144 0001464249 XXXXXXXX LIVE 0001420520 Atomera, Inc. 001-37850 750 University Avenue, Suite 280 Los Gatos CA 95032 408-442-5248 Scott A. Bibaud Officer - CEO and President Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

9314 29437.09 31482756 09/02/2025 NASDAQ Common 09/01/2025 Vesting of Restricted Stock Issuer N 9314 09/01/2025 Granted as part of an issuer equity compensation plan N Scott Bibaud

750 University Ave Suite 280 Los Gatos CA 95032

Common 06/02/2025 9153 54938.07 Scott Bibaud

750 University Ave Suite 280 Los Gatos CA 95032

Common 06/12/2025 128002 760394.85 The shares are being sold pursuant to "sell to cover" transactions under four separate compensatory equity awards with distinct grant dates of 2/23/22, 2/23/23, 2/21/24 and 2/19/25. Each award agreement includes a provision for non-discretionary "sell-to-cover transactions" pursuant to Rule 10b5-1(c)(1)(ii)(D)(3) under the Exchange Act and each award is intended to operate as a "Rule 10b5-1 trading arrangement" as the term is defined in Item 408(a) of Regulation S-K. 09/02/2025 02/19/2025 /s/ Scott A. Bibaud