Structured Synthetic Hybrids: When CDOs Blend Credit and Equity Risk
Book: Structured Finance and Insurance: The ART of Managing Capital and Risk Author: Christopher L. Culp Publisher: Wiley Finance, 2006 ISBN: 978-0-471-70631-1
Chapter 19 is short but fascinating. It covers a product type that was brand new at the time of writing: structured synthetic hybrids. These are essentially CDO structures that blend credit risk and equity risk into a single package. If synthetic CDOs were cool because they used credit default swaps instead of actual bonds, structured synthetic hybrids take it further by throwing equity default swaps into the mix.
The result is a product that gives investors exposure to both a company’s debt and equity risk through a single structured security. That’s the hybrid part. And it’s all done synthetically through derivatives. No actual bonds or stocks need to change hands.
The Key Ingredient: Equity Default Swaps
The whole category depends on one product: the equity default swap (EDS). Remember from earlier chapters that an EDS is basically a deeply out-of-the-money, long-dated equity put option. But it’s built to look and feel like a credit default swap (CDS). The “equity event” that triggers a payout is usually something dramatic, like a 70 percent decline in the stock price of the reference company.
Here’s the interesting relationship between EDSs and CDSs. Since equity sits below debt in the capital structure, a company’s stock price will almost always crash before the company actually defaults on its debt. So an EDS will trigger before a CDS on the same company nearly every time. But the reverse is also true: if a company defaults on its debt (triggering a CDS), its stock has almost certainly already collapsed (meaning the EDS would have triggered first).
This creates a spread between EDS and CDS premiums. The EDS premium is higher because the probability of trigger is higher. And that spread? It becomes a source of extra yield for clever structured products.
Equity Default Obligations (EDOs)
The simplest hybrid structure is an equity default obligation, or EDO. It’s a synthetic CDO where some or all of the synthetic collateral consists of equity default swaps instead of credit default swaps.
Take the Zest deal from March 2004, arranged by Daiwa Securities. The reference portfolio was 30 blue-chip Japanese firms. An SPE acquired exposure to these firms through a portfolio EDS with a single counterparty. The equity event for each name was a 70 percent stock price decline, and the payoff was a percentage of the stock price. The SPE issued five tranches of securities against this portfolio, with the top three rated A3, Baa2, and Ba2 by Moody’s.
Pretty straightforward as these things go. But not all EDOs are long-only. The CEDO I deal from May 2005 (Credit Suisse First Boston) had 60 long EDSs and 60 short EDSs. Basically a hedge fund strategy wrapped in CDO technology. The long EDSs were the “Risk Portfolio” and the short EDSs were the “Insurance Portfolio.” Long-short equity risk inside a structured product. That’s creative.
Hybrid CDOs: Mixing Credit and Equity
When you combine EDSs and CDSs in the same structure, you get a hybrid CDO. The first major one was Odysseus, arranged by JPMorgan in December 2003. The reference portfolio had 100 blue-chip firms with a notional value of 1.2 billion euros. Ninety percent of the exposure came through CDSs and 10 percent through EDSs. The equity events were defined as 70 percent stock price declines with a 50 percent recovery rate. It was a single-tranche structure, with one 30 million euro mezzanine tranche rated Aa2.
The idea is that blending a bit of equity exposure into a mostly credit portfolio changes the loss distribution in a way that can actually enhance yields for investors while still maintaining decent ratings.
The Really Complex Version: Nth-to-Default Basket Hybrid CDOs
And then there’s Chrome Funding ACEO from September 2004, which takes things to another level entirely. This deal defined 30 baskets, each containing four reference names. Inside each basket were three CDSs and one EDS. No overlap of names across baskets. The SPE then sold protection in the form of 30 second-to-default basket swaps.
Why second-to-default? Because in most cases, the EDS will fire before any CDS (stock drops 70 percent before a debt default). So the first “default” in each basket is probably the equity event. That means the second default, the one that triggers payments, is likely the first actual credit event.
The capital structure had four levels of subordinated debt, with the first-loss piece, super-senior tranche, and the gaps between layers all retained and delta-hedged by the issuer. The notes were rated between A1 and Aaa.
I find this structure genuinely impressive from a financial engineering perspective. As analysts at the time pointed out, you can think of the whole thing as a CDO-squared of single-tranche synthetic CDOs. The EDSs add risk because they fire more easily, but that’s offset by the basket being a second-to-default structure. And the EDS reference names had higher average ratings (A1) than the CDS names (A2) to further balance things out. The net result is slightly more risk but meaningfully more spread. Capital structure arbitrage built right into the product.
Rebound Notes
The last product in this chapter is the rebound note. This one is particularly clever. A rebound note combines three things on a single reference company: a floating-rate note issued by that company, a CDS where the investor buys credit protection, and an EDS where the investor sells equity protection.
Here’s how the payoffs work:
If nothing bad happens, the investor gets the FRN yield plus the difference between the EDS premium collected and the CDS premium paid. That difference is positive because EDS premiums are higher than CDS premiums on the same name. Nice and smooth.
If the equity event occurs but no credit event, the investor can be completely wiped out. The stock crashed 70 percent, the EDS triggers, and the investor loses their principal.
But here’s the twist. If the equity event occurs and then the credit event follows, the principal rebounds back to the investor. The CDS protection kicks in and covers the loss.
The name “rebound” comes from this last scenario. Your money disappears and then comes back. It only works if the credit event follows the equity event. The investor is essentially betting that if a stock crashes badly enough to trigger the EDS, the company is either going to recover (and the investor is fine) or go all the way to default (and the CDS protection saves them). The dangerous scenario is the one in between: stock crashes, company limps along without actually defaulting, and the investor eats the loss.
What’s Really Going On Here
Culp makes a nice theoretical point about rebound notes. If you think about debt as a loan plus a short put on firm assets, and equity as a long call on firm assets (the Modigliani-Miller view), then the EDS-CDS spread reflects the difference in option premiums for the equity and credit trigger levels. In an M&M world, this spread is just compensation for the different risk levels. In reality, the two can diverge, creating arbitrage opportunities.
So rebound notes aren’t really corporate financing instruments. Nobody is issuing them to raise money. But they increase the efficiency of capital markets by helping enforce the theoretical relationship between debt and equity values for the same company. If the EDS-CDS spread gets out of line, rebound notes (and the other hybrids) create a mechanism for the market to push it back.
My Take
This chapter is short because the market was brand new at the time. Only a handful of deals had been done. Culp was clearly watching this space develop in real time and felt it was important enough to include even in its early stage.
What strikes me about these products is how they represent the logical endpoint of the synthetic CDO evolution. Once you realize you can replace cash bonds with CDS contracts, and once equity default swaps start trading, it’s only natural that someone would combine the two. The financial engineering toolkit keeps expanding, and each new tool gets remixed with everything that came before.
Whether these specific structures survived and grew after 2006 is a separate question. But the underlying logic of blending credit and equity exposure through structured products feels permanently relevant. Capital structure arbitrage isn’t going away.