High Yield (HYG) vs Short Treasury (SHY)
HYG (iShares iBoxx $ High Yield Corporate Bond ETF, duration 3.5 years, AUM ~$15 billion) shows a 30-day SEC yield of approximately 7.5 percent in April 2026. SHY (iShares 1-3 Year Treasury, duration 1.9 years) shows a SEC yield of approximately 3.81 percent.
Also known as: High Yield Credit (HYG) (ETF_HYG, junk bond ETF) · 1-3Y Treasury (SHY) (ETF_SHY)
Why This Comparison Matters
HYG (iShares iBoxx $ High Yield Corporate Bond ETF, duration 3.5 years, AUM ~$15 billion) shows a 30-day SEC yield of approximately 7.5 percent in April 2026. SHY (iShares 1-3 Year Treasury, duration 1.9 years) shows a SEC yield of approximately 3.81 percent. The HYG-SHY yield differential of approximately 370 basis points reflects the high-yield credit risk premium plus a modest duration component. HY OAS (Bloomberg High Yield US OAS) sits at 280 basis points, near 25-year tights versus the long-run 550 basis point average. HYG/SHY ratio is approximately 1.05.
What HYG and SHY Capture
HYG (iShares iBoxx $ High Yield Corporate Bond ETF) holds U.S. high-yield corporate bonds rated below investment grade (BB and below). April 2026: 30-day SEC yield approximately 7.5 percent, modified duration approximately 3.5 years, AUM approximately $15 billion, expense ratio 0.49 percent. The portfolio holds approximately 1,200 bonds across 950-plus issuers.
SHY (iShares 1-3 Year Treasury Bond ETF) holds nominal Treasury bonds maturing in 1 to 3 years. April 2026: 30-day SEC yield approximately 3.81 percent, duration 1.9 years, AUM approximately $25 billion. The HYG/SHY pair compares high-yield credit risk against the cleanest cash-equivalent benchmark, with the yield differential of approximately 370 basis points providing a direct read on the high-yield credit spread component.
Why HYG/SHY Strips Duration to Isolate Credit Risk
HYG/SHY is significantly cleaner than HYG/TLT for isolating credit risk. HYG duration 3.5 years vs SHY 1.9 years (1.6-year duration mismatch). A 100 basis point yield rise produces 3.5 percent HYG decline and 1.9 percent SHY decline (1.6 percent NAV difference per 100bp). This is small relative to typical credit spread moves of 200 to 1,500 basis points (which produce 7 to 50 percent HYG price moves).
By contrast, HYG/TLT (TLT duration 17 years) has 13.5-year duration mismatch, producing 13.5 percent NAV difference per 100bp parallel shift. The duration noise dominates the credit signal in HYG/TLT but not in HYG/SHY. HYG/SHY is therefore the cleanest credit-risk gauge in liquid ETFs, suitable for direct credit-spread views without taking the absolute-rate risk that pure duration trades carry.
The HY OAS Connection
The HY OAS (Bloomberg High Yield US OAS, ICE BofA H0A0) measures option-adjusted spread of U.S. high-yield bonds over the Treasury curve. April 2026: HY OAS 280 basis points, near 25-year tights. Long-run average: 550 basis points. The lowest reading sub-300bp was last seen 2007 pre-GFC, suggesting late-cycle territory.
The HYG-SHY yield differential approximately tracks HY OAS plus duration premium. HYG SEC yield 7.5 percent minus SHY 3.81 percent equals 369 basis points. The differential exceeds reported HY OAS (280bp) by approximately 90 basis points, reflecting the longer effective duration of HYG (3.5 years vs implied zero of OAS calculation). HYG/SHY ratio at 1.05 is near multi-year highs, consistent with HY OAS at multi-year tights.
Conditional Forward Response (Tail Events)
How 1-3Y Treasury (SHY) has historically behaved in the 5 sessions following a top-decile or bottom-decile daily move in High Yield Credit (HYG). Computed from 1,285 aligned daily observations ending .
Following these triggers, 1-3Y Treasury (SHY) falls 0.05% on average over the next 5 sessions, versus an unconditional baseline of -0.02%. 129 qualifying events; 1-3Y Treasury (SHY) closed positive in 41% of them.
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Frequently Asked Questions
What does HYG vs SHY capture?+
The pair compares high-yield credit risk against the cleanest cash-equivalent benchmark. HYG (iShares iBoxx $ High Yield Corporate Bond ETF, duration 3.5 years, SEC yield 7.5 percent) vs SHY (iShares 1-3 Year Treasury, duration 1.9 years, SEC yield 3.81 percent). The yield differential of approximately 370 basis points provides a direct read on the high-yield credit spread component. HY OAS sits at 280 basis points in April 2026, near 25-year tights versus long-run 550bp average.
How does HY OAS relate to HYG/SHY ratio?+
The HYG-SHY yield differential approximately tracks HY OAS plus duration premium. HYG SEC yield 7.5 percent minus SHY 3.81 percent equals 369 basis points, exceeding reported HY OAS (280bp) by approximately 90 basis points (the duration premium component). HYG/SHY ratio at 1.05 corresponds to OAS near 25-year tights. Ratio above 1.10 typically signals HY OAS below 250bp (very late-cycle); ratio below 0.95 signals OAS above 500bp; ratio below 0.80 signals acute crisis with OAS above 1000bp.
How did HYG vs SHY perform in 2008?+
2008 to 2009 GFC produced the largest credit cycle drawdown in modern history. HY OAS rose from 360bp (December 2007) to 1971bp (December 2008), a 1611bp widening over 12 months. HYG declined approximately 30 percent peak-to-trough; SHY rose approximately 6 percent. HYG/SHY ratio fell from 1.10 to 0.62 (43 percent ratio compression). After Fed PMCCF intervention, the ratio recovered to 0.95 by December 2009 and 1.05 by 2011 as HY OAS retraced to 500bp.
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