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Sidewinder Therapeutics secures $137 million in Series B financing, co-led by Frazier Life Sciences and Novartis Venture Fund, to advance bispecific ADCs for cancer treatment.

PRIVATEApr 08, 2026

Amount Raised

$137 Million

Round Type

Series B

BiotechnologyHealth CareTherapeuticsBiopharma

Investors

OrbimedSamsara BiocapitalLife Sciences At Goldman Sachs AlternativesDCVC BioLongwood FundAstellas Venture ManagementAlexandria Venture InvestmentsFrazier Life SciencesNovartis Venture Fund

Description

Sidewinder Therapeutics, a biopharmaceutical company, announced an oversubscribed $137 million Series B financing to further its development of bispecific ADCs for cancer. The financing was co-led by Frazier Life Sciences and Novartis Venture Fund, with participation from several notable investors. This funding will help advance their innovative therapies into clinical development. The company aims to lead the way in next-generation treatments for difficult-to-treat cancers.

Quick answer

Sidewinder Therapeutics raised $137 Million in a Series B round, dated April 8, 2026. Investors: Orbimed, Samsara Biocapital, Life Sciences At Goldman Sachs Alternatives, DCVC Bio, Longwood Fund, Astellas Venture Management, Alexandria Venture Investments and Frazier Life Sciences.

How much did Sidewinder Therapeutics raise?
Sidewinder Therapeutics raised $137 Million in a Series B round on April 8, 2026.
Who invested in Sidewinder Therapeutics?
Orbimed, Samsara Biocapital, Life Sciences At Goldman Sachs Alternatives, DCVC Bio, Longwood Fund, Astellas Venture Management, Alexandria Venture Investments and Frazier Life Sciences are named as investors in this round.
What does Sidewinder Therapeutics do?
Sidewinder Therapeutics is a biopharmaceutical company pioneering the development of next-generation bispecific ADCs (antibody-drug conjugates) for the treatment of cancer.

Source: Fundz verified event record.

Who else raised in Therapeutics and Biopharma around the same time

Companies in the same sectors as Sidewinder Therapeutics that raised within 45 days of this round, from Fundz verified event records.

  • HCW Biologics raised $4M on May 21, 2026.
  • Citius Oncology raised $37M on May 6, 2026.
  • Windward Bio raised $165M (Funding Round) on May 5, 2026.
  • Lighthouse Pharmaceuticals raised $15M (Series A) on April 22, 2026.
  • Sparian Biosciences raised $15M (Grant) on April 13, 2026.
  • Denali Therapeutics raised $200M (Debt Financing) on March 31, 2026.

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Company Information

Company

Sidewinder Therapeutics

About

Sidewinder Therapeutics is a biopharmaceutical company pioneering the development of next-generation bispecific ADCs (antibody-drug conjugates) for the treatment of cancer. The company focuses on enhancing tumor specificity and internalization to improve therapeutic outcomes. Founded in 2023, Sidewinder's pipeline targets oncology indications with limited treatment options. It has raised a total of $162 million from a world-class investor syndicate.

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Funding Insights

What this usually means
Timeline to next round
Series B companies typically work for 15-20 months before raising new capital
Growth expectations
Series B companies are expected to scale rapidly and expand market reach

Sidewinder Therapeutics raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

145 of these a day, filtered to the companies you pick, with the decision-maker attached.

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