Страхователь заявил о страховом случае.

Страхователь is the person or organization that takes out the insurance policy — the policyholder / insured party in many contexts.

Страховщик is the insurer, the insurance company or provider.

So in this sentence, страхователь is the one who reports the insured event, not the company.

Because it is the subject of the sentence — the person who performed the action.

The verb is заявил, so the sentence answers the question Who stated/reported?
Answer: страхователь.

That is why it appears in the nominative singular.

In the past tense, Russian verbs agree in gender and number with the subject.

• заявил = masculine singular
• заявила = feminine singular
• заявило = neuter singular
• заявили = plural

Since страхователь is a masculine noun, the verb appears as заявил.

Even if the real person could be female, the grammatical form follows the noun страхователь, which is grammatically masculine.

The dictionary form is заявить.

This is a perfective verb, meaning it presents the action as completed: the person filed / reported / declared it.

Its imperfective partner is usually заявлять.

So:

• заявить = to report / declare once, as a completed act
• заявлять = to be reporting / to report habitually / repeatedly / in process

In this sentence, the perfective form fits because it refers to a completed report.

The verb заявить often takes the preposition о when it means to report / declare something about a matter.

So you get the pattern:

• заявить о чём? = to report / declare about what?

That is why the sentence uses:

• о страховом случае

rather than an accusative object.

This is just a government pattern you need to learn with the verb.

After о, Russian normally uses the prepositional case when it means about / concerning.

So:

• случай → nominative
• о случае → prepositional

And the adjective must match the noun:

• страховой случай → nominative
• о страховом случае → prepositional

So both words change:

• страховой → страховом
• случай → случае

This is a fixed insurance term meaning something like an insured event or claim event — an event covered by the insurance policy.

It is not just any case or incident in everyday language. In insurance language, страховой случай is a technical phrase.

So learners should treat it almost as a set expression.

Because adjectives in Russian must agree with the noun in gender, number, and case.

Here:

• случай is masculine singular
• after о, it becomes prepositional singular: случае
• the adjective must match: страховом

So:

• nominative: страховой случай
• prepositional: о страховом случае

This is standard adjective agreement.

Yes. Russian word order is more flexible than English.

The neutral order here is:

• Страхователь заявил о страховом случае.

But other orders are possible, for example:

• О страховом случае заявил страхователь.
• Заявил о страховом случае страхователь.

These alternatives may shift the focus or emphasis, but the grammatical roles remain clear because the case forms and verb agreement help show who is doing what.

The version given is the most straightforward and neutral.

In this context, reported is usually the most natural English equivalent.

Although заявить can sometimes mean declare or state, in insurance language заявить о страховом случае usually means to report an insured event / file notice of a claim.

So the verb has a somewhat formal, administrative tone here.

Yes, that is possible, and it would mean something like the policyholder informed/reported about the insured event.

But заявить о страховом случае sounds more like a formal insurance or legal procedure — filing or officially reporting the event.

So both can work, but заявил is often more official and more typical in bureaucratic or insurance language.

You can tell from both the noun and the verb:

• страхователь is singular
• заявил is singular masculine past tense

If it were plural, you would have:

• страхователи заявили о страховом случае

So the verb helps confirm the number.

It is fairly formal and sounds like insurance, legal, or administrative language.

Words like страхователь and the phrase страховой случай are typical of official or professional contexts, not casual everyday conversation.

In more everyday speech, people might say something simpler depending on context, but this sentence is perfectly normal in documents, reports, or communications with an insurer.