IT.NRW's categorisation of company size classes differentiates between the classes 0-9, 10-49, 50-249 and 250 or more employees. Overall, establishments with fewer than 250 employees account for 99.3 percent of all businesses in Bonn and these 15,279 businesses employ 90,311 people (or 53.9 percent of the total) who are subject to social security contributions. The other 110 large companies (previous year: 102) with 250 or more employees employ 77,223 people (46.1 percent) who are subject to social security contributions. An analysis of Bonn's business structures reveals a differentiated situation: micro-enterprises with up to 9 employees make up 84.9 percent of all establishments and account for 11.0 percent of employees. The group of small businesses with 10-49 employees accounts for 18.0 percent of employees and 11.5 percent of establishments, while medium-sized businesses with 50-249 employees account for 25.0 percent of employees and 2.8 percent of establishments. In the large companies with 250 or more employees, the proportion of employees subject to social security contributions in Bonn (46.1 percent) is very clearly above the figure for NRW as a whole (34.6 percent). However, a comparison with selected cities in the Rhineland shows that the number of employees registered in large companies there is comparable to that in Bonn: The share of employment in companies with more than 250 employees is 44.2 percent in the NRW state capital Düsseldorf, 45.3 percent in the neighbouring city of Cologne and 45.5 percent in Leverkusen.

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