Key Takeaways
- • Marshall Wace is resisting Citadel's discovery demands in a New York court filing, characterizing the document requests as excessively broad and using "highly common" search terms that burden resources without meaningful narrowing discussions.
- • The dispute centers on Daniel Shatz, a former Citadel portfolio manager who joined Marshall Wace in 2024 as global head of credit and is claiming an eight-figure deferred compensation withheld as retaliation for raising securities violation concerns.
- • Citadel alleges Shatz took confidential information before departure and breached his employment agreement; the firm seeks communications and records from Marshall Wace related to Shatz's team construction.
- • A New York judge ruled in June that Citadel could subpoena Marshall Wace records, determining much of the information sought was relevant; Citadel filed another application earlier this month claiming non-compliance and requesting clarification on which executives are in scope.
- • Marshall Wace committed to completing document production shortly and stated its intention to "fully comply" with the court order, while Citadel's legal team expects production and Marshall Wace disputes characterizations of delay tactics.
Summary
The dispute between Citadel and Marshall Wace over former portfolio manager Daniel Shatz has escalated into a contentious discovery battle in New York court. In a filing dated Tuesday (September 2026), Marshall Wace pushed back against what it characterizes as overly burdensome document demands from its rival hedge fund, arguing that Citadel is deploying search terms that are "highly common" and casting an unnecessarily wide net while refusing to engage in substantive discussions to narrow the scope of requests.
The underlying arbitration case centers on Shatz, who departed Citadel to join Marshall Wace in 2024 as the firm's global head of credit. Shatz is alleging that Citadel unlawfully withheld an eight-figure deferred compensation package in retaliation for raising concerns about potential securities violations. Citadel's counter-position holds that Shatz violated his employment agreement by removing confidential information before his exit and has aggressively pursued discovery of Marshall Wace's internal communications and related records through subpoena.
A New York judge previously ruled in June that Citadel's subpoena demands were largely justified, determining that requested materials—particularly communications between Shatz and Marshall Wace regarding the construction of the new credit team—were relevant to the arbitration. This ruling came after Marshall Wace attempted to block the subpoenas entirely, contending that Citadel was weaponizing the discovery process to harass a competitor.
The tension intensified after Citadel filed another application earlier this month alleging that Marshall Wace had failed to comply with the June court order. In that filing, Citadel sought judicial clarification that Marshall Wace executives Anthony Clake and Alan Hofmeyr should be included within subpoena scope and requested broader search parameters to identify additional relevant documents. Marshall Wace characterized these requests as "premature, unnecessary and unwarranted," asserting that further expansions would divert critical resources from ongoing compliance efforts.
Both firms have staked out conflicting positions on compliance timelines. Citadel maintains Marshall Wace has delayed evidence production for months, while Marshall Wace has disputed this characterization and committed to completing document delivery shortly with full compliance to the court's order. A Citadel spokesperson reiterated that the firm expects Marshall Wace to fulfill its discovery obligations.
The underlying arbitration case centers on Shatz, who departed Citadel to join Marshall Wace in 2024 as the firm's global head of credit. Shatz is alleging that Citadel unlawfully withheld an eight-figure deferred compensation package in retaliation for raising concerns about potential securities violations. Citadel's counter-position holds that Shatz violated his employment agreement by removing confidential information before his exit and has aggressively pursued discovery of Marshall Wace's internal communications and related records through subpoena.
A New York judge previously ruled in June that Citadel's subpoena demands were largely justified, determining that requested materials—particularly communications between Shatz and Marshall Wace regarding the construction of the new credit team—were relevant to the arbitration. This ruling came after Marshall Wace attempted to block the subpoenas entirely, contending that Citadel was weaponizing the discovery process to harass a competitor.
The tension intensified after Citadel filed another application earlier this month alleging that Marshall Wace had failed to comply with the June court order. In that filing, Citadel sought judicial clarification that Marshall Wace executives Anthony Clake and Alan Hofmeyr should be included within subpoena scope and requested broader search parameters to identify additional relevant documents. Marshall Wace characterized these requests as "premature, unnecessary and unwarranted," asserting that further expansions would divert critical resources from ongoing compliance efforts.
Both firms have staked out conflicting positions on compliance timelines. Citadel maintains Marshall Wace has delayed evidence production for months, while Marshall Wace has disputed this characterization and committed to completing document delivery shortly with full compliance to the court's order. A Citadel spokesperson reiterated that the firm expects Marshall Wace to fulfill its discovery obligations.
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