AggregatorHost.exe

Windows ProcessMicrosoft Corporation

Also called aggregatorhost, aggregator host

WindowsSystem Component

Windows Aggregator Host. Current Windows uses it as a system host for aggregated input or capability work. It is not SearchIndexer.exe.

What you need to know

This is a Windows aggregator host, not the search indexer and not svchost.exe.

AggregatorHost.exe is a System32 host Microsoft added for aggregated system work. Treat a System32 copy as Windows. Do not apply svchost grouping tips to it.

Safe?: Yes, in System32
Is it Search?: No. SearchIndexer writes the catalog
Should I end it?: A hosted feature may fail

Feex says

If AggregatorHost is the unknown name, I check System32 and the publisher. I do not end SearchIndexer because of it.

What is AggregatorHost.exe?

AggregatorHost.exe is Windows Aggregator Host. It is a dedicated host image, not a service DLL inside svchost.exe.

What does it do?

It aggregates work Microsoft did not put in explorer.exe or SearchIndexer.exe. High CPU should be read with Process Explorer stacks, not with a filename risk score.

Why is it running?

The session or a feature started the host. A copy from anywhere but System32 is the path check.

Is it safe?

Usually safe

System32 AggregatorHost.exe signed by Microsoft is the host. The same filename in Downloads is not Windows and should not be run.

A legitimate copy normally runs from:

C:\Windows\System32\AggregatorHost.exe

Not SearchIndexer.exe
Not svchost.exe
Path first

Can I end it?

Only if stuck and the desktop is fine

Ending AggregatorHost.exe restarts that hosted work. It is not SearchIndexer.exe and it is not a weekly svchost cleanup.

Can I remove it?

Do not delete AggregatorHost.exe. It is a System32 host. Repair with SFC after you confirm corruption, not with a download.

Should it start with Windows?

Windows starts it as needed. Not a vendor tray.

Normal resource behavior

These are contextual labels, not universal averages.

CPU: Usually low
Memory: Small
Disk: Low
Network: Depends on the hosted feature

File information

AggregatorHost.exe file information
Executable name	AggregatorHost.exe
Common legitimate path	C:\Windows\System32\AggregatorHost.exe
Publisher	Microsoft Corporation
Signature expectation	Signed by Microsoft Windows

Common problems

Filename mills invent a risk percent

There is no public risk score from the name. Path and publisher are the evidence.

High CPU with no stacks

Process Explorer on this image. Do not disable WSearch as a first guess.

Troubleshooting

Diagnose before you change anything destructive.

Open file location

System32 is the expected answer.

Do not download a replacement

System file.

Technical details

AggregatorHost.exe technical details
Image name	AggregatorHost.exe
Role	Windows aggregator host

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. How we research.

Microsoft Learn: Windows · Primary Windows documentation
Microsoft Support: Windows · Public support naming
Foxhole process map · First-party samples on Windows PCs. Not a lab benchmark.

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