D. Boral Sponsor I LLC Files Schedule 13G Reporting 28.94% Ownership in D. Boral Acquisition I Corp.

D. Boral Sponsor I LLC, along with managers David Boral and John Darwin, filed a Schedule 13G on March 31, 2026, reporting beneficial ownership of 12,521,429 shares (28.94%) of D. Boral Acquisition I Corp.'s Class A common stock. The filing represents a joint filing agreement among the three reporting persons. The ownership includes both Class B ordinary shares convertible into Class A shares and direct holdings of Class A common stock. David Boral and John Darwin, as managers of D. Boral Sponsor I LLC, hold voting and investment discretion over the shares held by the LLC, giving them shared beneficial ownership. The filing excludes 100,000 Class A ordinary shares issuable upon exercise of warrants underlying private units that are not presently exercisable. The percentage ownership is calculated based on 43,271,429 total shares outstanding, including shares from the company's initial public offering and other holdings.