X0202 SCHEDULE 13D/A 0001140361-25-025252 0002044902 XXXXXXXX LIVE 2 Common Shares, $0.001 par value per share 06/30/2026 0001995574 Y4001C305 Icon Energy Corp

c/o Pavimar Shipping Co., 17th km National Road Athens-Lamia & Foinikos St Athens J3 14564

Atlantis Holding Corp. 30 211 88 81 300 c/o Pavimar Shipping Co. 17th km National Road Athens J3 14564 0002044902 N Atlantis Holding Corp. /RMI/ OO 1T 0 23954522 0 23954522 23954522 86.4 CO Note to Rows 8, 10 and 11: This amount includes (i) 1,000 Common Shares, $0.001 par value per share ("Common Shares") of Icon Energy Corp. (the "Issuer") and (ii) 23,953,522 Common Shares that may be deemed to be beneficially owned by the Reporting Person as of June 30, 2026, issuable upon the hypothetical conversion of 21,390 Series A Cumulative Convertible Perpetual Preferred Shares ("Series A Preferred Shares") of the Issuer owned by the Reporting Person. All Series A Preferred Shares (but not a portion) are convertible to Common Shares commencing July 16, 2025 and until July 15, 2032. See Item 3 for a description of the terms of the Series A Preferred Shares. Note to Row 13: Calculated pursuant to Rule 13d-3(d)(1)(i) based on (i) the 3,759,314 Common Shares outstanding as of June 30, 2026, as provided by the Issuer to the Reporting Person, and (ii) and the 23,953,522 Common Shares issuable upon the hypothetical conversion of the 21,390 Series A Preferred Shares owned by the Reporting Person as of June 30, 2026. Y Ismini Panagiotidi OO J3 0 23954522 0 23954522 23954522 86.4 IN Note to Rows 8, 10 and 11: This amount includes (i) 1,000 Common Shares, $0.001 par value per share ("Common Shares") of Icon Energy Corp. (the "Issuer") and (ii) 23,953,522 Common Shares that may be deemed to be beneficially owned by the Reporting Person as of June 30, 2026, issuable upon the hypothetical conversion of 21,390 Series A Cumulative Convertible Perpetual Preferred Shares ("Series A Preferred Shares") of the Issuer owned by the Reporting Person. All Series A Preferred Shares (but not a portion) are convertible to Common Shares commencing July 16, 2025 and until July 15, 2032. See Item 3 for a description of the terms of the Series A Preferred Shares. Note to Row 13: Calculated pursuant to Rule 13d-3(d)(1)(i) based on (i) the 3,759,314 Common Shares outstanding as of June 30, 2026, as provided by the Issuer to the Reporting Person, and (ii) and the 23,953,522 Common Shares issuable upon the hypothetical conversion of the 21,390 Series A Preferred Shares owned by the Reporting Person as of June 30, 2026. Common Shares, $0.001 par value per share Icon Energy Corp c/o Pavimar Shipping Co., 17th km National Road Athens-Lamia & Foinikos St Athens J3 14564 This Amendment No. 2 to Schedule 13D (this "Amendment") amends and supplements the statement on Schedule 13D filed on July 8, 2025 as amended by Amendment No.1 filed on January 20, 2026 (and as may be further amended and supplemented from time to time, the "Schedule 13D"), relating to the common shares, par value $0.001 per share ("Common Shares") of Icon Energy Corp. (the "Issuer") beneficially owned by each of the Reporting Persons. Except as set forth below, all Items of the Schedule 13D remain unchanged. Capitalized terms used in this Amendment and not otherwise defined shall have the respective meanings assigned to such terms in the Schedule 13D. The information set forth in response to each separate Item below shall be deemed to be a response to all Items where such information is relevant. Item 3 of Schedule 13D is hereby amended and supplemented by adding the following at the end thereof: "On June 30, 2026, Atlantis acquired 2,436 Series A Preferred Shares, as a result of the Issuer's election to pay in kind the dividend due on the Series A Preferred Shares." The responses to Rows (7) through (13) of the cover page of this Amendment and the accompanying notes to such Rows are incorporated herein by reference. Atlantis is controlled by Ismini Panagiotidi. Mrs. Panagiotidi may be considered to be a beneficial owner of the Common Shares held by Atlantis by virtue of her control of the equity and voting power of Atlantis. The responses to Rows (7) through (13) of the cover page of this Amendment and the accompanying notes to such Rows are incorporated herein by reference. The Reporting Persons share beneficial ownership over all of the Common Shares reported in this Amendment. Other than as described in this Amendment, the Reporting Persons did not effect any transactions in the Common Shares during the past sixty days. Not applicable. Not applicable. Atlantis Holding Corp. /RMI/ /s/ Ismini Panagiotidi 07/02/2026 Ismini Panagiotidi /s/ Ismini Panagiotidi 07/02/2026