The Rulebook Rewrote Itself: Where AAA and JAMS Now Stand on Mass Filings

For most of the last decade, the arbitration providers were bystanders to a fight conducted through their own fee schedules. A claimants' firm would assemble an inventory, file it in one motion, and the provider's per-case administrative charges would do the rest. The respondent's exposure ran into seven or eight figures before a single arbitrator read a single claim. The provider's role was to invoice.

That is no longer the arrangement. Both major American providers now operate dedicated mass filing regimes with their own thresholds, their own gatekeepers, and — critically — their own fee architecture. Understanding which regime applies, and whether it applies by discretion or by consent, is now the first question in any mass arbitration engagement.

The AAA: discretionary reach, flattened front end

The AAA moved first, introducing Supplementary Rules for Multiple Case Filings in August 2021 and consolidating the approach into dedicated Mass Arbitration Supplementary Rules thereafter, with a significantly revised fee schedule effective January 2024.

The reach is broad. In consumer and employment matters, the rules apply where twenty-five or more similar demands are filed by or against the same party and claimants are represented by the same or coordinated counsel; a higher threshold applies outside those contexts. The decisive structural point is that the AAA applies the rules at its own discretion. A respondent cannot engineer its way in or out through drafting alone, and neither can a claimants' firm engineer its way out by fragmenting an inventory across nominally separate filings.

The fee change is the headline. Under the prior consumer schedule, a filing of one thousand demands generated up-front costs in the range of $1.775 million to $2.275 million — filing fees of $375,000 to $500,000 layered under case management fees of $1.4 million to $1.775 million. All of it fell due before an arbitrator was seated.

The January 2024 schedule replaced per-case initiation charges with a flat initiation fee of $11,250, split $3,125 to the claimant side and $8,125 to the business side, and eliminated case management fees altogether. Per-case fees resume only after the initiation stage, in a band of roughly $125 to $325 depending on volume, with final fees of $600 to $750 per case at the merits end and arbitrator compensation at $300 per hour in consumer matters.

The practical effect is a redistribution rather than a reduction. Filings that never reach merits are now dramatically cheaper to defend. Filings that do reach merits still carry a per-claim cost curve — which is precisely the incentive the AAA appears to have intended.

The Process Arbitrator, and the affirmation

Two procedural additions matter as much as the fees.

The first is the Process Arbitrator, a neutral appointed to resolve administrative disputes — filing compliance, fee allocation, batching mechanics, whether a given claimant belongs in the proceeding — before merits arbitrators are appointed. Merits arbitrators may review those determinations under an abuse-of-discretion standard. The role concentrates threshold fights in one place rather than replicating them thousands of times.

The second is the affirmation requirement: filing counsel must attest that the information supplied for each demand is accurate to the best of their knowledge and that the filings are not frivolous. This is a direct response to earlier campaigns that produced claimants who could not be located, had no relationship with the respondent, or turned out not to exist. It functions as the arbitral analogue of Rule 11 certification, and it materially raises the cost of assembling an inventory without vetting it.

The AAA also requires a global mediation within 120 days of filing confirmation — a mandatory settlement window with no JAMS equivalent.

JAMS: narrower trigger, and a consent problem

JAMS issued Mass Arbitration Procedures and Guidelines effective May 2024. The trigger is a single figure — seventy-five claimants represented by the same or coordinated counsel — applied without regard to whether the dispute is consumer, employment, or commercial.

The fee structure is materially lighter at the front end: a single filing fee of $7,500 in total, with the claimant share capped at $2,500 and the business bearing $5,000. Appointment fees of $2,000 to $3,500 attach per appointment rather than per case, and a case management fee of thirteen percent of arbitrator compensation applies, alongside the Process Administrator's hourly time.

But the defining feature of the JAMS regime is not its pricing. It is consent. The procedures apply only where the parties have expressly adopted them. A company that named JAMS as its provider but said nothing about the Mass Arbitration Procedures cannot reach for them when ten thousand demands arrive. That single distinction does more to determine outcomes than any fee table, and it is the reason clause drafters who want the JAMS regime must name it in terms.

What the divergence means in practice

Read together, the two regimes create a genuine strategic choice at the drafting stage rather than at the demand stage.

Naming the AAA imports a discretionary regime that will apply whether or not either side wants it, with a gatekeeper the respondent does not select and a mandatory mediation the respondent cannot avoid. Naming JAMS without expressly adopting its mass procedures imports nothing at all — the ordinary rules apply to ten thousand demands the same way they apply to one.

Neither is inherently the better answer. What is no longer defensible is treating the provider designation as boilerplate. The provider clause is now a substantive allocation of risk, and it is decided years before anyone knows whether an inventory will arrive.