AT&T Mobility LLC v. Concepcion

Holding that a ban on collective-action waivers in those contracts worked to "disfavor arbitration"

Stolt-Nielsen S.A. v. Animalfeeds Intr.

Holding that a prudential ripeness argument was waived

Arthur Andersen LLP v. Carlisle

Holding that the FAA "creates substantive federal law ... requiring courts to place [arbitration] agreements upon the same footing as other contracts," but that nothing in the FAA "purports to alter background principles of state contract law regarding the scope of [arbitration] agreements"

American Pipe Construction Co. v. Utah

Holding the commencement of a class action "suspends the applicable statute of limitations as to all asserted members of the class who would have been parties had the suit been permitted to continue as a class action"

Green Tree Fin. Corp. v. Bazzle

Holding that "gateway matters," such as the scope of an arbitration provision, should be determined by courts and not arbitrators

Armendariz v. Foundation Health Psychcare Services, Inc.

Holding unilateral arbitration provision substantively unconscionable

Little v. Auto Stiegler, Inc.

Holding "procedural element" established where employer had "imposed on [employee] an adhesive arbitration agreement"; observing "few employees are in a position to refuse a job because of an arbitration requirement"

Stirlen v. Supercuts, Inc.

Holding that the element of procedural unconscionability is established where the challenged clause is part of a contract of adhesion

Jock v. Sterling Jewelers Inc.

Holding that an arbitrator did not exceed her powers by ruling that class arbitration was allowed under an agreement lacking an express class provision

Goldman v. KPMG LLP

Holding that plaintiff signatories were not equitably estopped from refusing to arbitrate under the terms of an agreement because their "allegations depend solely on the actions of [defendant nonsignatories], not on the terms of the operating agreements, for their success."

Rule 23 - Class Actions

Holding that, to certify a class, the court must find that "questions of law or fact common to class members predominate over any questions affecting only individual members"

Section 2 - Validity, irrevocability, and enforcement of agreements to arbitrate

Granting federal jurisdiction where there is "a transaction involving [interstate] commerce"

Section 1670.5 - Contract or clause unconscionable

Adopting UCC section 2-302 and making it generally applicable to all contracts

Section 1654 - Interpretation against party causing uncertainty

Codifying the doctrine of contra proferentem

Section 1102.6b - Good faith effort to obtain disclosure notice concerning special tax or assessments