Amendment No. 5 to Schedule 13D for Rare Element Resources Ltd.

This filing, Amendment No. 5 to Schedule 13D, concerns Rare Element Resources Ltd. (the "Issuer") and its Common Stock. The filing is made by Synchron, General Atomic Technologies Corporation (GATC), Tenaya Corporation, and James N. Blue (collectively, the "Reporting Persons"). Synchron has acquired a significant stake in the Issuer through various transactions, including an initial investment agreement in 2017, exercise of an option in 2019, participation in rights offerings in 2021 and 2024, and most recently, a subscription in the 2026 Rights Offering. As of March 10, 2026, Synchron beneficially owns approximately 71.4% of the Issuer's outstanding Common Shares, holding 460,889,576 shares. The Reporting Persons have not engaged in any other transactions involving the Issuer's securities in the last 60 days. The filing details the sources of funds for these transactions, primarily from Synchron's available cash. James N. Blue is a U.S. citizen, and none of the Reporting Persons have been convicted in criminal proceedings or involved in certain civil proceedings in the last five years.