Exhibit 99.1 Optinose Reports Fourth Quarter and Full Year 2023 Financial Results and Recent Operational Highlights PDUFA target action date is March 16, 2024, for the Company's sNDA. If approved, the Company is prepared for launch of XHANCE for treatment of patients diagnosed with chronic sinusitis Physicians diagnose chronic sinusitis 10 times more frequently than XHANCE’s current nasal polyps indication and there is no FDA-approved medication for these patients Company reports fourth quarter and full yea ...