Combination Results in Category Leader Delivering Best-in-Class HR Solutions to More than 350,000 Employers

PLEASANTON, Calif. and PORTLAND, Ore. (July 11, 2019) – ThinkHR and Mammoth HR today announced details of their recent merger. Acknowledged as the industry’s two leading companies providing technology-enabled HR solutions to employers, the merger leverages the companies’ complementary capabilities, software platforms, and industry expertise.

Founded in 2005, Pleasanton, Calif.-based ThinkHR provides People Risk Management solutions primarily through the insurance market, with a growing presence in the PEO and payroll provider categories. Founded in 2001, Portland, Ore.-based Mammoth HR provides Collaborative HR solutions primarily through the payroll and HCM market, with a growing presence in the PEO and insurance categories.

Both companies bring together the technology, content, and subject matter expertise needed to help employers manage their compliance responsibilities and engage their people. Together, the companies support more than 350,000 employers nationwide through a network of more than 1,700 partners in the insurance, payroll, HCM, and PEO industries.

Mammoth CEO, Nathan Christensen, is the new CEO of the combined company. ThinkHR CEO, Larry Dunivan, will move into the position of Executive Chairman.

Christensen commented, “HR is increasing as both a pain point and a strategic opportunity for employers. As demand for solutions to address today’s HR challenges accelerates, we have an exciting opportunity to bring together the two market leaders to transform the HR experience for employers. We’re committed to working with our industry-leading partners to deliver innovative solutions and an unparalleled customer experience to help HR teams more effectively manage their compliance responsibilities and build great workplaces.”

Dunivan added, “These two organizations have developed unique expertise in their respective segments. Bringing the two companies together will extend the reach, creating opportunities to innovate further and drive superior customer experiences.”

NextGen Insights founder, Yvette Cameron, who focuses on next-generation Human Capital Management (HCM) processes and technologies, shared, “Given the rapid speed of innovation, globalization and shifting workforce demographics, the role of HR has become even more strategic. Whether managing the day-to-day or supporting transformation in their organizations, HR professionals need partners with the power resulting from this combination that can reduce the risks inherent in people management while presenting opportunities for growth.”

The combined company will operate two headquarters, one in Pleasanton and one in Portland. A third office is located in Milwaukee, Wisc. Financial terms were not disclosed. Guidepost Growth Equity is the controlling shareholder of the combined entity. KPMG Corporate Finance served as exclusive financial advisor to Mammoth HR.

About ThinkHR

ThinkHR delivers trusted HR knowledge and people risk management solutions. Combining the best of human expertise with innovative cloud-based software, ThinkHR helps companies reduce risk, drive efficiencies and resolve people-related issues quickly and efficiently.

Founded in 2005, ThinkHR now serves more than 270,000 employers and 1,000 business partners — including top insurance, payroll, and HR technology providers — and is headquartered in Pleasanton, California. For more information, visit or connect via LinkedIn or Twitter.

About Mammoth HR

Founded in 2001, Mammoth HR, a technology-enabled HR services company, serves more than 85,000 employers and 700 business partners nationwide. Through its practice of Collaborative HR, the company partners with employers nationwide to rapidly solve their HR issues, build their capabilities, protect their organizations, and transform their workplaces. Mammoth has been recognized as one of the country’s top workplaces by Fortune and Entrepreneur. For more information, visit or connect on LinkedIn or Twitter.