Athens, Greece · Est. 2023
Family
Holding &
Advisory
Preserving and growing family assets across generations through deliberate ownership, strategic advisory, and select investments in transformative ventures.
Learn moreWho we are
Quiet
Authority
DeyenCo is a private holding and advisory company owned by Dimitris Maniatis, established to manage, develop, and protect the family's business interests over the long term.
The company operates across two complementary pillars: direct investment and control in high-conviction ventures, and personal advisory services delivered by its principal to select clients and organisations navigating complex transformation.
We are not a fund. We are not a consultancy. We are a principal-driven holding structure that brings both capital and expertise to bear — with patience, discipline, and a long horizon.
What we do
Areas of
Activity
01 — Holdings
Strategic
Ownership
DeyenCo holds equity stakes in carefully selected ventures where the principal brings more than capital — contributing operational oversight, network access, and strategic direction to ensure long-term value creation.
Principal Capital02 — Advisory
Personal
Advisory
Dimitris Maniatis provides high-trust advisory services to organisations and executives navigating critical transitions — from AI-led transformation to commercial strategy, business development, and market entry.
Select Mandates03 — Operations
Asset
Management
The company oversees the management of family business assets — real estate, financial holdings, and operating company interests — applying rigorous governance to protect and grow wealth across generations.
Family Office04 — Partnerships
Selective
Collaboration
We engage with founders, operators, and institutions on a partnership basis where genuine value alignment exists. Our bar is high — we prefer depth over breadth, and long-term relationships over transactional engagements.
Invite OnlyThe Principal
Dimitris
Maniatis
Dimitris founded allthingsweb, building it into a leading digital agency before completing its acquisition by IPG — Interpublic Group, one of the world's largest marketing communications conglomerates — in 2014.
He subsequently served as CEO of Upstream, a mobile commerce and marketing technology platform majority-owned by private equity firm Actis. He led the company through a period of strategic repositioning and was instrumental in executing the transaction sale of Upstream to Intersel.
Beyond operating roles, Dimitris has invested in private assets and built a sustained commitment to executive education and peer learning — serving on boards and in leadership roles within communities of senior executives, convening world-class faculty and substantive programming.
Portfolio
Our
Holdings
DeyenCo holds controlling and minority stakes in ventures where the principal has both conviction and the ability to add value beyond capital. We do not diversify for diversification's sake.
Build Collective is a software development company that leverages artificial intelligence to deliver complex systems at a significantly accelerated pace. The firm works with clients across industries to design, build, and deploy technology solutions — from custom platforms to AI-augmented workflows.
With AI embedded into every stage of the development lifecycle, Build Collective achieves delivery speeds and quality benchmarks that distinguish it from conventional software houses. DeyenCo is a co-founder of and investor in the company, holding a 50% stake.
Questions
Frequently
Asked
What is DeyenCo?
DeyenCo is a private holding and advisory company based in Athens, Greece, founded in 2023 by Dimitris Maniatis. It manages family business assets, invests in transformative ventures, and provides personal advisory services. DeyenCo is a principal-driven holding structure — not a fund and not a consultancy.
Who founded DeyenCo?
DeyenCo was founded by Dimitris Maniatis, a Greek entrepreneur and investor. He previously founded the digital agency allthingsweb, acquired by Interpublic Group (IPG) in 2014, and later served as CEO of Upstream, a mobile technology company in the Actis portfolio, where he led its transaction sale to Intersel.
What companies does DeyenCo hold or invest in?
DeyenCo is a co-founder of and investor in Build Collective, an AI-augmented software development company based in Athens, Greece, holding a 50% stake. DeyenCo also manages private real estate and financial assets.
Where is DeyenCo located?
DeyenCo is headquartered in Athens, Greece.
What is Build Collective?
Build Collective is a software development company that leverages artificial intelligence to build systems at an accelerated pace. DeyenCo is a co-founder and investor, holding a 50% stake in the company.
Contact
Get in
Touch
DeyenCo operates a selective engagement model. We welcome introductions from individuals and organisations with whom genuine alignment exists.
Enquiries by introduction preferred.
If you are considering an advisory engagement, exploring a strategic partnership, or have a matter of mutual interest, we welcome a brief introductory conversation.
For matters relating to Build Collective, please visit the company directly.
Athens · By Appointment