/**
 * Ownership Changes Service - 13D/G Filings
 *
 * Tracks major ownership changes (5%+ stakes) and activist investor activity
 * from SEC Schedule 13D and 13G filings
 */
/**
 * Ownership change filing (13D or 13G)
 */
export interface OwnershipChangeFiling {
    formType: '13D' | '13D/A' | '13G' | '13G/A';
    filingDate: Date;
    reportingPerson: {
        name: string;
        cik: string;
        address?: string;
    };
    issuer: {
        name: string;
        ticker?: string;
        cik: string;
    };
    ownership: {
        percentOfClass: number;
        shares: number;
        votingPower?: number;
        dispositivePower?: number;
    };
    purpose?: string;
    isAmendment: boolean;
    documentUrl: string;
    accessionNumber: string;
}
/**
 * Ownership Changes Service
 */
export declare class OwnershipChangesService {
    private cache;
    private xmlParser;
    constructor();
    /**
     * Get recent 13D/G filings (market-wide)
     */
    getRecentOwnershipFilings(formType?: '13D' | '13G' | 'both', limit?: number): Promise<OwnershipChangeFiling[]>;
    /**
     * Get 13D/G filings for a specific company (by ticker or CIK)
     */
    getCompanyOwnershipFilings(symbolOrCik: string, limit?: number): Promise<OwnershipChangeFiling[]>;
    /**
     * Get activist investors (those filing 13D with acquisition purpose)
     */
    getActivistInvestors(limit?: number): Promise<Array<{
        investor: string;
        investorCik: string;
        targets: Array<{
            company: string;
            ticker?: string;
            percentOwned: number;
            purpose: string;
        }>;
    }>>;
    /**
     * Fetch filings by type from SEC RSS feed
     */
    private fetchFilingsByType;
    /**
     * Parse ownership filing entry from RSS feed
     */
    private parseOwnershipEntry;
    /**
     * Fetch and parse 13D/G XML document to extract ownership details
     */
    private fetchAndParseOwnershipDocument;
}
/**
 * Singleton instance
 */
export declare const ownershipChangesService: OwnershipChangesService;
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