Episode summary
The Investment Office E12: Surviving as a Short Seller, w/ Carson Block, CEO of Muddy Waters Capital
The Investment Office
· · 1 hr 6 min · Hosts: Wendy · Guests: Carson Block
Summary
Carson Block traces Muddy Waters back to a long run of being skeptical about management claims, from early exposure to accounting scandals to losing money on a China self-storage venture and then publishing the Orient Paper short in 2010. He says the viral response to that report convinced him he had found his calling: using public research to expose frauds rather than selling ideas privately to a small group of clients.
He argues that building a lasting short-selling business required autonomy, institutional borrow, and a risk framework built around target selection, position sizing, and internal debate. Block says he prefers names where the market perception is meaningfully wrong but not necessarily where a company is priced for perfection, and he thinks the best shorts often have real financial or accounting incentives to mislead investors. He also stresses that short sellers must be willing to exit early rather than cling to a thesis out of pride.
Block says the firm has evolved with the market, expanding beyond pure short activism and adjusting how it communicates because investor attention spans have shortened. On AI, he warns that there is a real possibility of major job displacement within three years and says Muddy Waters is positioning defensively with asymmetric trades in case the disruption proves severe.
Key takeaways
- Block says his edge comes from finding a disconnect between management-created perception and reality, especially where accounting or incentive structures are distorted.
- He argues that activist shorting works better on companies that are "threes" that are actually "ones" than on stocks priced for perfection.
- Block says risk management starts with target selection, including borrow availability, short interest, and whether the trade is big enough to justify legal costs.
- He says the firm must stay adaptable because the market, and especially communication channels, have changed dramatically since 2010.
- Block warns there is a "very real possibility" that at least 15% of knowledge workers lose their jobs within 3 years if AI disruption accelerates.
Notable quotes
“I can actually make a decent living for saying the kind of things out loud that always used to get me like suspended from school”
“what good is it to tell people about these frauds if nobody's going to expose these frauds”
“the beall end all of shortelling is getting access to stock borrow”
“risk management starts with is it worth our while looking at this”
“you need to see the world the way it is, not the way that it should be”
How the episode opens
And so I I suddenly felt like, wow, in this hedge fund world, I can actually make a decent living for saying the kind of things out loud that always used to get me like suspended from school, you know, the the adult versions of that.
Hi, this is Wendy Lee, co-founder of Ivy Invest. Welcome to this week's episode of the Investment Office. As always, we're here to discuss the latest in institutional investing, private markets, and alternative assets.
We're doing something a little different this week. I'm delighted to welcome our first guest to the show, and I couldn't ask for a more interesting guest, particularly in this market environment. Carson Block is the founder of Muddy Waters, an activist investment firm.
Carson and his firm are probably best known for their due diligence reports, which have over the years uncovered a number of publicly listed frauds. I think the most recent count is 11 for the number of D-listings that your research reports have led to. Welcome to the show, Carson.
Oh, thanks for having me, Wendy. — Before we dive in, um, can you share a bit about your background? Before becoming a short seller, you were a lawyer, you were an entrepreneur in China, you co-wrote Doing Business in China for Dummies. How did you go from these experiences to building muddy waters?
Well, it's kind of hard to nutshell it, but I I will definitely do my best. Um, I did grow up in the investment industry. My father was a sellside analyst and so he got me exposed to investing very young. And the funny thing is he literally was known and I only came to appreciate this as a young adult, but he literally was known as one of the most credulous of management sellside analysts out there.
From the episode’s captions: roughly the first two minutes, lightly cleaned. Keep watching on YouTube →
Topics
- short selling framework
- short seller mistakes
- public research strategy
- risk management
- ai concerns
Companies and tickers mentioned
- Muddy Waters Capital
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Summary, takeaways and quote selection by Octagon. Quotes are short excerpts; the full conversation is in the episode.
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