X0202 SCHEDULE 13D/A 0001990517 XXXXXXXX LIVE 6 Common Stock, $0.01 par value 06/15/2026 false 0001389545 66987P508 Stablecoin Development Corp

2000 POWELL STREET, SUITE 1150 EMERYVILLE CA 94608

R01 FUND LP 305-982-7994 1111 Lincoln Road, Suite 500 Miami Beach FL 33139 0001990517 N R01 Fund LP a WC N DE 0.00 33404510.00 0.00 33404510.00 33404510.00 N 46.9 PN This Amendment No. 6 is being filed to update the beneficial ownership of the Reporting Persons to reflect the exercise in full of the 11,332,020 shares of Common Stock issuable upon the exercise of the pre-funded warrants issued by the Issuer to R01 Fund LP and other investors on October 16, 2025 (the "Pre-Funded Warrants," and such shares issuable upon their exercise, the "Warrant Shares"). The Reporting Persons paid the exercise price on a cashless basis, resulting in the withholding of 24,720 of the Warrant Shares to pay the exercise price and issuing to the Reporting Persons the remaining 11,307,300 Warrant Shares. The percentage calculation set forth above is based on 27,835,180 shares of common stock outstanding as of June 15, 2026 and also contemplates the cashless exercise of 11,332,020 shares of Common Stock underlying the Pre-Funded Warrants issued by the Issuer to Framework Ventures IV L.P., Framework Ventures Management LLC, Framework Ventures IV GP LLC, Vance Spencer and Michael Ernest Anderson, each of which or whom are considered to be in a "group" with R01 Fund LP, R01 Capital LLC, R01 Capital Manager LLC and Kazley for purposes of Rule 13d-3 under the Exchange Act. The reported securities may also be deemed to be beneficially owned by R01 Capital LLC, R01 Capital Manager LLC and Michael Kazley, each of which or whom disclaims beneficial ownership of such shares, except to the extent of its or his pecuniary interest therein. 0002091715 N R01 Capital LLC a WC N DE 0.00 33404510.00 0.00 33404510.00 33404510.00 N 46.9 OO This Amendment No. 6 is being filed to update the beneficial ownership of the Reporting Persons to reflect the exercise in full of the 11,332,020 shares of Common Stock issuable upon the exercise of the pre-funded warrants issued by the Issuer to R01 Fund LP and other investors on October 16, 2025 (the "Pre-Funded Warrants," and such shares issuable upon their exercise, the "Warrant Shares"). The Reporting Persons paid the exercise price on a cashless basis, resulting in the withholding of 24,720 of the Warrant Shares to pay the exercise price and issuing to the Reporting Persons the remaining 11,307,300 Warrant Shares. The percentage calculation set forth above is based on 27,835,180 shares of Common Stock outstanding as of June 15, 2026 and also contemplates the cashless exercise of 11,332,020 shares of Common Stock underlying the Pre-Funded Warrants issued by the Issuer to Framework Ventures IV L.P., Framework Ventures Management LLC, Framework Ventures IV GP LLC, Vance Spencer and Michael Ernest Anderson, each of which or whom are considered to be in a "group" with R01 Fund LP, R01 Capital LLC, R01 Capital Manager LLC and Kazley for purposes of Rule 13d-3 under the Exchange Act. The reported securities may also be deemed to be beneficially owned by R01 Capital LLC, R01 Capital Manager LLC and Michael Kazley, each of which or whom disclaims beneficial ownership of such shares, except to the extent of its or his pecuniary interest therein. 0002091724 N R01 Capital Manager LLC a WC N DE 0.00 33404510.00 0.00 33404510.00 33404510.00 N 46.9 OO This Amendment No. 6 is being filed to update the beneficial ownership of the Reporting Persons to reflect the exercise in full of the 11,332,020 shares of Common Stock issuable upon the exercise of the pre-funded warrants issued by the Issuer to R01 Fund LP and other investors on October 16, 2025 (the "Pre-Funded Warrants," and such shares issuable upon their exercise, the "Warrant Shares"). The Reporting Persons paid the exercise price on a cashless basis, resulting in the withholding of 24,720 of the Warrant Shares to pay the exercise price and issuing to the Reporting Persons the remaining 11,307,300 Warrant Shares. The percentage calculation set forth above is based on 27,835,180 shares of Common Stock outstanding as of June 15, 2026 and also contemplates the cashless exercise of 11,332,020 shares of Common Stock underlying the Pre-Funded Warrants issued by the Issuer to Framework Ventures IV L.P., Framework Ventures Management LLC, Framework Ventures IV GP LLC, Vance Spencer and Michael Ernest Anderson, each of which or whom are considered to be in a "group" with R01 Fund LP, R01 Capital LLC, R01 Capital Manager LLC and Kazley for purposes of Rule 13d-3 under the Exchange Act. The reported securities may also be deemed to be beneficially owned by R01 Capital LLC, R01 Capital Manager LLC and Michael Kazley, each of which or whom disclaims beneficial ownership of such shares, except to the extent of its or his pecuniary interest therein. 0002091727 N Kazley Michael John a WC N DE 0.00 33404510.00 4118828.00 33404510.00 37523338.00 N 49.8 IN This Amendment No. 6 is being filed to update the beneficial ownership of the Reporting Persons to reflect the exercise in full of the 11,332,020 shares of Common Stock issuable upon the exercise of the pre-funded warrants issued by the Issuer to R01 Fund LP and other investors on October 16, 2025 (the "Pre-Funded Warrants," and such shares issuable upon their exercise, the "Warrant Shares"). The Reporting Persons paid the exercise price on a cashless basis, resulting in the withholding of 24,720 of the Warrant Shares to pay the exercise price and issuing to the Reporting Persons the remaining 11,307,300 Warrant Shares. The percentage calculation set forth above is based on 27,835,180 shares of Common Stock outstanding as of June 15, 2026 and also contemplates the cashless exercise of 11,332,020 shares of Common Stock underlying the Pre-Funded Warrants issued by the Issuer to Framework Ventures IV L.P., Framework Ventures Management LLC, Framework Ventures IV GP LLC, Vance Spencer and Michael Ernest Anderson, each of which or whom are considered to be in a "group" with R01 Fund LP, R01 Capital LLC, R01 Capital Manager LLC and Kazley for purposes of Rule 13d-3 under the Exchange Act. The reported securities may also be deemed to be beneficially owned by R01 Capital LLC, R01 Capital Manager LLC and Michael Kazley, each of which or whom disclaims beneficial ownership of such shares, except to the extent of its or his pecuniary interest therein. Common Stock, $0.01 par value Stablecoin Development Corp 2000 POWELL STREET, SUITE 1150 EMERYVILLE CA 94608 Explanatory Note: This Amendment No. 6 amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on October 15, 2025, as amended and supplemented by that certain Amendment No. 1 to Schedule 13D filed on October 25, 2025, as amended and supplemented by that certain Amendment No. 2 to Schedule 13D filed on January 20, 2026, as amended and supplemented by that certain Amendment No. 3 to Schedule 13D filed on April 2, 2026, as amended and supplemented by that certain Amendment No. 4 to Schedule 13D filed on April 30, 2026, and as amended and supplemented by that certain Amendment No. 5 to Schedule 13D filed on May 19, 2026 (as amended, the "Statement") by R01 Fund LP ("R01") with respect to the Common Stock of Stablecoin Development Corporation (the "Company"). This Amendment No. 6 is being filed to update the beneficial ownership of the Reporting Persons to reflect the exercise in full of the 11,332,020 shares of Common Stock issuable upon the exercise of the pre-funded warrants issued by the Issuer to R01 Fund LP and other investors on October 16, 2025 (the "Pre-Funded Warrants," and such shares issuable upon their exercise, the "Warrant Shares"). The Reporting Persons paid the exercise price on a cashless basis, resulting in the withholding of 24,720 of the Warrant Shares to pay the exercise price and issuing to the Reporting Persons the remaining 11,307,300 Warrant Shares. Unless otherwise defined herein, capitalized terms used in this Amendment No. 6 shall have the meanings ascribed to them in the Statement. Unless amended or otherwise stated below, the information for R01 in the Statement remains unchanged. R01 Fund LP, R01 Capital LLC and R01 Capital Manager LLC beneficially own an aggregate of 33,404,510.00 shares of Common Stock (the "R01 Shares"). The R01 Shares represent approximately 46.9% of the outstanding shares of Common Stock. This percentage calculation is based on 27,835,180 shares of Common Stock outstanding as of June 15, 2026 and also contemplates the cashless exercise of 11,332,020 shares of Common Stock underlying the Pre-Funded Warrants issued by the Issuer to Framework Ventures IV L.P., Framework Ventures Management LLC, Framework Ventures IV GP LLC, Vance Spencer and Michael Ernest Anderson, each of which or whom are considered to be in a "group" with the Reporting Persons for the purposes of Rule 13d-3 under the Exchange Act. Michael Kazley beneficially owns an aggregate of 37,523,338.00.00 shares of Common Stock (the "Kazley Shares", and together with the R01 Shares, the "Subject Shares"). The Kazley Shares represent approximately 49.8% of the outstanding shares of Common Stock. This percentage calculation is based on 27,835,180 shares of Common Stock outstanding as of June 15, 2026 and also contemplates the cashless exercise of 11,332,020 shares of Common Stock underlying the Pre-Funded Warrants issued by the Issuer to Framework Ventures IV L.P., Framework Ventures Management LLC, Framework Ventures IV GP LLC, Vance Spencer and Michael Ernest Anderson, each of which are considered to be in a "group" with the Reporting Persons for the purposes of Rule 13d-3 under the Exchange Act. 1. Sole power to vote or direct vote: R01 Fund LP, R01 Capital LLC and R01 Capital Manager LLC: 0 shares of Common Stock Michael Kazley: 0 shares of Common Stock 2. Shared power to vote or direct vote: R01 Fund LP, R01 Capital LLC and R01 Capital Manager LLC: 33,404,510.00 shares of Common Stock Michael Kazley: 33,404,510.00 shares of Common Stock 3. Sole power to dispose or direct the disposition: R01 Fund LP, R01 Capital LLC and R01 Capital Manager LLC: 0 shares of Common Stock Michael Kazley: 4,118,828 shares of Common Stock 4. Shared power to dispose or direct the disposition: R01 Fund LP, R01 Capital LLC and R01 Capital Manager LLC: 33,404,510.00 shares of Common Stock Michael Kazley: 33,404,510.00 shares of Common Stock Except as described in this Schedule 13D, none of the Reporting Persons have effected any transaction in the shares of Common Stock during the past 60 days. No person other than the Reporting Persons is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Subject Shares. Not applicable. R01 Fund LP /s/ Michael Kazley 06/17/2026 R01 Capital LLC /s/ Michael Kazley 06/17/2026 R01 Capital Manager LLC /s/ Michael Kazley 06/17/2026 Kazley Michael John /s/ Michael Kazley 06/17/2026