The Supreme Court has ruled that a non-signatory to an arbitration agreement can be compelled to join arbitration proceedings when the dispute substantially affects that party's rights or obligations. The Court drew on the 'group of companies' doctrine and the principle that arbitration's consensual basis may be extended where parties are so intertwined that separating them defeats the purpose of dispute resolution. This ruling clarifies the outer boundary of arbitral jurisdiction under the Arbitration and Conciliation Act, 1996.

Arbitration is fundamentally consensual — only parties who have signed an arbitration agreement are ordinarily bound by it. This is rooted in the principle of privity of contract. However, complex commercial transactions often involve multiple entities — parent companies, subsidiaries, guarantors, affiliates — who participate in a deal without formally signing every document.

The Supreme Court's ruling applies the 'group of companies' doctrine, which recognises that where a non-signatory is so closely connected to the transaction and the dispute that excluding them would fragment the resolution or render the arbitral award ineffective, they may be joined as a party. The test is not merely formal signature but substantive involvement: Did the non-signatory's conduct show implied consent? Was the dispute's subject matter directly linked to their rights?

In Indian law, this doctrine was significantly debated after Cox and Kings Ltd v. SAP India Pvt Ltd (2023), where a five-judge Constitution Bench affirmed the group of companies doctrine as a legitimate tool under Section 8 and Section 45 of the Arbitration and Conciliation Act, 1996. The critical doctrinal question is whether a non-signatory's inclusion respects or violates party autonomy.

For CLAT PG aspirants, this connects to offer-acceptance and consideration doctrine (only consenting parties are bound), but in arbitration law it extends to corporate structures and implied consent through conduct — a nuance examiners test through passage-based application questions requiring doctrinal precision.