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Beneficial Ownership (13D/13G) — New

Comprehensive beneficial ownership API with normalized multi-table data model. Supports multi-filer group filings, purpose classification, amendment tracking with threshold crossing detection, and unified holder identity linking across Form 4, 13F, and 13D/G. Response fields include: cusip (array), nameOfIssuer, titleOfSecurities, eventDate, secFilingUrl, entities (array from SGML index with name/cik/irsNo/sic), groupMembers (array for group filings), signatures, applicableRule (13G), footnotes. Filer objects include: entityType (entity/individual), citizenship, principalOccupation, employerName, legalProceedingsDisclosureRequired (boolean), per-filer footnotes. Position objects include: sourceOfFunds (array), typeOfReportingPerson (array), amountOfFunds, amountExcludesCertainShares, indirectOwnershipExplanation, sharesAcquirable60Days.