A successful systematic credit strategy is not just about predicting returns. It equally relies on accurately forecasting the associated risks and, crucially, the transaction costs, described as avoiding giving a 'liver and a kidney to Goldman Sachs.'

Howard Marks attributes Oaktree's success to one core competency: predicting a company's probability of default better than the market. This micro-level, bottom-up analysis is the necessary condition for superior performance, allowing them to earn excess returns by identifying mispriced risk.

An extensive study of 4 million scenarios by Acadian shows that market timing strategies for credit—exiting when spreads are tight and re-entering when wide—underperform a simple buy-and-hold approach approximately 70% of the time. The roll-down return from the yield curve is consistently underestimated.

Unlike discretionary managers with narrow focus, a systematic process has a view on every bond continuously. This allows it to act as a liquidity provider—trading opportunistically when others are forced to transact—and capture implementation alpha, effectively being 'paid to trade.'

Goodwin argues against the passive "index-hugging" approach to credit focused on coupon payments and agency ratings. Diameter's edge comes from approaching credit like an equity long-short fund, constantly analyzing what macro and sector trends will change security prices over the next 3 to 24 months to generate total return.

Judging the credit market by its overall index spread is misleading. The significant gap between the tightest and widest spreads (high dispersion) reveals that the market is rewarding quality and punishing uncertainty. This makes individual credit selection far more important than a top-down market view.

Corporate bond transaction costs represent a high proportion of total asset volatility compared to equities or macro strategies. To prevent trading friction from eroding excess returns, systematic credit models continuously assess transaction costs, limiting turnover to one to one-and-a-half times annually.

Market drawdowns initially create indiscriminate selling where fundamentally sound and weak issuers trade down together. Systematic strategies generate their highest alpha during the subsequent rationalization period, when dispersion resolves and markets differentiate strong credits from distressed issuers.

In a market where spreads are tight and technicals prevent sustained sell-offs, making large directional bets is a poor strategy. The best approach is to stay close to benchmarks in terms of overall risk and allocate the risk budget to identifying specific winners and losers through deep, fundamental credit analysis.