Enhetsregisteret viser organisasjonsnummeret for enkeltpersonforetaket.

Because Enhetsregisteret is being used as a proper name: the name of a specific official register in Norway.

In Norwegian, common nouns are not capitalized, but names of institutions, registers, companies, and similar entities are. So:

• et enhetsregister = a register of entities / a unit register
• Enhetsregisteret = the Enhetsregisteret, the specific register being referred to

So the capital letter tells you this is not just any register, but a particular one.

In Norwegian, the is usually attached to the end of the noun instead of standing as a separate word in front.

So:

• et organisasjonsnummer = an organisation number
• organisasjonsnummeret = the organisation number

And similarly:

• et enkeltpersonforetak = a sole proprietorship
• enkeltpersonforetaket = the sole proprietorship

This is one of the biggest differences from English. English says the number; Norwegian usually says number-the.

The ending -et is the usual singular definite ending for many neuter nouns.

In this sentence:

• Enhetsregisteret
• organisasjonsnummeret
• enkeltpersonforetaket

all behave as neuter nouns in the definite singular.

A useful pattern is:

• et
  • noun = indefinite singular
• noun + -et = definite singular

For example:

• et nummer = a number
• nummeret = the number

So -et here does not mean the same thing in every word by accident; it is a regular grammar pattern.

The dictionary form is the indefinite singular form. For the main nouns here, that would be:

• et enhetsregister
• et organisasjonsnummer
• et enkeltpersonforetak

Then the sentence uses the definite singular forms:

• Enhetsregisteret
• organisasjonsnummeret
• enkeltpersonforetaket

This is helpful because when you look words up in a dictionary, you usually search for the indefinite form, not the definite one.

Because Norwegian, like German, very often forms compound nouns by writing the parts together as a single word.

So:

• organisasjon
  • nummer → organisasjonsnummer
• enkeltperson
  • foretak → enkeltpersonforetak

English often writes similar ideas as separate words, but Norwegian usually prefers one compound word.

This is very important for learners, because writing them as separate words can look unnatural or even be wrong in Norwegian.

That -s- is a linking element often used in Norwegian compounds.

So the word is built like this:

• organisasjon
• organisasjons-
• nummer
• organisasjonsnummer

It does not have a separate meaning by itself here. It mainly helps connect the parts smoothly.

You will see this a lot in Norwegian compound words, for example:

• arbeidsdag = workday
• barnebok = children’s book
• organisasjonsnummer = organisation number

Unfortunately, there is not always a simple rule for when a linking -s- appears, so it often has to be learned word by word.

Here for means something like for or belonging to / associated with.

So organisasjonsnummeret for enkeltpersonforetaket means:

• the organisation number for the sole proprietorship
• the organisation number of the sole proprietorship

English might prefer of in some contexts, but Norwegian naturally uses for in many official or administrative phrases like this.

So this is not a word-for-word match with English usage; it is just the normal Norwegian preposition in this kind of expression.

Because Norwegian verbs are much simpler than English verbs in this respect: they do not change according to person or number.

So you get:

• jeg viser
• du viser
• han/hun viser
• vi viser
• de viser

The verb stays viser for all of them in the present tense.

That means in this sentence:

• Enhetsregisteret viser ... = The register shows ...

the form viser is just the normal present tense form of å vise.

This sentence has the basic Norwegian main-clause order:

subject + verb + object/prepositional phrase

• Enhetsregisteret = subject
• viser = verb
• organisasjonsnummeret = object
• for enkeltpersonforetaket = prepositional phrase

So it is a very straightforward sentence.

A useful thing to remember, though, is that Norwegian is a V2 language in main clauses. That means the verb usually comes in the second position. If you move another element to the front, the verb still stays second:

• Enhetsregisteret viser organisasjonsnummeret for enkeltpersonforetaket.
• I dag viser Enhetsregisteret organisasjonsnummeret for enkeltpersonforetaket.

So the sentence you were given is the normal, neutral word order.

Not if you mean a specific, identifiable number.

In this sentence, the definite form organisasjonsnummeret is natural because it refers to the organisation number of that specific business.

Compare:

• viser organisasjonsnummeret = shows the organisation number
• viser organisasjonsnummer = shows organisation number / shows an organisation number

The second version sounds less specific and is usually not what is meant here.

So the definite form is used because both the register and the sole proprietorship are specific, and the number connected to them is specific too.