Fed-Aware Fixed-Income Barbell
Pair unsupported credit yield with policy-backed mortgage protection
- Difficulty
- Advanced
- Time to result
- ~ongoing to results
- Steps
- 5
- Confidence
- 96%
The framework divides a fixed-income allocation between assets offering attractive credit carry and assets positioned to protect the portfolio during economic stress. On the return side, investors examine double-B corporate bonds and bank loans that may be underowned because institutional mandates restrict purchases. On the defensive side, they hold agency mortgages, whose government backing and eligibility for Federal Reserve purchases can support prices when growth weakens and credit spreads widen. The mechanism is not simply to combine risky and safe bonds: it deliberately pairs securities outside the Fed’s normal buying perimeter with securities the Fed can readily support. Investors must still evaluate issuer leverage, loan quality, mortgage prepayment behavior, duration, and changing valuations before sizing either side.
Origin
Extracted from Masters in Business, where Mike Swell described how Goldman Sachs balanced double-B credit and bank loans with agency mortgages in core bond portfolios.
Core principles
- 01Seek yield where investor restrictions create mispricing
- 02Balance credit exposure with high-quality defensive assets
- 03Distinguish risks the Fed can support from risks it cannot buy
- 04Earn spread only when the underlying risk is understood
How to run it
- 1
Define the portfolio’s defensive requirement
Determine how much of the fixed-income allocation must preserve capital or offset losses when equities and credit decline.
Pro tip Model the portfolio against both a recession and a sudden widening of credit spreads.
Watch out Do not treat every bond as defensive merely because it is labeled fixed income.
- 2
Find constrained-market credit opportunities
Look for bonds or loans offering extra spread because ratings, maturity limits, or benchmark rules exclude natural buyers.
Pro tip Compare the incremental spread with the actual difference in issuer leverage and expected loss.
Watch out A large spread may reflect genuine deterioration rather than harmless market segmentation.
- 3
Select the yield side
Build a measured allocation to attractive double-B credit, bank loans, or comparable assets with sufficient carry and acceptable default risk.
Pro tip Diversify across issuers and industries instead of relying on one high-yielding position.
Watch out Floating-rate structure does not eliminate credit or liquidity risk.
- 4
Select the defensive side
Choose high-quality agency mortgages whose spread compensates for prepayment risk and whose policy support can strengthen in a downturn.
Pro tip Favor mortgage pools where refinancing and prepayment behavior can be estimated with confidence.
Watch out Agency backing does not remove duration or prepayment uncertainty.
- 5
Monitor policy and valuation
Track Fed purchases, economic conditions, credit spreads, defaults, and prepayment trends, then rebalance when the original asymmetry disappears.
Pro tip Reduce exposure when spread compensation no longer covers the modeled risk.
Watch out Do not assume emergency central-bank programs will remain permanent.
In the wild
A bond manager finds that double-B corporate bonds and senior bank loans offer materially more carry than investment-grade credit, while agency mortgages provide government-backed exposure likely to receive Fed support if the recovery fails. The manager allocates a limited sleeve to diversified credit and balances it with carefully selected mortgage pools.
→ The portfolio gains income during recovery while retaining an asset designed to respond defensively if growth weakens.
Common mistakes
Chasing the highest spread
The framework seeks mispriced risk, not maximum yield. Investors must compare extra compensation with leverage, default, and liquidity risk.
Ignoring prepayment behavior
Agency mortgages exchange credit risk for prepayment and duration complexity. Treating them like ordinary government bonds can undermine the hedge.
Relying blindly on the Fed
Policy eligibility strengthens the defensive thesis but does not guarantee a particular purchase program or price outcome.
Is it for you?
Best for
It is best for diversified fixed-income portfolios operating in low-rate markets with strong central-bank intervention.
Not ideal for
It is not ideal for investors who cannot evaluate credit, duration, and mortgage prepayment risks.
From the transcript
“I kind of view them as a a way to barbell your portfolio.”
“were barbelling UM double B credit bank loans along with agency mortgages.”
“buying what the Fed's not buying number one, which is double bees and uh and and bank loans, and pairing that with what the FED…”
From the episode
Mike Swell on Global Fixed Income Investors (Podcast)
Mike Swell