Attovia Therapeutics (ATTO) sets $289 million IPO with 17 million shares
As seen on the 24/7 Wall St. homepage on August 4, 2026.
Attovia sets $289 million IPO size ahead of Nasdaq debut
Attovia's second S-1 amendment locks in a 17 million share deal sized at $289 million, one of the larger biotech listings to reach this stage this year. Morgan Stanley, Leerink, Citigroup, RBC and LifeSci are running the book, so pricing is the next milestone to watch.
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Attovia Therapeutics filed its second S-1 amendment with the SEC, locking in an offering of 17 million shares priced to raise $289 million — making it one of the larger biotech IPOs to reach this stage in 2026. The amended filing moves the deal meaningfully closer to an actual Nasdaq debut under the ticker ATTO, with pricing now the key milestone standing between Attovia and the public markets.
The syndicate assembled for the deal is a heavyweight one: Morgan Stanley, Leerink Partners, Citigroup, RBC Capital Markets, and LifeSci Capital are all running the book. That breadth of coverage signals the company is targeting a wide range of institutional buyers, from large generalist funds to the specialist life-science investors that Leerink and LifeSci typically bring to biotech deals.
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For investors tracking the IPO pipeline, the next event to watch is formal pricing, which will set the per-share price and confirm whether demand supports the full $289 million raise. Until that number is set, the deal size and share count from the amended S-1 represent the company's stated target rather than a final outcome.
Mentioned: ATTO