Summit Partners is a Boston, Massachusetts -based private equity investment firm that invests in a broad range of companies headquartered in North America and Europe. The firm provides growth equity, venture capital and credit investments for growth, recapitalizations and management buyouts.
The company was founded in 1984, and in addition to its Boston headquarters, has offices in Menlo Park, California ; and London, England. The firm employs more than 85 investment professionals and more than 150 employees overall.
Since inception, Summit Partners has raised more than $20 billion in capital through 18 equity and fixed income funds.
Summit Partners was founded in 1984 by Stephen Woodsum and E. Roe Stamps, who had worked together at TA Associates and before that at First Chicago Investment Corporation (the predecessor of Madison Dearborn Partners). Woodsum and Stamps were joined shortly thereafter by Greg Avis, who would open the firm's California office in 1993. In 2001, Summit Partners completed its management succession led by Bruce Evans, Walter Kortschak, Marty Mannion, Tom Roberts, and Joseph Trustey.
On July 29, 2015, Trustey (then Managing Director and Chief Operating Officer for the firm) was killed in a Milwaukee plane crash along with his daughter Anna. 
Summit Partners has invested in more than 400 companies globally. Summit's portfolio includes a broad range of companies headquartered in North America and Europe. The firm focuses on investments in the technology, healthcare and life sciences, and growth products and services sectors.
Some of Summit's most notable investments include:
- Technology : Answers.com, AVAST, Finisar, Hittite Microwave,  E-TEK Dynamics,  McAfee,  Jamba AG,  WebEx, Wildfire Interactive
- Healthcare & life sciences : HealthCare Partners, Lincare,  MDVIP,  Pediatrix,  Physicians Formula 
- Growth products & services : FleetCor Technologies,  Keystone RV,  optionsXpress,  Ogone,  Snap Fitness,  Tiny Prints,  Vente-privee.com,  Web Reservations International,  Westwing Home & Living GmbH 
Since its founding in 1984, Summit Partners has raised 18 equity and fixed income funds:
|Fund|| Inception |
|Summit Ventures II||1988||$230|
|Summit Ventures III||1992||$280|
|Summit Subordinated Debt Fund||1994||$140|
|Summit Ventures IV||1995||$610|
|Summit Subordinated Debt Fund II||1997||$335|
|Summit Ventures V||1998||$1.12 bill|
|Summit Accelerator Fund||1999||$170|
|Summit Ventures VI||2001||$2.08 bill|
|Summit Subordinated Debt Fund III ||2004||$465|
|Summit Partners Private Equity Fund VII ||2005||$3.10 bill|
|Summit Partners Venture Capital Fund II||2005||$310|
|Summit Partners Europe Private Equity Fund ||2008||€1.05 bill|
|Summit Partners Subordinated Debt Fund IV ($840 million) ||2008||$840|
|Summit Partners Growth Equity Fund VIII||2012||$2.7 bill|
|Summit Partners Venture Capital Fund III||2012||$550|
|Summit Partners Credit Fund||2012||$520|
|Summit Partners Credit Fund II||2014||$1.05 bill|