Harmony Gold reports two deaths at Mponeng mine

Harmony Gold Mining Company Limited reported a tragic shaft engineering-related incident at its Mponeng mine near Carletonville, in which two employees lost their lives.

Rhea-AI Filing Summary

Harmony Gold Mining Company Limited reported a tragic shaft engineering-related incident at its Mponeng mine near Carletonville, in which two employees lost their lives. Management is supporting the affected families and employees, and all relevant stakeholders have been notified.

An investigation led by the Department of Mineral and Petroleum Resources is underway to understand the circumstances of the incident. Chief Executive Officer Beyers Nel emphasized that the safety and well-being of employees remain the company’s highest priority and expressed heartfelt condolences to the families, friends and colleagues of the deceased.

Key Figures

Employees deceased: 2 employees Incident date reference: 25 May 2026

2 metrics

Employees deceased 2 employees Loss-of-life incident at Mponeng mine

Incident date reference 25 May 2026 Johannesburg, Monday, 25 May 2026 statement

Key Terms

shaft engineering-related incident, loss-of-life incident, Department of Mineral and Petroleum Resources, foreign private issuer

4 terms

shaft engineering-related incident technical

"a tragic shaft engineering‑related incident at its Mponeng mine"

loss-of-life incident other

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

Department of Mineral and Petroleum Resources regulatory

"An investigation, led by the Department of Mineral and Petroleum Resources (DMPR), is underway"

foreign private issuer regulatory

"REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a‑16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

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

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Accepted by SEC EDGAR 05/26/2026 - 07:49 AM Learn about SEC filing dates

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 May 25, 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 tragic loss-of-life incident at Mponeng mine

Johannesburg, Monday, 25 May 2026. Harmony Gold Mining Company Limited (“Harmony” or the “Company”) regrets to report a tragic shaft engineering‑related incident at its Mponeng mine near Carletonville yesterday morning, resulting in the loss of two employees’ lives.

We extend our deepest condolences to the families of the deceased. Management is providing the necessary support to the families and affected employees during this difficult time.

All relevant stakeholders have been notified. An investigation, led by the Department of Mineral and Petroleum Resources (DMPR), is underway.

"We are deeply saddened by this tragic loss of life. Our thoughts and heartfelt condolences are with the families, friends and colleagues of our employees during this very difficult time. The safety and well-being of our people remain our highest priority, and we are committed to fully understanding the circumstances of this incident, learning from it, and doing everything possible to prevent a recurrence," said Beyers Nel, Chief Executive Officer of Harmony.

Ends.

For more details contact:

Chipo Morapedi-Mrara

Head of Communications

+27 (0)60 571 0797

Jared Coetzer

Head of Investor Relations

+27 (0)82 746 4120

Mashego Mashego

Executive Director

+27 (0)82 767 1072

25 May 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: May 25, 2026									By: /s/ Boipelo Lekubo
									Name: Boipelo Lekubo
									Title: Financial Director