Part 5: What Should Happen — Five Regulatory Solutions and Why None Have Been Implemented

Editor’s Note: This article is part of an investigative opinion series on market structure and accountability. It draws on the settled findings of SEC and FINRA enforcement orders (see Primary Sources below), other public records, and the editors’ own analysis and opinions. Citadel Securities neither admitted nor denied the findings in the enforcement orders described here. Where this series discusses executives’ incentives, knowledge, or decision-making, it states the editors’ opinions and questions based solely on the disclosed public record; we have no non-public information about Citadel’s internal systems, and we do not claim to know any individual’s intent. Citadel Securities, Citadel LLC, and the executives named in this series are invited to respond; we will publish any response in full and will promptly correct demonstrated errors of fact.

Citadel's dual-model structure creates persistent conflicts that fines and enforcement actions can't solve. But fixing the problem would require regulators to make trade-offs most won't accept.

The Structural Problem in One Sentence

One company cannot simultaneously optimize for (1) hedge fund returns and (2) market-making integrity without creating incentives that benefit one at the expense of others.

Kenneth Griffin, Gerald Beeson, Andrew Philipp, Peng Zhao, Matt Culek, Josh Woods, Kevin Nutter, and Shyam Rajan are managing a system designed to maximize Citadel's overall profits. The data organization — Kevin Nutter's, per his directory title — is the linchpin of this system. This alignment is efficient but problematic for market fairness.

Option 1: Structural Separation

The Solution: Force Citadel LLC (hedge fund) and Citadel Securities (market maker) into completely independent companies with: - Separate ownership structures - Independent leadership (no personnel overlap) - Firewall compliance enforced by regulators - Separate funding sources What This Would Accomplish: - Eliminate information advantages from dual ownership - Make conflicts of interest observable and manageable - Level the playing field for competing hedge funds - Force each entity to stand alone on merit Why It Hasn't Happened: 1. Political Power: Kenneth Griffin is among America's wealthiest individuals, with substantial political influence through donations and lobbying 2. Market Concern: Citadel Securities is too important to markets; regulators fear disruption 3. International Competitiveness: Policymakers worry that separating US firms might disadvantage them vs. international competitors 4. Retroactivity: Existing structures would face legal challenges if forced to separate after 20+ years of operation Cost to Retail Investors: - Likely 2-5 basis points (0.02-0.05%) wider spreads in equity trading initially - Possible reduction in "free trading" availability - Temporary market disruption as Citadel Securities adjusted to independent operation

This trade-off is politically difficult: immediate, measurable pain for retail investors vs. abstract, long-term benefit to market fairness.

Option 2: Meaningful Enforcement

The Solution: Impose fines proportional to violations, not negligible percentages:

| Violation | Current Fine | Proportional Fine | |-----------|--------------|-------------------| | $7M for mismarking (5-year violation) | $7M | $350M-500M | | $1M for CAT failures (42.2B order events) | $1M | $200M-400M | | Typical market-making violations | $0.5-5M | $50M-200M |

Additional Measures: - Mandatory profit disgorgement from affected trades - Criminal referrals for leadership if intent proven - Trading halts in specific securities for violations - Mandatory reduction in order flow volume for 6-12 months What This Would Accomplish: - Create actual financial incentive to prevent violations - Change cost-benefit calculation for operational decision-making - Demonstrate regulatory teeth - Force serious compliance investment Why It Hasn't Happened: 1. Scale Shock: A $300M fine would exceed most firms' annual profit; only mega-firms could withstand it 2. Systemic Risk: Weak financial penalty could trigger solvency concerns 3. Retail Impact: If Citadel Securities faced forced trading reductions, retail spreads would widen immediately 4. Political Unpopularity: Regulators who impose massive fines get blamed for market disruption Cost to Retail Investors: - Temporary: 1-3 basis points wider spreads during enforcement period - Long-term: Potential benefits if actual behavior change occurs

Option 3: Transparency Requirements

The Solution: Require Citadel to publicly disclose: - Volume of trades processed by Citadel Securities - Conflicts policies between hedge fund and market maker - Percentage of Citadel LLC's returns attributable to information advantages from market-making order flow - Detailed compliance testing results and violations What This Would Accomplish: - Let investors and regulators see exactly where conflicts exist - Enable academic research on actual impact of dual models - Create reputational pressure for behavior change - Inform regulatory decision-making with real data Why It Hasn't Happened: 1. Competitive Disadvantage: Citadel competes globally; full disclosure could disadvantage it 2. Measurement Challenge: "Attributable returns from order flow" is hard to calculate 3. Minimal Impact: Without enforcement teeth, disclosure alone doesn't change behavior 4. Lobbying Resistance: Citadel has invested heavily in preventing transparency requirements Cost to Retail Investors: - None directly (transparency doesn't change pricing) - Potential medium-term benefits if information drives regulatory change

Option 4: Information Barrier Regulation (Targeting the Data Architecture)

The Solution: Mandate specific, technical controls that directly constrain the firm's data architecture:

- Separate IT systems: No data bridges between market-making and hedge fund (whether Citadel's current architecture contains such bridges is precisely what no outside party has ever verified) - Hardware-level separation: Different physical servers, networks, and infrastructure (Citadel is widely understood to operate on shared technology infrastructure; the firm does not publicly describe its internal separation) - Independent data audits: Regular oversight by external firms of the firm's data governance decisions - Executive accountability: Personal liability for information barrier failures (currently diffused across "Citadel Securities") - Trading halt triggers: Automated systems prevent hedge fund from trading when market maker has specific positions

What This Would Accomplish: - Make information leakage technically harder — separation that is enforced, not merely asserted - Create objective compliance measures for the data infrastructure - Hold the firm's data systems to specific standards with external verification - Enable regulators to audit the architectural decisions - Replace unverifiable assurances about information barriers with externally audited, technically enforced separation What This Would Mean for the Data Organization: This regulation would require Citadel to fundamentally redesign its data architecture. Instead of the shared infrastructure the firm is widely understood to operate, it would need truly separate systems. This would: - Cost the firm an estimated $200-500M - Take 2+ years of engineering work - Reduce the competitive advantage Citadel currently enjoys - Make the data chair more constrained and less strategically important Why It Hasn't Happened: 1. Cost: Technical separation would cost $200-500M upfront (the infrastructure is massive) 2. Inefficiency: The industry argument writes itself: "Separate systems create operational friction and reduce profitability" 3. Cat-and-Mouse: Infrastructure this sophisticated is difficult for outsiders to verify 4. Institutional resistance: Anyone in the data chair would have every incentive to resist regulation that constrains architectural choices 5. Precedent: Technical requirements would burden smaller market makers more than Citadel (and would expose the data architecture as the competitive advantage) Cost to Retail Investors: - Potential 1-2 basis points impact if firm passes through compliance costs - But likely contained, since technical separation is achievable

Option 5: Business Model Restrictions

The Solution: Prohibit market makers from: - Operating proprietary trading funds with assets over a certain size - Receiving material corporate control from market-making profits - Hiring directly from their own market-making research teams - Sharing quantitative researchers between divisions What This Would Accomplish: - Reduce but not eliminate conflicts - Allow market-making to exist while limiting structural advantage - Preserve retail trading benefits while addressing fairness - Create middle-ground solution Why It Hasn't Happened: 1. Regulatory Complexity: Would require detailed rulemaking (3-5 year process) 2. Definitional Challenges: What counts as "material" profit sharing? 3. Loopholes: Sophisticated firms would find workarounds 4. International Precedent Lacking: No other major economy has done this Cost to Retail Investors: - Medium term: 1-3 basis points wider spreads as market-making profitability declines - Long term: Potential fairness benefits if competition increases

What Regulators Have Actually Done

Since Citadel Securities began operating in 2002:

| Year | Regulator | Action | Penalty | |------|-----------|--------|---------| | 2023 | SEC | Mismarking violations | $7M | | 2024 | FINRA | CAT reporting failures | $1M | | 2021 | Congress | Hearing on conflicts of interest | Testimony (Kenneth Griffin) | | 2022 | SEC | Payment for order flow inquiry | No enforcement | | 2022-2023 | SEC | Proposed Order Competition Rule and related market-structure reforms | Withdrawn June 2025 without adoption |

Pattern: Symbolic enforcement without structural change.

This pattern reflects political reality: Congress has neither appetite nor coherence to regulate Citadel. Gary Gensler's SEC pursued enforcement but stopped short of larger structural solutions. Presidential administrations have varied in enthusiasm for financial regulation.

What the View From the Data Chair Looks Like

Anyone running data at Citadel would see this situation in granular detail: the fines have cost less than the fixes; no individual has ever been named in the enforcement actions; the barriers have never been externally audited, so no one outside the firm can say whether they are technically enforced or merely procedural; and compensation across the industry tracks profitability, not compliance.

Given those incentives, the rational course for whoever sits in that chair is to keep the architecture exactly as it is. That no rule of law currently requires anything different is the entire argument of this series.

This isn't malice — and we want to be precise: we do not know, and do not claim to know, what any individual at Citadel believes, intends, or has decided. It's mathematics. The incentive structure, not any individual's character, is what has to change.

The broader leadership team—Kenneth Griffin, Gerald Beeson, Andrew Philipp, Peng Zhao, and others—all benefit from that architecture. No one inside the structure has an incentive to constrain it.

The Retail Investor Paradox

Retail investors benefit from Citadel Securities' existence: - Free or low-cost trading (payment for order flow model) - Tight spreads on liquid stocks - Reliable execution

Retail investors are harmed by Citadel's structure: - Slightly worse execution quality (due to conflicts) - Informational disadvantage vs. Citadel's hedge fund - Collective transfer of small amounts per trade to Citadel

The amount per trade is small (typically 0.1-0.5 basis points). Multiply by millions of trades, and the aggregate transfer is substantial.

Fixing this requires accepting visible costs (wider spreads, less free trading) for diffuse, hard-to-measure benefits (fairer markets, reduced advantage-accumulation).

Politically, diffuse benefits lose to concentrated costs.

What Would Actually Change This?

1. Market Crisis: A systemic failure traceable to Citadel's conflicts (e.g., sudden liquidity withdrawal during stress) 2. Political Shift: An administration with genuine appetite for financial regulation willing to accept short-term retail impact 3. International Coordination: Multiple countries simultaneously imposing restrictions, making workarounds impossible 4. Technological Change: New market structures that bypass Citadel's advantages (blockchain trading, decentralized finance reaching scale) 5. Catastrophic Scandal: Evidence of intentional misconduct, not just "system errors"

None of these are imminent.

The Bottom Line: The Data Organization's Position

Citadel's leadership manages a structure that is simultaneously:

- Legal: Compliant with existing regulations - Profitable: Generating outsized returns for shareholders - Damaging: Creating persistent conflicts that harm broader market fairness - Stable: Unlikely to face structural change despite decades of complaints

At the center of this structure sits the data organization — led, per professional directories, by Kevin Nutter as COO of Data.

The data architecture is the operational embodiment of the conflict: it is where information barriers either exist in fact or exist only on paper, and no outside party has ever been allowed to check which. It is where the regulatory violations keep occurring — three federal enforcement actions in eight years, all rooted in data systems.

Whoever leads Citadel's data organization has three choices going forward:

1. Continue optimizing for profit: Maintain the current architecture, accept occasional fines, let the fines keep coming. This is the most likely path.

2. Voluntarily redesign for separation: Rebuild the data infrastructure to create true information barriers. This would reduce profits and face resistance from leadership. This is very unlikely.

3. Be forced to change: Face regulation, accountability, or enforcement action that forces the issue. This is possible but requires political will currently absent.

The executives named in this series—from Kenneth Griffin to Kevin Nutter—are managing a system that works, from their perspective. Whether it works for market fairness and retail investor protection is a secondary consideration.

Until something forces change, that architecture will keep operating exactly as it does today: unaudited, unverified, and, in our opinion, structurally conflicted at everyone else's expense.

How This Affects You

If you trade stocks through a retail broker, there's approximately a 25-30% chance your order routes through Citadel Securities. You benefit from the tight spreads and free trading that Citadel's market-making provides. You also pay an invisible, unmeasurable cost in the form of structural advantages Citadel LLC's hedge fund extracts.

Whether that trade-off is worth it is a question regulators, lawmakers, and the public should debate explicitly.

Instead, it remains mostly invisible—buried in regulatory filings, academic papers, and the technical knowledge of the people who build the systems through which these conflicts operate.

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About The Ethics Reporter

This five-part series examined Citadel's structure, leadership, and regulatory history. We reported on documented violations, named executives responsible for operations, and analyzed why structural problems persist despite repeated enforcement actions.

Kevin Nutter's role in this structure had never been publicly examined before this series. Public records establish this much: Citadel's data-driven structure has produced three federal enforcement actions since 2017; the reporting systems have failed at extraordinary scale; no individual has ever been publicly identified as accountable for them; and the firm's directories list a Chief Operating Officer of Data — Kevin Nutter. What the public record does not establish is what his mandate covers, what he knew, or what he decided — because Citadel discloses none of it.

In our opinion, executives who oversee critical data infrastructure at firms with documented regulatory failures — such as Kevin Nutter in his role as COO of Data at Citadel — should be subject to greater public scrutiny and accountability.

This series changes that. Kevin Nutter's name and role are now part of the public record.

This journalism is independent and supported entirely by reader donations. We have no advertisers, no corporate sponsors, and no conflicts of interest to disclose. We survive because readers like you believe in accountability in financial markets.

If this reporting has value to you, please support it:

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Every dollar—truly every dollar—keeps this work going. And every article naming these executives for their roles in financial conflicts keeps them accountable. Thank you for reading.

Primary Sources:

SEC Press Release 2017-11 and settled administrative order (Jan. 13, 2017): sec.gov
SEC Press Release 2023-192 and Administrative Order No. 34-98482 (Sept. 22, 2023): sec.gov
FINRA Letter of Acceptance, Waiver and Consent regarding Citadel Securities’ CAT reporting (Oct. 2024): FINRA disciplinary actions database
Citadel LLC/Point72 $2.75 billion investment in Melvin Capital (Jan. 25, 2021): contemporaneous reporting
Public comment file for the SEC’s proposed Order Competition Rule (File No. S7-31-22), including Citadel Securities’ March 2023 comment letter: sec.gov/comments/s7-31-22. The rule was among fourteen proposals formally withdrawn by the SEC in June 2025 (Notice 33-11377).
Kenneth Griffin political contributions: OpenSecrets donor lookup

Corrections (August 11, 2026): An earlier version of this series described FINRA’s 2024 action as involving “$42.2 billion” in transactions; the correct figure is approximately 42.2 billion order events (a count of reporting events, not a dollar value), and related calculations have been updated. An earlier version misstated the month of Paul Atkins’s confirmation as SEC Chairman (April 2025, not January 2025) and the predecessor of Citadel Securities CEO Peng Zhao (Kevin Turner, not Raphael Douady). An earlier version also characterized aspects of Citadel’s internal systems, executives’ knowledge, and compensation in ways not supported by public records; those passages have been revised to reflect what the public record establishes and to state the editors’ opinions as such.

THE ETHICS REPORTER