Press releases scraped from the company's investor-relations website, newest first; for a company whose IR site has no news feed, the press releases it furnished as exhibits to its 8-K filings (coverage.status sec-filings). Coverage is partial — the coverage block states whether the company's IR page has been discovered and scraped, so an empty page is interpretable.

How far the IR-website pipeline has gotten for the company, so an empty feed is interpretable: a coverage gap is not evidence the company publishes nothing.

What happened to a requested ticker that no longer trades. "delisted": the company has no current US listing, so the answer is its history. "renamed": the company now trades as successorTicker, its current US presentation ticker (possibly another share class). A listed series (short volume, short interest, off-exchange volume, fails-to-deliver, congressional trades) is the retired ticker's own; a company-level read is the company's data.