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SEC Filing · EFFECT

Sonnet BioTherapeutics Holdings, Inc.

SEC Filing

Filed Dec 16, 2025Accepted Dec 16, 2025, 7:15 PM ESTCIK 1106838Accession 9999999995-25-003768
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Company context

Sonnet BioTherapeutics Holdings, Inc. (“we,” “us,” “our” or the “Company”), is a clinical stage, oncology-focused biotechnology company with a proprietary platform for innovating biologic medicines of single- or bi-specific action. Known as FHAB™ (Fully Human Albumin Binding), the technology utilizes a fully human single chain antibody fragment that binds to and “hitch-hikes” on human serum albumin for transport to target tissues. We designed the construct to improve drug accumulation in specific tissues, as well as to extend the duration of activity in the body. FHAB development candidates are produced in a mammalian cell culture, which enables glycosylation, thereby reducing the risk of immunogenicity. We believe our FHAB technology, for which we received a U.S. patent in June 2021, is a distinguishing feature of our biopharmaceutical platform that is well suited for future drug development across a range of human disease areas, including in oncology, autoimmune, pathogenic, inflammatory, and hematological conditions.

Historical securities (1)

Recent company filings

  1. 10-K/A filingJul 17, 2026
  2. EFFECT filingDec 16, 2025
  3. EFFECT filingDec 16, 2025
  4. EFFECT filingDec 16, 2025
  5. EFFECT filingDec 16, 2025

As-filed source

Primary evidence