Family Office Co-Investment Funds: A Structuring Guide

How family offices use co-investment fund structures to deploy capital alongside partners: vehicle choice, governance, alignment, and the pitfalls to manage.

Family offices have become some of the most active and sophisticated allocators of private capital in the world. Increasingly, they are not content to be passive limited partners in someone else's fund. They want to deploy capital directly into the deals they find most attractive, often alongside trusted managers, other families, or operating partners. The vehicle that makes this possible is the co-investment fund.

A co-investment structure allows a family office to participate in specific opportunities, frequently on better economic terms than a blind-pool fund commitment would offer, while retaining a degree of control and selectivity that direct investing demands. But these structures introduce their own legal, governance and alignment questions that must be resolved before capital is committed.

This guide sets out how family office co-investment funds are typically structured, the governance and alignment issues that arise, and the pitfalls that experienced families plan for.

Why family offices co-invest

The appeal of co-investment is straightforward. Lower fees are a primary driver: co-investments are commonly offered with reduced or no management and performance fees relative to a fund commitment, improving net returns. Deal selectivity is another: rather than committing to a blind pool, the family office sees the specific opportunity and chooses whether to participate. Greater influence can follow, as larger co-investors may negotiate information rights or a voice in the investment that a fund LP would not have.

For the lead party offering the co-investment, whether a sponsor, manager or another family, the benefit is access to additional capital for deals that exceed their own capacity, alongside the validation of a credible partner.

Co-investment can take many forms. It may be a one-off special purpose vehicle for a single deal, a club arrangement among several families pooling capital for a defined set of opportunities, or a more permanent co-investment programme that systematically participates alongside a manager's main fund. The right structure depends on frequency, scale and the degree of formality the parties want.

Choosing the vehicle

The structural starting point is usually a special purpose vehicle for each deal or a pooled fund vehicle for an ongoing programme. The choice of legal form and domicile follows from the participants' tax positions, regulatory needs and preference for confidentiality and flexibility.

Limited partnerships are the most common form for pooled co-investment vehicles, because they cleanly separate the passive capital providers, the limited partners, from the party making investment decisions, the general partner. They are familiar to investors and advisers, offer flexibility in how economics are allocated, and are generally tax-transparent so that gains and income flow through to the partners.

For single-deal participation, a company or limited partnership formed as a special purpose vehicle is typical, holding the one investment and unwinding when it is realised. Offshore jurisdictions such as the Cayman Islands, BVI, Luxembourg and others are frequently used for cross-border co-investment because of their neutral tax treatment, familiarity to international investors and well-developed legal frameworks, though the appropriate domicile always depends on the participants and the underlying asset.

Two cautions apply. First, substance and tax considerations must be addressed: a vehicle established purely for form, without genuine management and decision-making, invites challenge in an environment of economic-substance rules and anti-avoidance scrutiny. Second, depending on the number and type of participants and the marketing involved, a co-investment vehicle may attract fund regulation, so the regulatory status should be assessed before launch rather than assumed away.

Governance and decision-making

Co-investment works only when the parties agree, in advance, how decisions are made. The governing documents, typically a limited partnership agreement or shareholders' agreement together with a management or co-investment agreement, should address several questions clearly.

Who controls the investment decision is fundamental. In a manager-led co-investment, the manager usually retains discretion, with the family office choosing only whether to participate in each opportunity offered. In a club deal among families, decision-making may be shared, requiring consent thresholds that must be defined precisely to avoid deadlock.

Information and reporting rights should be set out so co-investors receive timely, adequate information about the investment's performance and any material developments. Exit and realisation provisions matter greatly: the parties must agree how and when the investment will be sold, what happens if one party wants liquidity before the others, and how proceeds are distributed.

Conflicts of interest deserve particular attention where a manager allocates deals between its main fund and co-investors, or where one family leads a deal in which others follow. A clear allocation policy and disclosure framework protects all parties and is increasingly expected by sophisticated investors.

Alignment and economics

The economics of a co-investment determine whether interests are truly aligned. Where a manager offers co-investment, the family office typically benefits from reduced fees, but should understand precisely how any remaining carry or fees are calculated and whether the manager has meaningful capital of its own at risk in the same deal. Skin in the game on the part of the lead party is one of the strongest indicators of genuine alignment.

In club structures among families, alignment turns on each party contributing capital on the same terms, sharing risk and reward proportionately, and agreeing how costs and any internal management responsibilities are compensated. Disputes most often arise where one party bears disproportionate work or risk without corresponding economics, so these arrangements should be made explicit at the outset.

Families should also consider liquidity and time horizon alignment. A co-investment that suits one family's long horizon may not suit another that anticipates needing the capital sooner. Mismatched expectations on holding period are a common source of friction and should be surfaced before commitment.

Common pitfalls to manage

A few recurring problems are worth planning around. Inadequate documentation is the most damaging: handshake co-investments among trusted parties frequently fail when a deal goes wrong or a party needs to exit, and there is no agreed mechanism. Deadlock in shared-control structures can paralyse decision-making; defined thresholds and tie-breakers prevent it.

Regulatory and tax surprises arise when families assume a private arrangement falls outside fund or securities rules, or when the chosen structure produces an unexpected tax outcome for one participant. Concentration risk is a portfolio matter: co-investment naturally concentrates capital in single deals, so it should sit within a deliberate allocation framework rather than accumulating opportunistically.

Planning for these in advance, with proper documentation and advice, is what separates durable co-investment programmes from those that fracture under pressure.

How HPT helps

We advise family offices on designing and implementing co-investment structures that work across borders and over time. That includes selecting the right vehicle and domicile for the participants and the underlying assets, drafting the governance and economic terms that keep parties aligned, addressing substance, tax and regulatory status, and coordinating the structure with the family's wider wealth and succession planning. We also help families assess the conflicts and alignment of arrangements offered to them by managers and other partners.

If your family office is building a co-investment programme or evaluating a specific opportunity, we would welcome the chance to help you structure it soundly.