The WIG20 brings together 20 of the largest and most liquid companies listed on the Warsaw Stock Exchange’s Main Market. Its constituents include major banks, energy groups, retailers and manufacturers, providing a view of who audits some of the most prominent businesses on the Polish exchange.
The table reflects the WIG20 constituent and auditor snapshot for September 2026, with the latest fee research completed on 8 October 2026. Big4News has identified the external auditor, the first financial year of the current engagement and a disclosed fee for all 20 companies.
The results show a concentrated market with an unusual distribution of mandates: PwC leads comfortably, Deloitte is absent, and Grant Thornton audits two constituents. Recent starting dates are common, but those recent engagements are all held by Big Four firms.
Fees are shown in Polish złoty (PLN) and relate to FY2025. The Notes column identifies differences in reporting periods, fee scope and currency conversion, including amounts that combine audit and review services.
Click the column headings to sort the table by company, sector, auditor, the first financial year of the engagement or audit fee.
WIG20 audit market share
PwC holds nearly half the WIG20 audit appointments
PwC audits nine WIG20 companies, giving it a 45% share of appointments—equal to KPMG and EY combined. KPMG holds five mandates, EY four and Grant Thornton two. Deloitte has none.
This gives the WIG20 a distinctive audit-market structure. The Big Four account for 90% of appointments, but that share is divided among just three networks. Grant Thornton completes the field through its engagements at LPP and CD Projekt.
Financial services anchor PwC’s position
Five of PwC’s nine clients are financial companies: Bank Pekao, PZU, Erste Bank Polska, Alior Bank and Kruk. KPMG audits the remaining two financial constituents, PKO Bank Polski and mBank.
PwC’s lead therefore rests heavily on financial services. EY’s portfolio has a different composition: three retail groups—Żabka, Pepco and Modivo—and manufacturer Grupa Kęty. KPMG combines banking with energy, utilities and food retail through ORLEN, PGE and Dino Polska.
Recent engagements remain concentrated in the Big Four
Twelve of the 20 current audit relationships began in FY2024 or FY2025. PwC holds six of these engagements, KPMG four and EY two.
The recent appointments have strengthened the three largest networks’ presence in the index. Grant Thornton’s two engagements are older, dating to FY2018 at CD Projekt and FY2022 at LPP.
Pepco and ORLEN account for the largest recorded fees
Pepco has the largest recorded fee in the WIG20 dataset at PLN 24.9 million, followed by ORLEN at PLN 18.6 million. Erste Bank Polska ranks third at PLN 7.2 million.
The two figures have different reporting scopes. Pepco’s FY2025 annual report discloses EUR 5.840 million in audit fees, including discontinued operations. Converted at EUR/PLN 4.2676, this produces the PLN 24.9 million figure shown in the table. ORLEN’s amount combines PLN 12.5 million in separately identified audit fees with a PLN 6.1 million category covering audits and reviews.
At the lower end, CD Projekt records PLN 150,000, Budimex PLN 256,000 and PGE PLN 550,000. Modivo’s PLN 3.3 million figure includes both audit and review services for the parent/group and subsidiaries.
About the data
This dataset covers the 20 companies in the September 2026 WIG20 snapshot, with the latest fee research completed on 8 October 2026. Auditor identities, first financial years and fee figures are recorded for every company.
The research draws on annual reports, audited financial statements, auditor reports and appointment announcements. Read Who Audits? Sources & Methodology for details of how Big4News identifies auditors, establishes tenure and treats fee disclosures.
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