By Adrianne Appel
In a significant enforcement action highlighting the persistent regulatory focus on fiduciary breaches within the asset management industry, Stephen Kenneth Leech II, the former co-chief investment officer at Western Asset Management Company (Wamco), has agreed to pay $3 million to resolve allegations that he engaged in a multi-year “cherry-picking” scheme. The Securities and Exchange Commission (SEC) announced the settlement on October 6, concluding a probe into conduct that allegedly saw hundreds of millions of dollars in investment opportunities manipulated for the benefit of select portfolios.
According to the complaint filed by the SEC in the U.S. District Court for the Southern District of New York on November 25, 2024, Leech abused his position of trust to steer high-performing assets into preferred accounts while sidelining others. The case serves as a stark reminder of the complexities involved in overseeing discretionary trading at major financial institutions and the regulatory consequences when those controls fail.
The Core Allegations: A Breach of Fiduciary Duty
At the heart of the SEC’s case is the practice known as “cherry-picking.” In the world of investment management, this involves the illicit allocation of trades in a manner that favors certain accounts over others. Typically, an investment manager executes a block trade and then allocates the securities to various client accounts. Cherry-picking occurs when the manager waits to see how a security performs during the day before deciding which accounts receive the “winning” trades and which receive the “losing” ones.
The SEC alleges that between January 2021 and October 2023, Leech—who managed billions of dollars in client assets—orchestrated this strategy to benefit a specific subset of portfolios. By directing more than $600 million toward his “favorites basket,” Leech effectively disadvantaged the remaining client base. This conduct constitutes a fundamental violation of the Investment Advisers Act of 1940, which mandates that investment advisers act in the best interest of their clients and provide full disclosure regarding potential conflicts of interest.
The SEC’s complaint outlines that Leech’s actions were not merely clerical errors but intentional maneuvers designed to bolster the performance of favored accounts at the expense of others. For institutional investors, who rely on the integrity of their portfolio managers to execute trades fairly and transparently, such actions undermine the very foundation of the advisory relationship.
Chronology of the Misconduct and Investigation
The timeline of Leech’s activities and the subsequent regulatory response provides a window into how such schemes are often uncovered and processed by federal authorities.
2021: The Commencement of the Scheme
In January 2021, Leech began the practice of favoring specific portfolios under his management. During this period, market volatility and the high volume of trades handled by a firm of Wamco’s stature provided a shroud for the discriminatory allocation of assets.
2022: Expanding the Scope
Throughout 2022, the volume of assets being funneled into the favored portfolios grew significantly. As Leech continued to manage substantial portions of client capital, the discrepancy between the performance of his “favorites” and the other portfolios began to widen, eventually triggering internal monitoring systems or regulatory red flags that would lead to the formal SEC investigation.
2023: Termination and Investigation
By October 2023, the scope of the alleged misconduct had reached the attention of investigators. Following the cessation of his activities, the SEC launched a comprehensive review of trade execution records, communication logs, and internal firm policies.
2024: Formal Charges and Settlement
On November 25, 2024, the SEC filed its formal complaint in the Southern District of New York. The subsequent settlement, announced on October 6, 2025 (as part of the final resolution process), requires Leech to pay $3 million in penalties and disgorgement. This resolution brings a formal end to the litigation while signaling the SEC’s commitment to penalizing individual bad actors in high-level investment roles.
Supporting Data and Technical Mechanics
The mechanics of the $600 million scheme were sophisticated, leveraging the sheer scale of Western Asset Management’s operations. By manipulating the allocation of fixed-income and other high-value assets, Leech was able to disproportionately assign profitable positions to accounts that may have had higher fee structures, carried personal or professional incentives, or were simply subject to less stringent oversight.
How “Cherry-Picking” Works
In a standard, compliant environment, trade allocations are determined prior to the execution of the trade. This ensures that every client receives an equitable share of the performance. Leech, however, reportedly delayed the allocation process. By holding off on the “ticket” assignment until the price movement of the securities was known, he ensured that the favored portfolios benefited from the “best” trades.
- Total Affected Capital: Over $600 million.
- Time Horizon: 34 months (January 2021–October 2023).
- Settlement Amount: $3 million in total penalties.
The SEC’s forensic accountants analyzed millions of trade tickets to reconstruct the allocation patterns. The data showed a statistically significant divergence that could not be attributed to standard investment strategies or client-specific mandates. The “favorites basket” consistently outperformed the general client pool by margins that were inconsistent with random market variance.
Official Responses and Regulatory Stance
The SEC’s position remains firm: the size of a firm or the status of a portfolio manager does not exempt individuals from strict adherence to fiduciary standards.
In the wake of the settlement, the SEC reiterated that “cherry-picking” is a priority enforcement area. The agency has increasingly utilized data analytics to detect patterns of misconduct that were previously difficult to identify. By flagging abnormal allocation patterns, the SEC is making it harder for portfolio managers to hide behind the complexity of large-scale trade operations.
Western Asset Management Company, for its part, has cooperated with the investigation. While the firm has not been the primary target of the SEC’s recent litigation against Leech, the case has prompted a broader industry review of trade allocation software and compliance protocols. Firms are now being urged to implement “pre-allocation” requirements that are locked into the system, preventing any post-trade manual adjustments without extensive oversight and documentation.
Implications for the Asset Management Industry
The case of Stephen Kenneth Leech II holds profound implications for the asset management industry, particularly regarding compliance and institutional culture.
1. Strengthening Compliance Infrastructure
The most immediate takeaway for firms is the necessity of automated, immutable trade allocation systems. The era of manual overrides or delayed allocation is effectively over. Compliance departments are now under pressure to implement “hard-coded” allocation rules that trigger alerts the moment a manual intervention is detected.
2. The Shift Toward Individual Accountability
The SEC has been clear in its recent strategy: it is not enough to fine the firm; the individuals responsible for the misconduct must also face personal financial and professional consequences. By requiring a $3 million settlement from Leech, the SEC is sending a deterrent message to other CIOs and portfolio managers. The personal financial cost, combined with the permanent reputational damage, serves as a powerful motivator for ethical conduct.
3. Investor Trust and Transparency
For institutional clients, this case underscores the importance of rigorous due diligence. Clients are increasingly asking for audits of their managers’ trade allocation reports. There is a growing demand for transparency regarding how block trades are partitioned among different client accounts. Firms that fail to provide this level of transparency may find it increasingly difficult to attract or retain major institutional capital.
4. The Future of Oversight
As the industry moves toward faster, more automated trading environments, the SEC’s reliance on forensic data will only grow. We can expect to see an increase in “sweeps” targeting firms that exhibit similar patterns of trade allocation discrepancies. The technology used to commit fraud is being countered by even more advanced technology used to detect it.
Conclusion
The settlement involving Stephen Kenneth Leech II marks a significant milestone in the ongoing efforts by regulators to sanitize the financial services sector. By systematically favoring specific portfolios, Leech violated the trust of his clients and the regulations governing the industry. The $3 million settlement is a significant penalty, but the broader cost—the erosion of professional integrity—is far greater.
As the financial landscape continues to evolve, the case of Western Asset Management’s former CIO will be cited as a cautionary tale. It serves as a reminder that in an industry built on the management of other people’s money, the most valuable asset any manager possesses is their reputation for fairness and the legal mandate to act in the best interest of their clients. For the SEC, the case is a successful demonstration of its ability to investigate complex, multi-year schemes and hold those in the highest positions of power accountable for their actions.
Moving forward, the industry must prioritize the implementation of robust, tamper-proof systems to ensure that every investor, regardless of the size of their portfolio, receives equitable treatment. The era of the "favorites basket" is being systematically dismantled by regulatory vigilance and technological oversight.
