Manufacturers. Finding out would take anywhere from a few days to a few years depending on how much money you have.
The Sporting Arms and Ammunition Manufacturers Institute (SAAMI), sets voluntary national standards for ammunition and firearm design
those manufacturing small arms ammunition are classified in SIC 3482: Small Arms Ammunition
NAICS Code(s) 332992 (Small Arms Ammunition Manufacturing)
No exact number. About 39% of the small arms ammo in the world is made in the US. Annual production of the world is about 14 BILLION rounds of ammunition.
Most of the ammunition made by manufacturers in this industry is sold to private consumers: 44 percent in 1992, up from 40 percent of industry sales in the 1980s.
There are many manufacturers that are members of SAMMI (Sporting Arms and Ammunition Manufactures Institute) including Glock, Hornady, Nosler, and Savage Arms.
800,000,000
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those manufacturing small arms are classified in SIC 3484: Small Arms.
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