Supreme Court on Non-Signatories in Arbitration: When Can They Be Joined?
When a non-signatory’s rights depend on the dispute
Can a person who never signed an arbitration agreement nevertheless be treated as a party to the arbitration? The answer depends on the person’s legal connection to the agreement and the dispute, not simply on whether the eventual decision may affect them.
In Hemant D. Shah HUF & Anr. v. Chittaranjan D. Shah HUF & Ors., the Supreme Court considered that question in a dispute concerning a commercial property and successive partnership arrangements. It held that two non-signatories could be treated as “veritable parties” on a prima facie basis because their claimed rights under later arrangements depended on the validity of an earlier, disputed retirement deed. The final determination remained for the arbitral tribunal.
| Case | Hemant D. Shah HUF & Anr. v. Chittaranjan D. Shah HUF & Ors. |
| Court and Bench | Supreme Court of India | J.B. Pardiwala and K. Vinod Chandran, JJ. |
| Decision | 12 October 2026 | 2026 INSC 1111 |
| Proceeding | Civil Appeal arising out of SLP (C) No. 26474 of 2026 |
| Holding | Third and fourth respondents treated as prima facie veritable parties; limitation and estoppel left to the tribunal. |
Background of the dispute
The dispute concerned a 3,500-square-foot commercial unit in Mumbai, originally acquired by a partnership firm. A partnership deed dated 9 December 1985 contained an arbitration clause. The appellants later challenged a retirement deed dated 3 July 1995, alleging that it was forged and asserting that they had never left the partnership.
The firm’s constitution changed over time. The third and fourth respondents claimed rights in the property through later partnership arrangements. Those claimed rights depended, in part, on whether the appellants had validly retired in 1995. The Bombay High Court declined to include the third and fourth respondents in the arbitration because they had not signed the 1985 deed.
Why the non-signatories were connected to the arbitration
The Supreme Court traced the legal consequences of the competing versions. If the 1995 retirement deed were invalid, the parties’ rights could revert to the position under the 1985 partnership deed. That could affect the rights claimed by the third and fourth respondents under the later arrangements.
The Court did not rely merely on the respondents’ interest in the property. It focused on the relationship between the disputed deed and the rights they claimed: the validity of those later rights could not be examined without considering whether the earlier retirement had taken place. On those facts, their rights would be substantially affected by the arbitration dispute.
The veritable-party test
The Court considered the principles in Cox & Kings Ltd. v. SAP India Pvt. Ltd. and Hindustan Petroleum Corporation Ltd. v. BCL Secure Premises Pvt. Ltd. The broader principle is that signing is not the only possible evidence of consent to arbitrate. A non-signatory’s relationship with the signatories and conduct concerning the underlying contract may show an intention to be bound. The inquiry is fact-specific, and no single consideration is decisive.
| Relevant consideration | What the court or tribunal examines |
| Intent and relationship | Whether the non-signatory’s relationship and conduct show an intention to be bound. |
| Subject matter and transactions | Whether the claims concern a common subject and linked or composite transactions. |
| Participation and impact | Whether the non-signatory participated in the arrangement and whether the dispute substantially affects its claimed legal rights. |
The Court clarified that the Group of Companies doctrine was not the basis for its conclusion in this case. Its reasoning rested on the close connection between the disputed retirement deed, the later partnership arrangements and the respondents’ claimed rights in the property.
The referral court’s role and the tribunal’s final decision
At the Section 11 stage, the referral court must form a prima facie view on whether a non-signatory is a veritable party. That initial assessment does not finally resolve every factual or jurisdictional question. The arbitral tribunal retains authority to examine the evidence and decide whether the non-signatory is ultimately bound, including under Section 16 of the Arbitration and Conciliation Act, 1996.
| Stage | Role |
| Section 11 referral | The court makes a prima facie assessment of whether the non-signatory is a veritable party. |
| Arbitral proceedings | The tribunal examines the evidence and decides whether its jurisdiction extends to the non-signatory. |
| Issues left open here | Limitation and whether the appellants were estopped from joining the respondents because they were absent from earlier arbitration proceedings. |
The Supreme Court expressly left the limitation and estoppel objections to the tribunal. Its preliminary finding did not prevent the tribunal from reaching a different conclusion after considering the evidence.
What the decision does not establish
The ruling does not mean that anyone whose interests may be affected by an arbitration must be joined. In Hindustan Petroleum, the Supreme Court considered a subcontractor’s attempt to invoke an arbitration agreement between a principal employer and a main contractor. It held that a commercial connection and related arrangements did not, without more, establish that the subcontractor was a veritable party to that arbitration agreement.
Read together, the decisions require a legally meaningful connection to the underlying contractual relationship and dispute. A commercial association, financial interest or possible practical consequence of an award is not, by itself, sufficient.
Practical implications
For a party seeking to include a non-signatory, the application should identify the legal path through which that person claims rights and explain how the dispute will determine or substantially affect those rights. The relevant agreements and the links between successive transactions should be placed before the court or tribunal.
A non-signatory resisting joinder may distinguish a direct legal connection from a commercial or factual association. It may explain whether its rights arise independently, whether it participated in or adopted the relevant arrangement, and whether the dispute can be decided without determining its rights.
Conclusion
Hemant D. Shah HUF confirms that the absence of a signature is not always decisive. A non-signatory may be treated as a party where the dispute directly engages rights claimed through connected contractual arrangements. But the decision does not create a general rule based on impact alone: its conclusion followed from the specific link between the disputed retirement deed, later partnership arrangements and the respondents’ claims over the property.
The referral court’s finding was preliminary. The arbitral tribunal retained the final say on jurisdiction and could consider limitation and estoppel. The central question is whether the non-signatory is merely affected by the outcome, or whether the dispute puts that person’s legally claimed rights directly in issue and connects those rights closely to the underlying arbitration agreement.
Disclaimer: This article is for general legal information and is not a substitute for advice based on the facts and procedural record of a particular matter.
Source: Supreme Court of India, Hemant D. Shah HUF & Anr. v. Chittaranjan D. Shah HUF & Ors., Civil Appeal arising out of SLP (C) No. 26474 of 2026, decided 12 October 2026; 2026 INSC 1111. See also Cox & Kings Ltd. v. SAP India Pvt. Ltd., (2024) 4 SCC 1, and Hindustan Petroleum Corporation Ltd. v. BCL Secure Premises Pvt. Ltd., 2025 INSC 1401.