Altamont Capital Partners, a California-based private equity firm, has made a growth investment in Key Container Corporation, a leading manufacturer of specialty and custom corrugated packaging products serving customers across the Northeast United States. Financial terms were not disclosed.

Founded in 1959 and headquartered in New England, Key Container has been a regional packaging leader for more than six decades, building a strong reputation for quality, reliability, and customer service across four generations of the founding Strauss family. The company provides specialty and custom corrugated box solutions to a broad customer base across the Northeast, combining manufacturing expertise with a customer-first service model.

Altamont's investment will support Key Container's continued growth and regional expansion, underpinned by the firm's experience in industrials and packaging and its platform-building approach. David Strauss will continue to lead the company as President.

TM Capital, a division of Capstone Partners – IMAP USA, acted as exclusive financial advisor to Key Container Corporation on the transaction.