CLRB · Cellectar Biosciences, Inc.

This option shall vest in full on July 8, 2027, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on May 28, 2026, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2026 Annual Meeting of Stockholders. Such stockholder approval was obtained on July 7, 2026.

This option shall vest over a period of three years from May 28, 2026, with 1/3 vesting on the first anniversary of May 28, 2026, and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of May 28, 2026.

This option was contingently granted on May 28, 2026, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2026 Annual Meeting of Stockholders. Such stockholder approval was obtained on July 7, 2026.

This option shall vest over a period of three years from May 28, 2026, with 1/3 vesting on the first anniversary of May 28, 2026, and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of May 28, 2026

This option shall vest in full on July 7, 2027, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest in full on July 7, 2027, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest in full on July 7, 2027, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest in full on July 7, 2027, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest in full on July 7, 2027, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on May 28, 2026, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2026 Annual Meeting of Stockholders. Such stockholder approval was obtained on July 7, 2026.

This option shall vest over a period of three years from May 28, 2026, with 1/3 vesting on the first anniversary of May 28, 2026, and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of May 28, 2026

Expiration dates are as follows: Tranche A shall have a one-year term from the date of stockholder approval; Tranche B shall have a two-year term from the date of stockholder approval; Tranche C shall have a five-year term from the date of stockholder approval.

Expiration dates are as follows: Tranche A shall have a one-year term from the date of stockholder approval; Tranche B shall have a two-year term from the date of stockholder approval; Tranche C shall have a five-year term from the date of stockholder approval.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.631 to $3.70, inclusive. The reporting person has provided to the Issuer, and undertakes to provide to any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (1) to this Form 4.

This number has been adjusted for (i) the one-for-thirty (1:30) reverse stock split effected by the Issuer on June 24, 2025, (ii) the one-for-ten (1:10) reverse stock split effected by the Issuer on July 21, 2022, and (iii) the one-for-ten (1:10) reverse stock split effected by the Issuer on July 16, 2018.

These securities are held by Advantage Capital Wisconsin Partners I, Limited Partnership. Venture Investors LLC is the submanager and special limited partner of Advantage Capital Wisconsin Partners I, Limited Partnership. The investment decisions of Venture Investors LLC are made collectively by five managers, including the reporting person. The reporting person disclaims beneficial ownership of such securities except to the extent of his pecuniary interest herein.

This number has been adjusted for the one-for-thirty (1:30) reverse stock split effected by the Issuer on June 24, 2025.

This number has been adjusted for the one-for-thirty (1:30) reverse stock split effected by the Issuer on June 24, 2025.

This number has been adjusted for the one-for-thirty (1:30) reverse stock split effected by the Issuer on June 24, 2025.

This option shall vest over a period of three years from February 14, 2025, with 1/3 vesting on the first anniversary of February 14, 2026 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of February 14, 2026.

This option shall vest in full on February 14, 2026, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest in full on February 14, 2026, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest in full on February 14, 2026, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest over a period of three years from February 14, 2025, with 1/3 vesting on the first anniversary of February 14, 2026 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of February 14, 2026.

This option shall vest in full on February 14, 2026, subject to the reporting person's continued service through the applicable vesting date.

This option shall vest over a period of three years from February 14, 2025, with 1/3 vesting on the first anniversary of February 14, 2026 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of February 14, 2026.

This option shall vest in full on February 14, 2026, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on December 22, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest in full on December 22, 2024, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on December 15, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest over a period of three years from December 15, 2023, with 1/3 vesting on the first anniversary of Decembner 15, 2023 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of Decembner 15, 2023.

This option was contingently granted on December 22, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest in full on December 22, 2024, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on December 22, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest in full on December 22, 2024, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on December 15, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest over a period of three years from December 15, 2023, with 1/3 vesting on the first anniversary of Decembner 15, 2023 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of Decembner 15, 2023.

This option was contingently granted on December 22, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest in full on December 22, 2024, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on December 15, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest over a period of three years from December 15, 2023, with 1/3 vesting on the first anniversary of Decembner 15, 2023 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of Decembner 15, 2023.

This option was contingently granted on December 15, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest over a period of three years from December 15, 2023, with 1/3 vesting on the first anniversary of Decembner 15, 2023 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of Decembner 15, 2023.

This option was contingently granted on December 22, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest in full on December 22, 2024, subject to the reporting person's continued service through the applicable vesting date.

This option was contingently granted on December 15, 2023, subject to approval by Cellectar's stockholders of Cellectar's amended 2021 Stock Incentive Plan at Cellectar's 2024 Annual Meeting of Stockholders. Such stockholder approval was obtained on June 14, 2024.

This option shall vest over a period of three years from December 15, 2023, with 1/3 vesting on the first anniversary of Decembner 15, 2023 and the remainder vesting in 24 equal monthly installments over a 24-month period beginning on the first anniversary of Decembner 15, 2023.

This stock option shall vest in full on June 28, 2024, subject to the reporting person's continued service through the applicable vesting date.

This stock option shall vest in full on June 28, 2024, subject to the reporting person's continued service through the applicable vesting date.

This stock option shall vest in full on June 28, 2024, subject to the reporting person's continued service through the applicable vesting date.

This stock option shall vest in full on June 28, 2024, subject to the reporting person's continued service through the applicable vesting date.

This stock option shall vest in full on June 28, 2024, subject to the reporting person's continued service through the applicable vesting date.