On the various reputable websites (not ebay/ali), you can find several manufacturers of capacitors. Now we have lists of reputable capacitor companies from people who work a lot with electronics equipment, e.g.
But I've noticed a few more, and wanted to know what your experiences with these have been and/or if you know anything about these other brands:
(Pardon the length. They all have more than 200 offerings on reputable websites such as: mouser, digikey, and Avnet/Newark.)

Aillen
American Technical Ceramics
Amotech
Cal-Chip Electronics
Chinsan (Elite)
Frontier Electronics
Holy Stone Enterprise
ICM
Johanson (Dielectrics / Technology)
Knowles (Dielectric Labs / Novacap / Syfer)
Kyocera AVX
Meritek
Multicomp/Multicomp pro (Part of Avnet/Newark)
Murata
NTE Electronics
Samsung Electro-Mechanics
Stackpole Electronics
Surge
Taiyo Yuden
Tusonix / CTS
Venkel
Visaton
Walsin
Yageo

Thanks!

 

Don't shop by "price".
Shop by specifications.
I think that You will find that the Capacitors with the "most-expensive-specifications"
are only produced by the biggest names in that field,
or by manufactures that specialize in very "hi-grade" ( Mil-Spec ) parts.

First, You need to know what specifications are important to
your application, and why they are important.

There are tiny Capacitors that cost over ~$200.oo each for very demanding applications,
and, Capacitors that cost ~$20.oo per 1000-pieces.

The reputable suppliers are not going to stock any junk that doesn't meet advertised specifications,
but the purchaser is normally aware of the limitations of super-cheap parts.

The big suppliers are very cautious about maintaining their reputation.

I shop exclusively by specifications,
and it has held me in good stead for decades,
regardless of the manufacturer,
but I don't design anything for "Mass-Production".

Your mileage may vary.
.
.
.

 

Just to be clear, I never said any of these brands are cheap. IDK as I'm not willing to look at listings that are for poor quality caps anymore (Yeah, I learned from buying from China like so many others.).

 

Kyocera, Murata, NTE, Samsung, Stackpole, and Taiyo Yuden are all known to me as reputable manufacturers.

This shouldn’t be interpreted as a negative comment on any I didn’t name, I just don’t know enough about them.

 

Don't shop by "price".
Shop by specifications.
I think that You will find that the Capacitors with the "most-expensive-specifications"
are only produced by the biggest names in that field,
or by manufactures that specialize in very "hi-grade" ( Mil-Spec ) parts.

First, You need to know what specifications are important to
your application, and why they are important.

There are tiny Capacitors that cost over ~$200.oo each for very demanding applications,
and, Capacitors that cost ~$20.oo per 1000-pieces.

The reputable suppliers are not going to stock any junk that doesn't meet advertised specifications,
but the purchaser is normally aware of the limitations of super-cheap parts.

The big suppliers are very cautious about maintaining their reputation.

I shop exclusively by specifications,
and it has held me in good stead for decades,
regardless of the manufacturer,
but I don't design anything for "Mass-Production".

Your mileage may vary.
.
.
.

This is excellent advice. As an engineer I never worried about the component manufacturers. That job was assigned to different people with an entirely different focus. These included people from purchasing, manufacturing, and quality control. They had the time, equipment, and skills to not only identify the preferred manufacturers but also to test the parts to verify their specifications.

 

Most capacitors I seem to buy on Mouser come from Kyocera or Murata.

 

Today I usually buy AEC-Q200 Automotive Capacitors.
https://www.arrow.com/en/research-and-events/articles/capacitors-in-applications
https://static4.arrow.com/-/media/a...1&w=16 &hash=8E7A44BF0D2180D9C1497373B3019701

Commercial vs. Automotive Capacitors
The automotive standard for capacitors and other electronic components arose in the early 1990s as a response to the growth of the personal electronics sector. As electronic devices became more and more pervasive, components were in higher demand. In a surprising shift, automotive companies were no longer the primary buyers of electronic components.

As a result, manufacturers produced more and more components at varying levels of quality. A failure of a car’s electrical system can be a life-or-death affair,and the components endure harsh temperature conditions, weather, and other conditions. It is crucial that automotive components perform reliably no matter the circumstances.

Automotive Capacitors and the AEC-Q200 Standard
Eventually, the Automotive Electronics Council (AEC), an automotive industry organization, developed standards to ensure a category of components that met their safety and reliability requirements. Today, the standard that specifies automotive capacitors and other components is called AEC-Q200. This standard:

 

As an engineer I never worried about the component manufacturers. That job was assigned to different people with an entirely different focus.

Although I was in an entirely different field of engineering, I often had to walk down to purchasing to argue my case that I needed a very specific part by a certain manufacturer. If left up to purchasing, they bought a lot of low-cost generic items which for most industrial maintenance and construction is OK if you are buying conduit or THHN/THWN wire for instance. That is not always the case and giving very specific part specifications was often ignored to buy what they always bought from their good ole pal Joe the parts salesman that took them out for lunch every month.