each company; all companies
Used to refer to individual companies within a group or to all companies collectively, depending on context. Often appears in business or news contexts.
Each company's financial results were announced one after another.
Each company announced a new product.
この展示会には各社が新製品を出展した。
Various companies exhibited new products at this trade show.
Pricing differs from company to company.
The details of the service vary depending on the company.
各社 refers to each individual company, while 各国 (built the same way with 各) refers to each individual country, so learners can mix up which noun follows 各.
各社 means each company, whereas 各自 means each individual person, so despite the shared 各 prefix they refer to entirely different kinds of units.
各社 is built from the counter 社, which is used to count or refer to individual companies, as in A社・B社 or 3社.
Compound of 各 (each) and 社 (company).