Use Passport GMID.

• Click on Search, then Companies or Brands.

Also, try Corporate Affiliations.

• Scroll over Subscriber Tools and click Company Search, then choose Advanced Search.
• Then, select your Criterion as Product/Brand Name.

For new consumer packaged goods, use Mintel

• Navigate to Analytics in the top menu and select Products to access the Global New Products Database. Search for the brand or company by name.

Search Bloomberg (see access details).

• Enter a parent company's ticker symbol, then hit the yellow <EQUITY> key.
• Then, type RELS and hit the green <GO> key.

Also, look at Brands and their Companies -- as an e-book or in print, at call number T223.V4 A22 at the Lippincott Library Reference Desk.