Alexander Vriesendorp

Core Laboratories NV engages in the provision of proprietary and patented reservoir description, production enhancement, and reservoir management services to the oil and gas industry. It operates through the Reservoir Description segment and Production Enhancement segment. The Reservoir Description segment encompasses the characterization of petroleum reservoir rock, fluid, and gas samples and provides analytical and field services to characterize properties of crude oil and petroleum products. The Production Enhancement segment provides products and services relating to reservoir well completions, perforations, stimulations, and production. The company was founded in 1936 and is headquartered in Amsterdam, the Netherlands.

Frank's International NV engages in the provision of tubular services to oil and gas industries. It operates through the following four segments: Tubular Running Services, Tubulars and Cementing Equipment. The Tubular Running Services segment provides tubular services in international offshore markets and in several onshore international regions. The Tubulars segment designs, manufactures, and distributes large outside diameter (OD) pipe, connectors, casing attachments and sells large OD pipe originally manufactured by various pipe mills. The Cementing Equipment segment provides equipment to enhance the safety and efficiency of rig operations. The company was founded by Frank Mosing in 1938 and is headquartered in Den Helder, Netherlands.

Nienhuis Montessori BV develops, publishes, and provides learning materials. It offers curriculum support materials, including printed labels, control charts & maps, and language materials. The company was founded by Albert Nienhuis in 1929 is headquartered in Zelhem, the Netherlands

SAS Gouda BV designs and supplies offshore winch systems. The company was founded in 1896 and is headquartered in Gouda, the Netherlands.

Shamrock Partners BV is an independent private equity investment firm located in Maarssen, The Netherlands. The firm was founded in 1991 to manage a group of investment holding firms known as Vreedenlust.