What are collateralized loan obligations (CLOs)?
CLOs are managed portfolios of bank loans that have been securitized into new instruments of varying credit ratings. CLOs have increasingly become the link between the financing needs of smaller companies and investors seeking higher yields.
Understanding CLOs
Explore the fundamentals of Collateralized Loan Obligations with our comprehensive primer. Plus, gain insights as Portfolio Manager Jessica Shill discusses how CLOs work, their benefits and key management strategies in our exclusive video.

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Size and history of the CLO market
CLOs have been part of the U.S. securitized products market since the late 1980s. Historically, most CLOs were privately sold to large institutional investors such as banks, insurance companies, and asset management companies.
The CLO market has grown impressively, reaching about $1.1 trillion in assets. With over $100 billion in new issuances annually in 2023 and 2024, it's quickly approaching the size of the $1.4 trillion corporate high-yield bond market. This growth demonstrates the CLO market's emerging significance and liquidity and highlights CLOs as a compelling option for investors seeking diversification and growth.

CLOs make up a significant portion of the $14 trillion U.S. global market
Source: Bank of America, as of December 31, 2024.
Six key characteristics of CLOs
1
Strong credit ratings
CLOs stand out for their robust credit quality, with approximately 80% of securities rated between AAA and A. In fact, no AAA rated CLO has ever defaulted in the asset class's 30+ year history.
2
A structure that honors credit quality
If collateral in the CLO is insufficient, cash flows for lower tranches are rerouted to higher tranches, beginning with AAA. Therefore, in times of market stress, the credit quality of the higher-rated tranches generally improves.
Over 70% of loans in a CLO must default to impair the AAA tranche. For context, the peak default rate during the Global Financial Crisis was 12%.
3
Floating interest rates
Floating-rate securities like CLOs have yields that adjust with benchmark rates, making them less sensitive to interest rate changes than most fixed-rate bonds, whose prices react inversely to rate shifts.
In the U.S., where fixed-rate bonds are more common, high-quality floating-rate options are scarce. Investors seeking floating-rate exposure often settle for lower credit-quality direct bank loans. CLOs offer an alternative, providing floating-rate exposure through investment-grade assets.
4
Attractive yields
Despite their higher credit ratings, CLOs have offered attractive yields relative to other fixed income asset classes. BBB rated CLOs tended to offer yields closer to the sub-investment grade bank loan and high-yield corporate bond markets. AAA tranches typically offered yields comparable to corporate bonds, notwithstanding their higher average credit quality.
One explanation for the higher yields is the relative newness of the market, including many investors’ lack of familiarity with CLOs.
5
Diversification
Most benchmark indexes, such as the Bloomberg U.S. Aggregate Bond Index, the Bloomberg U.S. Corporate High Yield Index, and the Bloomberg Global Aggregate Bond Index, are comprised of 100% fixed-rate bonds. Portfolios that are exclusively allocated to these indexes are negatively correlated to changes in interest rates – their prices go down when interest rates rise.
CLOs offer diversification from many fixed income markets in that they have exhibited relatively low correlations to the major asset classes. Given their floating-rate yields, the low correlation to fixed-rate bonds is not surprising.
6
Liquidity
Liquidity risk – the risk that an investor will not be able to quickly and easily sell an asset – is a key consideration for investors.
The strong growth of the CLO market has been accompanied by increased trading volumes and improving liquidity. In March 2020, when bond market volatility was peaking and volumes in many fixed income markets fell precipitously, trading volume in CLOs surged.
Meanwhile, the number of CLO managers has grown steadily, increasing both liquidity in the secondary market and willingness on the part of broker/dealers to transact and hold the products.
Risk considerations for CLOs
CLOs are complex, and while they usually have a high credit rating, they also have inherent risks.
- The underlying loans are issued to below-investment grade corporations whose revenues and cash flows may be affected by economic shifts, potentially impairing their ability to make loan payments.
- Borrowers have the ability to pay off their loans early, making CLOs subject to prepayment risk, which could lead to lower reinvestment interest rates for investors.
Why Janus Henderson for CLOs?
Expertise and leadership: Our portfolio management team's nearly 60 years of combined experience, backed by a dedicated global team, stands as a testament to our success. This unparalleled expertise ensures we remain at the forefront of CLO investment management.
2025 etf.com awards Active ETF of the Year - JAAA
etf.com highlighted JAAA's innovative approach to CLOs, as investors seek a balance of high yields and low relative interest-rate risk, amid market uncertainty.
Market Dominance: Janus Henderson's JAAA dominates the U.S. AAA CLO ETF market, capturing over 70% of its assets under management. JAAA also leads globally in inflows and ranks as the second largest active fixed income ETF, highlighting our innovative edge and market leadership.
Source: Morningstar Asset Flows as of March 31, 2025
$57B
Firmwide Securitized assets under management
Source: Janus Henderson Investors as of March 31, 2025.
Note: Firmwide assets include securitized products available outside of the U.S. and securitized portions of other fixed income strategies.
Dedicated CLO Expertise
Global Head of Securitised Products | Portfolio Manager
Head of Structured and Quantitative Fixed Income | Portfolio Manager
Portfolio Manager | Securitised Products Analyst