Britain’s three largest digital banks published full-year figures within days of one another, and all three reported their best year so far. The shared label of challenger bank has flattened the differences between them for the best part of a decade. The accounts for the year to March 2026 finally set out how far each has travelled, and how differently each now earns its money.

Monzo has appointed Morgan Stanley and is reported to be working towards a valuation of £6bn to £7bn, with no prospectus or price range published as of mid-2026. Starling has delivered a fifth consecutive profitable year with a substantial capital surplus behind it, and has previously described London as its natural listing venue. Revolut reached a $75bn valuation through private markets and has indicated a preference for Nasdaq when it eventually lists.

The opportunity for investors sits in the differences. One business earns like a lender, one like a primary current account provider, and one like a global platform. Public markets price each of these models on separate frameworks, which gives anyone following the sector three distinct routes into it instead of one crowded trade.

Three business models, three opportunities

Starling offers the profile investors recognise most readily. It lends, funds that lending with customer deposits, and converts a substantial share of revenue into pre-tax profit. Its economics track the Bank of England base rate, which makes the business immediately legible to anyone who already covers the listed UK banks.

Monzo has built a primary current account franchise with unusual depth. Revenue per active personal customer reached £167 in the year, against £66 at Revolut, a gap that reflects how much of a customer’s financial life sits inside the app. Revolut earns predominantly from fees across a far larger base with lending kept deliberately light, placing it closer to the global payments and platform cohort.

Each model attracts a different valuation framework, and the distinctions are well established. Balance sheet lenders are typically priced against tangible book value, fee platforms against revenue growth and margin, and contracted software revenue against forward multiples that neither of the other models commands. Three businesses spanning all three frameworks is a genuinely useful set for a portfolio.

Monzo builds depth into every relationship

Monzo reported revenue of £1,712.3m for the year to 31 March 2026, up 39%, with gross profit passing £1bn for the first time. Statutory pre-tax profit reached £87.3m, up 44%, or £172.6m once an FCA fine and restructuring charges are excluded, against £143.9m on the same basis a year earlier. It marked a third consecutive profitable year.

The customer base reached 15.2m following the largest annual intake in the company’s history, with more than three million accounts opened during the period, most of them still arriving through word of mouth. Deposits climbed 55% to £25.7bn. Four separate income streams each cleared £300m, covering current account balances, borrowing, payments and wealth, up from a single stream a year earlier, and business banking now accounts for 14% of group revenue. The cost-to-income ratio moved to 74% from 70% as the bank accelerated hiring across product, technology and financial crime, investment aimed squarely at the next phase of growth.

The year brought decisive structural work alongside the trading performance. A full banking licence arrived from the ECB and the Central Bank of Ireland in early 2026, opening the European market, and the acquisition of digital mortgage broker Habito completed on 1 April 2026, giving the bank a capital-efficient route into broker-led mortgages with more than 550,000 customers already tracking a mortgage through the app. Monzo concentrated its investment on the UK and Europe by closing its United States operation in April 2026, a decision affecting around 50 roles. Diana Layfield became chief executive in February 2026 after TS Anil stepped down.

Starling holds its margin and builds a platform

Starling produced £217m of statutory pre-tax profit on £887m of revenue, a pre-tax margin of 24.5%. Revenue of £887m came against £940m a year earlier as the base rate fell by an average of 91 basis points, taking interest income to £759.2m, and profit held within 3% of the prior year across that falling rate cycle. Delivering an almost flat result through a rate reduction of that scale demonstrates real durability in the underlying franchise.

The franchise strengthened across every operational measure. Customer accounts rose from 5.3m to 6.2m, transaction volumes reached £216.7bn from £197.1bn, and the average deposit balance per customer increased 7.9% to £4,241. More than half of Starling’s SME customers and 32.5% of its retail customers now treat the bank as their main account, and a capital surplus of £525m sits above the regulatory minimum, giving management the freedom to act on its own timetable.

The most compelling line in the accounts is one of the smallest. Engine, the banking-as-a-service arm launched in 2022, generated £10.9m of revenue, up 25%, and now carries around £70m of committed annual recurring revenue across four live clients in five countries. A single partnership with Tangerine, a Scotiabank subsidiary, will migrate more than two million accounts onto the platform over the coming decade. Contracted software revenue is valued on an entirely separate basis to net interest income, which gives Starling an equity story with two independent growth engines and a £20m group investment behind the newer one.

Revolut scales across 39 countries

Revolut’s $75bn valuation was set through a secondary share sale, up 66% from $45bn a little over a year earlier, with participation from Coatue, Greenoaks, Dragoneer, Fidelity, Andreessen Horowitz, Franklin Templeton, T. Rowe Price and NVentures, NVIDIA’s venture arm. The company serves more than 70m customers across 39 countries and secured full banking authorisations in Mexico and Colombia during the period. Chief executive Nik Storonsky has set out an ambition of 100m customers and 30 new markets by 2030, with India and Mexico among the nearer additions.

Breadth is the model, and it is working. Fee income across a very large base produces a lower figure per customer while delivering scale that neither UK peer can match, and the arrival of NVIDIA’s venture arm on the shareholder register deepens an existing technology partnership covering artificial intelligence, customer service and fraud detection. A Nasdaq listing would place the business alongside the payment networks and global fintech platforms valued on exactly that logic.

What the market gets to price

Monzo’s reported target of £6bn to £7bn works out at roughly 3.5 to 4 times revenue, or around 35 to 40 times adjusted pre-tax profit, well above the single-digit earnings multiples applied to the listed UK banks. The revenue mix gives the market solid grounds for applying a technology framework instead of a banking one, and the disclosure is unusually generous for a private company, with per-customer revenue, stream-by-stream income and cost ratios all published for investors to test.

London stands to gain considerably from the sequencing. Monzo’s process is furthest advanced with Morgan Stanley engaged, Starling has both the margin profile and the capital to move when it chooses, and the Treasury has introduced a three-year stamp duty exemption for newly listed companies to improve the arithmetic for candidates weighing their options. Revolut has separately committed $4bn of investment into the UK as part of a $13bn global programme through to 2030 and opened a new Canary Wharf headquarters in late 2025, keeping the sector’s centre of gravity firmly in the capital whichever exchange it eventually chooses.