Due Diligence Services

EY-Parthenon provides financial, tax, commercial, operational, human resources, AI, IT, product and technology, sustainability, cyber, and transaction tax due diligence to help you make informed choices with confidence. Our insights uncover hidden value, highlight risks, and support long-term strategies—enabling you to move forward with clarity, strengthen decision-making, and drive sustainable growth.


What EY-Parthenon Due Diligence can do for you

Our Due Diligence Services provide a complete view of the factors that drive value, identify risks, and support confident decision-making. Explore our full range of services—financial, commercial, operational, human resources, artificial intelligence (AI), IT, product and technology, sustainability, cyber, and transaction tax—to see how each area contributes to stronger strategies, better deal structures, and sustainable growth. Click on each service to learn how our integrated, data-driven approach delivers actionable insights and helps you make informed decisions with clarity and confidence.


#1 Global M&A Accountant Advisor — EY-Parthenon, H1 2025

Mergermarket’s latest for top M&A transaction advisor by both deal value and volume globally, and across key markets including Australia, France, Germany, Singapore, UK and USA.

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Our latest thinking

M&A outlook: stronger US deal market in 2026 despite mixed economic signals

The EY-Parthenon Deal Barometer, informed by our US economic outlook, predicts robust US deal volume growth through 2026.

How an M&A clean room strategy can accelerate transactions synergies

Discover how an M&A clean room strategy enhances transaction synergies, ensuring compliance, security, and faster integration.

Strategies for successful corporate separations

Gain competitive advantage with valuable insights from 160+ corporate separations, including spin offs, carve outs, optimal timing, and value maximization.