X0202 SCHEDULE 13G 0001578621 XXXXXXXX LIVE Class A Ordinary Shares, par value $0.0001 per share 03/31/2026 0002090452 FG Imperii Acquisition Corp G3R41C128 104 S. Walnut Street, Unit 1A Itasca IL 60143 Rule 13d-1(b) LMR Partners LLP X0 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 IA PN LMR PARTNERS Ltd K3 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 CO IA LMR Partners LLC DE 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 IA OO LMR Partners AG V8 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 CO IA LMR PARTNERS (DIFC) Ltd C0 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 CO IA LMR Partners (Ireland) Limited L2 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 CO IA Ben Levine X0 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 HC IN Stefan Renold V8 0.00 1523071.00 0.00 1523071.00 1523071.00 6.6 HC IN FG Imperii Acquisition Corp 104 S. Walnut Street, Unit 1A, Itasca, Illinois, 60143 This statement is filed by: (i) LMR Partners LLP, LMR Partners Limited, LMR Partners LLC, LMR Partners AG, LMR Partners (DIFC) Limited and LMR Partners (Ireland) Limited (collectively, the "LMR Investment Managers"), which serve as the investment managers to certain funds with respect to the shares of Class A Ordinary Shares, par value $0.0001 per share ("Class A Ordinary Shares"), held by certain funds; and (ii) Ben Levine and Stefan Renold, who are ultimately in control of the investment and voting decisions of the LMR Investment Managers with respect to the securities held by certain funds. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." The address of the principal business office of each of the Reporting Persons is c/o LMR Partners LLP, 9th Floor, Devonshire House, 1 Mayfair Place, London, W1J 8AJ, United Kingdom. LMR Partners LLP is a United Kingdom limited liability partnership. LMR Partners Limited is a Hong Kong corporation. LMR Partners LLC is a Delaware limited liability company. LMR Partners AG is a Swiss corporation. LMR Partners (DIFC) Limited is a United Arab Emirates corporation. LMR Partners (Ireland) Limited is a limited company incorporated in Ireland. Ben Levine is a citizen of the United Kingdom. Stefan Renold is a citizen of Switzerland. N FI HC IA Investment Adviser The Class A Ordinary Shares beneficially owned by the Reporting Persons are directly held by LMR Multi-Strategy Master Fund Limited ("LMR Master Fund") and LMR CCSA Master Fund Ltd ("LMR CCSA Master Fund"). The information required by Items 4(a) - (c) is set forth in Rows 5 - 11 of the cover page for each of the Reporting Persons and is incorporated herein by reference. As of March 31, 2026: LMR Master Fund acquired 761,535 units and LMR CCSA Master Fund acquired 761,536 units of the Issuer's securities ("Units") in the Issuer's initial public offering, with each Unit consisting of one Class A Ordinary Share and one-half (1/2) of one redeemable warrant (each whole redeemable warrant exercisable for one Class A Ordinary Share). By virtue of holding the Units, LMR Master Fund directly holds 761,535 Class A Ordinary Shares and LMR CCSA Master Fund directly holds 761,536 Class A Ordinary Shares, with a total of 1,523,071 Class A Ordinary Shares in the aggregate (the "LMR Shares"). In addition to the LMR Shares, by virtue of holding the Units, LMR Master Fund also directly holds redeemable warrants to purchase 380,767 Class A Ordinary Shares and LMR CCSA Master Fund also directly holds redeemable warrants to purchase 380,768 Class A Ordinary Shares, with a total of redeemable warrants to purchase 761,535 Class A Ordinary Shares in the aggregate ("Warrants"). The Warrants have an exercise price of $11.50 per Class A Ordinary Share and are exercisable on the later of 30 days after the completion of the Issuer's initial business combination and 12 months from the closing of the Issuer's initial public offering, and will expire five years after the completion of the Issuer's initial business combination or earlier upon redemption or the Issuer's liquidation. As of March 31, 2026: The Class A Ordinary Shares held by each of LMR Master Fund and LMR CCSA Master Fund represent approximately 3.3% and the LMR Shares in the aggregate represent approximately 6.6% of the outstanding Class A Ordinary Shares, based on 23,025,000 Class A Ordinary Shares of the Issuer outstanding as of March 31, 2026, as reported in the Issuer's Form 10-K filed with the Securities and Exchange Commission on March 31, 2026. As of March 31, 2026, each of the Reporting Persons had sole power to vote or direct the vote of 0 Class A Ordinary Shares. As of March 31, 2026, each of the Reporting Persons had shared power to vote or direct the vote of 1,523,071 Class A Ordinary Shares. As of March 31, 2026, each of the Reporting Persons had sole power to dispose or to direct the disposition of 0 Class A Ordinary Shares. As of March 31, 2026, each of the Reporting Persons had shared power to dispose or to direct the disposition of 1,523,071 Class A Ordinary Shares. Y N N The securities beneficially owned by the Reporting Persons are directly held by LMR Master Fund and LMR CCSA Master Fund, for which the LMR Investment Managers serve as the investment managers. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the foreign regulatory scheme applicable to LMR Partners LLP, LMR Partners Limited, LMR Partners AG, LMR Partners (DIFC) Limited and LMR Partners (Ireland) Limited is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D. LMR Partners LLP Shane Cullinane 05/15/2026 LMR PARTNERS Ltd Shane Cullinane 05/15/2026 LMR Partners LLC Allyson Hanlon 05/15/2026 LMR Partners AG Shane Cullinane 05/15/2026 LMR PARTNERS (DIFC) Ltd Shane Cullinane 05/15/2026 LMR Partners (Ireland) Limited Shane Cullinane 05/15/2026 Ben Levine Ben Levine 05/15/2026 Stefan Renold Stefan Renold 05/15/2026