POWER OF ATTORNEY

The undersigned officer or director of ExxonMobil Holdings Corporation,
a Texas corporation ("ExxonMobil"), constitutes and
appoints each of J. Powell Fancher, Roy V. Richter, and Angela M.
Garriss, or Marsha E. Stewart Schreiner or any of them acting singly,
as his or her true and lawful attorneys-in-fact and agents, with
full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, to
prepare and sign, including by electronic signature, any and all
forms of report (including any amendments thereto) with respect to
securities of ExxonMobil required under Section 13 or Section 16 of
the Securities Exchange Act of 1934, as amended, or any rule or
regulation thereunder, or under Rule 144 of the Securities Act of 1933,
as amended, and to prepare, sign and submit any documents necessary or
appropriate to obtain codes and passwords enabling the undersigned to
make electronic filings with the Securities and Exchange Commission,
and to file such forms of report, and any other documents in connection
therewith, with the Securities and Exchange Commission, any stock
exchange and ExxonMobil, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform
each and every act and thing requisite and necessary to be done,
as fully for all intents and purposes as he or she might or could do
in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them or their or his or her
substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

This power of attorney shall be remain in effect until the
undersigned is no longer required to file any of the forms of report
described above with respect to securities of ExxonMobil Holdings
Corporation, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact. Effective as of the
date of this power of attorney, the undersigned hereby revokes any
and all earlier-dated powers of attorney given by the undersigned
with respect to ExxonMobil securities reporting under said Section 13,
Section 16 or Rule 144.

IN WITNESS WHEREOF, the undersigned has executed this power of
attorney as of the date set forth below.


  July 1, 2026          	Susan Buchanan
     Date	                   Signature

  Houston, Texas
 Location (City, State)
