Open-Silicon
OpenFive is the name adopted for Open-Silicon's custom semiconductor design business after its acquisition by SiFive.
Last updated August 31, 2026
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Overview
OpenFive is a semiconductor design business whose origins lie in Open-Silicon, an American fabless semiconductor company founded in 2003. Open-Silicon specialized in custom application-specific integrated circuit (ASIC) and system-on-chip (SoC) development for customers that needed tailored silicon but did not operate their own fabrication facilities. Its work covered the design and implementation of custom integrated circuits, derivative chip designs, low-power optimization, and management of semiconductor process variability. The original company was established by Naveed Sherwani, Satya Gupta, and Scott Houghton, with early financial backing from Sequoia Capital, Norwest Venture Partners, and InterWest Partners. Open-Silicon expanded its technical capabilities through acquisitions. In 2007 it acquired Zenasis Technologies, a developer of processor-optimization electronic design automation software. Open-Silicon subsequently applied and extended that technology toward low-power design and process-variation management. In 2009 it acquired Silicon Logic Engineering, a design-services firm, strengthening its ability to produce derivative integrated-circuit designs and provide engineering support around existing chip architectures. The company developed a proprietary ASIC development approach known as OpenMODEL. Its operating footprint also broadened during the 2010s. It established facilities in Research Triangle Park, North Carolina, and Pune, India, in 2010, and later expanded design operations in Pakistan and Taiwan. These locations supported customer engineering, derivative IC development, and distributed semiconductor-design activities. Ownership changed materially during the company's independent period. In December 2007, Unicorn Investment Bank acquired a 75 percent interest in Open-Silicon for a reported $190 million, while employees retained the remaining ownership. The company later became part of SiFive. Reference material describes the transaction as occurring in August 2020, while the Wikipedia account places the acquisition in September 2021; in either case, the business was renamed OpenFive and operated as an independent SiFive business unit. SiFive subsequently sold the OpenFive business to Alphawave Semi. Reference material gives March 2022 as the sale period, while the cited transaction account records completion on September 1, 2022, for $210 million. Under Alphawave, OpenFive represents a custom-silicon and semiconductor-design capability rather than a mass-market consumer brand. Its relevance is primarily business-to-business: it supports organizations developing specialized SoCs and ASICs, including designs requiring differentiated performance, power efficiency, process-portability, or integration with broader semiconductor intellectual property. Publicly available material provides limited detail about the unit's current product catalog, leadership, customer list, and standalone financial performance. Accordingly, OpenFive is best understood as the successor brand and business unit of Open-Silicon within the semiconductor design and licensing ecosystem.
History
Open-Silicon was founded in 2003 in the United States by Naveed Sherwani, Satya Gupta, and Scott Houghton. It entered the semiconductor industry as a fabless company, meaning that it developed integrated circuits and relied on external manufacturing partners rather than operating its own fabrication plants. Its principal focus was custom silicon, especially application-specific integrated circuits and system-on-chip designs for customers with specialized technical requirements. The company received early backing from Sequoia Capital, Norwest Venture Partners, and InterWest Partners. Its growth strategy combined organic engineering expansion with acquisitions. In May 2007, Open-Silicon acquired Zenasis Technologies, whose processor-optimization electronic design automation software became part of Open-Silicon's technology portfolio. The company expanded the acquired capabilities toward low-power chip design and the management of semiconductor process variability. In December of the same year, Unicorn Investment Bank acquired a 75 percent stake in Open-Silicon for a reported $190 million; employees retained the balance of the equity according to the cited historical account. Open-Silicon continued to develop its services and intellectual-property capabilities in 2009 through the acquisition of Silicon Logic Engineering. This transaction enhanced its ability to undertake derivative integrated-circuit designs, in which an existing chip architecture or platform is adapted for a particular application, customer, or manufacturing process. In 2010, the company opened facilities at Research Triangle Park in North Carolina and in Pune, India. It later developed substantial design operations in Pakistan and Taiwan, creating a geographically distributed engineering organization. The company's ASIC development methodology was called OpenMODEL. Although public descriptions provide limited technical detail about the methodology, it represented Open-Silicon's structured approach to custom-chip development and supported its broader design-services model. The company's activities included custom SoC design, ASIC implementation, derivative IC development, processor optimization, low-power engineering, and process-variation management. Open-Silicon eventually became part of SiFive. The supplied reference material dates the acquisition to August 17, 2020, whereas the Wikipedia summary describes the acquisition as occurring in September 2021. Following the transaction, the business was renamed OpenFive and operated as an independent unit within SiFive. The change reflected a shift from the historic Open-Silicon name to a brand associated with SiFive's broader semiconductor and open-computing ecosystem. SiFive later sold the OpenFive business to Alphawave Semi. The provided material gives March 2022 as the sale period, while the cited historical account records the transaction's completion on September 1, 2022, for $210 million. The date discrepancy is retained here rather than resolved without an additional authoritative source. After the transaction, OpenFive became part of Alphawave Semi's semiconductor design and connectivity-related business activities. OpenFive is not primarily a consumer-facing product brand. It is a specialized semiconductor engineering and custom-silicon business serving other technology companies. Public information does not establish a complete current catalog, customer roster, executive list, or standalone financial profile. Its documented historical significance lies in its custom ASIC and SoC expertise, its acquisitions in design automation and engineering services, its international design footprint, and its succession from Open-Silicon through SiFive to Alphawave Semi.
- 2022
OpenFive is sold to Alphawave Semi
[1]Alphawave Semi acquired SiFive's OpenFive business. The cited account records completion on September 1, 2022, for $210 million.
- 2020
SiFive acquisition and OpenFive rebranding
[1]Reference material dates SiFive's acquisition to August 17, 2020. The acquired business was renamed OpenFive and operated as an independent SiFive unit.
- 2012
Design operations expand in Pakistan and Taiwan
[1]The company developed substantial design operations in Pakistan and Taiwan as part of its international engineering footprint.
- 2010
New engineering facilities open in North Carolina and India
[1]Open-Silicon opened facilities in Research Triangle Park, North Carolina, and Pune, India, to support derivative IC design and customer engineering.
- 2009
Silicon Logic Engineering is acquired
[1]The acquisition expanded Open-Silicon's derivative IC design and semiconductor engineering capabilities.
- 2007
Zenasis Technologies is acquired
[1]Open-Silicon acquired Zenasis Technologies and obtained processor-optimization EDA technology that was later developed for low-power design and process-variability management.
- 2007
Unicorn Investment Bank becomes majority owner
[1]Unicorn Investment Bank acquired 75 percent of Open-Silicon for a reported $190 million, with the balance remaining employee-owned.
- 2003
Open-Silicon is founded
[1]Naveed Sherwani, Satya Gupta, and Scott Houghton founded Open-Silicon as a fabless semiconductor company focused on custom ASIC and SoC design.
Products and positioning
A business-to-business custom-silicon design and semiconductor engineering brand serving customers that require tailored ASICs, SoCs, and derivative integrated circuits without maintaining an in-house fabless design organization.
ASIC development methodology
OpenMODEL
OpenMODEL was Open-Silicon's named methodology for ASIC development. It formed part of the company's structured approach to delivering custom silicon and supported its engineering services for customers developing application-specific integrated circuits and related SoCs. Public reference material identifies the methodology but does not provide enough detail to describe its individual stages or tooling.
Semiconductor design services · 2003
Custom ASIC design services
Open-Silicon's core business centered on the design and development of custom application-specific integrated circuits. These services were aimed at customers requiring differentiated silicon without operating a manufacturing facility, and included design implementation and engineering support across the ASIC development process.
System-on-chip design · 2003
Custom SoC design
The company developed custom system-on-chip solutions integrating multiple functional elements into customer-specific silicon. The documented business model positioned this work within a broader fabless design-services offering rather than as a standardized retail chip family.
Semiconductor engineering · 2009
Derivative IC design
Derivative integrated-circuit design adapted existing chip architectures or platforms for particular customer requirements. Open-Silicon strengthened this capability through its acquisition of Silicon Logic Engineering and later supported it through facilities in North America, India, Pakistan, and Taiwan.
Chip optimization technology · 2007
Low-power and process-variability optimization
Following the acquisition of Zenasis Technologies, Open-Silicon expanded processor-optimization technology toward low-power design and semiconductor process-variability management. The available sources do not identify a separate commercial product name for these capabilities.
Brand decisions
2022
Sell OpenFive to Alphawave SemiM&ABackground
SiFive decided to divest its OpenFive business unit.
Action taken
Alphawave Semi acquired the OpenFive business from SiFive.
Aftermath
OpenFive became part of Alphawave Semi's semiconductor design and licensing activities. The cited transaction account records a $210 million purchase price.
Acquisition price. 210000000 USD (Transaction completed September 1, 2022)
2020
Join SiFive and adopt the OpenFive nameM&ABackground
SiFive acquired the Open-Silicon business as part of its semiconductor technology expansion.
Action taken
SiFive renamed the acquired business OpenFive and operated it as an independent business unit.
Aftermath
The historic Open-Silicon business continued under the OpenFive identity within SiFive until its subsequent sale.
2009
Acquire Silicon Logic EngineeringM&ABackground
Open-Silicon aimed to strengthen its engineering-services platform and derivative IC design capabilities.
Action taken
The company acquired Silicon Logic Engineering.
Aftermath
The transaction enhanced Open-Silicon's ability to deliver derivative integrated-circuit designs.
2007
Acquire Zenasis TechnologiesM&ABackground
Open-Silicon sought to broaden its semiconductor optimization and electronic design automation capabilities.
Action taken
It acquired Zenasis Technologies and incorporated its processor-optimization technology into Open-Silicon's portfolio.
Aftermath
The technology was expanded for low-power design and process-variability management.
Recent events
- 2022
Alphawave Semi acquires SiFive's OpenFive business[1]
M&A
Alphawave Semi acquired the OpenFive business from SiFive. The cited transaction account records completion on September 1, 2022, while other reference material describes the sale as taking place in March 2022.
- 2020
SiFive acquires Open-Silicon and renames the business OpenFive[1]
M&A · Leadership change
Reference material dates SiFive's acquisition of Open-Silicon to August 17, 2020, after which the company was renamed OpenFive and operated as an independent SiFive business unit.
- 2009
Open-Silicon acquires Silicon Logic Engineering[1]
M&A
The acquisition of Silicon Logic Engineering expanded Open-Silicon's design-services capabilities and strengthened its derivative integrated-circuit development activities.
- 2007
Open-Silicon acquires Zenasis Technologies[1]
M&A
Open-Silicon acquired Zenasis Technologies, adding processor-optimization electronic design automation technology that was later expanded for low-power design and semiconductor process-variability management.
- 2007
Unicorn Investment Bank acquires majority stake in Open-Silicon[1]
M&A
Unicorn Investment Bank acquired a 75 percent interest in Open-Silicon. The remaining interest was held by employees according to the cited company history.
Sources1 sources
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