Tri-Northern was formed by Brazos two years ago through the acquisition and merger of Tri-Ed Distribution and Northern Video System, and has bolted-on another three companies since.
Although details of the transaction were not disclosed, Tri-Northern is believed to have annual revenues of about $400m.
Brazos co-founder and co-CEO Randall Fojtasek said the firm was attracted to Tri-Northern because of its exceptional management team and combined market position in the growing and fragmented electronic security product market.
The firm made its investment in Tri-Northern from its $715m Brazos Equity Fund III.
Brazos manages about $1.4bn of equity capital and focuses on investments in leading mid-market commercial and industrial, consumer, healthcare and business service companies.
It has completed more than 60 acquisitions in the past decade, making it one of the busiest mid-market private equity investment firms.
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