EY-Parthenon

EY-Parthenon is one of Ernst & Young's four global service lines and following a major expansion in 2025 is the 'transformative strategy and transactions' consulting arm of the firm. The expansion of the brand in 2025 globally saw EY-Parthenon become a 25,000+ strong proposition across 120+ countries. It now positions itself as an advisor to CEOs, Boards, Private Equity, and Governments on strategy, M&A, divestitures, corporate finance, value creation, turnaround, and optimization, along with sector-specific strategic advisory and transformation services.

The firm was established as The Parthenon Group LLC in 1991 by former Bain & Company directors William "Bill" Achtmeyer and John C. Rutherford. In 2014 The Parthenon Group merged with professional services firm EY forming the new entity EY-Parthenon. The move was viewed as part of the continued efforts by the Big Four to move up the value chain from their traditional audit services into more lucrative areas of business, as well as to provide new points of entry to clients.

The firm advises top management (C-Suite) on strategic issues across a broad range of industries including Private Equity, Consumer Products, Education, Financial Services, Healthcare, Government, Infrastructure, Entertainment & Media, Advanced Manufacturing, Life Sciences, Oil & Gas and Technology. The firm competes with strategy consultancies such as McKinsey, Bain and BCG as well as the strategy consulting arms of the other Big Four firms such as Monitor Deloitte and Strategy&. and is consistently placed near the top of strategy consulting rankings with its branding centred around 'solutions that work in practice, not just on paper'.