As of  January 2022, Oman has been actively working on diversifying its economy, and manufacturing is a significant sector. Here are some of the top manufacturing businesses in Oman:

1. Petrochemicals and Chemicals:

   • Oman is known for its petrochemical industry, producing chemicals and plastics.

2. Steel and Metal Products:

   • Steel manufacturing and the production of metal products are prominent in Oman.

3. Construction Materials:

   • Manufacturing of construction materials, including cement and building products, is a key industry.

4. Food and Beverage Processing:

   • Oman has a growing food and beverage processing sector, including dairy and food products.

5. Automotive Assembly:

   • Automotive assembly and manufacturing of parts contribute to the manufacturing landscape.

6. Textiles and Apparel:

   • The textile and apparel industry is developing, with the production of garments and fabrics.

7. Plastics and Packaging:

   • Manufacturing of plastic products and packaging materials is a significant sector.

8. Pharmaceuticals:

   • Oman has pharmaceutical manufacturing facilities producing medicines and healthcare products.

9. Electronics and Electrical Equipment:

   • Production of electronic components and electrical equipment is part of Oman's manufacturing sector.

10. Furniture and Wood Products:

    • Manufacturing of furniture and wood products contributes to the economy.

It's important to note that the economic landscape can change, and new industries may emerge over time. Additionally, the success of manufacturing businesses may depend on factors such as market demand, innovation, and government initiatives. For the most current and detailed information, it's advisable to refer to recent industry reports and updates specific to Oman's manufacturing sector.