×

Retension Pharmaceuticals, TRex Bio file for US IPO as biotech momentum continues

By Thomson Reuters Sep 18, 2026 | 5:27 PM

Sept 18 (Reuters) – Drug developers Retension Pharmaceuticals and TRex Bio filed their paperwork for U.S. initial public offerings on Friday, reinforcing the biotech pipeline for the fall IPO ​window.

The listings would be the latest in a string ‌of biotech IPOs this year, which analysts say has been supported by a wave of acquisitions by large drugmakers.

They will also add breadth to the IPO pipeline for the fall window, which has kicked off on a ‌shaky ​note.

“Biotech IPOs tend to be more resistant ⁠to the macro headwinds ⁠affecting other sectors, like the Iran war or AI disruption,” said Matt Kennedy, senior ‍strategist at Renaissance Capital, a provider of IPO-focused research and ETFs.

Drug developer Electra Therapeutics debuted on Friday ​after raising $350 million in an upsized U.S. IPO. Its shares closed down 11.7%.

Kennedy said biotech IPOs will come under more ⁠scrutiny given Electra’s decline.

“They may no ⁠longer get a free pass. But broadly speaking, this ​sector has been a winner for IPO investors,” he added.

South San ​Francisco, California-based TRex is developing medicines to restore immune ‌balance and promote tissue repair in patients with autoimmune and inflammatory diseases.

Its most advanced product candidate, TRB-061, is being developed in a early-stage clinical trial for a variety of autoimmune and inflammatory ⁠diseases. Data from the trial is expected in mid-2027.

Drugmaker Eli Lilly plans to invest in TRex’s IPO, according to its prospectus.

Separately, Falls Church, ⁠Virginia-based Retension is ‌developing medicines to treat hypertension and other cardiovascular ⁠diseases.

RTN-001, the company’s only product candidate, has shown ​significant ‌reductions in blood pressure in two mid-stage trials.

J.P. ​Morgan, Evercore ⁠ISI, Cantor, Stifel and Wedbush PacGrow are the underwriters for TRex’s offering.

Leerink Partners, Guggenheim Securities, Oppenheimer and Titan Partners are the underwriters for Retension’s offering.

Retension and TRex will list on the Nasdaq under the symbols “RTSN” and “TRXB”, respectively.

(Reporting by Arasu Kannag Basil in Bengaluru; Editing ​by Tasim Zahid)