Selling a collection: off-market, private sale or auction?

29. September 2026

Reading time: approx. 9 minutes

Anyone who wants to sell a collection or a single important work usually hears from an auction house first. That is understandable: auctions are visible, their results are published, and the major houses have specialists for almost every collecting field. But the auction is only one of three routes, and for many situations not the best one. This article compares auction, private sale and off-market sale along the questions that really matter to the seller: price, discretion, time, risk and cost.

The three routes at a glance

Auction. The work is offered publicly, with catalogue, estimate and preview. The price is formed in competition between bidders on a fixed date. The auction house earns from both seller and buyer.

Private sale through a dealer or gallery. The work is consigned to a dealer or sold to him outright. The dealer offers it to his clients, usually with a mark-up. The seller rarely learns at what price the work eventually changes hands.

Off-market sale. The work is offered selectively to a small number of pre-identified collectors, foundations or institutions, without catalogue, without publication, without a public trace. An independent adviser structures the process on the seller’s side and keeps price and terms transparent.

Price: competition versus negotiation

The strongest argument for auction is bidder competition. When two determined buyers are in the room or on the phone, prices emerge that no private sale can match. That holds for sought-after names in sought-after periods, with good provenance and fresh to the market.

The argument turns when the competition fails to materialise. If a work goes unsold it is “burnt”: the market has seen that nobody wanted it, and the price will be lower at the next attempt. An off-market sale carries no such risk, because nothing becomes public. The price is formed in negotiation with the one right buyer, often on the basis of an independent valuation that both sides accept.

Discretion: who may know that you are selling

An auction is public by definition. Neighbours, business partners and family can read in the catalogue what is being sold from which house. For entrepreneurial families, for estates with heirs who disagree, for divorces, and for anyone releasing capital without wanting it noticed, that is a real problem.

The off-market sale was developed for precisely these cases. The circle of people approached is small and known, prospective buyers sign confidentiality agreements, and the seller decides to whom the work is shown at all.

Time: dates versus processes

Auctions follow a calendar. Several months often lie between consignment and payment, and anyone who misses the deadline waits for the next suitable season. In return, the procedure is clear and the result is known on the day of the sale.

Off-market sales are more flexible, but not automatically faster. The right buyer for an important work is rarely found in two weeks. On the other hand, the process can be accelerated or paused as needed without a withdrawal ever becoming public.

Cost: what is left of the proceeds

At auction the seller pays the seller’s commission, insurance, catalogue, transport and, where necessary, restoration costs; on the buyer’s side the buyer’s premium dampens the willingness to bid. In a dealer sale, the dealer’s margin usually remains invisible to the seller. In an off-market sale with an independent adviser, the seller pays a fee based on the work involved and agreed in advance; the adviser takes no commission from the other side and has no sales interest of his own.

Which route leaves more in net terms depends on the work, the market and the timing. That is why every serious sales process begins with an independent valuation, not with a consignment.

Which works belong where

  • Auction: sought-after artists in sought-after periods, works with documented provenance, objects in the middle price range where an off-market process is not worth the effort, and groups of works to be settled in a single sale.
  • Private sale through the trade: works for which a particular dealer demonstrably has the right clientele, and situations in which a quick direct sale matters more than the last franc.
  • Off-market: important single works, entire collections, estates requiring discretion, works that have already gone unsold once, and all cases in which the seller wants to keep control over price, buyer and publicity.

How an off-market sale actually works

It begins with an inspection: condition, provenance, literature, market comparison. This produces a valuation report with a realistic price range. A short list of possible buyers is then defined, agreed with the seller and approached discreetly. Prospective buyers receive documentation only after signing a confidentiality agreement; viewings take place at a neutral location. The adviser conducts the negotiation on the seller’s behalf; contract, payment through an escrow account, transport and insurance are coordinated with the seller’s own professionals. At no point does the adviser act as buyer, dealer or consignor himself.

More on this service: Private sales and acquisitions. If the sale arises from an estate, it is worth reading Art in an estate: what executors and heirs should clarify first beforehand. And anyone who needs liquidity but does not want to sell will find the alternative under art lending.

A short enquiry is all it takes for a confidential conversation about a specific work or collection.

Thomas Reinshagen

Thomas Reinshagen ist unabhängiger Berater für Kunst und Luxusgüter mit Sitz in Zollikon. Über drei Jahrzehnte Markterfahrung im Kunst- und Luxusgüter-Geschäft, davon mehrere Jahre als Senior Director bei Sotheby’s Zürich. Akkreditierter Berater bei diversen renommierten Finanzinstituten und Banken. Wertgutachten werden von Steuerbehörden, Versicherern und Finanzinstituten anerkannt. Eingetragen im Spear’s 500 Index der internationalen Kunst- und Vermögensberater. Eigene Sammler-Praxis in zeitgenössischer Kunst, Photographie und Uhren seit über 30 Jahren. Mehr erfahren

Thomas Reinshagen is an independent adviser for art and luxury assets based in Zollikon, Switzerland. Over three decades of market experience in the art and luxury goods business, several of them as Senior Director at Sotheby’s Zurich. Accredited adviser to several reputable financial institutions and banks. Valuations are recognized by tax authorities, insurers and financial institutions. Listed in the Spear’s 500 index of international art and wealth advisers. Own collector practice in contemporary art, photography and watches for over 30 years. Learn more