Protos Security Divests Mulligan Security to Allied Universal

Technology & Services

Protos Security, a portfolio company of Southfield Capital, divestiture of Mulligan Security to Allied Universal


Summary

Protos Security, a portfolio company of Southfield Capital, announces the successful divestiture of Mulligan Security to Allied Universal. Terms of the transaction were not disclosed.

Baird served as lead financial advisor to Protos Security on this transaction.

About

Protos Security promises a modern security experience that never settles and dynamically adapts when, where and how it’s needed. By vetting, training and orchestrating thousands of local owner/operator security suppliers, plus the largest off-duty law enforcement network, Protos Security delivers scalable protection in any situation. Protos Security’s proprietary platform puts improved staffing, vetting, training, visibility, accountability and flexibility at your fingertips, including custom reporting and actual-time billing. From the C-team to the field team, Protos Security is committed to hassle-free and always-accountable customer experience across all four of our security service lines: guarding, off-duty, specialized and remote. Protos Security is headquartered in Norwalk, Connecticut.

Southfield Capital is a prominent private equity firm focused on leveraged buyout and growth capital investments in lower middle market business services companies. Established in 2002, Southfield leverages its extensive experience and disciplined investment strategy to partner with entrepreneurs and scale their businesses through organic and acquisition growth. The firm has successfully invested in over 60 companies, aiming to institutionalize and expand them. Southfield Capital is headquartered in Greenwich, Connecticut.

For more than 30 years, Mulligan Security has provided security and fire safety services to clients in and around New York City. Its clients range from commercial properties and corporate facilities to hospitals and museums. Mulligan is headquartered in New York, New York.

Allied Universal is the world’s leading security and facility services provider and trusted partner to more than 400 of the FORTUNE 500. Allied Universal delivers unparalleled customer relationships, innovative solutions, cutting-edge smart technologies and tailored services that enable clients to focus on their core businesses. With operations in over 100 countries, Allied Universal is the third-largest private employer in North America and seventh in the world with annual revenue of approximately $22 billion. There is no greater purpose and responsibility than serving and helping to safeguard customers, communities and people. Allied Universal is headquartered in Santa Ana, California.
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Technology & Services

Protos Security, a portfolio company of Southfield Capital, divestiture of Mulligan Security to Allied Universal

Date
August 2025
Company
Protos Security
Transaction
M&A - Sellside
Sectors
Technology & Services
Verticals
Facility, Industrial, Residential & Environmental Services
Target Geography
North America
Acquiror Geography
North America

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