X0609 4 2026-04-27 1 0002088896 X-Energy, Inc. XE 0001620263 Ares Partners Holdco LLC false C/O ARES MANAGEMENT LLC, 1800 AVENUE OF THE STARS, SUITE 1400 LOS ANGELES CA 90067 0 0 0 1 Former 10% Owner 0002127049 Ares X-Energy Holdings LP false C/O ARES MANAGEMENT LLC, 245 PARK AVENUE, 44TH FLOOR NEW YORK NY 10167 0 0 0 1 Former 10% Owner 0002127790 ACIP Investments Pooling LLC - Series 31 false C/O ARES MANAGEMENT LLC, 1800 AVENUE OF THE STARS, SUITE 1400 LOS ANGELES CA 90067 0 0 0 1 Former 10% Owner 0 Upon the closing of the initial public offering of X-Energy, Inc. (the "Issuer") on April 27, 2026, the reporting persons' ownership of the Issuer's Class A common stock was diluted below 10% and the reporting persons are therefore no longer subject to Section 16 of the Securities Exchange Act of 1934, as amended. This exit report is made on a voluntary basis as the reporting persons have not acquired or disposed of any additional securities of the Issuer. Ares Partners Holdco LLC By: /s/ Anton Feingold; Authorized Signatory 2026-04-29 Ares X-Energy Holdings LP By: /s/ Anton Feingold; Authorized Signatory 2026-04-29 ACIP Investments Pooling LLC - Series 31 By: /s/ Noah Ehrenpreis; Authorized Signatory 2026-04-29