Gossamer Bio to File Seralutinib NDA in September, Forte Biosciences Acquired by argenx

EarningsCorporate Action Impact 4
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Summary · why it matters

Gossamer Bio plans to submit a New Drug Application for Seralutinib to treat pulmonary arterial hypertension in September 2026, while Forte Biosciences has agreed to be acquired by argenx for $77 per share in cash, representing a total equity value of roughly $2.2 billion. Gossamer also regained worldwide rights to Seralutinib from Chiesi and reported cash of approximately $57 million as of June 30, 2026. Entera Bio shares soared over 90% after announcing an oversubscribed private placement expected to generate about $275 million in gross proceeds. Omeros gained more than 15% after AstraZeneca's Ultomiris failed a Phase 3 trial for HSCT-TMA, removing a key competitive threat to Omeros's YARTEMLEA. First Tracks Biotherapeutics rose over 18%, continuing its strong performance since its April 2026 Nasdaq debut.

Impact on stocks 8

Biotech & Genomic Medicine± Mixed · 5 stocks
AstraZeneca PLC
AZN
▼ NegativeTechnologyrelevance

AstraZeneca's Ultomiris failed a Phase 3 trial for HSCT-TMA, a clinical setback.

Forte Biosciences Inc
FBRX
▲ PositiveCapitalrelevance

Forte Biosciences agreed to be acquired by argenx for $77 per share in cash, a premium to market.

Omeros Corporation
OMER
▲ PositiveCompetitionrelevance

AstraZeneca's Ultomiris failed a Phase 3 trial, removing a key competitive threat to Omeros's YARTEMLEA.

Health Care · 3 stocks
argenx NV ADR
ARGX
▲ PositiveCapitalrelevance

argenx is acquiring Forte Biosciences for $77 per share, expanding its pipeline.

Gossamer Bio Inc
GOSS
▲ PositiveRegulationrelevance

Gossamer Bio plans to file NDA for Seralutinib in September 2026, a key regulatory milestone.

Theme Impact 2

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