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Sidley Represents RA Capital Management in Artios Pharma’s US$115 million Series D Funding

November 20, 2025

Sidley represented RA Capital Management as co-lead investor in relation to Artios Pharma Limited’s (Artois) US$115 million Series D financing. Artios is a biopharmaceutical company developing next-generation approaches in the DNA damage response (DDR) field ttrough its comprehensive anti-cancer approach and the deep experience of its team of DDR drug developers.

The company’s clinical-stage candidates, ATR inhibitor alnodesertib and DNA Polymerase theta (Polθ) inhibitor ART6043, as well as its pre-clinical programs, including DDRi-ADCs, are designed with differentiated pharmaceutical properties and novel biological approaches to precisely eliminate a cancer cell’s remaining survival mechanisms. Artios’ mission is to develop new classes of medicines that exploit DDR pathways with the aim of improving outcomes for patients with hard-to-treat cancers.

The Sidley team was led by Private Equity partner Robert Darwin (London), supported by Ying Liu, managing associate (London); and Nicolas Gomez Ospina, associate (London).

Contacts

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*Only admitted to practice in New York. Not admitted to practice in England and Wales.
Only admitted to practice in New York and Colombia. Not admitted to practice in England and Wales.