Specialized Disclosure Report (Form SD)

Conflict Minerals Report

This Conflict Minerals Report for Lattice Semiconductor Corporation is prepared pursuant to Rule 13p-1 under the Securities Exchange Act of 1934 ("Rule 13p-1") for the reporting period that ended December 31, 2025.

Lattice Semiconductor Corporation (collectively with its subsidiaries "Lattice," "we," or "our") designs, develops and markets programmable logic and connectivity solutions. Lattice has adopted a Conflict Minerals Sourcing Policy that expresses our desire to have our products be "DRC Conflict Free," meaning free from conflict minerals sourced from the Democratic Republic of the Congo and its adjoining countries ("Covered Countries") that finance or benefit armed groups. Conflict minerals are columbite-tantalite (coltan), cassiterite, gold, wolframite, and their derivatives which are limited to tantalum, tungsten, and tin, unless the Secretary of State determines that additional derivatives or minerals are financing a conflict in the Democratic Republic of the Congo or an adjoining country.

Products and Initiatives

Based on our internal assessment, our semiconductor devices that we contract to manufacture contain conflict minerals that are necessary to their functionality (the "3TG Products"). In order to seek a DRC Conflict Free supply chain and to comply with reporting requirements, we established processes designed to determine the source and chain of custody of conflict minerals in the 3TG Products. We have also adopted a Conflict Minerals Sourcing Policy and we require our suppliers to acknowledge and comply with this policy, which is available on the Corporate Stewardship page of our website at http://www.latticesemi.com/en/About/ESG.

Diligence Framework

Our due diligence strategy is consistent with the internationally recognized framework established by the Organisation for Economic Co-operation and Development Due Diligence Guidance for Responsible Supply Chains of Minerals from Conflict-Affected and High-Risk Areas, and related supplements. As part of our due diligence strategy, we established a company risk management system to support our ongoing efforts to identify, assess and respond to risks in our supply chain. Our company risk management system includes participation in industry-driven programs, including the adoption of the Responsible Business Alliance (the "RBA") Code of Conduct and our support of the third-party audits and assessments conducted in connection with the Responsible Minerals Initiative (the "RMI") Responsible Minerals Assurance Process (the "RMAP"). Because we are at least several levels removed from the mining, refining, and smelting of conflict minerals, our diligence measures can only provide a reasonable assurance regarding the source and chain of custody of conflict minerals in our supply chain. To determine the use and source of conflict minerals in our 3TG Products, we rely upon certifications from suppliers and upon the third-party assessments completed in connection with the RMAP.

As part of the RMAP, smelters are identified as "Conformant" if they have undergone an audit and are conformant with the RMAP assessment protocols. Smelters are identified as "Active" if they are participants in the RMAP and have committed to undergo an audit or are participating in another recognized certification program. These RMAP designations are an integral part of our risk management process because they provide us with independent third-party audits of the due diligence practices of the upstream smelters and refiners in our supply chain.

As part of our strategy, we conduct good faith reasonable country of origin inquiries and due diligence designed to determine whether any conflict minerals in our 3TG Products originated in the Covered Countries. We follow industry standards by requesting each supplier in our supply chain to identify the processing facilities and other data related to conflict minerals in the 3TG Products using the latest version of the RMI Conflict Minerals Reporting Template (the "CMRT"). In order to determine the source and chain of custody of any conflict minerals in our supply chain, we communicate with the relevant suppliers in our supply chain, compile, validate and analyze the CMRT results, attempt to confirm reported results where appropriate, identify possible risks, work with our suppliers to mitigate those risks, and identify smelters and refiners certified by the RMI through the RMAP. If a supplier does not respond to our requests or provides an insufficient response, we engage in further discussions with that supplier to identify and assess risks. Our policy is to disengage with any supplier where we are concerned about conflict minerals sourced from the Covered Countries that finance or benefit armed groups, which may include suppliers from whom we did not receive a sufficient response after multiple inquiries. The results of our supply chain due diligence are reported regularly to Lattice management.

Due Diligence Results

In 2025, over 94% of our product related revenues originated from semiconductor devices, and all of our suppliers of semiconductor devices provided sufficient responses to our requests. All of our suppliers of semiconductor devices provided certifications that their upstream smelters and refiners have been certified as Conformant through the RMAP.

Based on the information provided by our suppliers and as a result of our due diligence efforts for the period ended December 31, 2025, we believe that the conflict minerals contained in our 3TG Products originated from the facilities listed in Appendix I, as well as from recycled and scrap sources. Additional smelter and refinery information is contained within our CMRT, which is available upon request.

This Conflict Minerals Report was not subject to an independent private sector audit.

Appendix I

Appendix I reflects the smelters and refiners identified through Lattice's supplier-specific Conflict Minerals Reporting Template responses for the year ended December 31, 2025. Lattice notes that its Form SD filings for calendar years 2023 and 2024 included additional smelters that were not part of the Company's actual supply chain; those entries were included due to an administrative error in the smelter list compilation process and have been removed from this year's Appendix I.