Form 15-12G HAWAIIAN ELECTRIC CO

October 17, 2025 4:25 PM UTC

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 15

CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER
SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION
OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934.

Commission File Number: 001-4955

Hawaiian Electric Company, Inc.
(Exact name of registrant as specified in its charter)

1099 Alakea Street, Suite 2200
Honolulu, Hawaii 96813
(808) 543-7771
(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Cumulative Preferred Stock
(Title of each class of securities covered by this Form)

Common Stock, par value $6-2/3 per share
(Titles of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains)

Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:
Rule 12g-4(a)(1)
x
Rule 12g-4(a)(2)
¨
Rule 12h-3(b)(1)(i)
x
Rule 12h-3(b)(1)(ii)
¨
Rule 15d-6
¨
Rule 15d-22(b)
¨
Approximate number of holders of record as of the certification or notice date: 136
Pursuant to the requirements of the Securities Exchange Act of 1934, Hawaiian Electric Company, Inc. has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person.

Date: October 17, 2025By:/s/ Paul K. Ito
Name: Paul K. Ito
Title: Senior Vice President,
Chief Financial Officer and Treasurer





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