What do U.S. Life Insurers Invest In?

April 24th, 2013
in econ_news, syndication

by Robert McMenamin, Anna Paulson, Thanases Plestis and Richard Rosen, Chicago Fed Letter

U.S. life insurance companies own more than $5.5 trillion dollars in real and financial assets and provide funding to other sectors of the economy through their investment activities. For example, life insurers own 6.0% of all outstanding credit market instruments in the U.S.1


Follow up:

Life insurers invest premiums that they receive from customers. They generally choose assets with features that are aligned with the characteristics of the insurance products that they sell. For example, proceeds from a long-term insurance product would be invested in a long-duration asset. This means that the risks from insurance liabilities will generally be balanced by the risks insurers assume through their investment activities.

At a fundamental level, life insurance companies sell products to satisfy two types of long-term demand. Some customers want protection from adverse financial consequences resulting from loss of life (life insurance) or from the exhaustion of financial resources over time (annuities). Other customers seek to earn a return on their premiums that can be withdrawn in the future (annuities meet this demand).

Because customers often make claims on and withdrawals from their policies years after they have been issued, life insurers face the challenge of investing customer payments to ensure they will have sufficient funds available to satisfy claims and withdrawals in the distant future. This generally leads life insurers to invest in a collection of long-term assets.

Life insurance company asset holdings

Figure 1 presents a breakdown of the assets held by the life insurance industry. As the figure shows, life insurers segregate their assets (and, by extension, their liabilities) into two independent “accounts” on their balance sheets—the general account and the separate account. General-account assets support liabilities that feature guaranteed returns to customers from the insurer. In contrast, separate-account assets support “pass-through” products, in which investment gains and losses are passed on to the customer and no more than a minimum return may be guaranteed.2

Click on table for larger image.


Typical general-account products include term life insurance, whole life insurance, fixed annuities, and disability insurance. Products whose payouts fluctuate based on the investment environment include variable annuities and variable life insurance. The assets that back these products are recorded on the separate account. The industry’s aggregate general account held $3.53 trillion in assets at the end of 2011, roughly double the $1.84 trillion in assets held in the separate account (see figure 1). The assets held in the two accounts were very different.

In the general account, fixed-income assets like bonds and mortgages constituted the largest share of invested assets, at 75.5% and 9.6%, respectively. Separate-account assets comprised primarily equities. Only 14.3% of separate-account invested assets were bonds, and mortgages made up only 0.5%. We focus our attention on general-account assets because life insurers typically do not pass investment gains and losses on these assets to their customers, so they must manage the associated valuation risk.

Corporate bonds make up the largest share of general-account assets. Insurers had $1.5 trillion of corporate bonds at the end of 2011, and corporate bonds accounted for 46.0% of all general-account invested assets (see figure 1). As a major corporate bond investor, the life insurance industry represents an important source of funding for U.S. corporations.3

Corporate bonds issued by industrial and manufacturing firms and financial firms each comprised about 27% of all corporate bonds held by insurers (see figure 2). No other industry accounted for more than 10% of insurer corporate bond holdings.

Click on graphic for larger image.


The recent global financial crisis was characterized by problems with financial firms and real estate. To measure the life insurance industry’s exposure to these areas, we compare their holdings with the total credit market instruments outstanding in these sectors. Overall, 29.6% of corporate bonds in 2011 were issued by financial firms.4 This share is comparable to the sector’s share of insurers’ holdings at 26.7%.
Insurers’ exposure to real estate comes through mortgage-backed securities (MBS) (14.8% of insurers’ invested assets), mortgage loans (9.6%), and real estate owned (0.6%).5

Therefore, we look at real estate as a share of total credit market instruments. The 25.0% of total real-estate-related holdings on insurers’ general account is somewhat less than the sector’s 38.7% share of all outstanding credit market instruments.6 This suggests that insurers are not overexposed to this market sector. However, it is important to keep in mind that different real-estate-related investments have different risk profiles. For example, mortgage loans have direct to real estate risk, whereas MBS investments have indirect exposure.  MBS issued by government-sponsored agencies, such as Fannie Mae or Freddie Mac, or guaranteed by Ginnie Mae, are guaranteed against defaults, so they are subject to prepayment risk (the risk that loans are paid off early). Nonagency MBS have default risk as well as prepayment risk.

Asset-valuation risk

The financial crisis provided a powerful demonstration that asset values can decline quickly. Some of the asset classes heavily favored by insurers, especially nonagency MBS, experienced major losses during the crisis. We estimate the potential decrease in the value of insurer assets from an extreme downturn in asset markets using data on market prices for a variety of financial instruments over the period from October 2002 through December 2012.7

We use the distribution of life insurer investments in combination with data on price fluctuations to estimate the potential downside risk from changes in asset prices. To do this, we match asset classes to price indexes that are likely to track the value of those assets closely and use the performance of the index to estimate the performance of the matched asset class (see box A for details on the matching process).

For each day in the sample period, we calculate the change in each price index over the past month. We also calculate the past-month change for a weighted average of the indexes, where the weights are the shares of the matched asset classes from the aggregate life insurance balance sheet. We then compute the standard deviations of these changes and estimate the loss in value that occurs with a particular frequency. We focus on a loss that would occur one month in every 60 months, or once in five years. This corresponds to a 2.13 standard deviation price change. It is important to note that we are estimating a loss in market value, not in book value. Much of the change in market value for fixed-income assets, such as bonds, is due to changes in interest rates.


The once-in-five-years losses vary across asset categories (see figure 3). At the high end, nonagency MBS are estimated to lose 28.2% in market value. In contrast, the corporate bond portfolio is estimated to lose 6.9%. The once-in-five-years loss for life insurance assets as a whole is estimated to be 7.8%, reflecting some benefits from diversification. Note that the historical period that we analyze includes the financial crisis, so the estimates of potential losses may somewhat overstate the risk going forward. Then again, the period leading up to the crisis, which is also included in the data, was a period of unusual calm in financial markets.

Our back-of-the-envelope calculations suggest that a severe shock to asset prices could reduce the value of the industry’s investments by 7.8%, or $280 billion, using third-quarter 2012 data. This corresponds to an 86% loss in total industry equity, which is $325 billion.8 However, because insurers make investments to match liabilities, these losses would be partially offset by gains on insurance liabilities. To gauge the extent to which losses would be offset, we calculate a once-in-five-year loss in life insurance equity using the SNL Life Insurance stock index over the 2002 to 2012 period. This loss is 22.8%, suggesting that 74% of the hypothetical loss in assets from a severe price shock would be offset by gains on insurance liabilities.9

Of course, this industry perspective may mask considerable variation at the individual firm level. Some insurance companies will have greater exposure to riskier asset classes and others will have less. Firms will also vary in the extent to which their liability gains would offset their losses on investments. Similarly, equity cushions differ across firms.


We have shown that life insurers invest in a wide variety of financial assets. Corporate bonds make up the largest share of their assets. Although insurers invest in a diverse set of industries, they have significant investments in industrial and manufacturing firms, financial firms, and real-estate-related securities. A severe shock to asset prices would reduce the value of life insurers’ asset holdings considerably. However, our calculations suggest that a significant portion of the losses on assets would be offset by gains on liabilities.


1 Based on 2012:Q3 data from the Board of Governors of the Federal Reserve System, 2012, Flow of Funds Accounts of the United States, statistical release, Washington, DC, December 6, available at
www.federalreserve.gov/releases/z1/Current/z1.pdf. Examples of credit market instruments include Treasury securities, mortgage-backed securities and mortgages, municipal securities, corporate and foreign bonds, consumer credit, and depository institution loans.

2 Not all gains and losses on separate-account assets are necessarily passed on to customers. Separate-account liabilities often include embedded guarantees. These guarantees are claims against the general account, and are therefore supported by general-account assets. These guarantees are more likely to be triggered when interest rates have declined sharply and when equity returns are very low. We do not address potential risks from embedded guarantees in this article.

3 According to the Board of Governors of the Federal Reserve System (2012), life insurers owned 17.8% of all corporate and foreign bonds as of 2012:Q3. (Note that this source classifies nonagency mortgage-backed securities as corporate bonds while we do not.)

4 Board of Governors of the Federal Reserve System (2012). Financial firms exclude asset-backed securities and real estate investment trusts.

5 MBS includes nonagency MBS and agency MBS, as reported in figure 1.

6 Board of Governors of the Federal Reserve System (2012).

7 Insurance companies do a much more extensive set of stress tests that examine the sensitivity of their capital to shocks in asset and interest rate markets, among other scenarios. In our example, we examine one particular stress at the industry (rather than firm) level.

8 According to 2012:Q3 data from SNL Financial and authors’ calculations.

9 See note 8.

Click on Box A for larger image.


Chicago Fed Letter No. 309, April 2013.

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