SNGX · Soligenix, Inc.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 11, 2025.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 11, 2025.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 11, 2025.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 11, 2025.

This transaction was executed in multiple trades at prices ranging from $1.32 to $1.325. The price reported above reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected.

The stock option vests ratably on each of September 20, 2025, December 20, 2025, March 20, 2026 and June 20, 2026.

The stock option vests ratably on each of September 20, 2025, December 20, 2025, March 20, 2026 and June 20, 2026.

The stock option vests ratably on each of September 20, 2025, December 20, 2025, March 20, 2026 and June 20, 2026.

The stock option vests ratably on each of September 20, 2025, December 20, 2025, March 20, 2026 and June 20, 2026.

The stock option vests ratably on each of March 12, 2025, June 12, 2025, September 12, 2025 and December 12, 2025.

The stock option vests ratably on each of March 15, 2024, June 15, 2024, September 15, 2024 and December 15, 2024.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 12, 2024.

The stock option vests ratably on each of March 12, 2025, June 12, 2025, September 12, 2025 and December 12, 2025.

The stock option vests ratably on each of March 12, 2025, June 12, 2025, September 12, 2025 and December 12, 2025.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 12, 2024.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 12, 2024.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 12, 2024.

The stock option vests ratably on each of March 15, 2024, June 15, 2024, September 15, 2024 and December 15, 2024.

The stock option vests ratably on each of March 15, 2024, June 15, 2024, September 15, 2024 and December 15, 2024.

The stock option vests ratably on each of March 15, 2024, June 15, 2024, September 15, 2024 and December 15, 2024.

The stock option vests ratably on each of March 15, 2024, June 15, 2024, September 15, 2024 and December 15, 2024.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 8, 2023.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 8, 2023.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 8, 2023.

The stock option vested immediately as to 25% of the shares and vests as to the remaining 75% of the shares in 12 equal installments (or nearly equal installments if the number of remaining shares is not evenly divisible by 12) on each three (3) month anniversary of December 8, 2023.

The stock option vested immediately as to 20,000 shares and vests as to the remainder at a rate of 5,000 of the shares on each three (3) month anniversary of December 8, 2022.

The stock option vested immediately as to 20,000 shares and vests as to the remainder at a rate of 5,000 of the shares on each three (3) month anniversary of December 8, 2022.

The stock option vested immediately as to 20,000 shares and vests as to the remainder at a rate of 5,000 of the shares on each three (3) month anniversary of December 8, 2022.

The stock option vested immediately as to 35,000 shares and vests as to the remainder at a rate of 8,750 of the shares on each three (3) month anniversary of December 8, 2022.

The stock option vests ratably on each of February 17, 2023, May 17, 2023, August 17, 2023 and November 17, 2023.

The stock option vests ratably on each of February 17, 2023, May 17, 2023, August 17, 2023 and November 17, 2023.

The stock option vests ratably on each of February 17, 2023, May 17, 2023, August 17, 2023 and November 17, 2023.

The stock option vests ratably on each of February 17, 2023, May 17, 2023, August 17, 2023 and November 17, 2023.

This transaction was executed in multiple trades at prices ranging from $0.4300 to $0.4470. The price reported above reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected.

The terms of the stock option provide that it is to vest immediately as to 12,500 shares and to vest as to the remainder at a rate of 3,125 of the shares every three months, beginning on March 12, 2022; provided, however, that, consistent with the 2015 Equity Incentive Plan (the "Plan") and the rules of the Nasdaq Stock Market, such stock option shall not be exercisable nor shall it vest prior to the time when an amendment increasing the number of shares authorized for issuance under the Plan is approved by the stockholders, and provided further that, if such approval has not been obtained within 12 months of the grant date, the stock option shall thereupon be canceled and become null and void. The reporting person voluntarily agreed to cancel the stock option granted December 9, 2021 with respect to 50,000 shares.

The terms of the stock option provide that it is to vest immediately as to 11,829 shares and to vest as to the remainder at a rate of 2,958 of the shares every three months, beginning on April 3, 2022; provided, however, that, consistent with the 2015 Equity Incentive Plan (the "Plan") and the rules of the Nasdaq Stock Market, such stock option shall not be exercisable nor shall it vest prior to the time when an amendment increasing the number of shares authorized for issuance under the Plan is approved by the stockholders, and provided further that, if such approval has not been obtained within 12 months of the grant date, the stock option shall thereupon be canceled and become null and void. The reporting person voluntarily agreed to cancel the stock option granted January 3, 2022 with respect to 47,315 shares.

The stock option vested immediately as to 15,000 shares and vests as to the remainder at a rate of 3,750 of the shares on each three (3) month anniversary of January 3, 2022.

This transaction was executed in multiple trades at prices ranging from $0.7399 to $0.74. The price reported above reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected.

This transaction was executed in multiple trades at prices ranging from $0.7235 to $0.727. The price reported above reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected.

The stock option vested immediately as to 17,500 shares and vests as to the remainder at a rate of 4,375 of the shares on each three (3) month anniversary of December 9, 2021.

The stock option vested immediately as to 15,000 shares and vests as to the remainder at a rate of 3,750 of the shares on each three (3) month anniversary of December 9, 2021.

The stock option vested immediately as to 12,500 shares and vests as to the remainder at a rate of 3,125 of the shares on each three (3) month anniversary of December 9, 2021.

The stock option vested immediately as to 10,000 shares and vests as to the remainder at a rate of 2,500 of the shares on each three (3) month anniversary of December 9, 2021.

The stock option vests ratably on each of December 23, 2021, March 23, 2022, June 23, 2022 and September 23, 2022.

The stock option vests ratably on each of December 23, 2021, March 23, 2022, June 23, 2022 and September 23, 2022.

The stock option vests ratably on each of December 23, 2021, March 23, 2022, June 23, 2022 and September 23, 2022.