IL46: The Business Model Trap: Why Short Ideas Start in the Real World ft. Mark Roberts
Top Traders Unplugged
Niels Kaastrup-Larsen
4.8 • 712 Ratings
🗓️ 25 February 2026
⏱️ 62 minutes
🧾️ Download transcript
Summary
In today’s episode we talk to Mark Roberts, founder of Off Wall Street, a legendary provider of short selling research to hedge funds. Seven months before Enron became the biggest bankruptcy in US corporate history, Off Wall Street published a report recommending the shares be sold. The success of this call made Mark and Off Wall Street synonymous with original and rigorous research. We talk to Mark about his unusual personal background, how being a hippie in Berkeley in the 1960s prepared him for identifying overvalued companies two decades later. He explains why questionable accounting and high valuations are the “symptoms, not the disease” and compares today’s markets with those of the Dotcom era. His new book, Off Wall Street How To Win At Short Selling By Betting Against The Crowd was just released in February 2026.
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Episode TimeStamps:
01:41 - Introducing Mark Roberts, Off Wall Street, Enron, and the book
03:35 - An unconventional path: French literature, skepticism, and early life choices
07:40 - The first “short sale”: selling a failing steel business and learning risk firsthand
11:10 - Fidelity, Peter Lynch, and the origins of independent short research
16:48 - Founding Off Wall Street and the first major short thesis (TCBY)
27:34 - How short ideas are built, tested, and abandoned without sunk-cost bias
30:56 - Business models vs accounting: why accounting issues are symptoms, not causes
40:11 - Timing, crowd psychology, and surviving being early on a short
47:08 - Why short selling is dangerous for individuals and crowded trades fail
52:44 - Markets today vs the dot-com era, passive flows, and portfolio construction
Copyright © 2025 – CMC AG – All Rights Reserved
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Transcript
Click on a timestamp to play from that location
| 0:00.0 | So it's one of the core issues, if you're a short-seller, |
| 0:11.4 | and you want to be able to analyze the actual business prospects. |
| 0:16.2 | So if you understand the business model, you really have to understand the business itself. |
| 0:20.8 | You have to understand the competition. You have to understand the business model, you really have to understand the business itself. You have to |
| 0:21.2 | understand the competition. You have to understand the customers. We always had somebody on the |
| 0:27.7 | ground. You know, we knocked on doors. We talked to our customers. We talked to competitors. We |
| 0:34.0 | were trying to understand what the real market was and whether approached what the bulls |
| 0:41.0 | in a certain idea thought. |
| 0:45.7 | Imagine spending an hour with the world's greatest traders. |
| 0:49.7 | Imagine learning from their experiences, their successes, their successes, and their failures. |
| 0:54.1 | Imagine no more. Welcome to |
| 0:56.7 | Top Traders Unplugged, the place where you can learn from the best hedge fund managers in the world, |
| 1:02.2 | so you can take your manager due diligence or investment career to the next level. Before we begin |
| 1:07.5 | today's conversation, remember to keep two things in mind. |
| 1:14.2 | All the discussion we'll have about investment performance is about the past, |
| 1:19.0 | and past performance does not guarantee or even infer anything about future performance. |
| 1:23.8 | Also understand that there's a significant risk of financial loss with all investment strategies, and you need to request and understand the specific risks from the investment |
| 1:27.9 | manager about their product before you make investment decisions. Here's your host, |
| 1:32.7 | veteran hedge fund manager, Nealz Kostrup Larson. |
| 1:40.8 | For me, the best part of my podcasting journey has been the opportunity to speak to a huge range of extraordinary people from all around the world. |
| 1:49.0 | In this series, I have invited one of them, namely Kevin Koldine to host a series of in-depth conversations |
| 1:55.0 | to help uncover and explain new ideas to make you a better investor. |
... |
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