Why AI is primed to be a huge benefit — and a major liability — for consulting’s Big Four

KPMG offices.
KPMG is one of several consulting firms helping businesses make sense of tariffs.Liam McBurney/PA Images via Getty Images

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But first: AI meets the consulting giants.


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Company headquarters of EY, Deloitte, KPMG, PWC
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If you’ve read BI lately, you know AI is proving to be an asset and a risk for the consulting industry. Several months ago, we asked Polly Thompson in London to take on coverage of the the Big Four: Deloitte, PwC, EY, and KPMG. She immediately zoned in on this tech and how it is poised to help — and disrupt — these massive firms. I chatted with Polly to find out more.

Polly, how do you size up AI adoption inside the Big Four? Is it more hype and hope, or embrace and happening?

Big Four firms are resting their futures on AI and have poured billions into developing in-house solutions. Employees don’t have much choice but to embrace it — the messaging is to learn AI or get left behind — and their Fortune 500 clients will be following their lead. We’ll see how quickly their efforts generate returns.

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Tell us more about how AI is both an opportunity and, in some ways, an existential threat.

Consultants specialize in guiding companies through transformations, which means AI presents plenty of opportunities for the Big Four. They face a balancing act between meeting that demand and handling the massive upheaval that AI will bring to their operating models, leadership structures, and job roles.

What have you been learning about smaller consulting firms challenging the bigger rivals?

Midsize firms are in a sweet spot right now. Consultants increasingly are expected to become specialized and offer deep sector expertise — a demand many of these firms already fill. AI is also poised to help boost their productivity and widen their reach without the need to invest in a vast workforce. They see this as their opportune moment. That said, the midsize firms I’ve spoken to aren’t aiming to be the next Big Four.

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Published: June 2, 2025
Updated: June 2, 2025
Category: Information