INDICATOR EXPLAINER · #04
Junk Bond Demand — what the bond market is telling us
Stock prices move for a lot of reasons. Bond markets are quieter, slower, and driven by different people. When the two disagree, the bond market has historically been right more often than not.
Today's reading
Same number you'll see on this component's card on the main dashboard.
What is Junk Bond Demand?
Corporate bonds come in two flavors. Investment-grade bonds (rated BBB or higher) are lent to safer companies with strong balance sheets. High-yield bonds — nicknamed "junk" bonds — are lent to riskier companies and pay higher interest to compensate.
When investors feel optimistic, they chase yield: they buy junk bonds and their prices rise. When they feel scared, they run to safety: they buy investment-grade bonds and dump junk. This is called credit-market risk appetite, and it's one of the most respected sentiment gauges among professional investors.
BATS measures it with a simple, ETF-based proxy:
The HYG vs LQD spread
- HYG iShares iBoxx High Yield Corporate Bond ETF — the "junk" side.
- LQD iShares iBoxx Investment Grade Corporate Bond ETF — the "safe" side.
- Spread
20-day return of HYGminus20-day return of LQD. Positive = risk-on. Negative = flight to safety.
How BATS uses it
Junk Bond Demand is confirmatory, not contrarian. Risk-on credit markets confirm bullish equity markets; flight-to-safety credit markets warn of equity weakness. Same scoring shape as Market Breadth: linear, centered on zero.
BATS points = 50 + (spread × 10), clamped to 5–95.
| Spread range | BATS points | Bucket |
|---|---|---|
| Above +4.5% | 95 | Extended |
| +2.5% to +4.5% | 75 – 95 | Bullish |
| +0.8% to +2.5% | 58 – 75 | Slightly Bullish |
| −0.8% to +0.8% | 42 – 58 | Neutral |
| −2.5% to −0.8% | 25 – 42 | Slightly Bearish |
| −4.5% to −2.5% | 5 – 25 | Oversold |
| Below −4.5% | 5 | Extremely Oversold |
Does it work? — Historical backtest (2007–2026)
For every trading day since HYG's 2007 inception, we compute the Junk Bond Demand component of the BATS and measure how the S&P 500 actually performed 6 and 12 months later.
What the data actually says
Three findings from the 18-year backtest — and a key reason it's part of the blend:
Credit stress = buying opportunity.
When the HYG–LQD spread pushed below −4.5% (credit markets fleeing to safety), the S&P 500 was up an average of +18.3% over the next 12 months, and positive 87% of the time (n=259). The 2008 crisis and 2020 COVID crash are both in this bucket.
Takeaway: When bond markets panic, historically it's been a buying opportunity for stocks. Just don't try to catch the exact bottom.
Risk-on credit = bullish confirmation.
When the spread pushed above +4.5% (extreme risk appetite), forward 12-month returns averaged +14.8%, 84% positive (n=131). Not as dramatic as the oversold bucket, but a genuine "trust the trend" signal.
Takeaway: When bond markets are chasing yield, stocks usually keep climbing.
Uncorrelated with the others.
Junk Bond Demand fires at different moments than VIX, Breadth, or RSI — because bond markets and equity markets are driven by different investors. When we blended it in at 10% weight, the 4-way BATS pushed its Very Oversold bucket from 96% hit rate to 100%.
Takeaway: The signal earns its keep even at modest weight. Diverse signals filter each other's noise.
How to use this information
- Watch the extremes. The middle of the range (spread near zero) is noise. When the spread pushes past ±3–4%, the bond market is saying something worth listening to.
- Bond markets lead, not follow. Because bond markets are dominated by professional investors trading trillions of dollars, they tend to reflect economic reality faster than emotional equity flows. A credit-market panic often precedes an equity bottom by weeks.
- Not a timing tool. "Credit stress = buy signal" doesn't mean today. It means the odds over the next 6–12 months are unusually good. Bottoms take time to form.
- Pair with the other three. Junk Bond Demand covers a different market than VIX (options), Breadth (equity participation), or RSI (equity momentum). When multiple components agree, confidence goes way up.
Reminder: None of this is investment advice. Historical patterns are not guarantees. Always do your own research or talk to a financial professional.