Disclaimer: This document is an English translation of the Japanese original which is filed with the Tokyo Stock Exchange and is onlyfor reference purposes. In case of any discrepancy between this translation and the Japanese original, the latter shall prevail.

May 14, 2024

To Whom It May Concern
Company name:

HAZAMA ANDO CORPORATION

Representative:

Representative Director and President

Kazuhiko Kuniya

Tokyo Stock Exchange Prime Market Securities Code: 1719
Contact:

General Manager,Eisuke Yamada

Corporate Communication Department
Phone: +81-3-3575-6094(Update on disclosed matter) Additional Costs Arising for Construction Work Underway
HAZAMA ANDO CORPORATION (the “Company”) hereby announces that it expects additional costs to arise inregard to the incident (the “incident”) disclosed in its November 9, 2023 release “Occurrence of an Incident in
Construction Work Underway” and occurring during foundation work for the steel guard wall (south side foundationand north side foundation) for construction works being undertaken by a joint venture with the Company as therepresentative and outlined at the end of this release.
The Company deeply apologizes to the contractee and all other concerned parties for any concern andinconvenience caused by the incident. The Company will continue to take appropriate measures responsibly as aconstructor.

1. Additional costs
In cooperation with concerned parties to the construction work, including the contractee, the Company instituted
an investigation of the south side foundation and north side foundation to determine the cause of the incident
and after examining repair/reinforcement plans based on the results of this investigation, it is presently preparing
for repair/reinforcement work.
As of the end of the fiscal year ended March 31, 2024, the Company expected additional costs of approximately
6.2 billion yen arising from repair and other expenses as determined by our reasonable estimate of the impact on
profits/losses arising from this incident and in light of examinations to date.
Please note that these additional costs will be recognized over a certain period of time based on progress withthe performance of obligations under this construction work contract.

2. Impact on the Company’s consolidated financial results
The Company’s consolidated financial results for the fiscal year ended March 31, 2024, which factor in theseadditional costs, are as reported in “Consolidated Financial Results for the Fiscal Year Ended March 31, 2024
[Japanese GAAP]” disclosed today.
After determining repair/reinforcement plans and other matters, should it become clear that there will be asignificant impact on the Company’s consolidated financial results forecast for the fiscal year ending March 31,2025, the Company will disclose it in a timely and appropriate manner.

1[Outline of construction work]
Name of construction work: Installation of a seawall (seawater pump room area section) and otherconstruction works at Tokai No.2 Power Plant
Contractee:

The Japan Atomic Power Company

Constructor:

Joint venture between HAZAMA ANDO CORPORATION,PENTA-OCEAN CONSTRUCTION CO., LTD., andWAKACHIKU CONSTRUCTION CO., LTD.

Construction site:

Tokai-mura, Naka-gun, Ibaraki Prefecture2