In what has been described as one of the slowest, closed-window public markets in recent years, Acelyrin Inc. priced an upsized IPO, raising $540 million, the fifth highest amount for a U.S. IPO by a traditional biopharma company to date. Despite industry IPOs raising only $628 million throughout the first four months of 2023 – the lowest amount in 10 years, Acelyrin’s IPO suggests that there is still a strong investor appetite ready and waiting for innovative technologies with solid data.