Our analysis found there was a significant mismatch in sector exposure between the proposed benchmark and the hypothetical portfolio used to determine the plan's liability discount rate. The benchmark had a large exposure to bonds of government agencies and local authorities through its 40% weighting in the Bloomberg U.S. Aggregate AA Index, while the liability discount rate did not include these bonds.
Bonds rated AA made up more than 50% of the proposed benchmark. A limited universe of such bonds increases concentration risk and makes it more challenging for active investment managers to add value through security selection.
Just 25% of the proposed benchmark was allocated to the Bloomberg U.S. Long Credit Index (bonds with 10+ years to maturity). These long bonds play an out-sized role in determining the plan’s liability discount rate. Also, similarly to the liability, long bonds are relatively sensitive to changes in interest rates.
Given the shortcomings of the proposed benchmark, we constructed an alternative benchmark to meet the plan sponsor's three criteria and address our key concerns.
U.S. investment-grade (BBB/Baa and above) corporate bonds accounted for 75% of our alternative benchmark, providing broad exposure to the asset class. For the remainder, we included a 25% exposure to U.S. Treasury bonds, an extremely liquid and conservative sector. This provided both high credit quality aligned with the discount rate and greater exposure to longer-duration bonds, which better matched the long duration profile of the pension plan's liabilities.
The plan sponsor asked us to analyze a proposed benchmark
This U.S. defined benefit plan sought a benchmark for its fixed income assets that would better align the plan's assets with the liability discount rate used to value its pension obligations. The liability discount rate was based on the yield of a hypothetical portfolio of high-quality U.S. corporate bonds that matched the plan's projected cash flows.
Our analysis found the proposed benchmark fell short
The client's proposed benchmark included exposure to government agency bonds with no counterpart in the hypothetical portfolio underlying the liability discount rate. In addition, the benchmark had sizable exposure to a constrained, less-liquid universe of AA-rated bonds. And it lacked sufficient exposure to longer-term bonds that better matched the plan's long-dated liabilities.
Our alternative benchmark aimed for better alignment
Our benchmark sought to provide close alignment with the liability discount rate, while focusing on high credit quality. The benchmark featured a more liquid pool of securities that active investment managers can use to build and manage a portfolio. A larger opportunity set, more diversification and improved liquidity should potentially lead to better active management outcomes.
Bloomberg U.S. Aggregate AA Index represents the AA-rated component of the U.S. investment-grade fixed-rate bond market. This index is unmanaged, and its results include reinvested dividends and/or distributions but do not reflect the effect of sales charges, commissions, account fees, expenses or U.S. federal income taxes.
Bloomberg U.S. Long Corporate AA Index is a market-value weighted index that tracks the total return results of publicly issued AA-rated U.S. corporate and specified foreign debentures and secured notes that meet the specified maturity, liquidity, and quality requirements, with maturities of 10 years or more. To qualify, bonds must be SEC-registered and must be an investment grade security. This index is unmanaged, and its results include reinvested distributions but do not reflect the effect of sales charges, account fees, expenses or U.S. federal income taxes.
The Bloomberg U.S. Government Index includes U.S. dollar-denominated, fixed-rate, nominal U.S. Treasuries and U.S. agency debentures (securities issued by U.S. government owned or government sponsored entities, and debt explicitly guaranteed by the U.S. government).
Bloomberg U.S. Long Credit Index is a market-value weighted index that tracks the total return results of publicly issued U.S. corporate and specified foreign debentures and secured notes that meet the specified maturity, liquidity, and quality requirements, with maturities of ten years or more. To qualify, bonds must be SEC-registered and must be an investment grade security. This index is unmanaged, and its results include reinvested distributions but do not reflect the effect of sales charges, account fees, expenses or U.S. federal income taxes.
Bloomberg U.S. Credit Index is a market-value weighted index that tracks the total return results of publicly issued U.S. corporate and specified foreign debentures and secured notes that meet the specified maturity, liquidity, and quality requirements. To qualify, bonds must be SEC-registered and must be an investment grade security. This index is unmanaged, and its results include reinvested distributions but do not reflect the effect of sales charges, account fees, expenses or U.S. federal income taxes.
A pension plan's liability discount rate is used to calculate the present value of future benefit payments.
Duration refers to a bond or index's sensitivity to changes in interest rates.
Credit quality is a measure of a debt issuer's ability to make all contractual interest and principal payments.