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Local Company Research Resources

People search for information on local companies for a variety of reasons:

Researching small local companies can be a bit problematic, because there is less published about them than about large companies. Nevertheless, there are a number of resources you can check for information about local businesses of any size.


Annual Reports


If the local company that you are researching is publicly traded, it must issue annual reports. Annual Reports explain where you can find such reports in paper, microfilm, or online.

Local and State Business Directories


Most business directories include brief, essential information about companies, such as date established, number of employees, estimated sales, officers, and SIC codes. The Business, Science & Technology Center carries a number of local and regional business directories:

Regional Trade & Industry Directories


If a company is not listed in a general regional directory, it may be in a trade directory that focuses on a particular industry or service. The following regional trade and industry directories are at the Business Science & Technology information desk:

You will also find relevant sources in the U.S. Industry and Trade Collection.

Books of Lists


This annual issue lists top ranking local companies by industry or service. The library offers the Book of Lists for San Francisco, East Bay, San Jose & Silicon Valley, Sacramento, Los Angeles, and Sonoma/Marin. Ask for these lists at the Business, Science & Technology information desk.

Local Newspapers


Local or regional newspapers are an excellent source of company information. You can often search current issues of these newspapers on their Web sites:

Many of these newspapers are also indexed with full text of the articles in the library's online databases.

Company & Industry Directory Databases


The Library provides databases in the Business, Science & Technolgy Center and through SFPL Online. These databases can be searched by company name, location, industry, service or product line.

Government Databases


California business name searches can be conducted on the California Business Portal, maintained by the California Secretary of State. Search for names using the California Business Search, which also includes the Agent for Service of Process for all California Corporations and LLPs.

San Francisco business name searches can be conducted using the City and County of San Francisco's Online Services page. Search fictitious business names in the Business Name Search database.

Company Web Sites


Many companies, even small businesses, have Web sites. A company's home page is an excellent source of information about its history, current projects, products, services and officers. To find a company's Web site, enter the company name in a search engine.



Researching Older Local Companies

The San Francisco History Center files on local businesses - On the sixth floor of the Main Library, the San Francisco History Center has many special files with local business information as well as a number of monographs listing historical businesses and local business people.

Local newspapers are another good source of company information. The Magazine and Newspapers Center maintains a large collection of local newspapers and newspaper indexes and San Francisco Newspapers on Microfilm.

San Francisco City Directories and Phone books are also valuable resources. By scanning these directories year by year it is often easy to pinpoint when a company operated in a given location.

Business directories for public companies - You may be able to find basic information about older companies. See the 'Researching old stocks' section of our Stock Research page.

Business directories for private companies
[Note: None of the local sources listed below pre - date 1950]