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Publicly traded companies have ticker symbols, which act as a unique identifier on the exchange they are traded on. You can search databases using a company's ticker symbol narrowing your results to exactly the company you are looking for.
Look up ticker symbols: NASDAQ Symbol Lookup
Don't forget to look for information on the company's website. You can often find information that can be useful including news releases, SEC filings and annual reports (for public companies), corporate governance, and strategy by studying the website.
To find financial information and SEC filings for public companies look for a link to "Investor Relations."
NAICS is the North American Industry Classification System, a standard implemented in 1997 for classifying industry, product, and establishment. Use this site to find your industry NAICS code. Click on the relevant code to read its description and to ensure that you have the right code.
Different sectors of industry are classified according to NAICS (North American Industry Classification System) codes.
NAICS codes are hierarchical
The codes are 6 digits long, but you can use just part of the code in order to search a broader group of industries. For instance, "Confectionery Manufacturing from Purchased Chocolate" has the code 311330, but the shorter 3113 works for all of the different industries that fall under "Sugar and Confectionery Product Manufacturing". If you're searching using an NAICS code and you're not finding much, try lopping a digit or two off of the end of the full 6-digit code and you may have better luck.