* The actual leverage factor will be determined on the pricing date

Initial index level:	For each underlying index, its closing level on the pricing date
Final index level:	For each underlying index, its closing level on the valuation date
Index performance factor:	For each underlying index, its final index level divided by its initial index level
Index percent increase:	For each underlying index, (i) its final index level minus its initial index level divided by (ii) its initial index level
Worse performing underlying index:	The underlying index with the lowest index performance factor on the valuation date

⁽¹⁾ Assumes that the leverage factor is equal to the lowest value indicated under Preliminary Terms.

⁽²⁾ Hypothetical return of worst performing underlying index = hypothetical percentage change from initial index level to final index level of worst performing underlying index

⁽³⁾ Hypothetical total return on securities at maturity = hypothetical payment at maturity per security minus $1,000 stated principal amount per security, divided by $1,000 stated principal amount per security

This offering summary does not contain all of the material information an investor should consider before investing in the securities. This offering summary is not for distribution in isolation and must be read together with the accompanying preliminary pricing supplement and the other documents referred to therein, which can be accessed via the following hyperlink: Preliminary Pricing Supplement dated April 30, 2018

Hypothetical Payment at Maturity Diagram*
n The Securities	n The Worst Performing Underlying Index

* Assumes that the leverage factor is equal to the lowest value indicated under Preliminary Terms.

The above summary of selected risks does not describe all of the risks associated with an investment in the securities. You should read the accompanying preliminary pricing supplement and product supplement for a more complete description of risks relating to the securities.

Citigroup Global Markets Holdings Inc. and Citigroup Inc. have filed registration statements (including the accompanying preliminary pricing supplement, product supplement, underlying supplement, prospectus supplement and prospectus) with the Securities and Exchange Commission (“SEC”) for the offering to which this communication relates. Before you invest, you should read the accompanying preliminary pricing supplement, product supplement, underlying supplement, prospectus supplement and prospectus in those registration statements (File Nos. 333-216372 and 333-216372-01) and the other documents Citigroup Global Markets Holdings Inc. and Citigroup Inc. have filed with the SaEC for more complete information about Citigroup Global Markets Holdings Inc., Citigroup Inc. and this offering. You may obtain these documents without cost by visiting EDGAR on the SEC website at www.sec.gov. Alternatively, you can request these documents by calling toll-free 1-800-831-9146.

Filed pursuant to Rule 433