Ian Cassel – Investing In Tiny Stocks - [Invest Like the Best, EP.24]

Episode Summary

Executive Summary: Patrick O'Shaughnessy interviews microcap investor Ian Castle about intelligent fanatics, why microcaps can be inefficient and fertile ground for alpha, and how concentrated, long-term, founder-focused investing can work in tiny public markets.

Main Topics: Intelligent fanatics (Priority: 10/5): Castle defines exceptional founders who sustain advantage for decades through vision, culture, and relentless improvement. Why microcaps matter (Priority: 9/5): He argues microcaps are overlooked, economically important, and full of opportunity because many investors cannot access them. Liquidity and inefficiency (Priority: 10/5): He says illiquidity, not size alone, drives inefficiency and creates pricing dislocations in microcaps. His investment process (Priority: 9/5): Castle uses deep reading, direct management contact, and a high hurdle rate rather than formal screens or heavy modeling. Portfolio construction and valuation (Priority: 8/5): He prefers concentrated portfolios, long holding periods, clean balance sheets, and buying early undervaluation before re-rating. Frugality and career path (Priority: 7/5): He explains how personal frugality and a desire for autonomy shaped his full-time private-investor lifestyle.

Key Arguments: Microcaps are inefficient because larger capital cannot enter illiquid names. Illiquidity predicts returns better than size; small illiquid companies outperformed in Ibbotson's research. Founder ownership and domination of a niche help validate both moat and management quality. He avoids capital-intensive sectors because dilution risk is too high for small companies. Concentrated ownership lets him know positions better and hold through volatility. He prefers companies that can grow earnings 30% and still rerate as discovery expands.

Data Points: North American public companies: approximately 20,000 - Total public-company universe referenced by Castle Microcap share of public companies: roughly half - Castle estimates about half of North American public companies are microcaps Microcap company count: around 10,000 - Castle's estimate of microcap public companies in North America Combined market cap of all microcaps: about the size of Google / about $550 billion - He compares the aggregate microcap universe to one mega-cap company Jobs supported by microcaps: around 2.8 million - Castle cites total employment across the microcap universe Small illiquid company return: 17.8% - Castle cites Roger Ibbotson research since 1972 on best-performing category Microcaps under $50 million: 7,000 companies - He says this sub-universe still exceeds NYSE + NASDAQ company count combined Largest current position holding period: since 2010 - Castle's largest current holding date of first purchase Second largest current position holding period: since 2012 - Castle's second-largest current holding date of first purchase Initial position sizing target: best four or five or six companies - He says he is a highly concentrated investor Founder ownership threshold: 20% plus - He prefers management teams owning at least 20% of the business Target stock count in holding period: four main reasons to sell - He outlines four primary sell reasons rather than relying on turnover rules Management buy-in example valuation: 30% growth at 10 PE - He is willing to pay up if growth can re-rate the multiple Ideal upside on discovery: at least 50% - He wants enough mispricing to allow a meaningful return before the market recognizes the story

Pivotal Quotes: "The throbbing heart of a business is the intense desire to do better." — John Patterson: Patrick reads the quote as the episode's opening example of an intelligent fanatic "The best performing area to be in as a whole was small, illiquid companies." — Ian Castle: He cites research to explain why microcaps can be fertile for returns "I would rather live on the street than have to get work for anybody ever again." — Ian Castle: He explains the intensity and independence that drove him to full-time investing

Implications: Listeners should focus on understanding a few businesses deeply; the unresolved question is which microcaps deserve conviction before the crowd notices them.