Harmony Gold reports fatal incident at Mponeng

HARMONY GOLD MINING CO LTD (HMY) reports a loss-of-life incident at its Mponeng mine in the West Rand of Gauteng on September 14, 2026, following a seismic event in an underground working area.

Rhea-AI Filing Summary

HARMONY GOLD MINING CO LTD (HMY) reports a loss-of-life incident at its Mponeng mine in the West Rand of Gauteng on September 14, 2026, following a seismic event in an underground working area. Work in the affected area has been suspended while an investigation is conducted, and the Department of Mineral and Petroleum Resources and other stakeholders have been notified. The company states it remains committed to improving safety across its operations through strengthened controls, training, and learning from incidents.

Key Figures

Incident date: September 14, 2026 Report date: September 15, 2026 Investor relations contact number: +27 (0)82 746 4120

3 metrics

Incident date September 14, 2026 Date of the loss-of-life incident at the Mponeng mine

Report date September 15, 2026 Date Harmony Gold reported the incident and signed the 6-K

Investor relations contact number +27 (0)82 746 4120 Phone number for Head of Investor Relations, Jared Coetzer

Key Terms

loss-of-life incident, seismic event, Department of Mineral and Petroleum Resources, critical controls

4 terms

loss-of-life incident other

"Harmony reports a loss-of-life incident at its Mponeng mine"

seismic event technical

"The incident occurred following a seismic event in an underground"

Department of Mineral and Petroleum Resources regulatory

"The Department of Mineral and Petroleum Resources and other"

critical controls other

"through strengthening critical controls, training and development"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What incident did HMY (Harmony Gold Mining) report at its Mponeng mine?

Harmony Gold Mining reported a loss-of-life incident at its Mponeng mine in the West Rand of Gauteng on September 14, 2026, following a seismic event in an underground working area.

How has Harmony Gold (HMY) responded operationally to the Mponeng incident?

Harmony Gold has suspended work in the affected area of the Mponeng mine while a thorough investigation is conducted to determine the circumstances and identify any additional safety measures.

Which authorities were notified about the Mponeng incident by Harmony Gold (HMY)?

Harmony Gold states that the Department of Mineral and Petroleum Resources and other relevant stakeholders have been notified about the loss-of-life incident at the Mponeng mine.

What safety commitment does Harmony Gold (HMY) emphasize in this 6-K?

Harmony Gold emphasizes its commitment to improving safety across its operations by strengthening critical controls, enhancing training and development, learning from incidents, and working with stakeholders to eliminate loss of life and create safer workplaces.

Who is the investor relations contact listed by Harmony Gold (HMY) for this incident?

The investor relations contact is Jared Coetzer, Head of Investor Relations, with a listed phone number of +27 (0)82 746 4120.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6­K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a­16 OR 15d­16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

For September 15, 2026

Harmony Gold Mining Company Limited

Randfontein Office Park

Corner Main Reef Road and Ward Avenue Randfontein, 1759

South Africa

(Address of principal executive offices)

*-­

(Indicate by check mark whether the registrant files or will file annual reports under cover of

Form 20­ F or Form 40­F.)

Form 20F ☒ Form 40F ☐

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3­2(b) under the Securities Exchange Act of 1934.)

Yes ☐ No ☒

Harmony Gold Mining Company Limited

Registration number 1950/038232/06

Incorporated in the Republic of South Africa

ISIN: ZAE000015228

JSE share code: HAR

(“Harmony”)

Harmony reports a loss-of-life incident at its Mponeng mine

Johannesburg. Tuesday, 15 September 2026. Harmony Gold Mining Company Limited (“Harmony” and/or “the Company”) deeply regrets to report a loss-of-life incident at its Mponeng mine in the West Rand of Gauteng on Monday, 14 September 2026.

The incident occurred following a seismic event in an underground working area. Work in the affected area has been suspended while a thorough investigation is conducted to determine the circumstances and identify any additional measures needed to strengthen safety controls and risk management practices.

Harmony extends its sincere condolences to the employee’s family, friends and colleagues. Support is being provided to those affected.

The Department of Mineral and Petroleum Resources and other relevant stakeholders have been notified.

Harmony remains committed to improving safety across its operations through strengthening critical controls, training and development, learning from incidents and working in partnership with all our stakeholders to eliminate loss of life and create safer workplaces for all.

For more details contact:

Jared Coetzer

Head of Investor Relations

+27 (0)82 746 4120

15 September 2026

Sponsor:

J.P. Morgan Equities South Africa Proprietary Limited.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on

its behalf by the undersigned, thereunto duly authorized.

									Harmony Gold Mining Company Limited
Date: September 15, 2026									By: /s/ Boipelo Lekubo
									Name: Boipelo Lekubo
									Title: Financial Director