UKG is a private American enterprise-software company providing human capital management, payroll, workforce management, and employee-experience technologies.
Last updated August 31, 2026
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Overview
UKG, formerly expanded as Ultimate Kronos Group, is an American multinational enterprise-software company focused on human capital management (HCM), payroll, workforce management (WFM), and employee-experience services. The company was created through the combination of Ultimate Software and Kronos Incorporated, two established providers whose products served complementary areas of the workforce-technology market. Ultimate Software was widely associated with cloud-based human resources and payroll applications, while Kronos had a long history in timekeeping, scheduling, labor analytics, and workforce-management systems. Ultimate Software and Kronos announced their combination on February 20, 2020. The transaction brought together two large, privately held technology businesses in a deal reported as having an enterprise value of approximately $22 billion. The merger was completed on April 1, 2020. The combined company initially operated under the merger structure before announcing the UKG name in August 2020; the UKG branding became effective on October 1 of that year. The name reflects the two predecessor companies while presenting the business as a unified technology platform rather than as a collection of separate products. UKG serves employers that need to manage the employee lifecycle and the operational realities of work. Its offerings cover recruiting and onboarding, core human resources, payroll, benefits administration, employee records, talent and performance processes, time and attendance, scheduling, absence management, labor forecasting, compliance, and workforce analytics. The company sells products to organizations ranging from mid-sized employers to large multinational enterprises, with particular relevance in sectors where shift work, complex labor rules, hourly employees, or distributed operations make workforce administration difficult. The company’s principal product families include UKG Pro, UKG Ready, and UKG Dimensions, together with related products such as UKG HR Service Delivery, UKG Virtual Roster, and UKG OneView. UKG Pro is positioned as a broad HCM suite for larger and more complex organizations. UKG Ready is aimed more toward small and mid-sized businesses seeking an integrated human-resources, payroll, and workforce platform. UKG Dimensions is a cloud workforce-management environment designed around timekeeping, scheduling, labor optimization, compliance, and workforce data. UKG also presents its technology as an increasingly unified and AI-oriented workplace platform, linking HR information with operational workforce decisions and employee-facing services. UKG operates in a highly competitive HR-technology market that includes ADP, Dayforce, Oracle, SAP SuccessFactors, Workday, and other payroll, HCM, and workforce-management vendors. Its differentiation is based on combining the HCM heritage of Ultimate Software with Kronos’s workforce-management expertise. This positioning is especially relevant to healthcare, retail, hospitality, manufacturing, public-sector, education, logistics, and other industries where staffing levels and employee schedules directly affect service delivery. The company remains privately held. Hellman & Friedman, which controlled both predecessor companies, is the controlling shareholder of UKG. Blackstone is reported as a significant minority investor, with additional institutional participation from investors including GIC, the Canada Pension Plan Investment Board, and JMI Equity. UKG maintains dual headquarters in Lowell, Massachusetts, and Weston, Florida. In July 2024, Jennifer Morgan became chief executive officer. UKG also operates the Workforce Institute, a research and educational initiative established in 2007 that publishes workforce studies and maintains the Workforce Activity Report, an index based on shift-work data from millions of workers and tens of thousands of U.S. businesses.
History
UKG’s history combines two different strands of enterprise workforce technology. Ultimate Software developed a reputation for cloud-based human resources and payroll applications, while Kronos Incorporated built a substantial business around timekeeping, scheduling, labor management, and workforce analytics. Their combination reflected a broader industry movement toward integrated cloud platforms capable of connecting employee records and payroll with the operational decisions that determine when, where, and how people work. On February 20, 2020, Ultimate Software and Kronos announced an agreement to create a new cloud-computing company specializing in human capital management and workforce management. The transaction was reported at an approximate value of $22 billion and was intended to create one of the largest dedicated providers in the HR-technology sector. The merger was completed on April 1, 2020. In August, the combined business announced the Ultimate Kronos Group name, abbreviated as UKG, and the new brand became effective on October 1. The merged company entered a competitive market that included ADP, Ceridian, Oracle, SAP SuccessFactors, Workday, Taleo, and other providers. UKG’s strategic rationale was to offer a broader platform than either predecessor could provide alone: HCM and payroll capabilities associated with Ultimate Software could be paired with Kronos’s expertise in hourly workforces, labor rules, attendance, scheduling, and shift operations. The resulting product portfolio addressed both corporate HR departments and operational managers responsible for frontline staffing. UKG’s major product families include UKG Pro, UKG Ready, and UKG Dimensions. Pro provides an extensive HCM environment for larger organizations, while Ready is designed for smaller and mid-sized employers. Dimensions provides cloud workforce-management capabilities, including time capture, scheduling, absence management, labor analytics, and compliance support. Additional offerings extend the platform into HR service delivery, roster management, and cross-system workforce visibility. The company’s public profile was affected by a ransomware incident disclosed in December 2021. The attack was first detected on December 11 and affected the Kronos Private Cloud service used by a broad set of commercial and public-sector organizations. Customers reported operational consequences involving timekeeping, payroll preparation, and workforce administration. Some reporting raised the possibility that the incident was related to the Log4Shell vulnerability, but UKG stated that it had no evidence that Log4Shell was responsible for the ransomware event. The incident highlighted the dependence of large employers on third-party workforce infrastructure and the business continuity risks associated with centralized cloud services. UKG also maintains the Workforce Institute, a research and educational initiative established in 2007. It produces studies and commentary on human-capital issues, workplace organization, accessibility, employee experience, and workforce trends. Its Workforce Activity Report analyzes shift-work patterns from more than four million people across more than 35,000 U.S. businesses and is released in connection with the monthly U.S. employment-report cycle. The institute gives UKG a research and thought-leadership presence beyond its software products. Ownership remains private. Hellman & Friedman is the controlling shareholder, having controlled both predecessor businesses. Blackstone is a major minority investor, with other reported investors including GIC, the Canada Pension Plan Investment Board, and JMI Equity. UKG has dual headquarters in Lowell, Massachusetts, and Weston, Florida. In July 2024, Jennifer Morgan became chief executive officer. The company currently presents itself as an AI-oriented workplace operating platform that unifies HR, payroll, workforce management, and employee-facing services.
- 2024
Jennifer Morgan becomes CEO
[1]Jennifer Morgan takes over as chief executive officer in July.
- 2021
Kronos Private Cloud ransomware incident
[1]UKG discloses a ransomware attack that disrupts the Kronos Private Cloud service used by many organizations.
- 2020
Ultimate Software and Kronos announce their combination
[1]The companies announce a planned cloud-software combination valued at approximately $22 billion.
- 2020
Merger closes
[1]The combination of Ultimate Software and Kronos is completed on April 1.
- 2020
UKG brand launches
[1]The Ultimate Kronos Group name is announced in August and becomes effective on October 1.
- 2007
Workforce Institute is established
[1]The Workforce Institute is established as a research and education platform focused on human-capital management and workforce issues.
Products and positioning
An integrated workplace operating platform for human capital management, payroll, employee experience, and workforce management, with particular strength in complex and frontline workforces.
Human capital management suite
UKG Pro
UKG Pro is the company’s broad HCM suite for larger and more complex employers. It brings together core HR, payroll, talent, benefits, employee data, reporting, and related workforce processes. The product is intended to provide a central system for managing the employee lifecycle while supporting enterprise reporting, compliance, and employee self-service.
Workforce management
UKG Dimensions
UKG Dimensions is a cloud workforce-management platform focused on operational labor needs. Its capabilities include time and attendance, scheduling, absence management, labor forecasting, workforce analytics, and compliance-oriented controls. It is particularly relevant to organizations with hourly, shift-based, distributed, or highly regulated workforces.
Small and mid-sized business HCM
UKG Ready
UKG Ready is an integrated HR, payroll, time, talent, and workforce-management platform aimed primarily at small and mid-sized organizations. It combines administrative and employee-facing functions in a single cloud environment, allowing employers with fewer specialist HR resources to manage payroll, records, scheduling, time capture, and related processes.
HR service management
UKG HR Service Delivery
UKG HR Service Delivery supports the delivery of HR information and services to employees and managers. It is positioned around self-service, case and request handling, knowledge access, and the digitization of common HR interactions.
Roster and scheduling management
UKG Virtual Roster
UKG Virtual Roster is a workforce-management offering for organizations that need to coordinate staffing rosters, assignments, and availability. It is associated with the company’s broader focus on matching workforce capacity with operational demand.
Workforce data and analytics
UKG OneView
UKG OneView is a platform offering intended to provide a consolidated view of workforce information and processes. It supports the broader UKG strategy of connecting HR, payroll, workforce-management, and employee-experience data.
Controversies
2022
Ransomware attack exposes Puma employee information stored with Kronos
Reports and breach notifications said a ransomware attack on Kronos’s systems resulted in personal information belonging to 6,632 Puma employees being stolen. Puma said no customer data was affected. UKG/Kronos said it brought in cybersecurity experts, notified authorities, and communicated with impacted users.
2021
Kronos Private Cloud ransomware attack
UKG disclosed in December 2021 that a ransomware attack, first detected on December 11, had affected the Kronos Private Cloud service. The platform was used by many major employers and public entities for workforce-management functions, creating disruption risks for timekeeping, payroll preparation, and scheduling. Some reports suggested a possible connection with the Log4Shell vulnerability, but UKG said it had no evidence that Log4Shell caused the ransomware incident.
Brand decisions
2020
Combine Ultimate Software and KronosM&ABackground
Ultimate Software and Kronos operated in complementary areas of workforce technology, with one emphasizing HCM and payroll and the other emphasizing workforce management and operational labor systems.
Action taken
The companies agreed to form a combined cloud-software business and completed the merger on April 1, 2020.
Aftermath
The combined company was subsequently branded Ultimate Kronos Group, or UKG, and positioned as an integrated HCM and workforce-management provider.
Reported transaction valuation. $22 billion (2020)
2020
Adopt the UKG corporate brandStrategyBackground
Following the merger, the combined company needed a unified identity for its software portfolio and market presence.
Action taken
The company announced the Ultimate Kronos Group name in August and made the UKG brand effective on October 1.
Aftermath
UKG became the public-facing identity for the combined HCM and workforce-management business.
Recent events
Reported
Electric relaunches with AI-powered IT and HR automation platform[4]
Electric relaunched the company on August 25, 2026, debuting an AI platform that automates IT and HR tasks for small and midsize businesses, distributed through a payroll partner network including ADP, Paychex, Paycor, UKG, Justworks, isolved, and TriNet.
- Unconfirmed
Reported
Ransomware attack exposes Puma employee information stored with Kronos[3]
Reports and breach notifications said a ransomware attack on Kronos’s systems resulted in personal information belonging to 6,632 Puma employees being stolen. Puma said no customer data was affected. UKG/Kronos said it brought in cybersecurity experts, notified authorities, and communicated with impacted users.
Reported
Visier and UKG announce technology partnership[5]
Visier announced a strategic technology partnership with UKG to advance workforce management capabilities. The Visier and UKG Pro integration was available to customers at the time of the announcement.
Reported
UKG and Rain India announce workforce-data partnership[6]
UKG and Rain India announced a strategic partnership to integrate Rain’s mobile app with UKG Dimensions, providing organisations with real-time workforce data and employees with on-demand access to earned wages.
Reported
OneLogin announced its 2020 customer and partner award winners[7]
OneLogin announced the winners of its annual customer and partner awards at Connect 2020. The recognized companies included Virgin Hyperloop, Livongo, Amazon Web Services, CDW, UKG, BetterCloud, ReadyNetworks, LevelData, OnePath and NTT.
Sources7 sources
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