Castle Trust Bank Acquired by Sixth Street and Bayview
Ethan Cole
Editorial · Sep 23, 2026
Editorial Calendar World-Region-Country Castle Trust Bank Acquired by Sixth Street and Bayview Castle Trust Bank chief executiveMartin Bischoffwill remain in post, and the wider management team is expected to continue in place. As part of the transaction, Sixth Street and Bayview have committed additional capital to support growth, though the release did not disclose the deal price, the size of the new capital commitment, or a timeline for deployment. The release includes the clearest set of financial disclosures.
Castle Trust Bank has accumulated retail savings balances exceeding £1.6 billion, a specialist property finance loan book of more than £1.1 billion, and a retail finance book through itsOmni Capital Retail Financesubsidiary that surpasses £200 million. That gives the business roughly £2.9 billion in combined deposit and lending exposure across three product lines: Cash ISA and savings accounts, specialist bridging and term mortgages, and point-of-sale retail finance. Bayview brings approximately $44.7 billion in assets under management with a focus on residential, commercial and consumer credit, including mortgage servicing rights and asset-backed securities.
Sixth Street manages more than $135 billion in assets under management and committed capital. Both acquirers describe an appetite for asset-based finance with a long-term horizon, which aligns with Castle Trust Bank’s book-built model rather than a higher-velocity fintech scaling play. Masashi Washida, managing director for asset-based finance at Sixth Street, said the bank’s leadership and its technology platform “create a strong foundation for sustainable growth and scalable operations at an attractive time in the market.” The acquisition sits inside a broader pattern of institutional credit managers acquiring or recapitalising mid-sized UK specialist lenders.
Rising interest rates over the prior cycle improved net interest margins at savings-funded institutions but also tightened affordability in the specialist mortgage market. With the rate cycle now turning, acquirers with long-duration capital are positioning to
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