The principal business address of BBUC is 225 Liberty Street, 8th Floor, New York, NY 10281.

BBUC is a corporation organized under the laws of British Columbia, Canada. The principal business of BBUC is to serve as BN's primary public vehicle to own and operate business services and industrial operations on a global basis.

During the last five years, none of the Reporting Persons and, to their respective knowledge, none of the Scheduled Persons, has been: (i) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors); or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which, he, she or it was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

The information set forth in Item 2(d) of this Schedule 13D is hereby incorporated herein by reference.

Schedule I sets forth the names of directors and executive officers (to be included as Scheduled Persons) of BBUC and their respective principal occupations, addresses and citizenships.

Item 4 of the original Schedule 13D is hereby supplemented as follows: On March 27, 2026, BBUC (formerly 1559985 B.C. Ltd.) completed the previously announced plan of arrangement (the "Arrangement") pursuant to which, among other things, (i) all Units, BBHC exchangeable shares and REUs were exchanged for newly issued class A subordinate voting shares of BBUC ("BBUC Class A Shares") on a one-for-one basis, (ii) the special limited partnership units of Holding LP, which were held by a subsidiary of Brookfield Asset Management Ltd., were exchanged for special non-voting incentive shares of BBUC ("Special Shares") on a one-for-one basis, (iii) BN exchanged its share of Brookfield Business Partners Limited, the general partner of BBU, for class B multiple voting shares of BBUC ("Class B Shares"), (iv) BBHC (formerly Brookfield Business Corporation) was renamed "Brookfield Business Holdings Corporation", (v) BBUC was renamed "Brookfield Business Corporation", and (vi) the BBUC Class A Shares will be listed on the New York Stock Exchange and the Toronto Stock Exchange under the symbol "BBUC" (the ticker symbol previously used for the BBHC exchangeable shares). Following completion of the Arrangement, BN, Brookfield Wealth Solutions Ltd. (a paired entity to BN) ("BNT"), and their respective subsidiaries own 142,749,301 BBUC Class A Shares, representing 69.0% of the issued and outstanding BBUC Class A Shares, 4 Class B Shares, representing 100% of the issued and outstanding Class B Shares, and 4 Special Shares, representing 100% of the issued and outstanding Special Shares. A Schedule 13D with respect to BBUC Class A Shares has been filed concurrently with this Amendment No. 12. Upon completion of the Arrangement, the Issuer became a subsidiary of BBUC. In connection with the closing of the Arrangement, the Units will be delisted from the New York Stock Exchange, and the Issuer intends to file with the U.S. Securities and Exchange Commission a certification and notice on Form 15 with respect to the Units after the delisting and deregistration under Section 12(b) of the Act becomes effective. Once the Form 15 becomes effective, the Reporting Persons' reporting obligations with respect to the Units under Section 13(d) of the Act will cease.

Item 5(a) - (c) of the original Schedule 13D is hereby amended and restated as follows: (a)-(b) The information relating to the beneficial ownership of the Units by each of the Reporting Persons set forth in Rows 7 through 13 of the cover pages hereto (including the footnotes thereto) is incorporated by reference herein. Except as otherwise noted in the footnotes to the cover pages hereto, the percentage of Units of the Issuer is based on an aggregate number of Units outstanding immediately prior to the Arrangement and assumes that all of the outstanding REUs and BBHC exchangeable shares are exchanged for Units (on a one-for-one basis).

Item 5(c) of Schedule 13D is hereby supplemented as follows: From March 23 until March 26, 2026, BN purchased in open market transactions through the facilities of the New York Stock Exchange and Toronto Stock Exchange an aggregate of 98,088 Units at average prices ranging from $30.7678 (C$42.3825 converted to U.S. dollars at the Bank of Canada daily exchange rate of $1.00 = C$1.3761 on March 24, 2026) to $33.1115 (C$45.8710 converted to U.S. dollars at the Bank of Canada daily exchange rate of $1.00 = C$1.3844 on March 26, 2026) per Unit in accordance terms of the Issuer's previously announced normal course issuer bid.

Item 5(e) of Schedule 13D is hereby supplemented as follows: On March 27, 2026, BNT BBU Holding LP and BPEG BN Holdings LP ceased to be beneficial owners of more than five percent of the Units.

Item 6 of the original Schedule 13D is hereby supplemented as follows: The information set forth in Item 4 of this Amendment No. 12 is hereby incorporated by reference. Upon completion of the Arrangement, the registration rights agreement dated June 1, 2016 between BBU and BN and the amended and restated rights agreement dated December 23, 2024 between BN and Wilmington Trust, National Association was automatically terminated. Upon completion of the Arrangement, the voting agreement dated September 26, 2024 between BN and BNT in respect of the Units was amended to provide that all decisions to be made with respect to the voting of the BBUC Class A Shares held by subsidiaries of BNT will be made jointly by mutual agreement of the applicable BNT subsidiary and BN, other than with respect to any BBUC Class A Shares subject to financing arrangements between the applicable BNT subsidiary and wholly-owned subsidiaries of BN.

Item 7 of the original Schedule 13D is hereby supplemented as follows: Exhibit 99.1 Joint Filing Agreement. Exhibit 99.2 Schedule I.