Flare Therapeutics closes $85M Series C, names Anna Protopapas CEO

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Summary · why it matters

Flare Therapeutics has closed an $85 million Series C financing led by existing investors Third Rock Ventures and Nextech Invest, with participation from Pfizer Ventures, Boxer Capital, GordonMD Global Investments, Invus, Casdin Capital, Eli Lilly and Company, Novartis, Agent Capital and Eventide Asset Management. The company also appointed Anna Protopapas as Chief Executive Officer. Proceeds will advance FX-111, a first-in-class degrader targeting the transcriptionally active androgen receptor ARON for prostate cancer, toward proof of concept, with an IND already cleared and clinical development expected to start in the third quarter of 2026. FlareTx is also progressing an ARON RIPTAC program through preclinical development, while its Phase 1B asset FX-909 will be advanced through an external partnership. Protopapas, who joined the board in February 2025 and became Chair in September 2025, previously served as CEO of Mersana Therapeutics and President of Millennium at Takeda.

Impact on assets 3

Biotech & Genomic Medicine▲ · 3 stocks

Theme Impact 1

Off-coverage companies 10

Flare Therapeutics Inc.Private▲ Positive
Capitalrelevance

Flare Therapeutics closed an $85M Series C financing, providing capital to advance its pipeline.

Agent CapitalPrivate± Mixed
relevance

Boxer CapitalPrivate± Mixed
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Casdin CapitalPrivate± Mixed
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Eventide Asset ManagementPrivate± Mixed
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GordonMD Global Investments LPPrivate± Mixed
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Mersana TherapeuticsPrivate± Mixed
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Nextech Invest Ltd.Private± Mixed
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Pfizer VenturesPrivate± Mixed
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Third Rock Ventures LLCPrivate± Mixed
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