Eton Pharmaceuticals presents at Piper Sandler conference; no new material facts disclosed

Eton Pharmaceuticals, Inc.

Management attending Piper Sandler Annual Healthcare Conference on December 4, 2025 in New York.
Corporate slide presentation furnished as Exhibit 99.1; content not provided in this filing.
No financial or operational updates communicated beyond standard investor presentation.
Event is routine investor outreach; no specific numbers or guidance changes reported.

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