The brand became closely linked to the widespread adoption of the index card as a standard tool for business data management, reflecting its role in the evolution of information organization and retrieval systems throughout the 20th century.

It was roughly equal in revenues to Rand Ledger, and the two companies easily dominated the American office supply market.

The company's products were widely used in the health care field ("filling a kardex" became a common term for entering data into a patient's medical record), and demand in Europe was so strong that Rand soon built a factory in Germany.

[10] Miller established a separate company, Randex, also selling filing and storage system components, for operation in Europe.

Randex continued to exist as a separate company under Miller family control after Kardex Systems was sold to Remstar.

In 2020, Kardex acquired a stake in the start-up company Rocket Solution GmbH,[13] based in Unterhaching near Munich.

Remstar has a global presence with more than 30 subsidiaries and representative offices, offering customers comprehensive service and support in addition to its automated storage and retrieval systems.

Kardex Remstar has production facilities in Neuburg an der Kammel and Bellheim, Germany, and in West Columbia, South Carolina, USA.

Kardex Mlog develops, manufactures and maintains integrated material handling systems and automated high-bay warehouses.

The company acts as a general contractor and supplier of components and system solutions from its own production facilities in the fields of new installations, modernization and service.

These include storage and retrieval machines up to 45 meters high, conveyor technology and software solution.

AutoStore offers a space-saving and efficient storage and order-picking solution for small parts based on autonomous robots.

As a global partner, Kardex is involved in the distribution, planning and installation of AutoStore solutions worldwide.