sequoia Capital, Accel Partners, and Oak Investment Partners. Using that funding, KAYAK acquired SideStep, a competing US travel website.
On March 5, 2010, KAYAK sold certain assets related to the website www.travelpost.com and its travel information business to The New Travelco, Inc., a Delaware corporation, which subsequently changed its name to Travelpost, Inc.
In May 2010, the swoodoo brand, a leading travel search platform in Germany, was acquired.
In January 2011, KAYAK closed down SideStep and redirected SideStep traffic to KAYAK.com.
In April 2011, KAYAK acquired all of the outstanding shares of JaBo Vertrieb-und Entwicklung GmbH, or JaBo Software. JaBo Software operates checkfelix.com, a leading travel metasearch website in Austria.
In July 2012 the company announced it would expand into Russia.
On July 20, 2012 Kayak officially went public, trading under the name KYAK. On its first day of trading, Kayak opened up at $26/ - higher than originally expected and closed at $33.18/share.
On September 25, 2013 it was announced that the State of Connecticut would assist KAYAK with a $2.5 million loan to help facilitate their move to the Harbor Point district of Stamford. 
KAYAK was founded in 2004 by Steve Hafner and Paul M. English. Hafner currently serves as KAYAK’s chief executive officer, and English, the chief technology officer. Before KAYAK, Hafner helped found Orbitz in November 1999 and led its business development, advertising sales, marketing, and product marketing activities.
At The Webby Awards, KAYAK received the People’s Voice award in the travel website category in 2008, the Webby Award in the travel website category in 2009, the People’s Voice award in the mobile travel app category in 2011, and three more awards in 2012: both the Webby and People's Choice awards in the travel website category and the People's Voice award in the mobile travel app category.
In December 2011 KAYAK announced that it would not renew a contract to advertise on the TLC reality television show All-American Muslim. The decision followed a campaign by the Florida Family Association, a one-man fundamentalist organization "on the Christian right" that says it's "defending American values." KAYAK chief marketing officer Robert Birge wrote that TLC "was not upfront with us about the nature of the show" which "sucked" in an explanation posted to the KAYAK website entitled "We Handled This Poorly."
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