September 8, 2026, (Inside AI) — Anthropic is preparing for one of the largest initial public offerings in history. Yet the broader IPO market is already handing investors a stack of cautionary tales. The core question is simple: should retail and institutional buyers rush in, or wait for the dust to settle?
The answer may hinge on timing. Marlena Lee from Dimensional Fund Advisors told Reuters that newly listed companies typically underperform the broader market in their first year. This pattern suggests that investors may be better off waiting before buying shares in a high-profile debut like Anthropic.
Anthropic, the AI startup behind the Claude family of large language models, has not confirmed a listing date. But multiple sources say the company is laying the groundwork for a public offering that could value it well above $100 billion. That would place it among the largest tech IPOs ever, rivaling the scale of Alibaba and Facebook.
The company has raised billions from Amazon, Google, and a range of sovereign wealth funds. Its revenue has grown rapidly, driven by enterprise adoption of Claude for coding, customer support, and document analysis. Still, the path from private unicorn to public market leader is rarely smooth.
Data from academic research and market trackers shows that the median IPO underperforms the S&P 500 by a meaningful margin in the first 12 months. The reasons are structural. Insiders often sell shares after lockup periods end. Analysts initiate coverage with conservative ratings. And early hype fades as quarterly results expose the gap between narrative and execution.
Lee's warning is not an isolated view. Several fund managers have pointed to the same pattern in recent AI listings. The pattern held for many software companies that went public in 2021. Many of those stocks fell sharply in their first year, even when underlying revenue was growing.
Anthropic faces a unique set of pressures. Its costs are enormous. Training frontier models requires billions of dollars in compute. The company has not disclosed a clear path to profitability. That is not unusual for an AI lab, but public markets are less patient than venture capitalists.
Competition adds another layer of risk. OpenAI, Google DeepMind, Meta, and a wave of open-source models are all fighting for the same enterprise budgets. Anthropic has carved out a reputation for safety and reliability, but that advantage is not permanent.
IPO Timing Often Punishes Early Buyers
Historical data shows a consistent pattern. The average first-year return for IPOs is negative relative to the broader market. This is especially true for companies with high valuations and heavy media coverage before the listing. The initial pop on day one often gives way to months of selling pressure.
Lee's point about waiting is backed by simple math. If a stock falls 20% in its first year, an investor who waits can buy the same asset at a lower price. The only cost is missing a possible early rally. For most long-term investors, that trade-off favors patience.
Institutional investors have an advantage here. They can access pre-IPO rounds or negotiate anchor allocations. Retail investors do not have those options. For them, the first trade is often the worst entry point.
Anthropic's Financial Engine Is Still Unproven
Anthropic's revenue has grown fast, but so have its losses. The company spends heavily on compute, talent, and safety research. Its pricing model for Claude is competitive, but margins remain thin. Public investors will demand a clearer path to operating leverage.
There is also the question of governance. Anthropic is structured as a public benefit corporation with a long-term safety mission. That structure may limit the board's flexibility to prioritize shareholder returns. Some investors see that as a feature. Others see it as a risk.
Amazon's investment gives Anthropic access to AWS infrastructure and a massive distribution channel. Google's backing provides capital and credibility. But these relationships also create dependencies. If either partner shifts strategy, Anthropic's growth could slow.
The IPO market itself is still recovering from a multi-year slump. The 2021 class of tech IPOs left many investors with losses. The 2024 and 2025 rebounds were selective. Only companies with strong fundamentals and clear profitability attracted sustained demand.
Anthropic does not fit that profile yet. It is a high-growth, high-burn company in a capital-intensive industry. That does not mean the IPO will fail. It means the risk profile is different from a typical software listing.
Investors who believe in the long-term AI story may still want exposure. But the evidence suggests that waiting for the post-IPO lockup expiration could be a smarter move. That period often brings a wave of insider selling and a better entry price.
The decision ultimately depends on an investor's time horizon and risk tolerance. For those with a decade-long view, the first-year volatility may not matter. For those looking for a quick gain, the odds are not favorable.
Anthropic's IPO will be a major test for the AI sector. It will show whether public markets are willing to fund frontier AI research at scale. It will also reveal how much patience investors have for losses in the name of long-term dominance.
