Episode 406: When Massive Private Companies Go Public
The Rational Reminder Podcast · 2026-04-23 · 1h 11m
Episode notes
In this episode, the Rational Reminder team unpacks the mechanics and implications of mega IPOs like SpaceX, OpenAI, and Anthropic potentially entering public indices. They explore how index funds handle IPO inclusion, why newly public stocks tend to underperform, and how structural features of indexing can lead to systematically buying high and selling low. The conversation dives into academic research on IPO returns, the role of free float in index construction, and how evolving market dynamics are forcing index providers to reconsider long-standing rules. They also examine alternative approaches from firms like Dimensional and Avantis, and whether investors are truly missing out by not accessing private markets. This episode blends market structure, empirical evidence, and investor behaviour into a nuanced look at one of the most talked-about investing topics today. Key Points From This Episode: (0:00:04) Introduction to the Rational Reminder Podcast and hosts. (0:00:19) PWL Capital expands to Vancouver through partnership with Macdonald Shymko & Company. (0:03:45) Main topic: "Mega IPOs" and concerns about index fund exposure.