How tech hiring changed over a window, where hiring is postings opened and closed (and their net), never the change in openings listed: that change also holds re-counting (Boards found or dropped, duplicates removed, HeadStart's own counting changes), and the answer says how much of it turnover and sized steps explain and how much HeadStart could not size. Report the opened/closed net as hiring, but where the answer says most of a company's opened was found, not newly posted, say that instead; never call the change in openings listed hiring. Whole index by default, or one job category, or up to 10 named companies. A company is a directory company: a key such as 'greenhouse:stripe', or its exact name (read as the site's Trends picker reads it). Tell the user which directory company each name was read as, with its key and Boards: it can hold fewer Boards than a search_jobs company match on the same name. Opened and closed are counted from 2026-09-25 and company counts from 2026-09-13; the answer says when a window starts later than asked or turnover covers only part of it. coverage comparable holds the Boards tracked at the window's start fixed. measure new reads postings first seen in the trailing 7 days instead of openings.