LLR Partners-backed 3SI Security Systems, an advanced security solutions provider, completed the merger with Wren Solutions, a retail asset protection company. Financial terms were not disclosed. “3SI and Wren are both long-time security industry leaders with similar cultures focused on people, innovation and collaborative customer partnerships. We are excited to extend our complementary market-leading technologies to our respective customers, enhancing their ability to protect their assets and their people,” Todd Leggett, 3SI CEO.