Use when a US stock is moving and the likely cause is needed from primary sources: the last 48h (up to 168h) of SEC filings ranked as catalysts (8-K events in plain English, press-release headline, offerings and dilution, Form 4 insider trades, 13D/13G stakes) plus same-day trading halts, each with time and filing link. An answer status tells "nothing filed" apart from "a source failed". Facts only, no prices or opinions. Errors: 400 bad_input, 502 SEC unreachable. Failed calls are not charged.

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