Technology private equity since 2011
Operational Intensity.Middle-Market Focus.Deep Technology Expertise.
Siris is a private equity firm that makes investments in technology and technology-enabled services companies.
Investment dates as listed for each portfolio company. Select a year for details.
- 2011Year founded
- $6.2BCommitted capital across four institutional funds
- ~20Platform investments*
- ~40Add-on acquisitions*
* Includes investments made by October Capital, LLC, an affiliate of Siris.
What defines us
Three principles behind every investment
- 01
Operational intensity
Our Operating Partners are exceptional operating executives who work with Siris to identify, validate and deliver on the strategic objectives of each investment.
- 02
Middle-market focus
We invest in middle-market technology and technology-enabled services companies in North America and Europe, partnering with motivated management teams.
- 03
Deep technology expertise
Our insight is backed by decades of private equity and technology experience. We have lived through numerous tech disruptions and transformations.
How we work
Operating Partners, integrated across the investment lifecycle
Fundamental to Siris’ investment strategy is our team of Operating Partners. Because of their leadership experience, they work in close partnership with management teams to help deliver on each portfolio company’s potential.
- 01
Identify
We focus on mature technology companies with mission-critical products and services that are facing industry changes or other significant transitions.
- 02
Validate
Operating Partners help validate the strategic objectives of each investment, drawing on their experience leading technology businesses.
- 03
Deliver
They work in close partnership with management teams to deliver on each company’s potential, supported by the Siris network.
- 04
Realize
Our investment team and Operating Partners help build companies, add value and sell them to strategic buyers.
Operating Partners, while not employees of Siris, work with us to identify, validate and operate investment opportunities.
In their words

Siris is an experienced technology investment firm, and we look forward to fully leveraging the team’s deep industry and operational expertise to help propel the many exciting growth opportunities in front of us.
Shane BuckleyChief Executive Officer, GigamonCertain statements about Siris made by portfolio company executives herein are intended to illustrate Siris’ business relationship with such persons, including with respect to Siris’ abilities as a business partner, rather than Siris’ capabilities or expertise with respect to investment advisory services. Portfolio company executives were not compensated in connection with such statements, although they generally receive compensation and investment opportunities in connection with their portfolio company roles, and in certain cases are also owners of portfolio company securities and/or investors in Siris-sponsored vehicles. Such compensation and investments subject such individuals to potential conflicts of interest in making the statements herein. Siris does not make any representation or warranty as to the accuracy or completeness of the information contained herein and it should not be assumed that investments made in the future will be comparable in quality of performance to the investments described herein.
Portfolio
Companies we have partnered with
GigamonCurrent · Dec 2023
BearComCurrent · Dec 2023
EQCurrent · Dec 2021
Newfold DigitalCurrent · Oct 2018
Constant ContactRealized · Feb 2021
TPxCurrent · Feb 2020
EFICurrent · Jul 2019
TravelportCurrent · May 2019
IntralinksRealized · Nov 2017
PolycomRealized · Sep 2016
MavenirCurrent · Aug 2016
PGiRealized · Dec 2015
Digital RiverRealized · Feb 2015
Pulse SecureRealized · Oct 2014
Stratus TechnologiesRealized · Sep 2014
TNSRealized · Feb 2013
TekelecRealized · Jan 2012
AirvanaRealized · Feb 2013
MModalRealized · Aug 2008
Our team
Combining investment acumen and hands‑on operating expertise

Frank Baker
Co-Founder & Managing Partner

Peter Berger
Chairman & Co-Founder

Jeffrey Hendren
Co-Founder & Managing Partner

Ian Silverman
Partner & Chief Financial Officer
News
Latest announcements
- BearCom Announces Transformative Acquisition of Stone Security
- BearCom Acquires The Surveillance Shop
- Gigamon Announces Significant Strategic Investment from Siris
Affiliate · October 2026
October Capital
In October 2026, Siris announced the creation of October Capital, a private equity firm dedicated to investing in services businesses that enable enterprises to adopt and scale transformative technologies.
Visit octobercapital.comExploring a partnership with Siris?
We partner with motivated management teams of technology and technology-enabled services companies.
