Bag Check

See who's talking their book: labels posts on X with the poster's disclosed financial ties.

Ever notice an investor praising a startup without mentioning they sit on its board? Bag Check puts the stake on the post. When someone posts on X about a company they have a publicly reported financial stake in (a board seat, an investment they led, an angel check, a founder or employee role), Bag Check hangs a bag on the post that says what it is: SITS ON FACTORY'S BOARD. • Every stake has a source. Click the bag: each stake is listed with its year and a link to the public record behind it (company announcements, SEC filings, firm portfolio pages, news). • Names and the news. A post that names a company is matched in your browser. A reply about the day's news that never names the company can be tagged too, and the bag says "re: the news". • No stake found, no bag. Public records miss angel checks, SPVs and fund positions, so a post without a bag doesn't tell you anything either way. • A tag shows a publicly reported stake and its source. It isn't a claim about why someone posted. • Something wrong? "Dispute this tag" is inside every bag's details: pick what's wrong, add a note, send. An upheld dispute pulls the stake from every copy of Bag Check within minutes. • Request a bag check. The toolbar button's "Request Bag Check" turns the X page into selection mode: select a post to queue its author, search by name or @handle, add a note, and send. "Give Feedback" goes straight to the maintainer. • A red ring marks the profile photos of people Bag Check covers. On their profile, it opens everything on file. • More than 650 investors and founders and more than 30,000 sourced stakes, kept current between releases. What leaves your browser Matching happens in your browser. For some posts by people Bag Check covers (a company name that is also an ordinary word, or a reply to recent news), the post's text goes to Bag Check's server for a yes-or-no check by a classification model. Nothing about you goes with it. The extension also downloads a public update file, counts installs with a random ID (browser and version, nothing else), and sends what you choose to send: requests, disputes and feedback, with the name and email you give, if you give them. No ads, no tracking, nothing sold. The privacy policy has the details. Bag Check is in beta. It works on x.com in Chrome on a computer.