Muddy Waters’ Carson Block on How AI Could Unwind the S&P 500 | #640

Episode Summary

Executive Summary: Carson Block discusses the state of short selling, arguing that activist shorting remains viable but highly selective and not scalable. He explains how politics, weak enforcement, and crowd behavior have changed markets, then pivots to Muddy Waters’ evolving strategy: using momentum, long mining exposure, and AI-disruption hedges. He is highly skeptical of AI’s labor impact, SoFi’s accounting, and China’s investability.

Main Topics: The shrinking and changing short-selling industry (Priority: 5/5): Block says many short sellers have retired or been forced out, and that activist shorting survives because it is research-intensive, brand-driven, and only produces a few actionable opportunities each year. Market trust, enforcement, and political incentives (Priority: 5/5): The discussion covers SEC/DOJ effectiveness, regulatory overreach versus under-enforcement, and how both parties have shortcomings that make real fraud enforcement difficult. Muddy Waters’ strategic evolution (Priority: 4/5): Block explains that he has broadened beyond pure short activism into momentum investing and junior mining longs, partly to preserve business viability and exploit overlooked areas. AI as a macro and market disruptor (Priority: 5/5): He argues AI will displace a meaningful share of knowledge workers, pressure wages and consumption, and ultimately hit equity markets, credit spreads, and municipal bonds. Case study: SoFi and aggressive financial engineering (Priority: 5/5): Block details a critique of SoFi’s accounting, especially fair value marks, loan sale financing, and related-party structures that he says may support overstated earnings and asset values. China as uninvestable (Priority: 4/5): He reiterates that China lacks reliable information, has capricious policy risk, and often relies on structures that leave foreign investors exposed to significant hidden default and governance risk. Notable short campaigns and lessons from past battles (Priority: 4/5): He references major fights such as Wirecard, Groupe Casino, and Nidec as examples of how long, hostile, and politically fraught serious short cases can be.

Key Arguments: Activist short selling can work, but it is not scalable; the strategy depends on rare, deeply researched situations and a strong brand rather than high frequency. Short sellers are increasingly social-media targets, and many retail investors now cheer management teams attacking critics instead of treating scrutiny as a warning sign. Regulators are inconsistent: Democrats can over-focus on paperwork, while Republicans often weaken agencies; neither side reliably delivers substantive enforcement. AI is likely to destroy a large share of high-paid knowledge work faster than prior technological cycles because models are improving themselves and coding successors. Loss of knowledge-worker income could reduce 401(k) inflows, create negative consumption effects, and eventually pressure the largest U.S. equity indices and credit markets. Muddy Waters is adapting by adding long exposure to momentum and junior mining, areas where Block believes skepticism and research can still generate edge. SoFi’s reported economics may depend on aggressive accounting, obscure financing structures, and disclosures that may understate how its loan-sale ecosystem is supported. China remains uninvestable because investors cannot trust data quality and are exposed to unpredictable policy intervention and structurally weak VIE protections.

Data Points: Potential AI-related knowledge-worker displacement: 15% of U.S. knowledge workers within three years - Block’s estimate of near-term labor disruption from AI Muddy Waters momentum strategy return: Over 70% gross compounded - Performance of an internal S&P momentum strategy started in October 2024 Short activism publication frequency: No more than 6 times per year - Block says activist short reports are rare and must be special Muddy Waters AUM in short activism: A few hundred million USD - Scale at which the firm can still operate its activist short model SoFi’s loan day-one marks: Approximately 108 to 109 on a 100 loan - Block’s description of aggressive fair value marks on newly originated loans SoFi loan sales support price: About 106 - Referenced sale price used to support model marks SoFi financing of loan purchases: 80% to 90% of purchase consideration - Block claims SoFi’s financing subsidizes buyers of its loans SoFi secured-loan financing rate: About 5% - Rate cited for financing used in the contested structure SoFi personal-loan yield: About 13% - Yield on the loans being securitized/financed in Block’s critique SoFi disputed transaction: $312 million - Loan receivable transfer around Q3 2024, which Block says was structured to support accounting marks Potential affected EBITDA: About $1 billion - Block argues disallowing the linchpin transaction could force a major restatement Wirecard short-interest episode: First use of a European framework to protect a single share from short selling - He describes Germany suspending shorting in Wirecard after allegations surfaced Groupe Casino and Nidec battles: Years-long campaigns - Examples of prolonged short activism where the market and regulators were initially hostile

Pivotal Quotes: "Cynics always sound smarter. Optimists live in bigger houses." — Carson Block: Opening framing on skepticism versus practical investing outcomes "The dirty secret of the Akivist short selling model is that it's not scalable." — Carson Block: Explanation of why activist short selling remains niche and selective "We're not as humans gonna be able to keep up with the pace of change." — Carson Block: His thesis that AI will accelerate beyond human labor adaptation

Implications: Listeners should expect more selective activism, more use of hedges and long strategies by skeptics, and rising concern about AI-driven labor and liquidity shocks. Block’s view implies higher scrutiny of banks, fintechs, and China-linked structures, plus a future where market fragility may emerge through spreads and cash-flow stress.