Overview
Capital Economics cautioned that the current wave of mega‑IPOs could be a warning sign for the stock market, noting that historically a surge in equity supply aligns with the late stages of major equity booms. The firm’s Markets Economist, Joe Maher, highlighted that gross equity issuance typically accelerates markedly during market expansions and peaks near the end of such cycles.
Equity Issuance Data
Data released this week showed net equity issuance by U.S. non‑financial corporations turned positive in the first quarter of 2026, marking the first quarterly positive net issuance since the second quarter of 2021.
Mega IPOs and Expected Capital Raises
- SpaceX is preparing an IPO that aims to raise approximately $80 billion, the largest IPO on record.
- Anthropic and OpenAI, slated to list later in 2026, together with SpaceX, are targeting a combined raise of around $200 billion.
- Only about 5 % of SpaceX’s shares will be floated initially, with similar free‑float levels suggested for Anthropic and OpenAI. Capital Economics estimates that if the free‑float proportion were to increase to 25 %, an additional ~$750 billion of equity could enter the market as lock‑up periods expire.
Share Sales by AI Hyperscalers
Capital Economics also flagged that Alphabet plans to raise $80 billion through secondary share sales, and reports indicate that Meta may follow suit. These moves reflect AI‑focused hyperscalers seeking financing alternatives to debt‑funded capital spending.
Historical Context and Outlook
The firm concluded that recent history suggests a surge in share issuance typically signals that the end of an equity boom is a matter of months rather than years. Gross issuance has historically peaked in line with the stock market at the close of the last three major booms.
Implications
If the projected equity supply materialises, the market could face a substantial increase in available shares, potentially exerting downward pressure on valuations and signalling a transition toward the next market cycle.