HIGHLIGHTS

ICSID Annulment Committee Fully Sets Aside US$33.2 Million Award Against The Gambia in Landmark Ruling

1. Background

The dispute arose from events in 2015, when the Gambian government under former President Yahya Jammeh took over a shrimp farming and processing operation located at Pirang and Sanyang on the West Coast. The operation was run by Western African Aquaculture Ltd, a company owned by Swedish and Australian nationals.

The investors alleged that the government’s takeover amounted to an unlawful expropriation of their investment. They subsequently commenced arbitration before the International Centre for Settlement of Investment Disputes (ICSID) in Western African Aquaculture Ltd, Kurt Lennart Hansson and Martje Bolt Hansson v. Republic of The Gambia, ICSID Case No. ARB/18/10.

In March 2024, the arbitral tribunal ruled in favour of the investors and ordered The Gambia to pay substantial compensation, together with interest.

Rather than satisfy the award, the Gambian government under President Adama Barrow challenged it through the annulment mechanism provided under the ICSID Convention.

2. The 2026 Annulment Decision

On 17 July 2026, the ICSID ad hoc Annulment Committee delivered its decision and annulled the March 2024 award in full, including the accompanying interest.

The Committee’s reasoning focused on a fundamental jurisdictional issue: whether The Gambia had actually provided valid consent to ICSID arbitration.

According to the Committee, the original tribunal had not sufficiently demonstrated how Gambian domestic law created the State’s consent to submit the dispute to ICSID arbitration. Because consent is a foundational requirement for ICSID jurisdiction, the failure to properly establish it undermined the tribunal’s jurisdiction to hear the dispute.

The practical consequences for The Gambia are substantial. The Gambian government has stated that the decision removes exposure of more than US$32 million from the national budget and allows the State to recover approximately US$213,000 in arbitration costs.

The Attorney General’s Chambers, which conducted the challenge with a joint Gambian and international legal team, described the decision as vindicating the State’s position that it had never validly consented to arbitrate the dispute.

3. Legal Framework: Annulment under the ICSID Convention

A. Article 52 and the Grounds for Annulment

Article 52 of the ICSID Convention establishes a limited and exhaustive set of grounds on which an award may be annulled.

These include:

1. Improper constitution of the tribunal;
2. Manifest excess of powers;
3. Corruption on the part of a tribunal member;
4. Serious departure from a fundamental rule of procedure; and
5. Failure to state the reasons on which the award is based.

Importantly, annulment is not an appeal.

An ad hoc Annulment Committee does not reconsider the merits of the dispute as an appellate court would. It cannot simply substitute its own interpretation of the facts or law for that of the original tribunal.

The purpose of annulment is instead to ensure that the arbitral process and award comply with the fundamental requirements established by the ICSID Convention.

B. Why Full Annulment Is Exceptional

A complete annulment of an ICSID award is comparatively rare.

Successful annulment applications frequently result in partial annulment, where only a particular portion of an award is set aside while other findings remain intact. For example, an annulment committee may invalidate a finding concerning damages while preserving the tribunal’s findings on liability.

Full annulment becomes particularly significant where the defect affects the jurisdictional foundation of the entire arbitration.

In the present case, the Committee’s finding concerning the absence of a sufficiently established basis for The Gambia’s consent went to the very authority of the original tribunal to adjudicate the dispute. As a result, the entire award was annulled.

4. Consent to Arbitration: The Central Jurisdictional Issue

Consent is the cornerstone of ICSID jurisdiction under Article 25 of the ICSID Convention.

ICSID arbitration generally requires consent from both the investor and the host State. Such consent may arise through different legal instruments, including:

• Bilateral investment treaties;
• Investment contracts;
• Domestic investment legislation; or
• Other legally valid instruments establishing consent.

The present dispute is particularly significant because the asserted basis for The Gambia’s consent was rooted in domestic legislation rather than a conventional bilateral investment treaty.

Where domestic legislation is relied upon as an offer to arbitrate, a tribunal must carefully determine whether the legislation actually constitutes a standing offer by the State to submit qualifying disputes to ICSID arbitration.

The Annulment Committee’s decision demonstrates the importance of tracing this legal chain with precision. A general statement in domestic investment legislation may not, without sufficient legal analysis, establish the State’s consent to ICSID arbitration.

5. Why the Decision Matters

1. Guidance on Domestic-Law-Based Consent

The decision provides important guidance for arbitral tribunals and States concerning the degree of legal scrutiny required where ICSID jurisdiction is based on national investment legislation.

Tribunals must carefully identify the precise statutory provision relied upon and determine whether, as a matter of domestic law, it constitutes a valid offer to arbitrate.

2. Significance for Developing States

The decision is particularly relevant for developing and capital-constrained States.

It demonstrates that a State may successfully challenge a substantial ICSID award where there is a genuine and fundamental jurisdictional defect. At the same time, the case highlights the importance of properly resourcing and presenting jurisdictional objections.

3. Reinforcement of the Limited but Real Role of Annulment

ICSID annulment is deliberately narrow and cannot be used as an ordinary appeal.

Nevertheless, the decision demonstrates that annulment can have a decisive effect where an award suffers from a fundamental defect falling within Article 52. Total annulment is legally available where the jurisdictional foundation of an award is fundamentally unsound.

4. Fiscal Consequences for Respondent States

The financial implications are considerable.

The removal of a liability exceeding US$32 million can have a direct impact on the fiscal planning of a relatively small economy such as The Gambia. It may also influence how States evaluate their exposure to future investor-State disputes and the allocation of resources toward international arbitration defence.

6. Implications for Foreign Investors and Host States

A. Implications for Investors

For foreign investors, the decision serves as a reminder that relying exclusively on domestic investment legislation as the basis for ICSID arbitration may involve jurisdictional uncertainty.

Where treaty protection is available, investors may prefer investment structures supported by bilateral or multilateral investment treaties, depending on the circumstances.

Investors considering investments in jurisdictions where protection is primarily derived from domestic legislation should therefore carefully examine:

• Whether the legislation contains an arbitration offer;
• The scope of that offer;
• The applicable definition of an investor and investment;
• Whether the legislation provides consent specifically to ICSID arbitration; and
• Whether the relevant statutory provisions were in force at the time of the investment and dispute.

B. Implications for Host States

For host States, the decision underscores the importance of examining the precise legal basis of consent at the earliest stage of an investment dispute.

States should raise genuine jurisdictional objections promptly and ensure that the tribunal is required to establish the legal foundation of its jurisdiction before proceeding to the merits.

The case also demonstrates that jurisdictional objections should not necessarily be treated as secondary issues. Where consent itself is defective, the consequences can extend to the validity of the entire award.

7. International Legal Significance

The decision contributes to the developing body of ICSID annulment jurisprudence concerning consent derived from domestic investment legislation.

This issue is particularly relevant in jurisdictions where investment protection has historically depended more heavily on national investment codes than on an extensive network of bilateral investment treaties.

The ruling is therefore likely to be considered in future proceedings involving questions such as:

• Whether domestic legislation constitutes an offer to arbitrate;
• How consent must be established under Article 25;
• The extent to which domestic law governs the existence of State consent;
• Whether a tribunal has exceeded its powers by assuming jurisdiction without adequately establishing consent; and
• The circumstances in which a jurisdictional defect can justify complete annulment.

8. Conclusion

The full annulment of the award in Western African Aquaculture Ltd, Kurt Lennart Hansson and Martje Bolt Hansson v. Republic of The Gambia represents a significant development in ICSID arbitration.

Although the decision does not alter the narrow and exceptional nature of the annulment mechanism under Article 52 of the ICSID Convention, it demonstrates the potentially decisive consequences of a jurisdictional defect.

The central issue was not whether the investors had established their substantive claims, but whether the original tribunal had adequately established the legal foundation for The Gambia’s consent to ICSID arbitration.

The decision therefore reinforces a fundamental principle of investor-State arbitration: before an arbitral tribunal can determine the merits of a dispute, it must first establish that it possesses jurisdiction.

For States, investors and arbitration practitioners, the case provides an important illustration of the need for rigorous analysis of consent where jurisdiction is derived from domestic investment legislation. It also demonstrates that, in exceptional circumstances, an ICSID award may be annulled in its entirety where the defect reaches the very foundation of the tribunal’s jurisdiction.

References

1. ICSID Convention, 1965 — Articles 25 and 52.
2. Western African Aquaculture Ltd, Kurt Lennart Hansson and Martje Bolt Hansson v. Republic of The Gambia, ICSID Case No. ARB/18/10.
3. ICSID — Decision of the Ad Hoc Committee, July 2026.
4. Jus Mundi / Daily Jus — Coverage of the ICSID Annulment Committee decision, July 2026.
5. Government of The Gambia, Office of the Attorney General and Minister of Justice — Official statements concerning the annulment decision.
6. italaw.com — Case record concerning Western African Aquaculture v. The Gambia.