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PKO Bank Polski (PKO) — moat facet

A bank with twelve and a half million customers has no customer concentration at all, and a state shareholder who is also a borrower, a regulator and a tax authority.

PKO's filings contain no customer-concentration disclosure of the kind an industrial company would publish, because with 12 460 thousand customers1 there is nothing to concentrate.

Customer concentration, by companynone materialPKO largest customer22%Nvidia largest20,4%Kioxia largest67%CoreWeave largest12,46 million retail depositors and no concentration disclosure at all
There is nothing to disclose. The concentration that does exist is in the shareholder, the regulator and the tax authority, which are the same party.

That is the ordinary position for a retail bank and it is worth stating precisely what it does and does not protect against. It means no single depositor's departure matters and no single borrower's default threatens the bank. It does not mean the exposures are independent: every one of those customers lives in Poland, earns złoty, and is affected by the same interest rate, the same labour market and the same government at the same moment.

The counterparties that do matter individually are on the other side of the business. PKO is the leading corporate lender in the country and handles the budgets of seven voivodeships2 — a customer relationship with the same institution that owns 29,43% of the bank3 and sets its tax rate.

And there is a category of customer unique to Polish banking: the borrower who sued. Swiss franc mortgage holders are customers whose contracts the courts have progressively found unenforceable, and who have cost PKO 4 365 million złoty in 2025 alone4. The bank now runs a settlement programme offering mediation through the Arbitration Court at the Polish Financial Supervision Authority5.

The scale of the aggregate is worth stating once. Deposits of 460 722 million złoty against financing of 315 953 million6 means PKO's customers have lent it about 145 billion more than it has lent them — a bank that is funded by its depositors rather than by markets, which is the single structural feature that most reliably separates institutions that survive credit cycles from those that do not.

So the four relationships here are four different things: millions of depositors who matter only in aggregate, a corporate book concentrated in large domestic and state-linked borrowers, the state as customer and shareholder at once, and the borrowers whose loans became a liability.

The measure is customer numbers against deposits. Both grew in 20257, which is the only aggregate signal a bank with no concentration disclosure can offer.

Moat trajectory: Holding steady

Twelve and a half million customers and no concentration to speak of. The composition is unchanged; what changed is the state's posture, and that is covered in the threats.

The number that tests this moat
Moat Explorer calc
Amounts due to customers per customer
About 37 800 złoty at June 2026 (475 762m zł across 12,6 million)

Twelve million small depositors, none material; the average balance rising says the franchise is deepening rather than just counting accounts.

How it's calculated: Amounts due to customers 475 762m zł / 12,6 million customers
Source: PKO Bank Polski S.A. Group Directors' Report for the six months ended 30 June 2026 ↗
Dig deeper
DIG DEEPER 01
Twelve Million Depositors, None That Matters
Not one of PKO's twelve and a half million customers could move the funding cost by leaving.
DIG DEEPER 02
The State Is a Customer Too
Seven voivodeship budgets, the state agencies and the Treasury bonds on the balance sheet — the largest shareholder is also a client.
DIG DEEPER 03
The Borrowers Who Took the Bank to Court
Tens of thousands of PKO's own mortgage customers are now its litigation counterparties.
DIG DEEPER 04
The Corporate Book Nobody Sees
Forty-nine corporate branches and twenty-four regional centres carry the lending that is never in the retail story.
References
  1. ReportedPKO's filings contain no customer-concentration disclosure of the kind an industrial company would publish, because with 12 460 thousand customers there is nothing to concentrate.
    PKO Bank Polski S.A. Group Directors' Report for 2025 - the customer base (12 460 thousand customers against 11 120 thousand five years earlier, 9 764 thousand current accounts, and more than 8,7 million active installations of the IKO mobile application) — FY2021-FY2025 · publ. 12 March 2026 · source ↗
  2. ReportedPKO is the leading corporate lender in the country and handles the budgets of seven voivodeships — a customer relationship with the same institution that owns 29,43% of the bank and sets its tax rate.
    PKO Bank Polski S.A. Group Directors' Report for 2025 - market position, distribution network and staff (PKO described as the largest commercial bank in Poland and the leading bank on its home market in terms of the scale of operations, with the most recognised brand among banks; 947 branches against 975, about 3 100 ATMs and 225 agencies, 26 252 employees against 25 657 and a seventh consecutive Top Employer certificate, the corporate network of 49 branches and 24 regional centres, seven voivodeship budgets, and the foreign branches and representative offices in Stockholm and Vilnius) — FY2025 · publ. 12 March 2026 · source ↗
  3. ReportedPKO is the leading corporate lender in the country and handles the budgets of seven voivodeships — a customer relationship with the same institution that owns 29,43% of the bank and sets its tax rate.
    PKO Bank Polski S.A. Group Directors' Report for 2025 - market position, distribution network and staff (PKO described as the largest commercial bank in Poland and the leading bank on its home market in terms of the scale of operations, with the most recognised brand among banks; 947 branches against 975, about 3 100 ATMs and 225 agencies, 26 252 employees against 25 657 and a seventh consecutive Top Employer certificate, the corporate network of 49 branches and 24 regional centres, seven voivodeship budgets, and the foreign branches and representative offices in Stockholm and Vilnius) — FY2025 · publ. 12 March 2026 · source ↗
  4. ReportedSwiss franc mortgage holders are customers whose contracts the courts have progressively found unenforceable, and who have cost PKO 4 365 million złoty in 2025 alone.
    PKO Bank Polski S.A. Group Directors' Report for 2025 - the cost of legal risk on mortgage loans in convertible currencies (4 365m złoty charged in 2025, 534m less than in 2024, and the settlement programme offering mediation through the Arbitration Court at the Polish Financial Supervision Authority) — FY2025 · publ. 12 March 2026 · source ↗
  5. ReportedThe bank now runs a settlement programme offering mediation through the Arbitration Court at the Polish Financial Supervision Authority.
    PKO Bank Polski S.A. Group Directors' Report for 2025 - the cost of legal risk on mortgage loans in convertible currencies (4 365m złoty charged in 2025, 534m less than in 2024, and the settlement programme offering mediation through the Arbitration Court at the Polish Financial Supervision Authority) — FY2025 · publ. 12 March 2026 · source ↗
  6. Moat Explorer calcDeposits of 460 722 million złoty against financing of 315 953 million means PKO's customers have lent it about 145 billion more than it has lent them — a bank that is funded by its depositors rather than by markets, which is the single...
    Moat Explorer calculation - arithmetic on figures PKO reports: the Swiss franc charge as a share of net profit (4 365 over 10 682), financing per employee (315 953 over 26 252 against 247 572 over 25 657), current accounts as a share of customers (9 764 over 12 460), deposits less financing (460 722 less 315 953), and the levy against fee income (1 349 over 5 243), credit losses excluding legal risk (5 859 less 4 365 = 1 494), the income mix (24 223 and 5 243 over 30 370 = 79,8% and 17,3%), net profit growth (10 682 against 9 304 = 14,8%), financing per employee (315 953 over 26 252 = 12,0m), and customers against Poland's population (12,46m of 37,33m) — FY2021-FY2025 · publ. September 2026 · source ↗
  7. ReportedBoth grew in 2025, which is the only aggregate signal a bank with no concentration disclosure can offer.
    PKO Bank Polski S.A. Group Directors' Report for 2025 - the five-year record 2021-2025 (net profit from 4 874m złoty to 10 682m, return on equity from 12,1% through a 9,6% trough to 19,5%, cost-to-income from 40,4% and a 45,0% peak to 31,1%, interest margin from 2,70% to 4,76%, total assets from 418 086m to 583 079m and the year-end stock exchange capitalisations) — FY2021-FY2025 · publ. 12 March 2026 · source ↗
Sources
Generated September 24, 2026