JSE Reprimands Mantengu Mining Over Unsubstantiated Claims

What Happened?

In May 2025 the Johannesburg Stock Exchange (JSE) told Mantengu Mining that two of its announcements on the Stock Exchange News Service (SENS) were not allowed. The posts, titled “Stock Price Manipulation – Criminal Charges” and “Shorting Risk Warning,” claimed that someone was deliberately pushing the company’s share price down. The JSE said the statements were too vague and lacked proof, so they broke the exchange’s rules for sharing information.

Why the JSE Said the Announcements Were Problematic

For information to be considered “price‑sensitive” – meaning it could affect a share price – the JSE requires it to be:

• Specific and precise
• About a current or likely event
• Detailed enough for investors to judge its impact

The JSE found Mantengu’s posts were mostly guesses, suspicions, and unsupported accusations. Because there were no facts or evidence backing them up, the information did not meet the standards needed to help investors make decisions.

The Investigation Timeline

Early Concerns (2024)

Mantengu first raised worries about its share price in 2024, saying it was being manipulated through tactics like naked short selling.

Formal Complaints (May 2025)

The company filed criminal complaints with the Hawks (South Africa’s priority crime unit) against several JSE executives and other parties. Mantengu said these complaints followed months of internal reviews with consultants.

FSCA Review

The Financial Sector Conduct Authority (FSCA) looked at a sample of trades from June 2023 to February 2024. They found no evidence of illegal short selling or misconduct by the JSE or its staff, and saw no reason to take further action.

Mantengu’s Side of the Story

Mantengu argued that the FSCA review only covered part of the period they were concerned about and focused only on naked short selling, not the broader claims they made. The company also pointed to a trading update where it said earnings would exceed its market capitalization, suggesting the share price was undervalued.

When the JSE asked Mantengu to remove the announcements, the company refused, saying it had documentary evidence to back up its statements. Mantengu’s appointed adviser first approved the posts, then withdrew that approval and asked for them to be taken down – but Mantengu kept the announcements live on SENS.

The JSE’s Decision and Penalty

The JSE concluded that the issue was not whether the allegations were true, but whether the way Mantengu shared the information followed the exchange’s rules. Because the announcements did not meet the disclosure standards, the JSE:

• Ordered Mantengu to withdraw the posts (which the company did not do)
• Issued a reprimand
• Imposed a suspended fine of R100,000

What Does a Suspended Fine Mean?

The R100,000 fine will only have to be paid if Mantengu commits a similar violation within the next three years. If the company stays compliant, the fine will not be collected.

Lessons for Companies and Investors

• Check before you post: Companies must make sure any market‑moving information is factual, specific, and supported by evidence before sharing it publicly.
• Know the rules: Listing requirements exist to keep the market fair and to protect investors from misleading claims.
• Stay skeptical: Investors should look for verified facts and avoid acting on unverified rumors or allegations.

Conclusion

The JSE’s action against Mantengu Mining shows that even serious‑sounding claims must meet strict standards before they can be shared with the market. By insisting on clear, evidence‑based disclosures, the exchange aims to keep trading fair and maintain trust among all participants. For Mantengu, the episode serves as a reminder that following disclosure rules is just as important as the substance of any message they want to send.