"Big4"

#13344363

19 February 2026

An illustrative stock graph displayed on a laptop screen and PWC logo displayed on phone screen are seen in this multiple exposure illustration photo taken in Krakow, Poland on February 19, 2026.

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#13344364

19 February 2026

An illustrative stock graph displayed on a laptop screen and KPMG logo displayed on phone screen are seen in this multiple exposure illustration photo taken in Krakow, Poland on February 19, 2026.

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#13344365

19 February 2026

An illustrative stock graph displayed on a laptop screen and EY logo displayed on phone screen are seen in this multiple exposure illustration photo taken in Krakow, Poland on February 19, 2026.

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#13344366

19 February 2026

An illustrative stock graph displayed on a laptop screen and Deloitte logo displayed on phone screen are seen in this multiple exposure illustration photo taken in Krakow, Poland on February 19, 2026.

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#13344362

19 February 2026

Deloitte, PWC, KMPG and EY logo displayed on a phone screen and an illustrative stock graph displayed on a laptop screen are seen in this multiple exposure illustration photo taken in Krakow, Poland on February 19, 2026.

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#12929127

31 October 2025

The PwC (PricewaterhouseCoopers) logo is illuminated on the exterior of an office building at night in Munich, Bavaria, Germany, on October 30, 2025. PwC is one of the Big Four multinational professional services networks, providing assurance, tax, and consulting services globally.

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#12929128

31 October 2025

The PwC (PricewaterhouseCoopers) logo is illuminated on the exterior of an office building at night in Munich, Bavaria, Germany, on October 30, 2025. PwC is one of the Big Four multinational professional services networks, providing assurance, tax, and consulting services globally.

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#10552830

26 September 2023

CALGARY, CANADA - September 18, 2023 : Second day of the 24th World Petroleum Congress at the Big 4 Building at the BMO Center, Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552832

26 September 2023

CALGARY, CANADA - September 18, 2023 : Delegues with AR Smart Glasses at the Saudi exposition, on the second day of the 24th World Petroleum Congress at the Big 4 Building at Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552826

26 September 2023

CALGARY, CANADA - September 18, 2023 : Second day of the 24th World Petroleum Congress at the Big 4 Building at the BMO Center, Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552828

26 September 2023

CALGARY, CANADA - September 18, 2023 : Second day of the 24th World Petroleum Congress at the Big 4 Building at the BMO Center, Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552804

26 September 2023

CALGARY, CANADA - September 18, 2023 : Logo of Sinopec, a Chinese oil and gas enterprise based in Beijing, seen on the second day of the 24th World Petroleum Congress at the Big 4 Building at Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552810

26 September 2023

CALGARY, CANADA - September 18, 2023 : Suncor exposition seen on the second day of the 24th World Petroleum Congress at the Big 4 Building at Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552806

26 September 2023

CALGARY, CANADA - September 18, 2023 : Logo of CNPC, the China National Petroleum Corporation, a major national oil and gas corporation of China, seen on the second day of the 24th World Petroleum Congress at the Big 4 Building at Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552808

26 September 2023

CALGARY, CANADA - September 18, 2023 : Logo of Tourmaline Oil, a Canadian energy company engaged in the exploration, development, and extraction of crude oil and natural gas, seen on the second day of the 24th World Petroleum Congress at the Big 4 Building at Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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#10552792

26 September 2023

CALGARY, CANADA - September 18, 2023 : Matthew Opoku Prempeh, Ghana's Minister of Energy, seen on the second day of the 24th World Petroleum Congress at the Big 4 Building at Stampede Park, on September 18, 2023, in Calgary, Canada. Over 5,000 delegates from 100+ countries have gathered in Calgary for the 24th World Petroleum Congress, where global oil and gas leaders convene under the theme 'Energy Transition: The Path to Net Zero.' The conference focuses on decarbonization efforts, taking into account the region's challenges, including record-breaking temperatures and wildfire haze.

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