frank-masciopinto/no-kings

No Kings is a browser extension for Chrome, Brave, and Edge that tells you who owns the website you are currently looking at. For the domain in your active tab, it identifies the parent company, how much combined stake the three largest index fund managers, Vanguard, BlackRock, and State Street, hold in it, and who actually holds voting control when that control belongs to a founder, family, or dual class share structure instead of those big three. The extension works mostly offline, using a built in static dataset of around 40 tracked companies for instant results. If a domain is not in that dataset, it falls back to looking up the parent company chain through Wikidata, which needs no API key. Users can optionally add a Financial Modeling Prep API key to pull live institutional ownership percentages instead of the static, rounded figures. A toolbar badge shows the combined Big Three percentage, color coded into bands: heavily held at 15 percent or more, partly held between 8 and 15 percent, lightly held under 8 percent, a separate marker for private companies where the ownership claim does not apply, and a grey marker for domains not in the database at all. There is also an optional desktop notification when a site crosses a chosen threshold. To install it, you clone or download the repository, open the browser's extensions page, turn on developer mode, and load the folder as an unpacked extension. No account or sign in is required, and the README states that data stays local unless the user chooses to enable live lookups with their own API key. The README is upfront that the static percentages are rounded and not live filings, that index fund ownership is mostly ordinary, since it represents millions of pension and retirement account holders rather than a single owner, and that many companies flagged this way are still actually controlled by founders or families through dual class stock. The project is released under the MIT license.