SCHEDULE 13D/A 0000912282-24-000712 0002036773 XXXXXXXX LIVE 1 Common Stock 05/23/2025 false 0001567900 09229E303 Blackboxstocks Inc.

5430 LBJ Freeway, Suite 1485 Dallas TX 75240

Catherine DeFrancesco 954-914-8869 2300 E Las Olas Blvd, Floor 4 Ft. Lauderdale FL 33301 Copy to: Richard Raymer 416-367-7388 Dorsey & Whitney LLP 66 Wellington St. W, Suite 3400 Toronto A6 M5K 1E6 0002036773 Quadrifoglio Holdings LLC WC FL 172817 0 172817 0 172817 N 4.8 OO 0001684226 DeFrancesco Catherine Johanna WC X1 172817 0 172817 0 172817 N 4.8 IN 0002036766 Chiu Derrick WC X1 172817 0 172817 0 172817 N 4.8 IN Common Stock Blackboxstocks Inc. 5430 LBJ Freeway, Suite 1485 Dallas TX 75240 This Amendment No. 1 amends and supplements the Schedule 13D that was originally filed by the Reporting Persons with the Securities and Exchange Commission on October 23, 2024 (the "Original Schedule 13D"). Unless otherwise stated herein, the Original Schedule 13D remains in full force and effect. Capitalized terms used but not defined herein shall have the meanings assigned to them in the Original Schedule 13D. N/A N/A N/A N/A N/A N/A N/A The Reporting Persons sold an aggregate of 114,613 Shares between May 13, 2025, and June 6, 2025. Item 5 of the Schedule 13D is hereby amended and supplemented with the following: The information set forth in Item 4 of this Amendment and the cover pages of this Amendment is hereby incorporated by reference into this Item 5. Items 7 through 11 and 13 of each of the cover pages of this Amendment are incorporated herein by reference. As of the date of this Amendment, the Reporting Persons beneficially own an aggregate of 172,817 Shares, which represents approximately 4.8% of the outstanding Shares (based on the number of Shares outstanding as reported in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 15, 2025). 172,817 The Reporting Persons disposed of 114,683 Shares of the Issuer in the open market as detailed below: Trade Date Buy/Sell No. of Shares Price in USD 5/13/2025 Sell 7,581 $3.50 5/14/2025 Sell 623 $3.50 5/15/2025 Sell 1,796 $3.50 5/16/2025 Sell 3,481 $3.60 5/22/2025 Sell 6,000 $3.60 5/22/2025 Sell 519 $3.61 5/22/2025 Sell 6,586 $3.70 5/23/2025 Sell 3,000 $3.70 5/23/2025 Sell 414 $3.71 5/23/2025 Sell 5,000 $3.801 5/23/2025 Sell 5,000 $3.092 5/27/2025 Sell 3,683 $4.07 5/29/2025 Sell 3,100 $4.07 6/04/2025 Sell 17,900 $4.07 6/05/2025 Sell 10,000 $4.38 6/06/2025 Sell 20,000 $5.03 6/06/2025 Sell 20,000 $4.82 N/A As of May 23, 2025, as described in this Item 5 and Item 4 above, each of the Reporting Persons has ceased to be the beneficial owner of more than 5% of the Issuer's Shares. The filing of this Amendment represents the final amendment to the Schedule 13D and constitutes an exit filing for each of the Reporting Persons and the Reporting Persons as a group. N/A Quadrifoglio Holdings LLC Catherine DeFrancesco 06/20/2025 DeFrancesco Catherine Johanna Catherine DeFrancesco 06/20/2025 Chiu Derrick Derrick Chiu 06/20/2025