Determining the "best" 3D modeling company can be subjective and depend on various factors such as the industry, specific needs, budget, and personal preferences. There are several well-known and reputable 3D modeling companies that excel in different areas. Here are a few notable ones as of my last knowledge update in September 2021:

1. Autodesk
Autodesk is one of the leading companies in the field of 3D modeling and computer-aided design (CAD) software. Their products like AutoCAD, Maya, and 3ds Max are widely used in industries such as architecture, engineering, entertainment, and manufacturing.

2. Blender Foundation
Blender is an open-source 3D creation suite that has gained a lot of popularity due to its robust features and free availability. It's used for a wide range of purposes, including animation, visual effects, and game development.

3. Pixar
While not a traditional 3D modeling company, Pixar is renowned for its expertise in computer-generated animation and 3D graphics. They've created some of the most beloved animated films using their in-house software.

4. Dassault Systèmes
Dassault Systèmes offers software solutions like CATIA, SOLIDWORKS, and DELMIA for various industries, including aerospace, automotive, and manufacturing. They are particularly strong in engineering and industrial design.

5. SideFX
SideFX is known for its software Houdini, which is widely used in the film and game industry for creating complex visual effects and procedural modeling.

6. Foundry
Foundry provides tools like Modo, Mari, and Nuke, which are used for 3D modeling, texture painting, and visual effects in the entertainment industry.

7. Unity Technologies
Unity is a popular game development platform that includes 3D modeling and animation capabilities. It's widely used by game developers for creating interactive experiences.

8. Maxon
Maxon develops Cinema 4D, a 3D modeling, animation, and rendering software that's favored by motion graphics professionals and designers.

Remember that the "best" company can vary based on your specific needs. Some companies might excel in certain industries or niches, while others might be more accessible due to pricing or user-friendliness. It's a good idea to research and evaluate the features, compatibility, and reputation of each company's software to determine which one aligns best with your requirements.