Storied Bond Trader Ken Leech Makes His Last Trade

Criminal charges threatening a storied CIO with 30 years in prison, fleeing clients, a wave of departures, and a loss of independence. That’s what befell Western Asset over the past two years. But what started out as a bombshell story has since fizzled.

Days before his trial was set to begin in mid-June, former Western Asset CIO and stalwart bond trader Ken Leech pled guilty to charges of obstructing an SEC investigation in exchange for prosecutors dropping five criminal charges levied in November 2024 alleging a cherry-picking scheme. Leech’s sentencing hearing is scheduled to begin on Sept. 21, 2026, with the possibility of six to nine months in prison now on the table.

The original allegations were much more severe than the obstruction charge to which he ultimately pled guilty. It stemmed from March 2024 statements Leech made to the SEC as part of a parallel investigation. Proceedings relating to that probe are on hold until the conclusion of Leech’s sentencing hearing.

What’s Our Verdict?

Morningstar expressed reservations regarding the charges brought against Leech in November 2024. At the time, we documented the complicated nature of the case, which centered around observed patterns of first-day unrealized gains/losses across two strategies managed at least in part by Leech between January 2021 and October 2023. We were unconvinced by the financial motivations the DOJ claimed to underpin the scheme.

A prolific trader of US Treasury futures among other fixed-income securities and derivatives, Leech was at the center of the investigation because of the alleged discretion he afforded himself by sometimes waiting until the end of the day to allocate trades among accounts. Over the period in question, Leech was accused of favoring one of his strategies at the expense of the others by using first-day market moves, after the fact, as a factor in his decision on which account to allocate a given trade.

An old-school trader, Leech’s uniquely manual process stood in contrast to modern-day industry norms, including those required of his fellow traders at Western. In hindsight, letting Leech maintain a separate trading protocol was at best an error in judgment, and at worst one that put the entire business at risk. In the absence of an electronic audit trail, a trader executing bond orders by phone or chat could delay, adjust, or selectively document trade details in ways that are difficult for compliance teams to detect or reconstruct. That cut both ways. It made arguing his innocence extremely difficult for Leech, but it also made cultivating evidence to prove Leech’s guilt a significant hurdle for the government.

That may have underpinned the prosecutors’ decision to build their case on an alleged statistical improbability of the aggregate allocation pattern, rather than pointing to any single trade or trades as evidence of fraud. The DOJ had intended to use testimony from professors of finance and statistics to argue that the consistency and magnitude of first-day gains flowing to the so-called favored portfolios were so far outside the bounds of chance that intentional cherry-picking was the only plausible explanation. That framework was outlined in pretrial filings, and Leech’s lawyers argued in response that the government had made clear it was not planning to “present evidence from any coconspirator—or any witness, document, or other evidence for that matter—establishing any of the actual details or specifics of the alleged criminal scheme.”[1]

On the whole, it seemed the government might face a considerable challenge in convincing a jury to convict Leech on the basis of aggregate statistics rather than direct, tangible evidence. Prosecutors may have eventually come to that conclusion, too, given their willingness to switch direction this late. As part of an agreement to drop all charges related to his trading, Leech admitted that he gave false and misleading testimony during the SEC’s parallel investigation when asserting he knew where he planned to allocate trades at the time he placed them. Leech may still face jail time, but neither his plea agreement nor Western’s SEC settlement includes admissions of guilt to the original trading charges.

A Complex Legacy

Leech officially retired from the industry in August 2025, roughly one year after being served a Wells Notice from the SEC and beginning an indefinite leave of absence from Western.

His aggressive macroeconomic positioning was a primary driver of the firm’s post-global financial crisis rise, a period when credit and interest rate risk reinforced each other more often than not. Patient investors in the firm’s flagship strategies, Western Asset Core Bond WATFX and Western Asset Core-Plus Bond WACPX, benefited tremendously from this phenomenon.

Of course, the high-octane approach required long-term fundholders to stomach steep drawdowns, and there were several. Both funds sold off sharply in the depths of the global financial crisis and during the telecom selloff of the early 2000s before that, though Leech and company managed to engineer sharp recoveries in each case. The story repeated itself during the pandemic-driven selloff in early 2020. But when Western was caught offside with its inflation expectations in late 2021 and into 2022—and the firm’s hallmark long-duration tilt caused its funds to woefully underperform its index and peers—that same snapback in performance didn’t materialize.

The charts below detail the timing and magnitude of each fund’s respective relative wealth advantages as well as the market conditions in which each gained that advantage. Despite the painful blips, including the failure to bounce back after underperforming from 2021 to 2022, for every dollar the Bloomberg US Aggregate Bond Index returned over Leech’s tenure on Western Asset Core Bond, the fund made USD 1.17.

The story was similar, albeit to a greater magnitude, with Western Asset Core-Plus Bond. The fund earned USD 1.24 for every dollar returned by the index over Leech’s tenure, which in this case began in 1999.

What’s Next for Western?

Western Asset had faced its own set of investigations relating to its lack of oversight to detect and prevent Leech’s alleged misconduct. Its parent company Franklin Templeton announced in August 2025 that the US Commodities Futures Trading Commission closed its investigation into Western with no action. The firm confirmed that it received a declination of prosecution from the DOJ and reached a USD 100 million settlement with the SEC in early June 2026.

Western and Franklin have shed those burdens, but the saga has shaken both firms since it spilled into the public eye nearly three years ago. Reporting lines, for example, have shifted. After tapping Thomas Gahan to step in as Western’s CEO in December 2024 (replacing James Hirschmann III, who, alongside Leech, helped elevate Western among the leading fixed-income managers in the world), Franklin has elected to move forward without a Western CEO, effective June 30, 2026.

At that time, Gahan will step down as CEO and return to his post as chair of Benefit Street Partners, Franklin’s alternative credit manager. Western CIO Michael Buchanan will report directly to Franklin Templeton Fixed Income global CIO Sonal Desai. Though it’s a departure from an arm’s-length structure that has existed between Franklin and Western since 2020, the handoff won’t immediately lead to changes to Western’s investment personnel or philosophy.

The economics of Western’s business have shifted, too. A combination of uncharacteristic underperformance, market headwinds, and the regulatory cloud over Leech has led many investors to head for the exits. After peaking at USD 92.9 billion in September 2021, the firm’s mutual fund assets under management shrank by more than 6 times to USD 14.8 billion by May 2026.

Firm-level AUM took a hit as well, albeit not to the same degree in relative terms. Western’s USD 222.2 billion year-end 2025 asset base was less than half its USD 483.5 billion September 2021 level.

Such a drastic dip in AUM can have a material impact on business decisions, as well as employees worried about their careers. For example, more than a dozen investment professionals have left the firm since the second half of 2024, including four managers who accepted voluntary buyout packages, as Morningstar previously documented.

Even though Western’s investment approach remains differentiated, there’s no denying that the outflows have put pressure on the firm’s ability to retain talent.

[1] Morvillo Abramowitz Grand Iason & Anello, P.C., and Cleary Gottlieb Steen & Hamilton LLP. 2025. “Memorandum of Law in Support of Defendant S. Kenneth Leech II’s Omnibus Motions In Limine," P. 6. United States v. S. Kenneth Leech II, No. 24 Cr. 658 (GHW) (S.D.N.Y. Dec. 15, 2025) (Document 58).