atheryon / about

About Atheryon

Atheryon operates at the intersection of transactions, transformation, technology, data and AI. We help organisations understand complexity earlier, reduce execution risk and deliver outcomes with confidence.

§01 / Positioning

What Atheryon is

Atheryon is a specialist advisory firm helping organisations understand and execute complex transactions, transformations and technology-driven change where operational, technology and data dependencies materially impact outcomes.

We work with Boards, executive teams, investors, private equity sponsors and corporate development teams.

§02 / Our Story

Our story

Atheryon was founded on a simple observation: organisations rarely struggle because of strategy. They struggle because operational, technology and data complexity is discovered too late.

After decades leading major transactions, transformations and technology initiatives, Atheryon’s founders saw the same challenge emerge repeatedly. Critical decisions were often made before key operational, technology and data dependencies were fully understood, increasing execution risk and reducing value.

Atheryon was established to bring that understanding into the process earlier. We help clients identify complexity before decisions are locked in, navigate it during execution and deliver outcomes with confidence.

Whether the objective is a transaction, business transformation, technology modernisation or AI-enabled change, success depends on understanding what will be required before commitments are made. Success is measured not by plans approved or deals signed, but by value realised, capabilities delivered and outcomes achieved.

§03 / Co-Founders

Co-founders

Anna Contos, Co-Founder, M&A Transaction Services

Anna Contos

Co-Founder, M&A Transaction Services

I co-founded Atheryon and lead our M&A Transaction Services practice. With more than 25 years of experience across Australia, the UK and the US, I advise corporate and private equity clients on acquisitions, divestments, separations, integrations and business transformations that unlock enterprise value.

Having held senior executive leadership roles across banking, wealth and NBFIs, I bring first-hand experience leading complex transactions in highly regulated environments. My expertise spans transaction strategy, operating model design, carve-out and separation planning, integration execution, business readiness and post-deal stabilisation.

I work closely with boards, executive teams and deal sponsors to navigate critical transaction events, translating strategic intent into executable plans and ensuring value is realised through disciplined delivery. My approach combines commercial pragmatism, operational rigour and deep transformation experience to help clients manage risk, accelerate outcomes and achieve sustainable results.

At Atheryon, I help clients execute transactions with confidence, providing practical, outcomes-focused leadership from deal strategy through to separation, integration and value realisation.

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Terry Tsakiris, Co-Founder, Data, Transformation & AI

Terry Tsakiris

Co-Founder, Data, Transformation & AI

I co-founded Atheryon and lead our Data, Transformation & AI practice. With more than 25 years of experience spanning engineering, financial markets, data platforms and large-scale transformation, I help organisations modernise their data foundations, accelerate decision-making and unlock value through AI-enabled solutions.

My career has combined deep technical expertise with executive delivery leadership across global investment banks and major Australian financial institutions. I have led the design and delivery of mission-critical risk, market data, analytics and regulatory platforms in highly regulated environments, enabling organisations to improve performance, strengthen governance and manage risk at scale.

My experience includes delivering market-leading front-office risk, P&L attribution, market data and analytics platforms supporting Fixed Income, Equities, FX and Rates businesses globally. I have successfully recovered large-scale transformation programs, established high-performing data product organisations and built platforms supporting regulatory reporting, surveillance and enterprise decision-making.

At Atheryon, I work with executives and delivery teams to translate complex business challenges into practical technology outcomes. Combining expertise in data, engineering, AI and transformation, I help clients deliver measurable results while maintaining the governance, controls and operational discipline required in critical environments.

I remain closely involved in both solution design and delivery, ensuring emerging AI capabilities are applied responsibly within robust operational and regulatory frameworks.

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