Capstone Partners advised Key Container Corporation—a premier, family-owned corrugator and converter of corrugated boxes and other packaging products—on its investment from Altamont Capital Partners. The transaction closed in March 2025, and terms of the deal were not disclosed.
Key Container was founded in 1959 and has grown through four generations of family ownership and management. Operating three facilities across Rhode Island and Massachusetts, Key Container serves entrepreneurial, fast-growing small- to medium-sized businesses across New England with high-quality, cost-effective corrugated packaging produced in-house. For more information on Key Container, visit here.
[Capstone Partners] took the time to grasp the nuances of our packaging business and presented our company with clarity. They guided us with professionalism and discipline throughout. Their insight, expertise and attention to detail led to an exceptional result.
The investment will enable Key Container to expand its corrugated operations while strengthening customer relationships and growing its regional presence.
Altamont is a private investment firm that manages over $4 billion of capital and is headquartered in Palo Alto, California, with additional offices in San Francisco and Austin, Texas. The firm makes long‑term investments in sectors where it has deep experience and specialized knowledge, partnering with management teams to execute proven, repeatable platform‑building strategies. For more information on Altamont Capital Partners, visit here.
The investment banking professionals on Capstone Partners’ dedicated Industrials Team work with leading middle market companies operating in the packaging market to advise with their strategic decision-making in order to maximize financial outcomes at every stage of the business lifecycle. Our firm has developed a full suite of corporate finance solutions, including M&A advisory, debt advisory, financial advisory, and equity capital financing, to help privately owned businesses and private equity firms address any need, ranging from growth and financial or operational advisement to an ultimate exit transaction. To learn more about this transaction, or about the benefits of starting a relationship with our Industrials Banking Team, contact us here.
