Third Arc Bio closes $52 million Series A extension

4 February 2026

Pennsylvania, USA-based Third Arc Bio, a biotech company developing novel multifunctional antibodies for a range of oncology and immunology & inflammation (I&I) indications, has announced the closing of a $52 million series A extension.

This adds to the previously announced $165 million series A, with new investor Andreessen Horowitz (a16z) joining Third Arc Bio’s existing syndicate. As part of the financing, a16z general partner Jorge Conde is joining the board of directors. 

Proceeds from the financing will enable Third Arc Bio to accelerate its I&I portfolio and deliver additional oncology programs into the clinic. 

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