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ISSUER//CIK 0000314643

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP

SIC 6189Asset-Backed Securitiesoperating

Exchange

Entity type

operating

Fiscal year end

Dec 31

Headquarters

DE

Research Summary

AI-assisted · Grounded in filings

Updated Nov 24, 2025

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP, CIK 314643, operates in the Asset-Backed Securities industry (SIC 6798) by pooling consumer-oriented mortgage receivables and issuing structured securities to fixed-income investors seeking diversified, yield-enhancing exposure; the firm’s core services center on securitizing residential loans originated by Washington Mutual, matching them with insurance wrap providers, servicing platforms, and rating agencies, then distributing tranches to institutional buyers such as pension funds and money market funds. The company navigates a tightly regulated landscape in which the SEC, federal banking regulators, and rating agencies scrutinize underwriting standards, disclosure practices, prepayment modeling, and collateral performance, while material risks stem from interest-rate volatility, borrower credit deterioration, and the complexity of cash flow waterfalls. The latest disclosure, a Form 8-K filed in August 1999, underscores the firm’s commitment to timely reporting of material events, so explore live SEC filings on Earnings Feed for the most current insights.