Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Company is regular. It follows the -ies Conversion rule.
Use plural verbs: "The companies are ready" (not "is ready").
Yes. The plural companies is standard across all English variants.
The word company follows the standard English pluralization rule. When forming the plural, company becomes companies. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why company becomes companies helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using companies in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The companies are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.