Zeph v Australia: Swiss Court Confirms Limits on Treaty Protection After Corporate Restructuring

The Swiss Federal Supreme Court has upheld an arbitral tribunal's dismissal of an A$300 billion claim brought by Zeph Investments Pte Ltd (Zeph), a Singaporean company controlled by Clive Palmer, against the Commonwealth of Australia.

The Court upheld the Tribunal's conclusion that Zeph was not an investor holding a protected investment under the agreement establishing the ASEAN-Australia-New Zealand Free Trade Area (AANZFTA) and separately rejected allegations of arbitrator bias. The claim failed on this threshold jurisdictional basis and not on the merits of Zeph’s expropriation allegations.

The decision is a reminder that investment treaty protection depends on substance, timing and evidence. A foreign holding company may not be enough if the claimant cannot show that it made a real economic contribution to the investment, particularly where the structure was introduced after the dispute had already emerged.

Background and Procedural History

The dispute arose out of the widely publicised and long-running conflict between entities within the Mineralogy Group and the Government of Western Australia concerning iron ore projects in the Pilbara region.

In 2012, Mineralogy and one of its subsidiaries sought approval for the Balmoral South Iron Ore Project pursuant to a legislated agreement it had held with the State since 2001 (the State Agreement). The WA Government refused to treat the proposal as valid under the agreement, resulting in arbitration before former High Court Justice Michael McHugh.

Mineralogy subsequently obtained two favourable arbitral awards. The first held that the WA Government had breached the State Agreement. The second determined that Mineralogy was not precluded from pursuing damages arising from those breaches.

However, in 2020, the WA Government enacted the Iron Ore Processing (Mineralogy Pty Ltd) Agreement Amendment Act 2020 (WA) (the Amendment Act), which effectively extinguished the arbitral awards and invalidated the underlying arbitration agreements. Mineralogy challenged the legislation in the High Court of Australia, but the legislation was unanimously upheld.[1]

After becoming the direct shareholder of Mineralogy through a 2018-2019 corporate restructuring, Zeph commenced arbitration against the Commonwealth of Australia in March 2023 under Chapter 11 of the Agreement Establishing the AANZFTA. Zeph claimed that the Amendment Act amounted to an expropriation of its investment and otherwise contravened Australia's obligations under the treaty.

The arbitration proceeded before a Tribunal constituted under the UNCITRAL Arbitration Rules and administered by the Permanent Court of Arbitration.

Why Zeph failed to qualify as a protected investor

In September 2025, the Tribunal dismissed Zeph’s claim for want of jurisdiction. The central jurisdictional issue before the Tribunal was whether Zeph qualified as a protected "investor" holding a protected "investment" within the meaning of Chapter 11 of the AANZFTA.

Zeph contended that, as a Singapore-incorporated company and the direct shareholder of Mineralogy, it owned assets that fell within the treaty's definition of an investment. Australia argued that treaty protection required more than the ownership of assets and that an investor must have made a genuine contribution or commitment of economic resources to the relevant investment.

The Tribunal held that the definition of “investment” must be read together with the concepts of "covered investment" and "investor", interpreting those provisions in light of their text, context and the purpose of the AANZFTA. The Tribunal concluded that Chapter 11 contemplates the commitment of economic resources and therefore requires an investor to have made a contribution to the relevant investment.[2]

Zeph argued that it satisfied that requirement through the 2018-2019 corporate restructuring pursuant to which it acquired Mineralogy through a share-swap transaction.

The Tribunal rejected that contention. While the share-swap transaction validly transferred ownership of Mineralogy to Zeph, the Tribunal concluded that Zeph did not contribute economic value in exchange for the Mineralogy shares because, immediately prior to the transaction, it had no assets or liabilities of substance beyond its subscriber share capital. Accordingly, the restructuring did not constitute the making of a protected investment for the purposes of Chapter 11.[3]

Zeph also argued that it contributed to the investment through its management of Mineralogy and by allowing profits to remain within the company rather than being distributed as dividends.

The Tribunal rejected both arguments, finding insufficient evidence that Zeph provided distinct management services or expertise to Mineralogy[4] and concluded that retained profits belonged to Mineralogy, rather than constituting resources contributed by Zeph.[5]

Finally, Zeph contended that Australia should be precluded from denying Zeph’s status as a protected investor because various Australian agencies and regulators had previously recognised it as a foreign entity under Australian law.

The Tribunal rejected that argument, finding that Australia had never made a clear or unequivocal representation that Zeph qualified as a protected investor or held a protected investment under Chapter 11 of the AANZFTA.[6] The decisions relied upon by Zeph, including decisions of ASIC, the ATO and FIRB to treat Zeph as a foreign entity, were made under domestic legislation and did not concern, or inform, the interpretation or application of the AANZFTA.[7]

Having found that Zeph had not made a qualifying contribution through the restructuring, its alleged management activities or the retention of profits, the Tribunal concluded that Zeph was neither a protected investor nor the holder of a protected investment under Chapter 11 of the AANZFTA and therefore lacked jurisdiction to determine the claim. The Tribunal awarded Australia its legal costs.

Why the Swiss Court refused to intervene

As the arbitration was seated in Geneva, the award was subject to the supervisory jurisdiction of the Swiss Federal Supreme Court under Chapter 12 of the Swiss Private International Law Act.

Zeph appealed to the Swiss Federal Supreme Court seeking to set aside the award. It argued that the Tribunal had incorrectly interpreted the concepts of "covered investment", "investment" and "investor" under Articles 2(a), 2(c) and 2(d) of Chapter 11 of the AANZFTA. Zeph also challenged the Tribunal's conclusions that the 2018-2019 corporate restructuring, its alleged management of Mineralogy, and the retention of profits and dividends did not constitute a sufficient contribution to qualify for protection under Chapter 11.

The Court rejected those arguments and found no basis to disturb the Tribunal's interpretation of the treaty. Applying Articles 31 and 32 of the Vienna Convention on the Law of Treaties, the Court held that the Tribunal was entitled to interpret Articles 2(a), 2(c) and 2(d) together and in light of the text, context and purpose of the AANZFTA. [8] It accepted the Tribunal's reasoning that the protections in Chapter 11 apply to a "covered investment" and that, read as a whole, the treaty contemplates active investment involving the commitment of economic resources rather than the mere ownership of assets.[9]

The Court emphasised that while it could review questions of treaty interpretation and jurisdiction, it was generally bound by the Tribunal's factual findings.[10] Accordingly, it declined to revisit findings concerning the value of the shares issued in the restructuring or the Tribunal's assessment of the evidence relating to management activities and retained profits.[11] Having accepted those findings, the Court upheld the Tribunal’s conclusion that Zeph was not an investor holding a protected investment under the AANZFTA.[12]

Zeph also commenced separate revision proceedings alleging that the arbitrators lacked independence and impartiality. It argued that information identified after the award had been delivered demonstrated that the arbitrators had devoted insufficient time to the arbitration and that aspects of the award itself evidenced bias.[13]

The Court dismissed the application. It held that the matters relied upon by Zeph were apparent from the award itself when it was received. As a result, those matters could have been raised in Zeph's appeal against the award within the applicable 30-day appeal period and did not constitute newly discovered grounds capable of supporting revision proceedings. The Court further held that Zeph's complaints largely reflected disagreement with the Tribunal's reasoning and conclusions rather than evidence of a lack of independence or impartiality.[14]

The Court awarded Australia its legal costs in both applications.

Conclusion and key takeaways

The decision confirms that, in the circumstances of this case, Zeph did not qualify as an investor holding a protected investment under Chapter 11 of the AANZFTA. The judgment of the Swiss Federal Supreme Court marks the apparent end of one of the largest investment treaty claims brought against Australia and adds to Australia’s recent record of successfully resisting high-profile investment treaty claims.

The key takeaways for arbitration practitioners, investors and respondent States are:

1. Treaty protection cannot be manufactured retrospectively. A corporate restructuring is unlikely to create a protected foreign investment where one did not previously exist. This reinforces that nationality planning is most defensible when undertaken before a dispute crystallises and that a restructuring undertaken against the backdrop of an existing dispute may attract intense scrutiny.
2. The investor’s corporate structure may be determinative of jurisdiction in ISDS claims. Accordingly, due attention should be given in ISDS claims to matters such as corporate ownership structures, the source of capital and contributions, the timing of acquisitions and the evidence establishing that the claimant itself made or held the relevant investment.
3. Attempts to reframe domestic litigation as treaty claims simply because there is a foreign ownership element are susceptible to challenge. The Court's decision reinforces that investment treaty protection depends on the substance of an investor's role and investment, not merely the existence of a foreign holding company within a corporate structure.
4. Set-aside proceedings are not a second bite at the factual cherry. The Court’s decision illustrates the limits of curial review in investor-State arbitration. Even where jurisdiction is challenged, a supervisory court may be slow to revisit factual findings made by the tribunal, particularly where the complaint is in substance disagreement with the tribunal’s assessment of the evidence.