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Mark O’Sullivan

Fractional CFO

Mark O’Sullivan is an experienced fractional executive, mentor, and senior advisor who specialises in supporting business owners, founders, and executive leadership teams through periods of significant change and challenge. With more than 25 years of experience across multiple industries, he brings deep expertise in both CFO and COO leadership roles. Mark is particularly skilled at guiding organisations through high-growth phases, market disruption, stagnation, and turnaround situations. Combining strategic insight with a hands-on approach, he is not afraid to roll up his sleeves and work alongside leadership teams to deliver practical results.
Mark O’Sullivan

Track record highlights

  • Led PE buyout for seller at 15 times multiple
  • Advised start-up funds business to a multi billion dollar business
  • Re-defined back office of private financial services firm
  • Onshored finance function
  • Founded operational and financial advisory business

Sector Experience

  • Banking-financial-services; PE, Investment management and alternatives
  • Construction
  • Healthcare; Aged care and child care business also

Mark's specialist skills

Banking Relationship

Managed global banking change

Leadership

Led teams of 70 plus

Outsourcing

Onshore and offshore

Exit Planning

Sold multiple businesses to PE

M&A Specialist

Deep involvement on both sides of transactions

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