What Happens to S&P 500 ETF (SPY) When Investment Grade Spreads Compress Below 100 bps?
IG corporate spreads below 100 bps signal credit-market complacency. What happens when investors accept minimal premium over Treasuries for corporate credit?
How S&P 500 ETF (SPY) Responds
Scenario Background
Investment-grade corporate spreads measure the extra yield investors demand for corporate bonds over Treasuries. IG spreads average around 130-150 bps over long cycles. Spreads below 100 bps signal credit-market complacency: investors are accepting historically tight premiums for taking corporate credit risk.
Read full scenario analysis →Historical Context
IG spreads below 100 bps are rare. Post-2000, such episodes include 2005-2007 (pre-GFC, bottom 84 bps in February 2007), 2018 (94 bps in February), and 2024-2025 (multiple sub-90 bps prints in H2 2024 through early 2025). The 2007 episode was followed by spreads exploding to 618 bps by December 2008. The 2018 tightness preceded modest widening to 190 bps during the December 2018 risk-off. Historically, sub-100 bps IG spreads have been associated with strong equity rallies that ultimately peaked ...
What to Watch For
- •IG spreads widening 20+ bps in a month (trend change signal)
- •HY-IG spread ratio exceeding 5.0 (HY stress leading IG)
- •Default rates rising (Moody's tracking, rating downgrades)
- •Corporate earnings revisions turning negative
- •Fed balance-sheet reduction accelerating
Other Assets When Investment Grade Spreads Compress Below 100 bps
Other Scenarios Affecting S&P 500 ETF (SPY)
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