The two categories
Essential by operation of law are, among others, the entities in Annex 1 that exceed the threshold for medium-sized enterprises [1]. Important are entities in Annex 1 that are medium-sized, and entities in Annex 2 that are medium-sized or larger [2].
What is medium-sized?
The Cbw refers to the European SME definition. An SME has fewer than 250 employed persons and an annual turnover of at most 50 million euros or a balance sheet total of at most 43 million euros; a small enterprise has fewer than 50 employed persons and a turnover or balance sheet total of at most 10 million euros [3]. Medium-sized is an SME that is not a small or micro enterprise. Partner and linked enterprises count: linked enterprises in full, partner enterprises in proportion to the interest [5]. A small transport company in a group can therefore still be medium-sized.
Designation
Regardless of size, the minister can designate an entity from Annex 1 or 2 as an essential entity, for example if it is the only provider of an essential service in the Netherlands or if disruption could have significant consequences [4]. An entity designated as a critical entity under the Wet weerbaarheid kritieke entiteiten is an essential entity by operation of law, regardless of its size [6].
Why the difference matters
The duties (duty of care, reporting duty, registration, management body) are the same for both categories. The difference lies in supervision and the maximum fines.