NUCL · Eagle Nuclear Energy Corp.

The securities reported in Column 4 of Table I are restricted stock units ("RSU"). Each RSU represents a contingent right to receive one share of common stock, par value $0.0001 per share, of Eagle Nuclear Energy Corp. (the "Issuer"), subject to the vesting schedule and other conditions set forth in the applicable RSU award and Issuer's 2025 Equity Incentive Plan. One-third of the RSUs vested upon grant, one-third will vest on the first anniversary of the grant date, and the remaining one-third will vest on the second anniversary of the grant date, in each case subject to the reporting person's continued service with the Issuer.

Certain of the securities reported in Column 5 are RSUs, each representing a contingent right to receive one share of Common Stock, subject to the terms and conditions of the applicable RSU award agreement, including the vesting schedule set forth therein, and the Issuer's 2025 Equity Incentive Plan.

The stock options vest as follows: one-half vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer and the terms and conditions of the applicable option award agreement and the Issuer's 2025 Equity Incentive Plan.

The securities reported in Column 4 of Table I are restricted stock units ("RSU"). Each RSU represents a contingent right to receive one share of common stock, par value $0.0001 per share, of Eagle Nuclear Energy Corp. (the "Issuer"), subject to the vesting schedule and other conditions set forth in the applicable RSU award and Issuer's 2025 Equity Incentive Plan. One-half of the RSUs vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer.

Certain of the securities reported in Column 5 are RSUs, each representing a contingent right to receive one share of Common Stock, subject to the terms and conditions of the applicable RSU award agreement, including the vesting schedule set forth therein, and the Issuer's 2025 Equity Incentive Plan.

The securities reported in Column 4 of Table I are restricted stock units ("RSU"). Each RSU represents a contingent right to receive one share of common stock, par value $0.0001 per share, of Eagle Nuclear Energy Corp. (the "Issuer"), subject to the vesting schedule and other conditions set forth in the applicable RSU award and Issuer's 2025 Equity Incentive Plan. One-half of the RSUs vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer.

Certain of the securities reported in Column 5 are RSUs, each representing a contingent right to receive one share of Common Stock, subject to the terms and conditions of the applicable RSU award agreement, including the vesting schedule set forth therein, and the Issuer's 2025 Equity Incentive Plan.

The stock options vest as follows: one-third vested upon grant, one-third will vest on the first anniversary of the grant date, and the remaining one-third will vest on the second anniversary of the grant date, in each case subject to the reporting person's continued service with the Issuer and the terms and conditions of the applicable option award agreement and the Issuer's 2025 Equity Incentive Plan.

The securities reported in Column 4 of Table I are restricted stock units ("RSU"). Each RSU represents a contingent right to receive one share of common stock, par value $0.0001 per share, of Eagle Nuclear Energy Corp. (the "Issuer"), subject to the vesting schedule and other conditions set forth in the applicable RSU award and Issuer's 2025 Equity Incentive Plan. One-half of the RSUs vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer.

Certain of the securities reported in Column 5 are RSUs, each representing a contingent right to receive one share of Common Stock, subject to the terms and conditions of the applicable RSU award agreement, including the vesting schedule set forth therein, and the Issuer's 2025 Equity Incentive Plan.

The securities reported in Column 4 of Table I are restricted stock units ("RSU"). Each RSU represents a contingent right to receive one share of common stock, par value $0.0001 per share, of Eagle Nuclear Energy Corp. (the "Issuer"), subject to the vesting schedule and other conditions set forth in the applicable RSU award and Issuer's 2025 Equity Incentive Plan. One-half of the RSUs vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer.

Certain of the securities reported in Column 5 are RSUs, each representing a contingent right to receive one share of Common Stock, subject to the terms and conditions of the applicable RSU award agreement, including the vesting schedule set forth therein, and the Issuer's 2025 Equity Incentive Plan.

The stock options vest as follows: one-half vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer and the terms and conditions of the applicable option award agreement and the Issuer's 2025 Equity Incentive Plan.

The stock options vest as follows: one-half vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer and the terms and conditions of the applicable option award agreement and the Issuer's 2025 Equity Incentive Plan.

The stock options vest as follows: one-half vested upon grant and the remaining one-half will vest on the first anniversary of the grant date, subject to the reporting person's continued service with the Issuer and the terms and conditions of the applicable option award agreement and the Issuer's 2025 Equity Incentive Plan.

On April 24, 2026, Spring Valley Acquisition Sponsor II, LLC (the "Sponsor") transferred all of its 2,408,335 shares of common stock and 9,422,133 warrants (the "Securities") of Eagle Nuclear Energy Corp. (the "Issuer") to its members for no consideration. Supercycle Holdings LLC ("Supercycle") received 1,712,525 shares and 6,699,917 warrants.

The reported Securities were held directly by the Sponsor and are now held directly by Supercycle. The Sponsor and Supercycle are controlled by Mr. Christopher Sorrells. Accordingly, all of the securities held by the Sponsor and Supercycle may be deemed to be beneficially held by Mr. Sorrells. Each reporting person under this Form 4 disclaims beneficial ownership of the reported securities except to the extent of their respective pecuniary interest therein and the filing of this Form 4 shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

On April 24, 2026, Spring Valley Acquisition Sponsor II, LLC (the "Sponsor") transferred all of its 2,408,335 shares of common stock and 9,422,133 warrants (the "Securities") of Eagle Nuclear Energy Corp. (the "Issuer") to its members for no consideration. Supercycle Holdings LLC ("Supercycle") received 1,712,525 shares and 6,699,917 warrants.

Supercycle elected to limit the number of shares of common stock that may be issued to a specified threshold of 9.8% of the issued and outstanding shares of common stock (the "Blocker"). As a result of the Blocker, as of the date hereof, any attempted exercise by Supercycle of warrants in excess of the specified threshold will not be effected.

The reported Securities were held directly by the Sponsor and are now held directly by Supercycle. The Sponsor and Supercycle are controlled by Mr. Christopher Sorrells. Accordingly, all of the securities held by the Sponsor and Supercycle may be deemed to be beneficially held by Mr. Sorrells. Each reporting person under this Form 4 disclaims beneficial ownership of the reported securities except to the extent of their respective pecuniary interest therein and the filing of this Form 4 shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

The securities reported in Column 4 of Table I are restricted stock units ("RSU"). Each RSU represents a contingent right to receive one share of common stock, par value $0.0001 per share, of Eagle Nuclear Energy Corp. (the "Issuer"), subject to the vesting schedule and other conditions set forth in the applicable RSU award and Issuer's 2025 Equity Incentive Plan. One-third of the RSUs vested upon grant, one-third will vest on the first anniversary of the grant date, and the remaining one-third will vest on the second anniversary of the grant date, in each case subject to the reporting person's continued service with the Issuer.

Certain of the securities reported in Column 5 are RSUs, each representing a contingent right to receive one share of Common Stock, subject to the terms and conditions of the applicable RSU award agreement, including the vesting schedule set forth therein, and the Issuer's 2025 Equity Incentive Plan.

The stock options vest as follows: one‑third vested upon grant, one‑third will vest on the first anniversary of the grant date, and the remaining one‑third will vest on the second anniversary of the grant date, in each case subject to the reporting person's continued employment and the terms and conditions of the applicable option award agreement and the Issuer's 2025 Equity Incentive Plan.

On February 24, 2026, the Reporting Person became entitled to receive 43,873 shares of Common Stock (the "Earnout Shares") pursuant to an "earnout" provision in the Merger Agreement, in the event that the metrics described in the following footnote are satisfied during the five-year period following the closing (the "Closing Date") as contemplated in the Merger Agreement.

In the event that the dollar volume-weighted average price ("VWAP") of the Common Stock equals or exceeds $16.00 per share for twenty (20) trading days within a period of thirty (30) consecutive trading days during the period beginning on the Closing Date and ending on the five-year anniversary of the Closing Date, the Reporting Person will be entitled to receive 43,873 Earnout Shares.

Reflects the issuance by Eagle Nuclear Energy Corp. (the "Issuer") on February 24, 2026, of 314,793 shares (the "Merger Consideration") of common stock, par value $0.0001 per share (the "Common Stock"), pursuant to the Amended and Restated Agreement and Plan of Merger, dated as of September 29, 2025 (as it may be amended, supplemented, or otherwise modified from time to time, the "Merger Agreement"), by and among Spring Valley Acquisition Corp. II, the Issuer, Spring Valley Merger Sub III, Inc., Spring Valley Merger Sub II, Inc., and Eagle Energy Metals Corp. ("Eagle"). The Merger Consideration was received in exchange for 1,428,566 shares of common stock of Eagle, representing an exchange ratio of 5.8347.