CNC (computer numerical control) Horizontal machining center (HMC) machines are used to perform milling, drilling, tapping and other operations on metal and other materials. Here are ten manufacturers that are well-known for producing CNC Horizontal machining center:

1. DMG MORI
2. Makino
3. FANUC Corporation
4. Haas Automation
5. Doosan Machine Tools
6. Okuma Corporation
7. Mitsubishi Heavy Industries
8. Johnford
9. Hurco Companies, Inc
10. Kitamura Machinery Co., Ltd

This list is not exhaustive and in no particular order. It is based on market share, reputation and industry standards in specific countries and industries. Additionally, Depending on the specific type of CNC Horizontal machining center (ex: high-speed, heavy-duty, and so on) the ranking can vary and some of the manufacturers from CNC Vertical machining center list could be included here as well, as many of them produce both types of machines.