This is the 326th most frequent Icelandic word.
fyrirtækjum
"Companies" or "businesses."
The word 'fyrirtækjum' here refers to 'companies' and is in the dative plural form because of the verb 'gengið', which takes a dative object.
Fyrirtækjum í landinu hefur gengið vel að auka framleiðslu.
Companies in the country have succeeded in increasing production.
The word 'fyrirtækjum' is dative plural as it complements the preposition 'fyrir', which governs the dative case in this usage.
Við hönnuðum nýja lausnir fyrir fyrirtækjum.
We designed new solutions for companies.
The word 'fyrirtækjum' is in the dative plural to agree with the governing structure of the sentence, potentially due to omitted or implied structures.