Here are 6 of the best mergers and acquisitions on the ASX and 6 of the worst deals!

April 28, 2025 07:53 PM AEST | By Team Kalkine Media
 Here are 6 of the best mergers and acquisitions on the ASX and 6 of the worst deals!

Highlights:

  • Major ASX-listed companies have pursued mergers and acquisitions to strengthen market share and capabilities.

  • Healthcare, banking, energy, and engineering sectors feature prominently in landmark deals.

  • Outcomes have varied significantly, with some mergers driving strong growth while others faced critical challenges.

Mergers and acquisitions on the ASX span across multiple sectors, including healthcare, banking, energy, and retail. Companies aim to expand capabilities, enter new markets, or consolidate power within their industries. The outcomes of these transactions often shape the long-term trajectory of the involved businesses.

Pro Medicus Acquires Visage

Pro Medicus (ASX:PME) completed the acquisition of US radiology software firm Visage during a financial crisis period. The acquisition enabled Pro Medicus to offer advanced imaging data solutions. Despite commanding only a modest share of the global market, the company operates with strong margins and a prestigious client base, leading to a significant rise in its market value over time. ASX Healthcare Stocks like PME have showcased strong growth in technological innovation within medical imaging.

Ramsay Healthcare’s Acquisition of Affinity

Ramsay Healthcare (ASX:RHC) expanded its presence by acquiring Affinity Healthcare, which positioned it as the leading private hospital operator in Australia. Following the acquisition, Ramsay achieved extensive share price growth over the subsequent decade. Although recent performance has been impacted by market pressures, the initial merger significantly elevated Ramsay’s market position.

Westpac Merges with St George

Westpac’s acquisition of St George marked a major consolidation in the Australian banking sector. Although the merged operations have seen a reduction in branch networks over time, the deal fortified Westpac’s standing in the mortgage market. Westpac and CBA maintain close competition for the highest share of home lending in Australia.

Formation of WorleyParsons

The combination of Worley and Parsons delivered a robust platform offering engineering, procurement, and project management services to major energy sectors. Following the merger, the newly formed company secured numerous long-term contracts and expanded rapidly before facing broader sector challenges during commodity downturns.

Sigma Healthcare’s Strategic Merger with Chemist Warehouse

Sigma Healthcare (ASX:SIG) and Chemist Warehouse combined forces to create the largest pharmacy franchise in Australia. This merger allowed Chemist Warehouse to achieve an ASX listing while enhancing Sigma’s already extensive wholesale and distribution networks. Sigma’s strengthened position through the integration demonstrates the significant influence of scale in the healthcare retail sector.

Woodside Acquires BHP’s Petroleum Division

Woodside’s acquisition of BHP’s petroleum assets enabled the company to establish itself among the largest independent energy producers globally. BHP, on the other side, used the transaction to reorient its portfolio away from fossil fuels. The transaction provided added scale to Woodside’s operations across major Australian offshore fields.

Challenging ASX Mergers and Acquisitions

Not every major acquisition on the ASX has delivered positive outcomes. Several notable transactions encountered significant difficulties soon after completion.

Wesfarmers’ Acquisition of Homebase

Wesfarmers’ entry into the United Kingdom’s retail market through the purchase of Homebase resulted in heavy losses. Major missteps included the removal of key management personnel and failure to adapt the product offering to local market preferences. The entire operation was later sold for a nominal sum, marking a substantial setback.

Perpetual’s Acquisition of Pendal

Perpetual’s takeover of Pendal faced significant challenges, including asset outflows and an overall tough environment for active fund management. The acquired business underperformed expectations, and the transaction resulted in a substantial writedown of value within a short period.

M2 Group and Vocus Merger

The merger of M2 Group and Vocus aimed to build stronger bargaining power within the telecommunications sector. However, the business struggled to integrate operations effectively, leading to revenue downgrades and leadership changes shortly after completion.

Slater & Gordon’s Purchase of Quindell

Slater & Gordon’s acquisition of Quindell’s professional services division ended in legal disputes and significant impairments. Following irregularities in Quindell’s financial reporting, Slater & Gordon had to book major losses, ultimately leading to financial distress and restructuring efforts.

Rio Tinto’s Acquisition of Riversdale

Rio Tinto’s purchase of Riversdale Mining resulted in major impairments after production challenges surfaced post-acquisition. Investigations revealed discrepancies in the initial resource estimates, leading to heavy financial and reputational costs for the company.

Boral’s Purchase of Headwaters

Boral’s acquisition of Headwaters aimed to diversify revenue streams and reduce capital intensity. However, operational challenges in the US market and intensified competition led to underperformance. The deal failed to meet original strategic goals, drawing criticism from market participants.


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