The market for new biotech stock offerings is heating up, but the optimism comes with strings attached.

According to BioPharma Dive, investors and life sciences bankers gathered at BIO's annual meeting predicted an acceleration in biotech initial public offerings (IPOs) later this year. The sentiment, captured in interviews and an on-stage panel, was summed up by one phrase: "the window's open."

An IPO is the moment a private company sells shares to the public for the first time, raising cash to fund its work — for drug developers, that often means bankrolling years of expensive clinical trials. When the "window" is open, it means public investors are willing to buy in, giving startups a path to the money they need.

But BioPharma Dive reports an important caveat: the expected wave of offerings will not lift all companies. Bankers and investors said the acceleration would benefit only those fitting "a certain criteria" — in other words, the market is reopening selectively rather than throwing its doors open to every biotech hoping to go public.

The reporting frames this as investors "taking stock" of a growing class of biotech IPOs, suggesting enough deals have already emerged to let the industry assess how this new crop is performing.

Why it matters: Biotech runs on access to capital, and a reopening IPO window — even a narrow one — signals which drug developers can raise the funding to keep their research moving and which may still be left waiting.