Prior Investments
Since the firm’s founding over 20 years ago, we have invested in some of the most innovative and significant technology companies of our time. Sigma knows what it takes to help entrepreneurs turn creative ideas into sustainable businesses.
Initial Investment: July 2001
Equalogic, Inc.
Acquired by Dell, EqualLogic focuses on building intelligent storage solutions which drastically reduce the cost and complexity of owning and managing storage.
Acquired by Dell for $1.4 billion, January 2008
Initial Investment: December 2002
BroadWare Technologies
Acquired by Cisco Systems, BroadWare Technologies provides a distributed management platform for real-time, networked video applications to government, defense, transportation and enterprise customers. The company sells into both homeland defense opportunities and commercial security deployments.
Acquired by Cisco Systems, June 2007
Initial Investment: September 2003
m-Qube
Watertown, MA
Acquired by Verisign, Inc., m-Qube is the recognized market leader in delivering premium messaging and content services that can reach more than 200 million wireless subscribers in North America.
Acquired by Verisign, Inc., May 2006
Initial Investment: November 2002
Topio
Acquired by Network Appliance (NetApp), Topio develops next-generation data replication solutions that dramatically extend an enterprise's disaster recovery capabilities. Topio enables system-wide consistent disaster recovery for heterogeneous SAN environments, storage subsystems, DAS, and storage virtualization schemes using TCP/IP or other standard networking environments.
Acquired by Network Appliance, December 2006
Initial Investment: November 2001
Talking Blocks
San Francisco, CA
Sold to Hewlett Packard, Talking Blocks was a pioneer in management of web services architectures within the enterprise.
Acquired by HP, September 2003
Initial Investment: July 1999
Celebrate Express.com, Inc
Kirkland, WA
The leading online marketer of celebration products for children, Birthday Express grew rapidly and achieved profitability during the worst of the dot-com downturn.
IPO October 2004
Initial Investment: May 1999
Tradex Technologies, Inc
Tampa, FL
A developer of web marketplace creation and management systems, Tradex became a key component of Ariba Systems.
Acquired by Ariba, Inc
Initial Investment: December 1998
StorageNetworks, Inc
Wellesley, MA
As the first company to recognize the ability of high-speed public networks to transform storage architectures, StorageNetworks pioneered IP-based remote storage services.
IPO 2000
Initial Investment: August 1998
Octane Software, Inc
San Mateo, CA
A pioneer in Internet-enabled customer relationships management systems, Octane was acquired by e.Piphany for $3.2 billion.
Acquired by e.Piphany, March 2000
Initial Investment: May 1998
eDOCS, Inc
Westborough, MA
Later sold to Seibel Systems, eDOCS enabled businesses to use the billing process to enhance their customer relationships.
Acquired by Siebel Systems, January 2005
Initial Investment: April 1998
Obsidian, Inc
Fremont, CA
Acquired by Applied Materials, Obsidian developed an innovative chemical-mechanical planarization tool for semiconductor processing
Acquired by Applied Materials, October 1999
Initial Investment: February 1998
Oberon Software, Inc
Cambridge, MA
Later acquired OnDisplay, Oberon combined transformational logic engines with application data integration
Acquired by OnDisplay, January 2000
Initial Investment: November 1997
Paradise Electronics, Inc
San Jose, CA
Merged with Genesis Microelectronics to become the leading provider of flat-panel display processors.
Acquired by Genesis Microchip, January 1999
Initial Investment: June 1997
Argon Networks, Inc
Littleton, MA
Acquired by Siemens AG, February 1999
Initial Investment: June 1997
Datasage, Inc
Reading, MA
Acquired by Vignette, January 2000
Initial Investment: June 1997
O-In Design Automation, Inc
San Jose, CA
Sold to Mentor Graphics, 0-In pioneered assertion based verification of integrated circuits.
Acquired by Mentor Graphics, September 2004
Initial Investment: May 1997
Novera Software, Inc
Burlington, MA
Acquired by Mercator, September 1999
Initial Investment: March 1997
SalesLogix Corp
Scottsdale, AZ
Later acquired by Sage, SalesLogix was a leader in mid-market sales management systems.
IPO May 1999
Initial Investment: January 1997
Xiotech Corp
Eden Prairie, MN
Created a break-though cost-performance point with its innovative enterprise storage system.
Acquired by Seagate, January 2000
Initial Investment: February 1996
Vignette Corp
Austin, TX
Originally a pioneer in dynamic web content management, Vignette now provides an array of applications for managing information through the web.
IPO February 1999
Initial Investment: February 1996
Internet Security Systems, Inc
Norcross, GA
Pioneers in internet security assessment and intrusion detection. ISS is an industry leader and one of the most successful technology companies in the Southeast.
IPO March 1998
Initial Investment: January 1996
Splash Technology, Inc
Sunnyvale, CA
A spinout of Radius and SuperMac, Splash developed open-systems color-management processors for advanced color printers.
IPO October 1996
Initial Investment: January 1996
Books24x7.com
Needham, MA
Acquired by Skillsoft, December 2001
Initial Investment: October 1995
Rendition, Inc
Mountain View, CA
Acquired by Micron Technology, September 1998
Initial Investment: September 1995
Cerulean Technology, Inc
Marlborough, MA
Acquired by Aether Systems, September 2000
Initial Investment: February 1995
Dazel Corporation
Austin, TX
Acquired by HP, September 1998
Initial Investment: January 1995
Vermeer Technologies, Inc
Cambridge, MA
The first internet tools company, Vermeer became Microsoft's first significant step into the Internet.
Acquired by Microsoft, January
Initial Investment: August 1994
Vivo Software, Inc
Waltham, MA
Acquired by RealNetworks, March 1998
Initial Investment: May 1994
R2 Technology
Sunnyvale, California
R2 Technology, Inc., a medical imaging company, is a recognized leader in the development and commercialization of computer-aided detection (CAD), an innovative technology that assists radiologists in the early detection of breast cancer.
Acquired by Hologic, July 2006
Initial Investment: September 1993
GeoTel Communications Corp
Littleton, MA
A pioneer in bringing the capabilities of modern telephone networks to the call center industry.
IPO November 1996
Initial Investment: August 1993
Ray Dream, Inc
Mountain View, CA
Acquired by Fractal Design, May 1996
Initial Investment: June 1993
International Network Services
Mountain View, CA
Installing and managing IP-based networks throughout the world, INS built a billion dollar business
IPO September 1996
Initial Investment: March 1993
Worldtalk Corp
Santa Clara, CA
IPO April 1996
Initial Investment: March 1993
PSINet, Inc
Herndon, VA
The first commercial internet provider and the first venture-backed internet company, PSINet defined the network architecture of the modern Internet.
IPO May 1995
Initial Investment: October 1992
Clarify, Inc
San Jose, CA
One of the pioneers in the development of the CRM market, Clarify established a large new software market segment before the entrenched software companies could react.
IPO November 1995
Initial Investment: September 1992
Personal Training Systems
Menlo Park, CA,
Acquired by CBT Co, November 1995
Initial Investment: June 1992
Harmonic Lightwaves, Inc
Santa Clara, CA
IPO May 1995
Initial Investment: May 1992
Global Village Communications
Sunnyvale, CA
IPO February 1994
Initial Investment: May 1992
Applied Digital Access, Inc
San Diego, CA
IPO March 1994
Initial Investment: September 1991
Edify Corporation
Santa Clara, CA
IPO May 1996
Initial Investment: June 1991
Cascade Communications Corp
Westford, MA
A pioneer in frame relay and ATM networking products, Cascade devices formed the heart of the Internet switching fabric in the 1990s
IPO July 1994
Initial Investment: May 1991
OnStream Networks, Inc
Santa Clara, CA
Acquired by 3Com, Oct-96
Initial Investment: March 1991
Acumos, Inc
Foster City, CA
Acquired by Cirrus Logic, Acumos became the heart of the Cirrus Logic accelerated graphics controller business.
Acquired by Cirrus Logic, April 1992
Initial Investment: May 1990
Atria Software, Inc
Natick, MA
One of the most successful software engineering tool startups in history, Atria developed a high-growth and highly profitable business with a product line that paralleled tools freely available in Berkeley Unix.
IPO May 1994
Initial Investment: April 1990
Aviva Sport, Inc
Acquired by Mattel, Inc, August 1991
Initial Investment: October 1989
Tylan General
San Diego, CA
IPO January 1985
Initial Investment: June 1989
Synernetics, Inc
North Billerica, MA
Acquired by 3Com January 1994
Initial Investment: May 1989
STAC Electronics
San Diego, CA
IPO May 1992
Initial Investment: December 1988
Electronic Arts
San Mateo, CA
The first significant developer of entertainment software for the PC and game machine market, EA continues to dominate its category.
IPO September 1989
Initial Investment: September 1988
SuperMac Technology
Sunnyvale, CA
Sigma led the purchase of the SuperMac division of Scientific Micro Systems and turned it into one of the top two providers of MacIntosh system enhancement products.
IPO May 1992
Initial Investment: March 1988
Phoenix Technologies, Ltd
Norwood, MA
The primary provider of PC BIOS software, Phoenix, together with Microsoft, enabled the growth of the entire PC-compatible computer industry.
IPO June 1988
Initial Investment: January 1988
Logic Modeling Corporation
Milpitas, CA
Acquired by Synopsys February 1994
Initial Investment: November 1987
Kofax Image Products, Inc
Irvine, CA
IPO October 1997
Initial Investment: June 1987
Wellfleet Communications, Inc
Bedford, MA
Later merged with Synoptics, Wellfleet was the early technology leader in network routing equipment.
IPO July 1991
Initial Investment: April 1987
The Tigon Corporation
Dallas, TX
Acquired by Ameritech
Initial Investment: March 1987
Octel Communications Corporation
Milpitas, CA
Later sold to Lucent, Octel became the leading voice mail equipment manufacturer
IPO February 1988
Initial Investment: February 1987
Epoch Systems, Inc
Westborough, MA
The pioneer in hierarchical storage management across mixed on-line storage media.
Acquired by EMC Corp
Initial Investment: December 1986
Tencor Instruments
Mountain View, CA
The merger of KLA and Tencor Instruments, a Sigma portfolio company, created the world's leading provider of semiconductor inspection equipment.
IPO March 1993
Initial Investment: December 1986
Novellus Systems, Inc.
San Jose, CA
Building upon its expertise in chemical-vapor deposition, Novellus has become one of the world's leading suppliers of semiconductor manufacturing equipment.
IPO August 1988
Initial Investment: November 1986
The Office Club, Inc
Concord, CA
IPO December 1988
Initial Investment: August 1986
Xyplex, Inc
Boxborough, MA
IPO April 1991
Initial Investment: May 1986
Iris Graphics, Inc
Bedford, MA
Acquired by Scitex Corp, March 1990
Initial Investment: April 1986
MIPS Computer Systems, Inc
Sunnyvale, CA
The pioneer in advanced RISC processors, the MIPS architecture remains today one of the most widely used processor families.
IPO 1989
Initial Investment: December 1985
VeriFone, Inc
Redwood City, CA
Prior to its purchase by Hewlett Packard, Verifone built a dominant position in retail point-of-sale credit verification systems.
IPO March 1990
Initial Investment: November 1985
Chipcom Corporation
Southborough, MA
A pioneer in transmitting Ethernet over fiber optic cable.
IPO May 1991
Initial Investment: February 1985
FileNet Corporation
Costa Mesa, CA
IPO July 1987