Zosano Pharma Corporation (ZSANQ), a clinical-stage biopharmaceutical company founded in 2006 and headquartered in Fremont, California, develops proprietary transdermal microneedle systems for the rapid systemic administration of therapeutics and bioactive molecules, including peptides, small water-soluble molecules, monoclonal antibodies, and vaccines; its lead product candidate, Qtrypta (M207), comprises a zolmitriptan formulation delivered via microneedle array for the acute treatment of migraine in patients experiencing moderate to severe headache pain, nausea, photophobia, and phonophobia. The company targets central nervous system disorders and other indications requiring fast-onset drug delivery to address unmet needs unmet by oral or injectable therapies, with operations focused in the United States. In June 2022, Zosano filed for voluntary Chapter 11 reorganization in the U.S. Bankruptcy Court for the District of Delaware to pursue restructuring amid financial challenges; by December 2022, it completed Chapter 11 liquidation proceedings and ceased operations.