During the Class Period, Turquoise Hill was a mineral-exploration and development company headquartered in Canada. Turquoise Hill’s sole material business was the operation and development of the Oyu Tolgoi mine, a copper and gold mine in southern Mongolia, which is jointly owned with Erdenes Oyu Tolgoi LLC (“EOT”), a state-owned investor representing the Government of Mongolia. During the Class Period, Turquoise Hill common stock traded on the New York Stock Exchange and Nasdaq, as well as on the Toronto Stock Exchange, under the ticker TRQ. Rio Tinto, which consists of Rio Tinto plc (a United Kingdom company) and Rio Tinto Limited (an Australian company), is one of the world’s largest metals and mining companies. An affiliate of Rio Tinto International Holdings Limited (“RTIH”) served as manager of the Oyu Tolgoi project. During the Class Period, various subsidiaries of Rio Tinto plc owned a controlling share of Turquoise Hill’s common stock. Following the Class Period, in 2022, Rio Tinto acquired Turquoise Hill and privatized the company.
This Action involves allegations that Rio Tinto and certain of its executives made material misrepresentations and omissions during the Class Period about the development of the Oyu Tolgoi mine and related delays and cost overruns. Lead Plaintiff alleges that Defendants violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) by making these alleged misstatements or controlling Rio Tinto when the misstatements were made. Defendants deny all allegations in the Action and deny any violations of the federal securities laws.
On October 14, 2020, this Action was filed in the United States District Court for the Southern District of New York (the “Court”), alleging violations of the federal securities laws.
On December 14, 2020, the Pentwater Funds moved for appointment as Lead Plaintiff and approval of its selection of counsel. On January 15, 2021, the Honorable Lewis J. Liman appointed the Pentwater Funds as Lead Plaintiff and approved Bernstein Litowitz Berger & Grossmann LLP as Lead Counsel.
On March 17, 2021, Lead Plaintiff filed and served the Amended Consolidated Complaint for Violations of the Federal Securities Laws asserting claims against defendants Luke Colton, Jean-Sebastien Jacques, Brendan Lane, Ulf Quellmann, Rio Tinto International Holdings Limited, Rio Tinto Limited, Rio Tinto Plc, Arnaud Soirat, Turquoise Hill Resources Ltd. under Section 10(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Rule 10b-5 promulgated thereunder, and against defendants Rio Tinto plc, Rio Tinto Limited, Rio Tinto International Holdings Limited, Jacques, Soirat, Quellmann, Colton, and Lane under Section 20(a) of the Exchange Act (the “Initial Complaint”).
On May 17, 2021, Defendants and Former Defendants filed motions to dismiss the Initial Complaint. On July 17, 2021, Lead Plaintiff filed its opposition to the motions to dismiss. On August 9, 2021, Lead Plaintiff sought permission to file a second amended complaint, which the Court granted on August 11, 2021.
On September 16, 2021, Lead Plaintiff filed the Second Amended Consolidated Complaint for Violations of the Federal Securities Laws (the “SAC”). On October 19, 2021, Defendants and Former Defendants filed motions to dismiss the SAC, which were fully briefed by December 17, 2021.
On September 2, 2022, the Court entered its Order granting the motions to dismiss as to defendants Quellmann, Colton, Lane, Turquoise Hill Resources Ltd. and Rio Tinto International Holdings Limited, and denying the motions to dismiss, in part, as to Defendants Rio Tinto plc and Rio Tinto Limited, Jacques and Soirat.
On October 18, 2022, Defendants filed their answer to the SAC. Among other things, Defendants’ answer denied Lead Plaintiff’s allegations of wrongdoing and asserted various defenses to the claims pled against Defendants.
Discovery in the Action commenced in November 2022. Pursuant to the discovery schedule initially set by the Court on February 2, 2023, the Parties conducted substantial document discovery, including Defendants’ production of many documents in response to Lead Plaintiff’s discovery requests as of December 2023.
On November 10, 2023, Lead Plaintiff notified the court that it intended to move for leave to file a third amended complaint based on information and documents produced in discovery. On November 13, 2023, the Court granted Lead Plaintiff’s request for a briefing schedule on the motion to file a third amended complaint. Thereafter, on December 15, 2023, Lead Plaintiff moved for leave to file a third amended complaint, and the Court granted that motion on January 8, 2024. On January 22, 2024, Defendants moved the Court to reconsider that order and, on February 21, 2024, the Court granted in part and denied in part Defendants’ motion for reconsideration and directed Lead Plaintiff to re-file the third amended complaint in accordance with its rulings.
On February 28, 2024, Lead Plaintiff filed the operative Third Amended Complaint for Violations of the Federal Securities Laws (“TAC”). On March 22, 2024, Defendants filed their motion to dismiss the TAC. The motion was fully briefed on May 13, 2024. On November 7, 2024, the Court entered an order granting in part and denying in part Defendants’ motion to dismiss the TAC.
On December 20, 2024, Defendants filed their answer to the TAC. Defendants’ answer denied Lead Plaintiff’s allegations of wrongdoing and asserted various defenses to the claims pled against Defendants.
Following the Court’s order on the Complaint, the Court entered a discovery schedule on November 26, 2024. Over the course of discovery, Defendants produced many documents to Lead Plaintiff. The Parties met and conferred and exchanged numerous letters and held telephonic meet and confers concerning disputed discovery issues over several years. Lead Plaintiff also pursued discovery from Defendants through motions to compel resulting in additional discovery. The Parties also conducted discovery outside the United States, including by seeking letters of request from the Court to obtain documents and deposition testimony from witnesses located outside the U.S. The Parties took deposition testimony of non-party witnesses and obtained document productions from those witnesses.
On December 23, 2024, Lead Plaintiff filed a motion for class certification and appointment of class representative and class counsel, which was accompanied by reports from Lead Plaintiff’s expert on market efficiency and common damages methodologies and Lead Plaintiff’s expert on the domesticity of class members’ trades. On April 3, 2025, Defendants filed their opposition to Lead Plaintiff’s motion for class certification, including two expert reports of their own.
On February 5, 2025, the Parties engaged in a private mediation session before Hon. Layn Phillips (the “Mediator”). In advance of that session, the Parties exchanged and submitted detailed mediation statements and supporting exhibits to the Mediator. The Parties did not reach a resolution at that time but agreed to continue settlement discussions.
Following the first mediation session, the Parties continued to engage in discovery, in which Lead Plaintiff vigorously pursued additional document productions from Defendants, including through motions to compel discovery. In total, the Parties conducted nine depositions: the depositions of the three experts and four representatives of Lead Plaintiff in connection with the class certification motion and the depositions of non-party fact witnesses outside the U.S.
On April 25, 2025, the Parties attended a second mediation session with the Mediator. The Parties did not reach a resolution at that time but agreed to continue settlement discussions.
On May 1, 2025, the Parties reached an agreement to settle the Action. The agreement’s terms were memorialized in a term sheet executed on May 14, 2025 (the “Term Sheet”). The Term Sheet set forth, among other things, the Parties’ agreement to settle and release all claims against Defendants and Defendants’ Releasees in the Action in return for a cash payment of $138,750,000 for the benefit of the Settlement Class, subject to certain terms and conditions and the execution of a customary “long form” stipulation and agreement of settlement and related papers.
On June 17, 2025, the Parties entered into a Stipulation and Agreement of Settlement (the “Stipulation”), which sets forth the terms and conditions of the Settlement. The Stipulation can be found on the Important Documents tab of this website.
On June 26, 2025, the Court preliminarily approved the Settlement, authorized the Notice to be disseminated to potential Settlement Class Members, and scheduled the Settlement Hearing to consider whether to grant final approval to the Settlement.