Sentry Doors (Cairngorm Capital portfolio) Acquires E. & S. W. Knowles

Cairngorm Capital Acquires Sentry Doors Holdings

February 22, 2019

Building Products

Cairngorm Capital Partners’ Fund II has acquired Sentry Doors Holdings Limited, a Doncaster-based manufacturer of timber fire and security door-sets. The deal enables founder succession as Gordon and Carolyn Yates step back, and provides capital to expand manufacturing capacity and broaden geographic distribution to meet rising regulatory-driven demand.

Sentry Interactive Acquires Doordeck

June 1, 2022

Cloud & SaaS

Sentry Interactive, an Austin-based provider of digital detection and access management platforms, acquired Doordeck, a London-headquartered developer of cloud-based access control and mobile credentialing technology. The deal brings Doordeck's software-first mobile credential solution into Sentry's product portfolio to accelerate mobile access adoption, simplify installations amid supply-chain constraints, and support US market expansion.

Acorn Capital Completes Single-Asset Continuation Fund for Sentry Aerospares

June 11, 2025

Aerospace & Defense

Acorn Capital Management closed a single-asset continuation fund for Sentry Aerospares, co-led by Kline Hill Partners and LSV Advisors, providing liquidity to existing investors and extending Acorn's partnership with Sentry's management and founders. The new vehicle secures additional capital to support Sentry's global growth plans, including inventory expansion, technology upgrades, and potential acquisitions to strengthen its aftermarket supply chain and AOG capabilities.

ASSA ABLOY Acquires Sunray Engineering Group Ltd

July 26, 2023

Building Products

ASSA ABLOY has acquired Sunray Engineering Group Ltd, a UK designer and manufacturer of high‑specification steel and timber security doors, fire doors and louvre systems. Sunray, founded in 1980 and headquartered in Kent with about 70 employees and ~£12m in 2022 sales, will strengthen ASSA ABLOY's door specification offering and presence in the UK and EMEIA markets.

KENDELL Acquires Watson Security Group

January 15, 2021

Building Products

KENDELL, a Keystone Capital portfolio company and leader in commercial door and door hardware distribution, has acquired Watson Security Group, a Seattle-based provider of electronic access control integration and mechanical security services. The add-on expands KENDELL's aftermarket service capabilities, strengthens its Pacific Northwest footprint, and enables the platform to offer more full-lifecycle door opening and security solutions to commercial clients.

Rubicon Partners Acquires O&S Doors Limited

October 1, 2023

Building Products

Rubicon Partners has acquired 100% of the share capital of O&S Doors Limited (OS Doors) from an affiliate of Sun European Partners. OS Doors, headquartered in Dungannon, Northern Ireland, is a UK & Ireland leader in kitchen, bedroom and bathroom frontal doors and employs around 350 people; Rubicon will work with existing management to further develop the business.