OSB Group

What OSB Group does

OSB Group PLC is a UK-listed specialist bank (LSE: OSB) that originates Buy-to-Let (BTL) and other specialist mortgage products and funds them primarily through retail deposits. The group operates through multiple brands — including Precise Mortgages, Kent Reliance for Intermediaries, Charter Savings Bank, Kent Reliance, InterBay Commercial, InterBay Asset Finance, Heritable Development Finance, and Rely — and distributes predominantly via UK mortgage intermediaries. As of recent reporting, OSB holds £25.9bn of net loans against £24.3bn of retail deposits, with a £17.7bn BTL book representing 68% of total lending and approximately 24% UK specialist BTL market share.

The group runs a hybrid technology and human-underwriting model. Its newly launched Rely broker platform (November 2025) introduces AI-assisted underwriting, reportedly reducing processing times by around 30% and onboarding over 4,500 brokers and 2,500 applications within weeks of launch. OSB employs 2,489 staff across the UK and India, with 1,008 based at OSB India (OSBI), which provides scaled technology, operations, and analytics capability. Revenue is generated primarily through net interest income on the loan book, supplemented by origination, servicing, and asset finance fees; H1 2025 net income of £142.1m and 2026 profit guidance of at least £300m frame the earnings profile.

The business model rests on deep broker relationships, multi-brand customer acquisition across both lending and savings, and capital-efficient specialist underwriting. Capital strength is a central strategic asset: CET1 ratio of 15.7-15.8%, Moody's Baa2 with stable outlook, and Bank of England transfer firm status effective 1 January 2026 (enabling exit from MREL requirements). The group has announced a £100m share buyback (March 2026) and £150m AT1 issuance (November 2025), marking a transition to active capital return under incoming CEO Enrique Alvarez Labiano (from Santander UK), who succeeds retiring CEO Andy Golding on 31 August 2026.

Name

OSB Group

Legal name

OSB GROUP PLC

Website

https://osb.co.uk

Company type

Public

Founded year

1840

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

OSB Group PLC is a UK-listed specialist bank originating Buy-to-Let and complex mortgages via intermediaries under brands including Precise Mortgages, Charter Savings Bank, Kent Reliance and Rely, funding a £25.9bn loan book with £24.3bn of retail deposits and holding approximately 24% of the UK specialist BTL market.

Ownership category

akta.pro rank

Product category

Specialist Mortgage Lending

SIC

Savings Institutions, Not Federally Chartered (6036), Mortgage Bankers & Loan Correspondents (6162)

akta.pro primary industry

Mortgage-Backed Securities (RMBS/CMBS) (FSACACAB)

akta.pro secondary industry

Structured Credit (ABS/MBS/CLO/CDO) (FSAHAGAC)

Keywords

• Specialist mortgage lending
• Buy-to-let mortgages
• Retail savings products
• Commercial property finance
• Development finance

Headquarters

HQ city

Gillingham

HQ country

United Kingdom

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Net Interest Income: Interest income from mortgage lending minus interest paid on retail deposits. The company operates as a specialist mortgage lender with net loans to customers of £25.9bn and retail deposits of £24.3bn.
2. Mortgage Lending Fees: Fees from mortgage origination and processing across specialist lending products including buy-to-let, residential, commercial, development finance, and bridging.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

OSB Group is a UK specialist bank that provides Buy-to-Let, specialist residential, commercial, semi-commercial, bridging, and property development mortgages alongside retail savings products. The Group operates a platform-plus-brands architecture serving underserved mortgage market segments through specialist intermediary brands (Rely, Precise Mortgages, Kent Reliance for Intermediaries, InterBay Commercial, InterBay Asset Finance, Heritable) and retail savings brands (Kent Reliance, Charter Savings Bank).

Product overview

OSB Group is a UK-listed specialist bank operating a platform-plus-brands architecture. The Group provides specialist mortgage lending and retail savings products through a family of distinct specialist brands: Rely (buy-to-let mortgage platform with AI-powered technology), Precise Mortgages (specialist residential and buy-to-let), Kent Reliance for Intermediaries, InterBay Commercial (commercial and semi-commercial lending), InterBay Asset Finance (SME equipment financing), Heritable Development Finance (property development lending), Charter Savings Bank (retail savings), and Kent Reliance (branch-based savings). The Group is primarily funded through retail deposits from Charter Savings Bank and Kent Reliance franchises. Operations are supported by OSB India, the wholly-owned offshore subsidiary. The Group focuses on underserved mortgage market segments including professional Buy-to-Let, bespoke residential, commercial, semi-commercial, development finance, bridging and asset finance.

Differentiator

Problem solved

Functional benefit

Brands

• Rely Mortgages: Buy-to-let lending platform for property investors and brokers, underpinned by new mortgage technology platform offering speed, clarity and insight
• Precise Mortgages
• Kent Reliance for Intermediaries
• InterBay Commercial
• InterBay Asset Finance
• Heritable Development Finance
• Charter Savings Bank
• Kent Reliance
• OSB India

Products and services

• Rely Mortgages Buy-to-let lending platform for property investors and their brokers, underpinned by a new AI-powered mortgage technology platform offering speed, clarity and insight through a data-led approach to underwriting.
• Precise Mortgages Specialist lender providing buy-to-let, residential mortgages and bridging finance for customers underserved by mainstream lenders, including self-employed borrowers and those with adverse credit.
• Kent Reliance for Intermediaries Specialist lending brand offering buy-to-let mortgages for personal ownership and limited companies, residential mortgages for non-standard income, large loan requirements and shared ownership via intermediary brokers.
• InterBay Commercial Expert provider of bespoke commercial, semi-commercial, buy-to-let loans, bridging and developer exit finance solutions for brokers handling challenging cases.
• InterBay Asset Finance Hire purchase, leasing and refinancing for UK SMEs and small corporate entities to fund business-critical assets.
• Heritable Development Finance Bespoke development funding for new build houses and flats, conversions and refurbishments including mixed use opportunities for experienced property developers and small to medium-sized housebuilders.
• Charter Savings Bank Retail savings bank offering UK customers online and postal savings accounts, Cash ISAs and bonds with competitive interest rates; recipient of ISA Provider of the Year and Best Fixed Rate Savings Provider awards.
• Kent Reliance Traditional UK savings bank operating since the 1840s with a network of branches in Kent, offering postal and online accounts supported by a dedicated call centre.

Quantifiable outcome

• 30% faster application-to-offer times via Rely platform
• +6 more outcomes

Named customers4 records

Segments6 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature3 records

Partnerships

Five partnerships are on record, tiered minor.

• Simplybiz MortgagesminorChannel Partner/ Reseller/ Distributor · 26 January 2026Launch of Specialist Property Finance Panel providing members access to range of lenders offering bridging, development finance, specialist buy-to-let, and commercial lending products.
• FIBA (Financial Intermediary & Broker Association)minorChannel Partner/ Reseller/ Distributor · 26 January 2026Joint launch of Specialist Property Finance Panel expanding broker access to specialist lending products.
• UN Global CompactminorStrategic or Co-development PartnerOSB Group became signatory in 2023, demonstrating commitment to sustainability and upholding principles related to human rights, labour, environment, and anti-corruption.
• Net Zero Banking AllianceminorStrategic or Co-development PartnerOSB Group was a member since 2023; the initiative ceased operations in October 2025 following exit of large financial institutions.
• Living Wage FoundationminorOthersOSB Group is an accredited Living Wage employer ensuring all UK employees and regularly contracted third party staff earn at least the published Real Living Wage.

Scale indicators13 records

Recent moves9 records

Expansion highlights6 records

Direct peers

• Paragon Banking Group: UK-listed specialist Buy-to-Let mortgage lender with very similar specialist franchise structure, including complex BTL, commercial and development finance products. Paragon is the closest direct competitor to OSB in the specialist BTL segment.
• Shawbrook Bank: UK specialist challenger bank focused on Buy-to-Let, commercial and SME lending. Directly comparable to OSB's specialist mortgage and SME asset finance franchise via InterBay and Heritable.
• Aldermore Bank: UK specialist challenger bank offering specialist mortgages, BTL and SME asset finance. Closely comparable to OSB's specialist mortgage and asset finance business model.
• Skipton Building Society: One of the UK's largest building societies with significant Buy-to-Let and specialist mortgage activity. Comparable to OSB as a UK specialist lender-saver with multi-segment mortgage focus.
• Leeds Building Society: UK building society with material specialist Buy-to-Let and complex residential mortgage activity. Directly comparable to OSB's specialist lending model and retail savings franchise.

Broad incumbents

• Coventry Building Society: Large UK building society with established specialist mortgage and savings franchises. Comparable as a UK retail-deposit-funded mortgage lender with specialist product capability.
• Metro Bank: UK challenger bank offering retail savings and mortgage products. Comparable as a deposit-funded UK challenger, though with broader consumer banking rather than specialist mortgage focus.
• Nationwide Building Society: UK's largest building society and dominant retail savings franchise. Comparable as a major UK mortgage and savings provider, though much broader and less specialist than OSB Group.

Regional players

• Principality Building Society: Welsh-focused building society with specialist mortgage and savings products. Comparable in specialist lending approach but primarily serves a different UK regional geography than OSB.

Emerging players

• Atom Bank: UK digital challenger bank with specialist mortgage focus. Comparable as an emerging specialist lender using technology-led underwriting, though smaller and earlier-stage than OSB Group.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/onesavings-bank-plc

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries5 records

Funding overview

Funding rounds2 records

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about OSB Group