DoubleClick was a brand of Google which developed and provided Internet ad serving services. Its clients included agencies, marketers and publishers who served businesses like Microsoft, General Motors, Coca-Cola, Motorola, L'Oréal, Palm, Apple, Visa, Nike, and Carlsberg among others.
|Subsidiary of Google|
New York City
|Headquarters||New York City|
|– Stephanie Abramson, Executive VP and General Counsel|
– Neal Mohan, Senior VP of Strategy and Product Development
– Stuart Frankel, Senior VP of DoubleClick & GM of Performics
– John M. Rehl, Senior VP, Global Technical Services
|Products||DART family includes DFP (For Publishers), DFA (For Advertisers), DS (DART Search), Motif (Rich Media), DE (Enterprise), Sales Manager (Publisher), Media Visor (Advertisers), Adapt (Publishers), Doubleclick Advertising Exchange (Both Publishers & Advertisers)|
|Parent||Google (Alphabet Inc.)|
DoubleClick was founded in 1995 by Kevin O'Connor and Dwight Merriman and had headquarters in New York City, United States. It was formerly listed as "DCLK" on the Nasdaq Stock Market (NASDAQ), and was initially purchased by private equity firms Hellman & Friedman and JMI Equity in July 2005.
In March 2008, Google acquired DoubleClick for $3.1 billion. In June 2018, Google announced plans to rebrand its ads platforms, and DoubleClick was merged into the new Google Marketing Platform brand.
In 1995, Kevin O'Connor and Dwight Merriman developed the concept for DoubleClick in O'Connor's basement. The pair created a system to display banner ads across a network of websites and track their performance to better target internet users.  The product caught the attention of entrepreneur Kevin Ryan, who later joined as the company's CFO and later became its CEO.
Later that year, O'Connor and Merriman met Fergus O'Daily, the CEO of Poppe Tyson. Poppe Tyson had created an Interactive Sales division, but lacked the technology to deliver online ads across its network of client's sites. O'Connor, Merriman and O'Daily decided to merge the two companies. The merger caused some issues at Poppe Tyson, however, because it meant that Poppe's sales force would compete against the internal sales teams of the websites it served. To remedy the situation, in November 1995 they spun off DoubleClick as an independent, wholly owned subsidiary. DoubleClick was founded as one of the earliest known Application Service Provider (ASP) for internet "ad-serving"—primarily banner ads.
DoubleClick launched an IPO on the NASDAQ under the "DCLK" ticker symbol in early 1998. In June 1999, DoubleClick announced that it would merge with Abacus Direct Corp., which marketed consumer-purchasing data to catalog firms. Soon after, privacy groups complained that DoubleClick's plan to combine its online profiling information with offline information gathered by Abacus Direct would violate privacy rules, as it would allow the company to match a person's identity with their online habits, which it tracks through cookies. In February 2000, The FTC announced it had launched an investigation into the matter. The investigation was concluded in early 2001, with the FTC stating that it found no evidence that DoubleClick used or disclosed consumers personal identifying information. 
In April 2005, Hellman & Friedman, a San Francisco-based private equity firm, announced its intent to acquire the company for $1.1 billion. Following the acquisition, the company was separated into two divisions, an internet ad-management business and a data-solutions business for direct marketers.
Acquisition by Google, Inc.Edit
Google announced on April 13, 2007 that it had come to a definitive agreement to acquire DoubleClick for US $3.1 billion in cash. The deal raised concerns surrounding competition with both the FTC and the European Union. In May 2007, the FTC requested additional information about the deal after it was urged by competitors, including Microsoft, who believed it would give Google too much control over online advertising. On December 20, 2007, the FTC approved Google's purchase of DoubleClick from its owners Hellman & Friedman and JMI Equity, saying, "after carefully reviewing the evidence, we have concluded that Google's proposed acquisition of DoubleClick is unlikely to substantially lessen competition." European Union regulators granted approval on March 11, 2008, and Google completed the acquisition later that day. On April 2, 2008, Google announced it would cut 300 jobs at DoubleClick due to organizational redundancies. Selected employees would be matched within the Google organization as per position and experience.
In 2007, shortly after the announcement of the acquisition, it was reported that DoubleClick had been serving ads designed to trick users into buying malware. This occurred after a malicious website tricked several name-brand websites into serving the ads.
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DoubleClick offers technology products and services that are sold primarily to advertising agencies and media. The company's main product line is formally known as DART, which is intended to increase the purchasing efficiency of advertisers and to minimize unsold inventory for publishers. DART Enterprise is the rebranded version of NetGravity AdServer, which DoubleClick acquired with its purchase of NetGravity in 1999.
In 2004, DoubleClick acquired Performics. Performics offers affiliate marketing, search engine optimization, and search engine marketing solutions. The marketing solutions were integrated into the core DART system and rebranded DART search. DoubleClick Advertising Exchange (released Q2 2007) attempts to go even further by connecting both media buyers and sellers on an advertising exchange much like a traditional stock exchange. In June 2010, Google confirmed its acquisition of Invite Media, a demand-side platform which it later renamed Doubleclick Bid Manager.
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DoubleClick targets along various criteria. Targeting can be accomplished using IP addresses, business rules set by the client or by reference to information about users stored using cookies on their machines. Some of the types of information collected are:
In addition, the cookie information may be used to target ads based on the number of times the user has been exposed to any given message. This is known as "frequency capping".
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