Ownership changes for one issuer SINCE a cursor: Forms 3/4/5 (Section 16 officers, directors) and Schedules 13D/13G (5%+ holders), amendments included. Returns the FILING-level change and its document URL; share counts inside each Form 4 are NOT parsed and not claimed. Requires ?since=YYYY-MM-DD AND ?ticker= or ?cik=. Optional ?forms=4, ?limit=1..200. Errors: 400 missing_since|missing_issuer, 404 unknown_ticker, 502 edgar_unavailable. AN EMPTY DELTA IS CHARGED. 8-K: /edgar/events.

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