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Oak Investment Partners is a private equity firm focusing on venture capital investments in companies developing communications systems, information technology, new Internet media, healthcare services and retail.

Oak Investment Partners
Private Equity Investment Firm
IndustryPrivate equity
Founded1978; 41 years ago (1978)
HeadquartersGreenwich, Connecticut, United States
ProductsVenture capital



The firm, founded in 1978, is based in Greenwich, Connecticut with offices in Norwalk, Connecticut, Minneapolis and Palo Alto, California. Since inception, Oak had invested in more than 480 companies and had raised more than $8.4 billion in investor commitments across 12 private equity funds.[1]. Ann Lamont is a founder and managing partner.[2]

In May 2006, Oak raised its 12th fund, at $2.56 billion reportedly the largest venture capital fund ever raised.[3]

In 2015, Indian-born employee Iftikar Ahmed was sued by the U.S. Securities and Exchange Commission on suspicion of stealing US$65 million from the firm.[4] Ahmed was believed to have fled to India. In August 2015, Fortune reported that Mr. Ahmed had been detained in an Indian prison from May 22 until July 23 and that his passport had been confiscated.[5]


Oak invests across a range of stages: funding startup companies, funding spinouts of existing divisions and assets, and providing growth capital to later-stage companies. Oak also selectively invests in public companies through PIPE investments.

In December 2008, Oak invested $25 million in the online media outlet Huffington Post.[6]

Other notable Oak investments include eVoice,[citation needed] Brightcom Group,[7] Dick's Sporting Goods,[8] DueDil,[9] Moxie Software,[7] NeoPhotonics Corporation,[10] Office Depot,[8] Petsmart, P.F. Chang's China Bistro, Polycom, nLIGHT, Sandisk, and Seagate, Tikona Infinet Limited.


  1. ^ Mass High Tech: The Journal of New England Technology, July 21, 2006 Oak's $2.5B fund, closed in Q2, is nation's largest
  2. ^ Alison Leigh Cowan (16 October 2006). "Not-So-Hidden Asset, His Wife, Is Force in Lamont's Senate Bid". The New York Times. Retrieved 27 March 2015. Now Ms. Lamont, one of the most successful women ever in the lofty realm of venture capital, is the not-so-hidden hand behind her husband, Ned, the political novice who managed to topple a three-term incumbent in the Democratic primary.
  3. ^ Thomson, July 17, 2006 Mega Funds Drive Private Equity Fundraising To New Heights In Second Quarter Of 2006
  4. ^ Das, Anupreeta; Eaglesham, Jean (7 October 2015). "Harvard, Goldman Sachs, Venture Capital…Fugitive". The Wall Street Journal. Retrieved 10 October 2015.
  5. ^
  6. ^ Huffington Post Nabs $25 Million in Funding–Here’s a BoomTown Interview With Oak Investment’s Fred Harman All Things Digital, December 1, 2008
  7. ^ a b "List of top Oak Investment Partners Portfolio Companies". Crunchbase. Retrieved 20 March 2019.
  8. ^ a b Chakravarty, Chaitali (15 May 2007). "Oak Investment plans $200m retail fund". The Economic Times. Retrieved 20 March 2019.
  9. ^ "Oak Investment Partners - Investments". Crunchbase. Retrieved 20 March 2019.
  10. ^ "Bloomberg - Are you a robot?". Retrieved 20 March 2019.

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