Castlight Health
A United States healthcare-navigation brand that helps employees compare healthcare providers, prices, and quality through an employer- and health-plan-sponsored platform.
Last updated August 25, 2026
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Overview
Castlight Health is a United States healthcare-navigation company and digital health brand focused on helping people make more informed decisions about medical care. Its platform presents healthcare information in a consumer-oriented format, including comparisons of provider prices and quality for tests, procedures, and other services. Rather than operating primarily as a direct-to-consumer subscription, Castlight historically sold access through a business-to-business model: employers licensed the platform for their workforces, while health-plan partners could make its tools available to covered commercial members. The company was founded in 2008 and developed during a period when employers, insurers, and healthcare technology companies were seeking ways to give patients greater visibility into the cost and quality of care. Castlight's proposition was that better information could encourage employees and members to select more appropriate, higher-value providers and services. The platform therefore occupied a position between employee benefits software, health-plan engagement tools, and healthcare price-transparency services. Castlight attracted substantial private investment before becoming a public company. In 2012, it secured $100 million in investment funding. It completed an initial public offering in 2014 at a reported valuation of approximately $2 billion, making it one of the more visible healthcare-technology companies of that period. The company later stated that its platform served more than 260 customers covering approximately 10 million lives. These customers and covered populations reflected Castlight's reliance on enterprise and health-plan distribution rather than individual consumer acquisition. The company's business changed materially in 2022. On January 5 of that year, Vera Whole Health announced an agreement to acquire Castlight for $370 million, with a tender offer of $2.05 per share for the outstanding Class A and Class B shares. The transaction took Castlight out of the public-company structure and placed it alongside Vera's care-delivery capabilities. An investor-rights law firm announced an investigation into whether the proposed consideration was fair to shareholders; the publicly cited reference material does not establish the outcome of that inquiry. Following the integration of Vera Whole Health and Castlight, the combined organization adopted the apree health name in September 2022. Castlight and Vera continued to exist as distinct brands within that structure, with Castlight retaining its identity as a healthcare-navigation and digital-engagement product. In late 2024, apree health and Millennium Physician Group combined to form Mosaic Health under the ownership and sponsorship structure associated with Clayton, Dubilier & Rice and Elevance Health. Castlight continued operating as a product or brand within the broader organization. Its present role is therefore best understood as an active healthcare-navigation offering rather than an independently listed company.
History
Castlight Health was founded in 2008 as a healthcare-navigation and transparency technology company. Its core proposition was to make healthcare decisions easier for employees and health-plan members by presenting information about providers, prices, and quality in a searchable and comparable format. The company developed at the intersection of employer benefits, insurance-member engagement, and digital health, addressing the difficulty consumers often face when evaluating the cost and quality of medical tests and procedures. Castlight used a business-to-business distribution model. Employers licensed the platform for their workforces, while health-plan partners could provide access to commercial members. This arrangement positioned the company as an infrastructure and engagement partner rather than as a conventional consumer healthcare marketplace. The platform's intended value was to support more informed choices and, for sponsoring organizations, potentially improve the value of healthcare spending through greater use of information. Castlight raised $100 million in investment funding in 2012. It subsequently completed an initial public offering in 2014 at a reported valuation of $2 billion. During its public-company period, Castlight described its reach as more than 260 customers covering approximately 10 million lives. The company was therefore associated with the expansion of employer-sponsored digital health tools and the broader movement toward healthcare price transparency. A major corporate transition began in January 2022, when Vera Whole Health announced that it would acquire Castlight for $370 million. The proposed transaction included a $2.05-per-share tender offer for all outstanding Class A and Class B shares. On the same day, Halper Sadeh LLP announced an investigation into whether the proposed price was fair to investors. The available reference material does not report the outcome of that investigation. The acquisition moved Castlight from an independently listed public-company context into a privately controlled healthcare organization. After the operations of Vera Whole Health and Castlight were integrated, the organization rebranded as apree health in September 2022. The two legacy identities were not immediately eliminated: Vera continued to represent the care-delivery side of the organization, while Castlight remained a recognizable healthcare-navigation product and brand. Donald Trigg, previously chief executive of Cerner Corporation, was appointed chief executive of apree health. In late 2024, apree health and Millennium Physician Group combined to create Mosaic Health. The transaction and ownership structure involved Clayton, Dubilier & Rice and Elevance Health. Castlight remained in operation as a product within the larger organization rather than returning to independent public ownership. Its historical significance lies in its early emphasis on digital healthcare navigation, employer distribution, and the presentation of price and quality information to healthcare consumers.
- 2024
Formation of Mosaic Health
[1]apree health and Millennium Physician Group combine to form Mosaic Health, with Castlight continuing as a product or sub-brand.
- 2022
Acquisition by Vera Whole Health
[1]Vera Whole Health announces a $370 million acquisition and a $2.05-per-share tender offer for Castlight's outstanding shares.
- 2022
Rebrand as apree health
[1]Following integration with Vera Whole Health, the combined organization adopts the apree health name while retaining Castlight as a distinct brand.
- 2014
Initial public offering
[1]Castlight completes an initial public offering at a reported valuation of approximately $2 billion.
- 2012
Raises $100 million in investment funding
[1]The company secures $100 million in investment funding to develop and expand its healthcare-navigation platform.
- 2008
Castlight Health is founded
[1]Castlight Health is established as a healthcare-navigation and healthcare-transparency technology company.
Products and positioning
Enterprise healthcare navigation and transparency technology that helps employees and health-plan members compare care options and make more informed choices using price and quality information.
Healthcare navigation and transparency software
Castlight platform
The Castlight platform is an employer- and health-plan-sponsored digital healthcare-navigation service. It gives eligible employees or members tools for comparing healthcare providers and services using available price and quality information. The platform is licensed through a business-to-business model and is designed to support decisions about tests, procedures, and other forms of care. Its role within the later apree health and Mosaic Health structures is that of a continuing product and brand.
Controversies
2022
Investigation into the fairness of the proposed acquisition price
After Vera Whole Health announced its proposed acquisition of Castlight, Halper Sadeh LLP announced an investigation into whether the $2.05-per-share tender offer fairly valued Castlight's Class A and Class B shares. The available reference material does not identify the investigation's final outcome.
2022
Shareholder files lawsuit over Castlight acquisition
Castlight Health shareholder Deven Shah filed a lawsuit alleging securities-law violations related to the proposed merger with Vera Whole Health. The complaint alleges flaws in the sale process and deficiencies in Castlight's recommendation statement; these are allegations, not determinations.
Brand decisions
2022
Accepted acquisition by Vera Whole HealthM&ABackground
Castlight operated as a public healthcare-navigation company, while Vera Whole Health operated in healthcare delivery and related services.
Action taken
Vera announced a $370 million acquisition and offered $2.05 per share for Castlight's outstanding Class A and Class B shares.
Aftermath
Castlight left the independent public-company structure and was integrated with Vera. The combined organization later adopted the apree health name.
Proposed acquisition value. US$370 million (Announced January 5, 2022)
2022
Rebranded the integrated organization as apree healthStrategyBackground
Vera Whole Health and Castlight integrated their operations after the acquisition.
Action taken
The combined organization adopted apree health as its umbrella identity while keeping Castlight as a distinct product and brand.
Aftermath
Castlight continued to operate within the larger apree health structure and subsequently within Mosaic Health.
2014
Pursued public-market financing through an initial public offeringStrategyBackground
Castlight had developed an enterprise healthcare-navigation platform distributed through employers and health-plan partners.
Action taken
The company completed an initial public offering at a reported valuation of approximately $2 billion.
Aftermath
The IPO established Castlight as a publicly traded healthcare-technology company before its later acquisition by Vera Whole Health.
Recent events
- 2024
apree health and Millennium Physician Group form Mosaic Health[1]
M&A
In late 2024, apree health and Millennium Physician Group combined to form Mosaic Health, with Castlight continuing as a product or sub-brand within the wider organization.
- 2022
Vera Whole Health announces agreement to acquire Castlight Health[1]
M&A
Vera Whole Health announced a proposed $370 million acquisition of Castlight, including a tender offer of $2.05 per share for Castlight's outstanding Class A and Class B shares.
- 2022
Vera Whole Health and Castlight rebrand as apree health[1]
M&A · Other
After integrating their operations, Vera Whole Health and Castlight adopted apree health as the combined organization's name, while retaining Castlight as a distinct brand and product.
Sources2 sources
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