Israel Recalibrates: The Israeli Supreme Court Restores Consent as the Central Foundation for Joining Non-Signatories to Arbitration

International Arbitration Practice Group, AYR

In a significant development for international arbitration practitioners, Israel’s Supreme Court has issued a ruling that substantially realigns Israeli law with the consent-based approach that prevails across leading arbitral jurisdictions and in the dominant body of international arbitration scholarship. The decision in TAI Investments & Trade Ltd. v. Fishman, LCA 66369-02-25 resolves a tension that had been building in Israeli doctrine for over a decade - on the scope of joining non-signatories to an arbitration proceeding - and the resolution matters well beyond Israel’s borders.

The Challenge - Joinder in International Arbitration Cases

A common challenge in arbitration is ensuring that a single proceeding can effectively encompass all relevant parties. In practice, the arbitration clause is often embedded in a contract that does not capture the full constellation of participants ultimately involved in, or affected by, the transaction or the dispute. It is therefore not uncommon for parties to seek the joinder of additional respondents who never signed the arbitration agreement, both to avert fragmented, parallel proceedings and to secure a coherent and commercially sensible resolution.

As the joinder of additional parties becomes common practice, a persistent concern remains that arbitration - whose legitimacy ultimately rests on the parties' consent - may be extended to encompass parties who never agreed to arbitrate in the first place.

International arbitration scholarship has long warned against precisely this slippage. For instance, Gary Born, in International Commercial Arbitration (3rd ed.), has long argued the recognised doctrines permitting non-signatory participation - agency, assumption, estoppel, succession - are consent-tracking mechanisms, not free-standing equitable powers. Specifically, Born cautions against reliance on veil-piercing or alter-ego theories as autonomous bases for arbitral jurisdiction, noting that such doctrines are highly jurisdiction-specific and ill-suited to serve as transnational rules of arbitral competence.

Similarly, in The landmark ICC Case No. 4131, Dow Chemical Company v. Isover Saint-Gobain (ICC 1982), which is frequently invoked as authority for extending an arbitration clause to corporate affiliates, the tribunal refrained from grounding its conclusion in corporate ties alone. Rather, the tribunal emphasized the non-signatories’ active role in the negotiation, conclusion, and performance of the contracts containing the arbitration clause - a consent-based inquiry, not a pure group-of-companies or veil-piercing analysis.

The Prior Framework under Israeli law: Three Circles of non-signatories

In this context, Israeli law has, for more than a decade, grappled with the tension between arbitration’s consensual foundation and the perceived need to prevent formalistic evasion by closely connected non-signatories. That tension was crystallised in Ronen v. Cohen (LCA 3925/12), in which the Court identified three “circles” that may justify a joinder of an additional party to an arbitration proceeding:

First, joinder is justified where interpretation of the arbitration agreement and the surrounding contractual matrix shows that the non-signatory consented to arbitrate; second, joinder is justified with respect to assignees, successors, or other legal substitutes standing in the place of a signatory; and third, joinder is justified in residual cases where a non-signatory, closely connected to a signatory, seeks to evade arbitration through reliance on formal legal separateness, typically corporate personality.

It was the third circle that caused the difficulty. Framed as a residual category addressing cases where a non-signatory closely connected to a signatory seeks to “evade” arbitration through reliance on formal legal separateness - typically corporate personality - the third circle attracted a body of district court decisions that were, to put it plainly, doing corporate law under the guise of arbitration law.

Courts relied on controlling shareholdings, managerial dominance, the “economic unity” of corporate groups, and veil-piercing language to compel non-signatories to arbitrate, often without identifying any distinct act of consent to arbitrate. The operative reasoning was that joinder was necessary to avoid outcomes that were “artificial” or “formalistic” - language strikingly close to corporate-law, rather than arbitration-law, reasoning.

The shift back to consent in Israeli case law

In TAI Investments, the Supreme Court was presented squarely with the question of whether a controlling shareholder - undisputedly a non-signatory - could be joined to an arbitration on the basis of corporate dominance and alleged abuse of corporate personality. The Court’s answer was unequivocal: jurisdiction in arbitration is founded exclusively on consent, and joinder is not a question of fairness or procedural efficiency, but of agreement.

Whilst the Court formally preserved the Ronen taxonomy, its reasoning strips the third circle of any independent normative function. The Court made clear that the residual “evasion” category cannot operate as an autonomous basis for joinder grounded in corporate control, good faith, or equitable considerations alone.

After TAI Investments, every legitimate joinder claim in Israeli law must ultimately resolve into either the first circle (consent, including implied consent properly derived from the contractual matrix) or the second (succession and substitution). Veil-piercing and alter ego reasoning are confined to their proper role in the analysis of substantive liability - a post-jurisdictional question - and cannot substitute for consent at the jurisdictional stage.

The Tai Investments decision also has practical consequences for the choice of law analysis in international proceedings. Where joinder is sought in international arbitration, the applicable law is frequently contested: one may point to the law governing the arbitration agreement, the law of the jurisdiction in which agency or succession is said to have arisen, or - in cases involving corporate doctrines - the law of the relevant corporate entity’s domicile.

The TAI Investments decision simplifies this analysis considerably. Because veil-piercing and alter ego theories are no longer available as autonomous jurisdictional bases under Israeli law, tribunals seated in Israel need not wade into the comparative law question of which jurisdiction’s corporate law applies, or whether the threshold for that jurisdiction’s veil-piercing doctrine has been met. The sole question is consent, determined by reference to the arbitration agreement and its proper law. This is a cleaner, more predictable framework - and one that is considerably more hospitable to international parties accustomed to operating within the consent-based orthodoxy of leading institutional rules.

Practical Takeaways

For practitioners advising on Israeli-seated arbitration, or on disputes with an Israeli party dimension, several points of practical consequence follow from this decision.

Joinder applications based purely on corporate control, group membership, or economic unity are now substantially weakened and (standing on that basis alone) are unlikely to succeed before Israeli courts or tribunals applying Israeli curial law. Any joinder strategy will need to be anchored in identifiable consent - through interpretation of the arbitration agreement, through agency, or through succession - rather than in equitable or corporate law reasoning.

For that reason, parties who wish to ensure that affiliates, parent companies, or controlling shareholders are bound by their arbitration agreements - or conversely, to preserve the integrity of a consent-limited arbitration clause - should attend carefully to the drafting of their arbitration clauses. Explicit inclusion or exclusion of affiliates and group entities, and clear provisions on the scope of “party” for the purposes of the arbitration agreement, will carry decisive weight in any subsequent joinder dispute.

Finally, the decision reinforces that liability questions - including the potential responsibility of shareholders, controllers, or corporate groups - are properly addressed at the merits stage, under the applicable substantive law. These are not questions for the jurisdictional analysis, and conflating the two risks both procedural invalidity and - for the winning party - enforceability problems at the recognition and enforcement stage.