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[Inside the $4 Billion Endowment Strategy: A Deep Dive with Miles Diffenbach of Carnegie Mellon]-[20VC: Inside Carnegie Mellon's $4BN Endowment | Why 90% of LPs Shouldn't Invest in VC | The $140BN Problem with Multi-Stage Funds | The Hidden Math Behind DPI, TVPI, and Illiquidity with Miles Dieffenbach]

The Twenty Minute VC (20VC): Venture Capital | Startup Funding | The Pitch · B2 · 2025-08-04

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📋 Summary

Navigating the Endowment Model: Insights from CMU's Miles Diffenbach

In a rare and candid conversation, Miles Diffenbach, Managing Director of Investments at the Carnegie Mellon University (CMU) Endowment, joined 20VC to peel back the curtain on how a $4 billion institutional fund operates, evaluates venture capital, and manages the risks of the modern private market.

The Endowment Framework: Risk-First Allocation

Diffenbach describes CMU's portfolio as a "best athlete" model. With 85% in equities and 15% in fixed income, the endowment targets a 50/50 split between private and public assets. Within the private bucket—which includes venture capital, private equity, and private credit—the goal is to maximize "risk-adjusted returns." Diffenbach emphasizes that they view every asset class through a "lens of risk first," noting that for venture capital, the risk is inherently high, requiring significant compensation in returns.

The Venture Capital Paradox: Are LPs Getting Paid?

One of the most provocative points Diffenbach makes is his skepticism toward current venture returns. He argues that, based on historical data from 1998 to 2016, the median IRR for the asset class is only around 8%, with top quartile funds hitting 15%. When compared to the QQQ (NASDAQ 100) as a public market equivalent (PME), he asserts: "Absolutely not. You're not getting paid for the risks that you're taking."

He further posits that 90% of limited partners (LPs) should not be investing in venture capital unless they have access to "top decile" managers. Below that tier, LPs are rarely beating the public market indices.

The Shift in Venture Strategy: Sourcing vs. Picking

Diffenbach breaks down the venture process into five pillars: sourcing, picking, winning, helping, and selling. He notes that "selling" is a critical, often neglected muscle. Regarding sourcing, he admits there is no "systematic sourcing strategy" for top-tier firms; rather, it is a function of brand and network strength.

He is notably critical of the current trend of $50–$100 million seed funds, calling them the "worst place to be" because they lack the capital to secure meaningful ownership or sufficient diversification to survive the "shrapnel" created by multi-stage firms moving into the seed stage.

The Problem with Large Multi-Stage Platforms

Diffenbach expresses deep concern regarding the ballooning size of multi-stage funds. He illustrates this with a mathematical example: if a fund raises $7 billion and aims for a 4x net return, they need to return $800 billion in exit value. He notes: "Clearly, it's going to be broken off of numerous years, but that's a staggering number." He believes that as funds grow, they move from active venture investing to "passive long-only public equity investing," yet they continue to charge "two and 20" in fees. He suggests that for these mature assets, fee structures should shift closer to "one and 10."

Managing Partnerships and Red Flags

For Diffenbach, the most critical element is the people. He emphasizes that they perform deep "interpersonal risk" and "partnership risk" assessments, conducting at least 20 reference calls per fund. He identifies several major red flags:

  • Selling parts of the management company: "Massive red flag for us."
  • Hubris: Managers who claim their job is "shooting fish in a barrel."
  • Misaligned Incentives: Partnerships that break down due to disputes over who is working the hardest or how carry is distributed.

Looking Ahead: Liquidity and the AI Bubble

Addressing the current market, Diffenbach acknowledges that while the venture book has started "self-funding" through distributions, the industry still has "a lot of wood to chop." Regarding the AI boom, he remains cautious, comparing it to historical technological bubbles. He notes that while OpenAI and Anthropic are transformative, their massive capital burn makes them vulnerable. "This would be the ultimate anomaly if a bubble did not pop in AI," he observes.

Ultimately, Diffenbach’s philosophy remains grounded in the long game. Because an endowment backing a manager is committing to a 15-to-25-year relationship, he prioritizes integrity and alignment over temporary market hype, concluding that while he loves business models, he remains a rigorous gatekeeper of the "unit of return per unit of risk."

🎯Key Sentences

1
I think everyone at that age thinks you're invincible.
2
Life is an incredible joy and a blessing, right?
3
We take everything from a lens of risk first, starting off.
4
That's the million dollar question.
5
I'm willing to be wrong here, but I think there's a lot of luck in sourcing.
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📝Key Phrases

1
top decile
2
red flags
3
hot seat
4
get on the same page
5
game changer
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📖 Transcript

So my message here to all venture capitalists, now is the time.
Please take your companies public.
I breathe investing.
These business models, these GPs are creating, are some of the best high margin businesses ever created.
My question to any new allocator or an investor is do you think you're going to have access to top decile managers?
Because at that point, top decile, you are achieving returns above the PME consistently.

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