
Just ran some numbers on historical initial public offerings (IPOs) to provide a data-driven perspective on what the future might hold for highly anticipated market debuts like SpaceX, OpenAI, and Anthropic. While the media buzz surrounding mega-tech listings often generates massive retail excitement, the historical data over the last 25 years tells a much more cautious story for the 12 months following a company’s public debut.
Data-Driven Insights: The 12-Month Post-IPO Track Record
When evaluating historical IPO performance over the past two and a half decades, the data consistently refutes the myth of guaranteed first-year gains. Financial studies reveal several critical trends regarding how companies perform in the 365 days after hitting the public markets:
- The “First-Day Pop” vs. Long-Term Reality: Historically, IPOs are known for significant first-day underpricing, giving early institutional investors an average initial “pop” of roughly 15% (Lowry et al., 2017). However, for everyday investors buying shares on the open market after day one, the subsequent 12 months frequently see a reversal of fortune.
- Systemic Underperformance: Extensive long-run historical data indicates that, on average, IPOs tend to underperform broad market benchmarks—such as the S&P 500 or industry-specific indices—during their first one to three years (Ang et al., 2006).
- The Size and Age Factors: Performance varies wildly based on a company’s maturity at the time of the listing. Smaller, younger startups exhibit severe average underperformance, with cumulative average abnormal returns dropping significantly in the first year (Siev & Qadan, 2022). Conversely, large, heavily capitalized, and older firms tend to manage the transition to public markets with far less volatility, though they still frequently lag behind established market peers in the short term (Siev & Qadan, 2022).
- The “Star Performer” Statistical Outliers: The broader average of IPO performance is heavily weighed down by a high failure rate. Statistically, the vast majority of IPOs underperform, while the overall asset class is propped up by a tiny minority (roughly 2%) of “star performers” that achieve monumental returns (Ang et al., 2006).
What This Means for upcoming IPOs such as SpaceX, OpenAI, and Anthropic:
Applying this decision-making framework to the dominant tech private giants of today yields specific strategic takeaways:
| Risk & Valuation Variable | Strategic Application to Upcoming Mega-Tech IPOs |
| Institutional Maturity | Unlike the speculative tech listings of the 1999–2000 dot-com bubble, firms like SpaceX, OpenAI, and Anthropic will enter the public markets as massive, heavily capitalized enterprises with massive global footprints. According to historical trends, their large size and operational age should structurally protect them from the extreme 40%+ drop-offs seen in smaller, speculative IPOs (Siev & Qadan, 2022). |
| The Hype Premium | Because these brands carry unprecedented cultural and technological visibility, their IPOs will likely face intense public demand. This historically leads to severe initial underpricing (to benefit institutional insiders) followed by a retail-driven valuation peak on day one, which frequently leads to a cooling-off period and negative market-adjusted returns over the subsequent 12 months. |
| The “Long Shot” Bet | Investors backing OpenAI or Anthropic are implicitly betting that these firms will become the absolute “star outliers” of the decade (Ang et al., 2006). While the historical probability of any random IPO becoming a permanent market leader is low, companies with profound structural moats stand the best statistical chance of breaking the traditional 12-month underperformance trend. |
The historical data over the last 25 years sends a clear warning to investors: buying into the immediate 12-month aftermath of a high-profile tech IPO is statistically a losing proposition compared to holding a broad-market index. While mega-cap innovators like SpaceX or OpenAI possess the scale to avoid the catastrophic first-year collapses of smaller startups, history dictates that the safest, most optimized administrative path for retail capital is often patience—waiting for the initial regulatory, insider lockup, and hype cycles to clear before establishing a long-term position.
Please comment or send an email if you have any questions.
Joe Baker, CFP®
Baker Asset Management, LLC
joebaker@bakerassetmanagement.com
References
Ang, A., Gu, L., & Hochberg, Y. V. (2006). Is IPO underperformance a peso problem? National Bureau of Economic Research. https://doi.org/10.3386/w12203
Cited by: 81
Lowry, M., Michaely, R., & Volkova, E. (2017). Initial Public Offerings: A synthesis of the literature and directions for future research. Foundations and Trends® in Finance, 11(3-4), 154-320. https://doi.org/10.1561/0500000050
Cited by: 334
Siev, S., & Qadan, M. (2022). Call me when you grow up: Firms’ age, size, and IPO performance across sectors. Journal of Risk and Financial Management, 15(12), 586. https://doi.org/10.3390/jrfm15120586
Cited by: 19


