Podcast Summary: How I Invest with David Weisburd

Episode: E323: How Billionaires Build Their Portfolios
Guest: Jonathan (CIO, Defined Capital)
Date: March 12, 2026
Duration: ~36 min (main content)

Overview

In this episode, David Weisburd speaks with Jonathan, Chief Investment Officer at Defined Capital, about the real-world mechanics of building investment portfolios for billionaire families and large family offices. They explore the different needs and mindsets between first-generation and inherited wealth, the structural challenges of bank-advised investing, effective portfolio construction for ultra-high-net-worth investors, family governance, and the most underappreciated changes currently shaping the family office landscape—including the growing importance of tax-aware strategies and holistic portfolio management.

Key Discussion Points & Insights

1. Why Family Office Needs Aren’t Met by Big Banks

• Structural Conflicts at Banks (00:21–02:14)

  • Jonathan reflects on his sell-side experience, noting that big banks are "consensus machines" focused on product placement rather than genuinely impartial advice.
  • Quote [00:32]: “Everything the sell side does is about not rocking the boat...There’s a structural problem. You have institutions that are doing custody advice and product under one roof. And when you do that...what advice you’re giving may not be the best advice for a client.” — Jonathan

• Incentive Misalignment (02:14–03:09)

  • Banks’ compensation structures incentivize promoting their own products and fee waivers, not always aligning with client needs.
  • Independent advisors, by contrast, have the freedom to select from the “entire universe” of investment products.

2. First-Generation vs. Inherited Wealth

• Mindset and Portfolio Behavior (03:19–04:48)

  • First-generation (Gen1) wealth is operationally driven, aggressive, focused on growth, and hands-on. Transitioning to preservation requires a mindset shift.
  • Second-generation (Gen2) is typically more conservative, focused on wealth preservation and lifestyle continuity, sometimes less calculated in risk-taking.

• Key Insight (04:36):

  • "The hunger starts to go away...you really see it with the family investment committee into how they think about this pool of capital and growing it over time." — Jonathan

• Subtleties in Motivation (06:15)

  • David summarizes: “Gen1 is hungry for returns...Gen2 is almost hungry to prove themselves...I find this different hunger and different drive.”

3. Key Pre-Liquidity Planning for Entrepreneurs

• Estate Planning Early (06:57–08:35)

  • Jonathan advises business owners to structure trusts, FLPs, and gifting years before an expected exit (even during down years—gift shares at lower valuations).
  • Proactive planning can save “truly millions of dollars” down the road.

• Practical Example (08:05–08:35)

  • David illustrates gifting shares at a low 409A valuation to avoid 50% estate taxes.

4. Investment Universes: $50M vs. $50M+ Families

• Governance and Structure for Larger Fortunes (09:31–10:39)
  • Crossing $50M is the "generational wealth" threshold, making family governance and documented, institutionalized investment frameworks essential.
  • Under $50M, investing is typically “scrappier” and less structured.

5. Portfolio Construction for Ultra-High-Net-Worth

• What a $1B Family Office Portfolio Looks Like (10:45–12:07)
  • Heavy allocation (>50%) to alternatives (private equity, venture, real assets), minimal public markets.
  • Focus on income generation and robust diligence processes to ensure each alternative investment adds true portfolio value.

6. Tax-Aware Strategies: Family Offices vs. Institutions

• Why Taxes Matter (12:25–13:08)

  • Traditional managers often neglect tax implications, still operating as if their only clients are endowments.
  • Asset location and tax reporting (e.g., K-1 quality) are now critical for family offices.

• Industry Shift (14:03–15:10)

  • Movement from “portfolio silos” to holistic, net-of-tax, net-of-fee returns across all asset classes.
  • Tax inefficiency is increasingly unacceptable, especially as retail and RIA-driven capital flows into alternatives.

7. Building Billion-Dollar Portfolios for Taxable Investors

• Starting with Constraints and Family Strengths (15:16–20:49)

  • Begin by modeling cash flow needs and liquidity management—most families aren’t focused enough here.

  • Segment components where families want to be hands-on (e.g., operator, LPAC) and adjust the rest.

  • Memorable Anecdote (20:49):
    “They over committed to all these funds...They had to go into their operating business, get a new line of credit...That’s what happens when you build your investment portfolio without that liquidity structure in place from day one.” — Jonathan

8. Drawdown Vehicles & Liquidity Premiums

• Pushback on Long-Term Lockups (21:44–23:45)

  • Families are now highly sensitive to locking up money 10–15 years in vehicles like venture; require a justifiable liquidity premium.

• Psychological Dynamics (24:31–25:43)

  • Time horizons shrink as wealth creators age; media coverage of instant wins stokes impatience.

9. Lower-Middle-Market Private Equity: Why It’s a Favorite

• Value Creation & Inefficiency (26:49–29:27)

  • Institutional dry powder is too large for small deals; less competition, more operational value-add opportunities (especially in manufacturing, industrial, and value-add distribution).
  • Quote [26:54]:
    “The growth of mega funds has created this massive inefficiency in the space...creates an inefficient market and great opportunities for buyers.” — Jonathan

• Exit Premiums (29:07):

  • Can “graduate” companies to sell to the larger funds with excess capital.

10. Independent Sponsors

• How to Access and When (30:34–31:35)
  • Favor independent sponsors with significant personal capital and commitment, not just serial deal churn.

11. The Most Common Mistake: Over-Diversification

• Too Many Managers, Too Little Value (31:42–32:42)
  • Families with $50M–$500M often spread themselves across too many funds without adding alpha:
  • Quote: “What that does is basically give you a beta private equity portfolio you could have just invested in one fund of funds. You didn’t create anything interesting.” — Jonathan

12. High-Impact Uses of AI in Family Offices

• Where NOT to Use It (32:47–34:13)
  • AI isn’t for fund or manager selection—human judgment, relationship, and alignment still rules.
• Where It Excels
  • Data processing, research (extracting data from memos/decks), and client communication content.

13. Timeless Career Advice

• Ask for What You Want (34:13–35:03)
  • “The answer is always no if you don’t ask...Being afraid to ask any question is a career hinderer.” — Jonathan

Notable Quotes & Memorable Insights

• On Sell-Side Limitations
  “You can tell me you’re a fiduciary...but when half your firm is building products and your bonus structure is all about those products...that’s not the best advice for your client.” — Jonathan (02:14)

• On Inherited vs. First-Gen Wealth
  “There is this hunger that starts to go away. You really see it with the family investment committee into how they think about this pool of capital.” — Jonathan (04:36)

• On Pre-Liquidity Planning
  “Even if you think the exit’s 10 years away...You might have an opportunity today to gift shares at a valuation that you’ll never get again.” — Jonathan (06:57)

• On Over-Diversification
  “From a family office structure standpoint, you can barely manage it because you don’t have a full infrastructure in place yet. And then...just trying to understand and follow and monitor those investments doesn’t work.” — Jonathan (32:14)

• On AI in Investing
  “Nothing will beat judgment and experience and talking to a person...We don’t invest in funds, we invest in people.” — Jonathan (32:47)

Timestamps for Key Segments

• 00:21 — Why banks fail family offices
• 03:19 — Mindset: First-gen vs. inherited wealth
• 06:57 — Pre-liquidity planning for entrepreneurs
• 09:31 — Family offices: $50M vs. $50M+ investment universe
• 10:45 — $1B family office portfolio construction
• 12:25 — Tax-aware portfolio management
• 14:03 — Move to holistic, net-of-fee/tax absolute returns
• 15:16 — Holistic design for billion-dollar portfolios
• 20:49 — Cautionary liquidity over-commitment anecdote
• 21:44 — Pushback on long-duration lockups
• 24:31 — Aging founders, psychology, and liquidity
• 26:49 — Lower-middle-market PE opportunity
• 30:34 — Evaluating independent sponsors
• 31:42 — Common mistake: over-diversification
• 32:47 — Where to use AI in family offices
• 34:13 — Timeless career advice

Conclusion

Jonathan’s perspective, deeply rooted in practical experience with both legacy and first-generation billionaire families, offers a masterclass in both the technical and psychological dimensions of ultra-high-net-worth investing. From the imperative of early, family-centered structuring and liquidity management, to the pitfalls of over-diversification and the smart use (and limitations) of AI, the episode provides a roadmap and mental model for family offices striving to build enduring, resilient wealth platforms in a competitive and rapidly changing environment.