LyondellBasell Prices Public Offering of Guaranteed Notes

HOUSTON, Feb. 26, 2024

The net proceeds of the Offering are expected to be used for general corporate purposes, which may include the repayment of the 5.75% Senior Notes due 2024 issued by LyondellBasell.

Citigroup Global Markets Inc. and Mizuho Securities USA LLC are acting as the joint book-running managers for the Offering.

The Offering is being made pursuant to an effective shelf registration statement that was previously filed with the Securities and Exchange Commission (the "SEC"). A preliminary prospectus supplement has been filed, and a prospectus supplement relating to the offering of the Notes will be filed, with the SEC, to which this communication relates. Prospective investors should read the preliminary prospectus supplement and the accompanying prospectus included in the registration statement and other documents LyondellBasell has filed with the SEC relating to the Offering, copies of which may be obtained for free by visiting EDGAR on the SEC website at www.sec.gov. Alternatively, copies of the preliminary prospectus supplement and the accompanying base prospectus may be obtained by calling Citigroup Global Markets Inc. at 1-800-831-9146 or Mizuho Securities USA LLC at 1-866-271-7403.

This press release does not constitute an offer to sell or the solicitation of an offer to buy the Notes, nor shall there be any offer, solicitation or sale of the Notes in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Any offering of securities will be made only by means of a prospectus supplement, which will be filed with the SEC.

About LyondellBasell

We are LyondellBasell (NYSE: LYB) – a leader in the global chemical industry creating solutions for everyday sustainable living. Through advanced technology and focused investments, we are enabling a circular and low carbon economy. Across all we do, we aim to unlock value for our customers, investors and society. As one of the world's largest producers of polymers and a leader in polyolefin technologies, we develop, manufacture and market high-quality and innovative products for applications ranging from sustainable transportation and food safety to clean water and quality healthcare.