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Protos Security Announces the Strategic Acquisition of Mulligan Security

Security Services Holdings, LLC (dba Protos Security) announced that it has acquired Mulligan Security, which serves some of the largest corporations in New York City and the Northeast. Mulligan’s founder and senior leadership team will remain in their existing roles post-close.

Nathaniel Shaw
Nathaniel Shaw

“Mulligan Security is an iconic trade brand in the security services industry. This acquisition greatly accelerates the growth of our self-perform direct guard capabilities,” said Nathaniel Shaw, Protos Security CEO. “With an impressive roster of blue-chip customers across many industries, the addition of Mulligan further diversifies Protos and makes us an attractive security services partner to customers such as real estate firms, schools, and corporate institutions. Kevin Mulligan and his talented team are a great fit with our service-first culture.” Protos is a portfolio company of Southfield Capital.

Kevin Mulligan
Kevin Mulligan

“I’m thrilled to partner with Protos and Southfield Capital to ensure the continuation of the Mulligan service commitment and growth track record. We look forward to working with Nathaniel and the Protos team to further tech-enable our business and continue to delight customers as we have for decades,” said Kevin Mulligan, Founder and President of Mulligan Security. “I know that our leadership position as the premier security services and fire and life safety provider in NYC and the Tri-state area will only expand in partnership with Protos.”

- Digital Partner -

Andy Cook, Partner at Southfield Capital, stated, “We have been working to expand the self-perform direct guard and fire safety capabilities for the Protos platform since our investment almost two years ago. The combination creates a formidable national player, establishing us as one of the largest security firms in the country, and reinforces our commitment to our clients to provide greater program flexibility and intelligence and high-quality services driven by our technology platform and breadth of experience.”

By continuing to invest in its management team, technology, and service capabilities, Protos is more aggressively positioned in the security marketplace. Protos’ mission is to provide differentiated, best total-value security solutions that deliver world-class service to our customers. For more information on customized solutions to protect your business, please visit

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