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The best investment management requires a complete picture of a client’s portfolio. But for many wealth managers, collectibles remain a missing piece of the portfolio puzzle. Passion assets such as art, classic cars, wine, and watches can represent a significant part of an ultra-high-net-worth client’s wealth, and yet rarely appear in the same report as everything else.
The prominence of passion investing continues to grow. According to the Art Basel and UBS Survey of Global Collecting 2025, high-net-worth individuals allocated around 20% of their wealth to art and collectibles, up from 15% the year before.1 For EMEA advisors managing complex, multi-generational portfolios, the question has shifted from whether collectibles belong in total wealth reporting to how they can be handled at scale.
During a recent webinar, Addepar and Overstone explored what it takes to bring collectibles into professional portfolio reporting, the technology making it possible, and the trends reshaping the passion investing space.
1. The alternative allocation is growing
Of the nearly $9 trillion managed on the Addepar platform, 40% sits in alternatives. Within that, collectibles and passion assets represent a growing share.
"There's over $2 trillion worth of art and collectibles in private hands. So, it's a fairly substantial asset class,” says Harco van den Oever, CEO, Overstone. “87% of collectors would like to integrate collectibles into their wealth management portfolio. This is a really important industry."
With Deloitte projecting UHNW collectible wealth to reach $3.47 trillion by 2030, leveraging technology to measure and report on these assets is rapidly becoming a necessity.2
For advisors, managing every asset, including alternatives like collectibles, on a single platform such as Addepar enables deeper portfolio analysis and more meaningful client insight.
2. Valuation is moving from static to real-time
Collectibles have historically been valued annually, and measuring their liquidity has been a challenge. The $40 billion art lending market demonstrates that collectors have long found ways to quantify value from collections without selling; what has been missing is the data infrastructure to quantify it with precision.3
But with advancements in wealth management technology — specifically AI — value is becoming measurable in real time. The Deloitte 2025 report identifies AI and blockchain as the technologies now directly addressing the art market’s long-standing challenges around valuation and provenance.2
One example is Overstone's platform, which generates a “saleability” score: a probability of selling a given object at a given price within a three-month window, benchmarked against the broader market. This turns what was once a static annual appraisal into a dynamic, continuously updated portfolio metric. For advisors, this has a significant impact on analysis, reporting, and investment decisions.
3. AI amplifies human expertise, but does not replace it
“AI is enabling us to scale art and collectible dynamic revaluations,” says van den Oever. But scale is only half the story. For example, Overstone's specialist team are vital to valuations, bringing market knowledge, provenance expertise, and category-specific insight that data alone cannot provide. Transparency and trust in art valuations, for example, often depend on collaboration between technology and human professionals — not one or the other.
Van den Oever, a former investment banker who was previously the Global Managing Director for the Impressionist & Modern Art Department at Christie's, founded Overstone after recognising a fundamental gap: "There was no structure, there were no tools available to understand art and collectibles as financial assets." That expertise is now embedded in the valuations Overstone delivers, and it is what makes the output trustworthy enough to use in the decisions that matter most.
4. The great wealth transfer makes accurate valuation urgent
Nearly $1 trillion in art and collectibles is expected to change hands over the next decade. The Art Basel and UBS data shows that 80% of collectors plan to pass their collections to children or spouses, with almost 90% of Gen Z collectors who have inherited works choosing to keep them.¹ That generational handover is creating real urgency around accurate, documented valuation. Without it, the decisions that matter most to clients cannot be made with confidence.
"Estate planning is a massive topic right now: ‘Am I correctly insured? Am I paying the right premium?’" says van den Oever. And what's becoming bigger and bigger is leverage: ‘Can I use my collection as collateral to raise additional liquidity?’" These are the conversations advisors are already having with clients, and now the data exists to support them.
5. Consolidation creates a single source of truth
Integrated collectibles reporting enables consolidation, which is advantageous for advisors looking to get a complete portfolio picture. Client data has historically been fragmented across spreadsheets, custodian feeds, and disconnected documents, with no single authoritative view.
“The challenge always is, what is the version of the truth? And I think what’s beautiful here is that you have one version of the truth. You know that what you’re looking at is the version of truth. I think that’s super powerful,” says van den Oever, speaking of Addepar
When collectibles data flows into the portfolio alongside equities, private credit, and real assets, advisors are able to report accurately and answer questions which were previously a challenge.
Finding the solution: Addepar Alts Data Management and Overstone
Addepar is an AI-native technology and data platform, bringing every asset class into a single, accurate, timely view.
Addepar's Alts Data Management capability makes this possible for collectibles at scale. Alts Data Management aggregates and normalises data from custodians, private fund managers, and specialist partners like Overstone into one calculation-ready environment so that real estate, art collections, and a private equity fund are measured, compared, and reported through the same system.
Overstone powers the collectibles side of that equation, taking client data in whatever form it arrives — spreadsheets, PDFs, and invoices — and structuring and valuing it. The result flows directly into Addepar, enriching the total portfolio picture in real time.
"Addepar and Overstone is really completing that total picture of wealth and the ability to use that data for estate planning, tax optimisation, and valuing difficult-to-value assets," says Craig Hall, Senior Account Executive, Addepar.
With the continuing growth of passion investing and alternative assets, platforms like Addepar are making valuation and reporting from a single source of truth possible for the first time. For EMEA wealth managers, the infrastructure to manage passion assets alongside the rest of the portfolio is no longer out of reach, and the case for acting on it has never been stronger.
References
1 Art Basel and UBS Survey of Global Collecting 2025, authored by Dr. Clare McAndrew, Arts Economics. Published 2025. Available at: artbasel.com
2 Deloitte Private and ArtTactic Art & Finance Report 2025. Published November 2025. Available at: deloitte.com
3 The Art Newspaper, 'Barely worth its weight in gold: can art still be considered an asset class?', 25 November 2025. Available at: theartnewspaper.com
Addepar and Overstone Webinar: ‘Introducing Collectibles into Wealth Reporting with AI and Human Expertise’, 2025.