Press brake is a sheet metal forming machine that uses a die and punch to bend sheet metal into specific shapes, the top manufacturers of press brake machines include:

1. AMADA: A Japanese company that manufactures a wide range of sheet metal fabrication machinery, including press brakes, laser cutting machines, and punching machines.
2. TRUMPF: A German company that produces a wide range of sheet metal fabrication machinery, including press brakes, laser cutting machines, and punching machines.
3. Bystronic: A Swiss company that produces a wide range of sheet metal fabrication machinery, including press brakes, laser cutting machines, and punching machines.
4. LVD: A Belgian company that produces a wide range of sheet metal fabrication machinery, including press brakes, laser cutting machines, and punching machines.
5. Murata Wiedemann: A German company that manufactures a wide range of press brakes and punching machines.
6. Ermak: A Turkish company that specializes in manufacturing press brakes and shears.
7. Durma: A Turkish company that specializes in manufacturing press brakes and shears.
8. HACO: A Belgian company that specializes in manufacturing press brakes, shears, and punching machines.
9. Jorns: A German company that specializes in manufacturing press brakes and shears.
10. ACE: An American company that specializes in manufacturing press brakes and shears.

This list is not exhaustive and the ranking may vary depending on location, product line, and market scenario. These manufacturers also have different ranges of products and focus on different market segments.