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Credit Ratings

Rating Changes and Prices

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Rating Changes and Prices

A rating change—upgrade or downgrade—immediately reprices a bond. An upgrade usually drives a modest price gain (spreads tighten, index buying occurs). A downgrade triggers sharper losses through multiple channels: the bond's credit spread widens, interest rates may rise in risk-off conditions, and if the downgrade crosses the IG/HY cliff, index funds and policy-constrained portfolios are forced to sell. Understanding the magnitude and drivers of these moves helps investors anticipate losses, manage exposure, and sometimes identify opportunities in newly downgraded credits.

Key takeaways​

  • Upgrades typically drive 2–5% price gains, reflecting spread compression and positive sentiment. Gains are often smaller because markets anticipate upgrades before they are formal.
  • Downgrades drive 5–15% price losses, sometimes more. The loss comes from spread widening, forced selling, and potentially an entire-market risk-off move.
  • Fallen angels (downgrades from IG to HY) suffer sharper losses (10–25%) due to the cliff effect: index removal, policy flush, and the psychological switch from "safe" to "risky."
  • Market anticipation matters: a downgrade that is widely expected (bond has been on negative watch for weeks, spreads have already widened) produces smaller moves than a surprise downgrade.
  • Timing of the downgrade relative to the market close and news flow can amplify or dampen price impact.

How markets price rating changes​

In an efficient market, rating changes should be surprises—already known information is reflected in the bond's price. However, rating agencies typically publish ratings before markets close, and trading is often suspended (or thin) during the announcement, creating mechanical repricing.

The typical downgrade sequence:

  1. Day of announcement (e.g., Monday 4 PM): Rating agency issues downgrade press release after market close (typically 3–5 PM). The bond's last trade of the day may have been at 99 (a BBB-rated yield); the downgrade is not yet reflected.

  2. After-hours and next morning: Dealers and traders receive the downgrade news. They adjust their quotes to reflect the new BB rating. A dealer might widen bid-offer spreads (because of uncertainty and illiquidity) or begin covering shorts (if they were short the bond expecting a downgrade).

  3. Market open next day: Institutional investors see the downgrade and execute sales or hedges. If the downgrade crosses the IG/HY boundary, index funds and policy-constrained funds begin forced selling. A new equilibrium price emerges (lower).

  4. Ensuing days: Further selling (or buying, if contrarian) continues until supply and demand balance.

Upgrade mechanics and typical gains​

An upgrade from BB to BB+ or from BBB− to BBB typically produces:

  • Immediate repricing: Spreads tighten. If spreads tighten by 50 bps on a 5-year bond, the price gain is roughly 2.5%.
  • Index buying: If the upgrade moves the bond from non-index to index-eligible, index funds buy it. For a smaller issuer, index inflows can be 10–20% of the bond's outstanding amount, creating price support.
  • Analyst upgrades: Sell-side credit analysts may upgrade their price targets or initiate coverage, attracting retail and small institution buying.

Typical upgrade price moves:

  • BB+ to BBB−: 3–5% gain.
  • BBB− to BBB: 2–4% gain (smaller because the spread change is modest).
  • A− to A: 1–2% gain (very small; both are liquid, minimal index effects).

Upgrades are often relatively small because markets anticipate them. A bond with positive watch in place has already been repriced upward; the formal upgrade produces less surprise.

Downgrade mechanics and larger losses​

Downgrades are more impactful than upgrades because:

  1. Spread widening is larger: Moving from BBB to BB means spread widening from 150–200 bps to 250–400 bps—a 100–200 bps move. Moving from BB to BBB yields only 100–200 bps of tightening.

  2. Risk-off spillover: A downgrade (especially of a large issuer) often triggers broad credit weakness. Risk appetite falls; all spreads widen. A specific downgrade can be accompanied by 20–50 bps of general widening across the entire credit sector.

  3. Forced selling: A downgrade from BBB− (IG) to BB+ (HY) triggers index funds and policy-constrained funds to sell. This mechanical selling can overwhelm normal supply-demand balance.

  4. Liquidity evaporation: In the stress surrounding a downgrade, dealers widen bid-offer spreads and reduce position size. Selling becomes difficult, and prices fall further.

Typical downgrade price moves:

  • BBB to BB (non-cliff): 5–10% loss.
  • BBB− to BB+ (cliff downgrade): 10–20% loss.
  • A to BBB: 3–5% loss.
  • BB to B: 5–10% loss.

The larger moves occur at rating cliff boundaries (IG/HY) and for surprise downgrades.

Fallen angels: the cliff effect​

A bond downgraded from BBB− to BB+ is called a fallen angel and suffers disproportionate losses. Research on fallen angels documents:

  • 2008–2009 financial crisis: Fallen angels experienced average losses of 20–40% in the 90 days following downgrade.
  • 2020 COVID pandemic: Airlines and retailers downgraded from IG to HY suffered 15–35% losses.
  • Normal times (no crisis): Fallen angels still lose 10–20% in the month following downgrade.

The cliff effect explains why:

  1. Index removal effect: A bond removed from the Bloomberg Aggregate (and other IG indices) due to a downgrade triggers selling from hundreds of index-tracking funds. The selling can be automated or forced by fund policy.

  2. Policy breach: Funds with IG-only mandates must immediately sell downgraded bonds or face policy violation. Many funds wait for the downgrade to be official to avoid front-running; the downgrade day itself can see enormous selling pressure.

  3. Repricing across rating categories: When a bond moves from BBB to BB, it competes with other BB bonds for capital. BB bonds trade at substantially higher yields; the newly downgraded bond's yield must rise to the BB market yield, depressing price.

  4. Psychological shift: A bond that was "investment-grade" yesterday is "junk" today. This shift alone changes the investor base (conservative funds exit, yield funds enter) and market structure.

Examples of recent downgrade events​

Ford Motor Company, 2020: Ford was downgraded from BBB− (IG) to BB (HY) in March 2020 as COVID-19 disrupted automotive production. Ford bonds due in 2025 were trading around 95 (BBB yields) the day before downgrade; by the day after downgrade, they traded around 85–88 (BB yields). That is an 7–10% loss in 24 hours.

GE (General Electric), 2018: GE was downgraded from A to BBB+ on concerns about insurance liabilities and industrial weakness. GE bonds did not cross the IG/HY boundary but did experience 5–8% losses in the weeks following downgrade as GE spreads widened and investor interest fell.

Energy sector, 2015–2016: As oil prices collapsed, dozens of energy companies were downgraded from IG to HY. Fallen angels like Dril-Quip, Ensco, and others lost 20–35% in the 3 months following downgrade as the sector repriced.

Timing and market conditions​

The impact of a downgrade depends on market conditions:

  • During calm markets: Downgrades are isolated events; price impact is contained (5–10%). The bond reprices to its new BB level and begins trading normally.

  • During stress: Downgrades can cascade. One downgrade triggers selling, which depresses prices, which can trigger further downgrades (if leverage metrics worsen). Downgrades during 2008, early 2020, and 2022 show this pattern.

  • After-market vs. pre-market: A downgrade announced after the market close (3–5 PM) leaves dealers and investors overnight to adjust quotes. The repricing can be severe the next morning, with large bid-ask spreads. A downgrade announced during the day allows some orderly repricing.

Market anticipation and watch periods​

A downgrade that is widely anticipated (bond has been on negative watch for weeks, spreads have already widened materially) produces smaller price moves than a surprise downgrade.

Example: Anticipated vs. surprise downgrade

Anticipated: Bond rated BBB− on negative watch for 6 weeks. Spreads widen from 150 bps to 220 bps during the watch. On downgrade day, spreads widen from 220 to 280 bps (the bond's equilibrium BB spread). Total price loss from negative watch to post-downgrade: ~10%. Price loss on downgrade day alone: ~3%.

Surprise: Bond rated BBB− with no watch. Spreads are 150 bps (tight, no concern). Downgrade announcement (surprise) widens spreads from 150 to 300 bps (overshooting because of the surprise and illiquidity). Total price loss: ~15%.

This illustrates why investors should monitor watch lists. A watch placement is a warning signal; it allows proactive positioning (selling before the forced selling, or buying if contrarian).

Post-downgrade recovery and opportunities​

Bonds often stabilize and partially recover in the weeks/months following a downgrade:

  • Mechanical selling ends: Once forced selling by index funds and policy-constrained portfolios is complete, supply is exhausted.
  • Price stabilizes: A new equilibrium yield is established; the bond begins trading normally at its new rating and spread.
  • Opportunistic buying: Value investors (who believe the issuer's fundamentals do not warrant the new rating or spread) buy the downgraded bond at depressed prices. If the issuer survives (does not default), the bond can appreciate.

Example: After the Ford downgrade in March 2020, Ford BB bonds stabilized by June at yields around 6–7%. Over the next 12 months, as Ford's business recovered and oil prices rose, Ford gradually was re-upgraded toward the IG boundary. Bonds purchased at the trough in June outperformed substantially by year-end.

Post-downgrade opportunities are real but carry execution risk (the issuer could default, not recover) and timing risk (recovery can take years). Successful post-downgrade investing requires conviction, patience, and diversification.

Multiple simultaneous downgrades: sector stress​

When multiple bonds in a sector are downgraded simultaneously (energy in 2016, technology in 2022), the repricing is often sharper because:

  1. Supply shock: Dozens or hundreds of fallen angels are available for sale simultaneously.
  2. Index rebalancing shock: Index funds must execute large sales at the same time, creating pressure.
  3. Credit concerns generalize: Investors become cautious about the whole sector; spreads widen not just for downgraded bonds but for all sector bonds.

During broad downgrade waves, even bonds that are not downgraded but are in the affected sector experience repricing (spreads widen) due to sector correlation.

Hedging downgrade risk​

Investors concerned about downgrade risk can hedge via:

  • Credit default swaps (CDS): Buy CDS protection on the bond; if downgraded and price falls, CDS payoff offsets the loss.
  • Selling shorter duration: Reduce duration risk; if the bond is downgraded but rates don't move, a shorter-duration bond experiences a smaller loss.
  • Diversification: Hold many bonds; if one is downgraded, the loss is small relative to the portfolio.
  • Selling on watch: Exit the position once a watch is placed, before the downgrade's price impact fully hits.

Flowchart​

Next​

With a comprehensive understanding of how credit ratings work—from the agencies' methodologies to the rating scales, the investment-grade cliff, the process of analysis and monitoring, and the mechanics of price moves—you are equipped to evaluate bonds with greater sophistication. The next chapter builds on this foundation, exploring the specific risks within the bond market and strategies for constructing resilient fixed-income portfolios.