Ainscow Robert

SEC source: 0001477932-26-005431 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,256,879

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 13, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.75 to $3.96, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-26-003753 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,281,879

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.785 to $7.265, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-26-003632 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,290,317

F1 · date: This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant date.

F1 · price: This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant date.

SEC source: 0001477932-26-002390 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,490,317

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.055 to $5.52, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-26-001231 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,537,817

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.00 to $5.65, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-26-002188 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,512,817

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 13, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.42 to $4.58, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-008938 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Interim CEO and COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,546,255

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.03 to $6.525, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-008682 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Interim CEO and COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,554,693

F1 · kind: Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on December 13, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.54 to $6.015, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-008506 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Interim CEO and COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,579,693

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.215 to $7.85, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-007626 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Interim CEO and COO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,647,193

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.31 to $14.46, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-006620 · form4.xml · derivative · entry 10

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 135,000 shares

Expires 2032-06-10

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: These options vested in thirty-six equal installments beginning on the last day of month after the option's grant date. The option was granted on June, 10, 2022.

SEC source: 0001477932-25-006620 · form4.xml · derivative · entry 9

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,000 shares

Expires 2032-04-04

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options vested in a single installment 12 months after the grant date. The option was granted on April 4, 2022.

SEC source: 0001477932-25-006620 · form4.xml · derivative · entry 8

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 150,000 shares

Expires 2031-10-04

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: These options vested in thirty-six equal installments beginning on the last day of month after the option's grant date. The option was granted on October 4, 2021.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 7

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,669,693

F3 · kind: Represents shares withheld by the Company in connection with net share settlement to satisfy the exercise price associated with the reporting person's exercise of employee stock options. No shares were sold by the reporting person to satisfy the exercise price or any tax liability.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 6

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,701,345

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 5

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,566,345

F3 · kind: Represents shares withheld by the Company in connection with net share settlement to satisfy the exercise price associated with the reporting person's exercise of employee stock options. No shares were sold by the reporting person to satisfy the exercise price or any tax liability.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 4

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,569,158

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 3

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,557,158

F3 · kind: Represents shares withheld by the Company in connection with net share settlement to satisfy the exercise price associated with the reporting person's exercise of employee stock options. No shares were sold by the reporting person to satisfy the exercise price or any tax liability.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 2

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,564,554

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001477932-25-006620 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,411,554

F1 · kind: Represents "sell to cover" sales effected pursuant to a Rule 10b5-1 trading plan adopted by the filing person on June 9, 2025 to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.31 to $8.79, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-002834 · form4.xml · nonDerivative · entry 3

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,419,992

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Robert Ainscow dated December 13, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.25 to $6.02, inclusive. The reporting person undertakes to provide the Company, any stockholder of the Company, 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 4.

SEC source: 0001477932-25-002834 · form4.xml · nonDerivative · entry 2

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,486,660

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Robert Ainscow dated December 13, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.26 to $5.70, inclusive. The reporting person undertakes to provide the Company, any stockholder of the Company, 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 3.

SEC source: 0001477932-25-002834 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,553,326

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Robert Ainscow dated December 13, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.48 to $6.70, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, 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 2.

SEC source: 0001477932-25-002718 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,619,992

F1 · date: This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant date.

F1 · price: This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant date.

SEC source: 0001477932-24-005650 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,219,992

F1 · date: This award of common stock shall vest (subject to compliance with applicable vesting conditions) in equal quarterly installments over a four-year period beginning on the grant date.

F1 · price: This award of common stock shall vest (subject to compliance with applicable vesting conditions) in equal quarterly installments over a four-year period beginning on the grant date.

SEC source: 0001477932-24-004209 · form4.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 919,992

F1 · date: Represents shares of Common Stock purchased by the reporting person at the public offering price of $2.50 per share in connection with the issuer's underwritten public offering of Common Stock, which closed on July 15, 2024.

F1 · price: Represents shares of Common Stock purchased by the reporting person at the public offering price of $2.50 per share in connection with the issuer's underwritten public offering of Common Stock, which closed on July 15, 2024.

SEC source: 0001477932-23-001111 · primary_doc.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 900,000

F1 · deemedExecutionDate: On December 30, 2022, the Company issued 50,000 shares of the Company's restricted common stock to Robert Ainscow as a bonus for services provided during the fiscal year ended December 31, 2022.

SEC source: 0001213900-22-073086 · ownership.xml · nonDerivative · entry 1

Ainscow Robert · CIK 0001951275 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 850,000

F1 · deemedExecutionDate: This special one-time equity award of 600,000 restricted shares was contingent upon the completion of our IPO. Mr. Ainscow will receive 150,000 restricted shares of our common stock on November 15, 2023, 150,000 restricted shares of our common stock on November 15, 2024, 150,000 restricted shares of our common stock on November 15, 2025, and 150,000 shares of our restricted common stock on November 15, 2026.