There are many machine tool manufacturers around the world, and the top manufacturers can vary depending on the source and the criteria used to rank them. However, some of the largest and most well-known machine tool manufacturers include:

1. Mazak: A Japanese company that manufactures a wide range of machine tools, including CNC lathes, milling machines, and multitasking machines.
2. DMG Mori: A global manufacturer of machine tools, based in Japan and Germany, known for their high-end CNC machine tools and automation solutions.
3. Okuma: A Japanese company that manufactures CNC lathes, grinders, and milling machines.
4. Haas Automation: An American company that manufactures CNC machine tools, including lathes, mills, and turning centers.
5. Doosan: A South Korean company that manufactures a wide range of machine tools, including CNC lathes, machining centers, and grinding machines.
6. Fanuc: A Japanese company that manufactures CNC systems, robotics, and machine tools, including CNC lathes, milling machines, and machining centers.
7. Amada: A Japanese company that specializes in manufacturing metal fabrication machinery and software, including punch press, laser cutting machines and automation systems.
8. Hurco: An American company that specializes in CNC machine tools including vertical mills, lathes, and 5-axis machines.
9. Makino: A Japanese company that manufactures a wide range of machine tools including vertical machining centers, horizontal machining centers, and EDM machines.
10. JTEKT: A Japanese company that manufactures bearings, automotive steering systems, and machine tools including CNC lathes and machining centers.

This is not an extensive list and is not in any order of ranking and it can vary depending on location, product line, and market scenario. These manufacturers also have different ranges of products and focus on different market segments.