Henry Schein

A Schedule 13G is filed by holders above 5% who say they will not try to influence the company. Index funds and large asset managers file most of them.

An amended Schedule 13D: the activist holder's stake changed by at least half a point.

A Schedule 13D means the holder owns more than 5% and keeps the option to push for changes: board seats, a sale, buybacks. It must be filed within 5 business days.

The holder reported owning less than 5%, which ends its duty to keep reporting this stake.