IL46: The Business Model Trap: Why Short Ideas Start in the Real World ft. Mark Roberts

13 snips

Feb 25, 2026

Mark Roberts, founder of Off Wall Street and pioneer of investigative short-selling research, shares his unconventional path from Berkeley to spotting major market mispricings. He discusses why broken business models, not just accounting, topple companies. Fieldwork, management language, timing challenges, and how today’s passive flows shape opportunities are explored in concise, surprising stories.

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ANECDOTE

First Short Sale Came From Selling The Family Steel Business

Mark sold his family's failing steel service center as an asset sale to avoid bankruptcy.
The buyer paid for property, trucks, a locomotive and inventory, teaching Mark an early lesson about business distress and asset value.

ANECDOTE

TCBY Report Launched Off Wall Street

Mark Roberts launched Off Wall Street by researching TCBY after franchising experience revealed unhappy franchisees.
He printed a May 1990 report titled TCBY Is In Deep Yogurt, traveled to franchise conventions, and sold subscriptions to hedge funds.

INSIGHT

Research Business Model Avoids Performance Pressure

The research business model can be more stable than running a short-only hedge fund because income isn't tied to yearly P&L.
Roberts preferred selling research subscriptions to managing money, which avoided compensation biases toward longs.

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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

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