Regis Resources Ltd's stock plummeted 5.11% during intraday trading on Monday, marking a significant downward movement for the gold producer.

The sharp decline followed market speculation about a potential merger with Vault Minerals. Analysis from Macquarie suggested that a combined entity could become Australia's second-largest primary listed gold producer by output, potentially surpassing Evolution Mining. However, investors appeared to react negatively to the merger speculation, possibly due to concerns about integration challenges, dilution risks, or uncertainty regarding the deal terms.