Each entry records what a company publishes about itself, on the date it was read. No company paid for its entry in the lists above; members appear in the “Featured suppliers” band at the top of the page in addition to their entry in the categories, which is unchanged and unmoved. Where a company publishes a figure about its own size, that figure is quoted as self-reported and linked to the page it came from.
Ownership in this industry changes constantly — distributors merge, manufacturers get acquired, brands get renamed. Where an entry knows about a change, it says so. Before you rely on a detail, follow the link and check it at the source.