A pair of companies delayed their IPOs, sending a ripple of anxiety through the US market as investors wait for Anthropic PBC's hotly anticipated debut to materialize. Nuclear power services firm Holtec Nuclear Corp. and CVC Capital Partners-backed Bamboo Insurance Services Inc. postponed their initial public offerings within days of each other, citing market conditions, Bloomberg News has reported.

The decisions coincide with a quieter than expected September IPO market, with just three debuts in the typically vibrant period after the Labor Day holiday.

The delays have rattled investors awaiting Anthropic's debut.