One by AOL
Company typeSubsidiary
IndustryMobile advertising & Monetization
DefunctSeptember 10, 2018 (2018-09-10)
Baltimore, Maryland, USA
Area served
Key people
Tim Mahlman (President)
Seth Demsey (CTO)
Number of employees
601 (January 23, 2014)

One by AOL, formerly known as Millennial Media, was an advertising company that places display ads on mobile devices (mobile marketing).


One by AOL was founded as Millennial Media in May 2006 by Paul Palmieri and Chris Brandenburg.[1][2] The company received $64.8M in funding between 2007 and 2011 from venture capitalists,[3][4][5] and went on to acquire several companies, including TapMetrics in 2010,[6] Condaptive in 2011,[7] Jumptap in 2013,[8] and Nexage in 2014.

In January 2012, Millennial Media filed with the SEC for an initial public offering of its common stock,[9] and the company was first listed in March 2012.[9]

On January 27, 2014, Palmieri stepped down from his position and was replaced by Michael Barrett.[10]

On September 3, 2015, AOL agreed to buy Millennial Media for US$238 million.[11] On October 23, 2015, AOL completed the acquisition, and changed the name to ONE by AOL. [12]

On September 10, 2018, AOL's parent company Oath 'combined' BrightRoll, One by AOL and Yahoo Gemini into a single advertising proposition dubbed Oath Ad Platforms.[13]


  1. ^ Edit Staff. "Mobile Ad Firm Millennial Media Gets $16 Million Funding".
  2. ^ "CTO Chris Brandenburg to leave Millennial Media post-Metaresolver acquisition". 20 May 2013.
  3. ^ "PE HUB » Millennial Media Raises Series A". PE HUB. 19 May 2023.[permanent dead link]
  4. ^ "Millennial Media scores $15 million in Series B". FierceMobileIT. Archived from the original on 2011-01-07.
  5. ^ "Mobile Ad Network Millennial Media Raises $27.5 Million to Fight Apple and Google". AllThingsD.
  6. ^ "Mobile ad network Millennial Media acquires analytics firm TapMetrics - VentureBeat - Deals - by Devindra Hardawar". 23 February 2010.
  7. ^ Leena Rao (25 May 2011). "Millennial Media Acquires Mobile Data Startup Condaptive". TechCrunch. AOL.
  8. ^ "Millennial Media Signs Definitive Agreement to Acquire Jumptap" (Press Release). The Wall Street Journal. August 13, 2013.
  9. ^ a b Leena Rao (28 March 2012). "Mobile Ad Network Millennial Media Prices IPO At $13 Per Share". TechCrunch. AOL.
  10. ^ "Michael Barrett Is New CEO At Millennial Media, Palmieri Leaves". AdExchanger. 27 January 2014.
  11. ^ "AOL Confirms It Is Buying Millennial Media In $238M Deal To Expand In Mobile Ads". TechCrunch. 3 September 2015.
  12. ^ "AOL Completes Acquisition of Millennial Media". Nasdaq.
  13. ^ Rowntree, Lindsay (September 10, 2018). "Oath Unifies Its Ad Tech Products Under One Brand". ExchangeWire. Retrieved 26 July 2023.