Public company's disclose (some, not all!) financial information in SEC filings and annual reports.
Public companies in the U.S. disclose (some, not all!) information about their finances and operations in the form of SEC filings. The 10-K/Q have the most detail about a company's finances; you won't find a more specific breakdown elsewhere.
These databases specialize in tracking small, private, startup companies.
News is often one of the only sources of information on private companies.
The "Press Release" page on a private company's website, discoverable through Google, is also a critically important resource for private company news.
Imagine that you are an executive at a private company. What information (financial or otherwise) would you share, if it meant your competitors may use it for their own benefit?
Companies do not voluntarily share info about themselves, unless:
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