Exhibit 99.1 Amprius Technologies Reports First Quarter 2026 Financial Results and Recent Business Highlights FREMONT, Calif. — May 7, 2026 – Amprius Technologies, Inc. ("Amprius" or the "Company") (NYSE: AMPX), a leader in silicon anode lithium-ion batteries, today announced financial results for the first quarter ended March 31, 2026, and discussed recent business developments. Revenue for the first quarter of 2026 was $28.5 million, up 2.5x from $11.3 million in the first quarter of 2025. Net loss was $5 ...