Running a Family Office Under $100M

A Wealth Operating System for Founders with $5M–$50M in Liquid Assets

If you have between $5 million and $50 million in liquid assets, you've probably noticed something: the wealth management industry doesn't know what to do with you.

Below $5 million, retail solutions work fine. A roboadvisor, a decent financial planner, your bank's premier tier. Nothing sophisticated, but it gets the job done.

Above $100 million, you get institutional everything. Dedicated teams, bespoke structures, tier-one private banks competing for your business. J.P. Morgan Private Bank's minimum is $10 million, but its full suite of services really kicks in at that level. Goldman Sachs Private Wealth Management also requires $10M, and charges fees ranging from 0.75% to over 2% depending on the complexity of your situation. At those levels, the economics work—they can afford to build infrastructure around you.

But between $5 million and $50 million (or even $100m)? You're too wealthy for the basic stuff and not wealthy enough for the institutional machinery. This is exactly where most founders land after a successful exit.

What happens next is predictable. You cobble things together.

An investment account here, a pension there. A private deal a friend brought you. Some crypto you bought in 2017 that's now meaningful. A tax advisor who's never spoken to your investment manager. A legal structure that your accountant suggested and that your lawyer doesn't fully understand. Documents scattered across email, Dropbox, and a folder somewhere on your laptop you'd struggle to find.

It's not a system. It's sediment layers accumulated over time without anyone looking at the whole picture.

Family Office Question

More founders are talking about family offices. The term has become aspirational—a marker that you've "made it." The good news: technology has significantly reduced the cost of sophisticated wealth infrastructure. You don't need $250 million to run something that resembles a family office anymore.

But there's a question worth asking before you go down that path: do you actually need one?

Many business owners declare they're "setting up a family office" without being able to articulate what problem they're solving. When pushed, the answer is often some version of "my friends have one" or "it seems like the thing to do at this level." That's not a strategy. It's expensive mimicry, the status game.

Conversely, some founders go straight for institutional-grade infrastructure—prime brokerage accounts, complex entity structures, the full shebang. Then reality sets in. They aren't trading frequently enough to justify the prime broker minimum fees (Morgan Stanley's starts at around $5 million in AUM; Goldman's is higher). They're paying $60,000+ annually in maintenance costs for structures that serve no practical purpose. Within two years, they've unwound most of it.

The goal isn't to have a family office. The goal is to have the right infrastructure for your actual needs. No more, no less.

What This Playbook Covers

This playbook walks through each component of a founder's wealth operating system.

Chapter 1: What a Family Office Actually Does. The five core functions every family office performs, regardless of scale.

Chapter 2: Three Operating Models for Sub-$100M. Coordinated Network, Virtual Family Office, and Lean SFO—with cost comparisons.

Chapter 3: Structure—The Foundation. Holding companies, SPVs, trusts, and jurisdiction selection at different wealth levels.

Chapter 4: Treasury—How Money Moves. Banking tiers, multi-currency, cash management, and securities-based lending.

Chapter 5: Portfolio Construction for Founders. The Core-Satellite framework and building portfolios that use founder advantages.

Chapter 6: Income Generation Strategies. The Income Floor concept and funding life without depleting your growth engine.

Chapter 7: Building Your Advisory Team. Who you need, how to evaluate them, and how to make them work together.

Chapter 8: Protection—Keeping What You've Built. Asset protection, insurance, cybersecurity, and succession planning.

Chapter 9: Governance and Decision-Making. Systems for making decisions and avoiding emotional mistakes.

Chapter 10: Implementation Principles. Sequence, pacing, and milestones for putting this into practice.

Chapter 11: Common Mistakes and How to Avoid Them. Predictable errors that destroy wealth, with prevention strategies.

Where to Start

Not sure where to begin? Start with the guide that matches your situation:

Just Had an Exit? The First 90 Days. What's urgent, what can wait, and what to avoid entirely in the window after liquidity.

Exit on the Horizon? Pre-Exit Planning. The 12-18 month window. What's possible now that won't be later.

Already Have Infrastructure? Audit What You Have. Signs it's working, signs it needs change, and how to evaluate.

Feeling Overwhelmed? The Minimum Viable Setup. Strip away complexity. What you actually need — and permission to stop there.

Want the Quick Reference? One-Page Framework. The entire playbook condensed. Principles, questions, warning signs. Bookmark this.

Why Standard Wealth Advice Fails Founders

The wealth management industry was built for corporate executives or high-earners—people who accumulate wealth slowly through salaries, max out their pension contributions, and retire at 60. The entire infrastructure assumes that trajectory. That's not how founders work.

You made money fast by investing in a concentrated equity position in something you built from scratch. You didn't diversify your way to wealth. You took a massive bet on yourself, and it worked. Now everyone's telling you to do the opposite of what got you here.

This is where people get confused about the difference between concentration and diversification. They're two sides of the same coin: you create significant wealth through concentration (risk), and you protect wealth through diversification.

This advice feels off because it is off.

It's generic. "Diversify across asset classes" ignores everything specific to your situation—your concentrated position, liquidity timeline, private market exposure, international complexity, tax residency, family dynamics.

Most advisors haven't done what you've done. Most wealth managers have never built a company, never managed a cap table, never experienced going from $2 million to $20 million in a few years. They understand portfolio theory. They don't understand founder reality.

And the incentives are misaligned. Wealth managers get paid on assets under management. Most want your money in their products. They can't advise on things their compliance hasn't approved.

There's nothing wrong with that model—it works for most people. But you're not most people, and it wasn't designed for how you got here.

Fragmentation Tax

There's a hidden cost to the cobbled-together approach. Call it the fragmentation tax.

It's not a line item on any statement. It's the aggregate cost of uncoordinated wealth management:

Tax inefficiency from advisors who don't coordinate. One sells a position while another is harvesting losses. One recommends an investment structure without understanding the tax implications that your accountant would have flagged.

Opportunity cost of assets in suboptimal places. Cash earns nothing in one account while you're paying margin interest in another. Nobody's looking at the whole picture.

Risk exposure from gaps nobody noticed. Insurance that hasn't scaled with your wealth. Estate documents that don't reflect your current structure. Maybe you work in tech, so you already have high exposure—then investing in the S&P 500 (with its heavy tech weighting) adds concentration risk you didn't intend.

Mental overhead of coordinating it yourself. The cognitive load of being the only person who sees the full picture.

From what I've seen, the fragmentation tax runs between 0.5% and 2% annually in aggregate—drag that's never visible on a single statement but can add up to millions over a decade.

Here's a number that should concern you: research from Owner.One's Penguin Analytics surveyed 13,500 wealth owners with $3M–$99M across 18 countries. They found that 74.6% of families lose a portion of their wealth during generational transitions, with average capital erosion of 31%!!! The primary cause wasn't market volatility—it was poor documentation, unstructured processes, and a lack of asset visibility. Critical details about holdings are held by the founder and aren't transfer-ready for spouses or heirs.

What a Family Office Actually Is

The term "family office" conjures images of old money, armies of staff, private jets, champagne for breakfast. Think Succession series.

This makes the concept seem irrelevant to founders with $10 or $50 million. It also obscures what a family office actually is.

Strip away the preconceptions, and a family office is simply a wealth operating system—a coordinated approach to managing your financial life. It's not about status. It's about having the right infrastructure for your situation.

Think about running your money like running a business. All components need to work together.

Five Core Functions

Every family office—whether a billionaire's staff of twenty or a founder's coordinated network—performs five functions:

1. Investment Management and Oversight. Asset allocation, manager selection, performance monitoring. The question isn't just "what should I invest in?" It's "who ensures all my investments work together?"
2. Tax Planning and Compliance. This is where significant value is created or destroyed. A 10% return taxed at 45% leaves you with 5.5%. An 8% return taxed at 20% yields 6.4%. Structure determines which scenario you're in.
3. Estate and Succession Planning. What happens when you're no longer around—or incapacitated? Most founders delay this indefinitely. The cost of poor estate planning can dwarf any investment loss.
4. Risk Management and Insurance. Protecting against catastrophic events that could destroy wealth regardless of how well it's invested. The threats have evolved—today, digital threats are among the leading causes of direct wealth loss.
5. Administration and Reporting. The unglamorous function that makes everything else work. Consolidated reporting, entity maintenance, document management, coordination.

These functions aren't independent. Changes to your structure affect your tax position, investment access, estate plan, and administration. Most wealth advice treats these as separate conversations. That's why it fails.

Three Operating Models

Hiring a team of dedicated staff doesn't make economic sense until you're well above $100M AUM. Below that, three models have emerged.

Model A: The Coordinated Advisor Network

Best for: $5M–$15M | Lower complexity | Single or dual jurisdiction

You assemble independent specialists: tax advisor, estate attorney, investment platform, insurance broker. Each handles their domain. You serve as the quarterback.

The key word is "coordinated." Having advisors isn't enough. Many founders have advisors who've never spoken to each other. That's not a network—it's silos.

Typical cost: 0.5–0.8% of assets annually | Your time: 5–10 hours per month

Model B: The Virtual Family Office (VFO)

Best for: $15M–$50M | Moderate complexity | Multi-jurisdiction possible

A VFO provider oversees all advisor relationships, provides consolidated reporting, and handles coordination. You still have underlying specialists, but someone else ensures they communicate.

Technology has made this model increasingly viable. Platforms like Addepar now track over $7 trillion in assets across 1,200+ client firms, providing the kind of consolidated reporting that used to require dedicated staff. These platforms can handle everything from public equities to private investments, real estate, and even collectables—the messy multi-asset portfolios that founders actually have.

Typical cost: 0.6–1.25% of assets annually | Your time: 2–5 hours per month

Model C: The Lean Single Family Office (SFO)

Best for: $50M–$100M | Higher complexity | Specific needs

You employ one senior professional—a "Chief of Staff for Wealth"—who takes full responsibility for managing your financial life. You need to trust that person. And verify.

Typical cost: 0.75–1.5% of assets annually | Your time: 2–4 hours per month

Most founders in the $5–50 million range operate in Model A or B.

Six Pillars (Overview)

Each pillar has its own chapter. Here's the essential idea behind each:

Structure. Most founders either overcomplicate (paying $50K+ annually for structures they don't need) or oversimplify (keeping everything in personal name until a lawsuit or succession event reveals the cost). Structure should match your actual complexity.

Treasury. The plumbing. If you have $5M+ sitting with a retail bank, you're leaving money on the table. Consider currency conversion alone: a typical UK private bank charges 1–1.5% on foreign exchange transactions. Interactive Brokers charges 0.002% (that's 0.2 basis points) with a $2 minimum. On $2 million of annual USD/GBP conversions, that's the difference between $40 and potentially $30,000. Securities-based lending lets you borrow against your portfolio instead of selling appreciated assets—often far cheaper than the capital gains tax would have been.

Portfolio Construction. The Core-Satellite framework: 60-70% in liquid, diversified, boring investments (your protection); 30-40% in alternatives where your founder advantages matter (your opportunity).

Income Generation. The Income Floor concept. Separate growth assets from income assets. Let growth compound untouched. Let income fund your life. Market drops 30%? Your income keeps flowing.

Protection. Cybersecurity has become one of the leading causes of direct wealth loss for high-net-worth individuals. The FBI's Internet Crime Complaint Center reported $2.77 billion in losses from business email compromise alone in 2024—and that's just the cases that got reported. Email compromise during wire transfers can result in six- or seven-figure losses, often unrecoverable. A $50 hardware security key protects millions in assets.

Governance. Infrastructure only works if the decision-making process is right. Founders build sophisticated setups, then panic-sell during a crash or commit $2M to a friend's fund without due diligence. Governance is how you make decisions systematically.

Implementation: Pace Over Speed

The biggest mistake is rushing.

Cash earning 4–5% while you figure things out costs almost nothing. A bad $2M decision because you rushed costs, potentially everything.

The sequence:

Stabilise. Cash secure, basic protection in place, immediate risks addressed.

Foundation. Core team assembled, structure established, governance documented.

Build. Portfolio constructed, income allocation established, systems implemented.

Optimise. Refinements, alternatives access, advanced planning.

In practice, most founders reach a functional system within 12–18 months. Full optimisation may take 2–3 years. A working 80% solution beats a perfect solution that never gets implemented.

Common Mistakes

Building infrastructure before you need it. Trusts and offshore structures at $12M, paying $80K+ annually for complexity that serves no purpose.

Sitting too long in cash. $15M earning 4% for two years while the market returns 10%, costs over $1 million in foregone returns.

Deploying too fast. Five PE funds in 60 days without due diligence. Capital calls come unexpectedly.

Fee blindness. 1.8% in excess fees over 20 years on $10M compounds to staggering amounts. Run the math.

Illiquidity creep. Each PE commitment seems manageable until 60% of your wealth is locked for a decade.

Ignoring cybersecurity. Assuming you're "not important enough to target." You are.

Keeping everything in your head. No documentation means no one can continue if something happens to you.

Four Questions Before You Continue

How complex is your situation actually? Single jurisdiction, straightforward investments, simple family? You might need a good accountant and financial planner, not a wealth operating system.

Do you want to understand the system or just outsource it? This playbook assumes you want to understand how things work. If you'd rather hand everything to someone and not think about it, this probably isn't the right resource.

Is your wealth likely to stay at this level or grow? If you're spending down over the next decade, optimise for simplicity. If you expect continued wealth creation, proper infrastructure now pays dividends for decades.

Are you ready to retire, or do you want to keep playing—just at a different level? If you've made your money and want to do something completely different, you probably don't need this. If you see it as a stepping stone to the next level of the game, keep reading.

What This Playbook Is Not

This is educational content, not financial advice, not investment recommendations.

I won't tell you what to invest in or provide specific tax advice. That requires professionals who know your circumstances.

This playbook provides the framework for knowing which questions to ask, what infrastructure you need, and how the pieces fit together. The goal is for you to be a sophisticated consumer of professional advice—not to replace it.

How to Use This Playbook

You can read straight through or jump to what's relevant.

If you're pre-exit or recently post-exit, start with Chapter 1 and work forward. The sequence is intentional.

If you already have infrastructure, use the chapters as a reference to evaluate and improve what you have.

These aren't meant to be read once and forgotten. Come back as your situation evolves.

The operating system you build over the next six to twelve months will serve you for the rest of your life.

Start with: Chapter 1: What a Family Office Actually Does