The Danger of a Concentrated Portfolio
Imagine your investment portfolio is a basket of eggs. A diversified portfolio carefully places eggs from different birds into many baskets. A concentrated portfolio, however, puts all or most of its eggs in one or two baskets. In the world of corporate
bonds, this means investing a large portion of your money in debt issued by a single company or a small handful of companies. While it might seem smart to back a company you believe in, this strategy magnifies your risk. If that one company stumbles, your entire investment is in jeopardy. Concentration risk isn't just about holding one bond; it can also mean being over-exposed to a single industry. If an economic downturn hits that specific sector, all your investments could suffer simultaneously.
What 'Default' Really Means for You
A bond is essentially a loan you make to a company. In return, the company promises to pay you regular interest and return your principal amount at a future date. A 'default' occurs when the company fails to make these promised payments. This could be a missed interest payment or a failure to repay the principal when the bond matures. When this happens, the value of that bond can plummet almost overnight. For the investor, the steady income stream stops, and the original capital is now at risk. While there are legal processes for bondholders to recover some of their money, it can be a long, complicated journey with no guarantee of getting everything back. You might end up with a fraction of your original investment, new shares in a restructured company, or in some cases, nothing at all.
Lessons from India’s Credit Crises
The risk of concentration is not just theoretical; it has played out in the Indian market with significant consequences. The defaults by major non-banking financial companies (NBFCs) like IL&FS and Dewan Housing Finance Corporation (DHFL) a few years ago serve as powerful cautionary tales. Many debt mutual funds had heavily invested in these companies, with some funds holding more than 10% of their assets in a single issuer. When these giants defaulted, the Net Asset Values (NAVs) of the overly concentrated funds fell sharply, catching many investors by surprise who believed debt funds were entirely safe. These events highlighted a crucial lesson: even a well-known company with a decent credit rating can face financial trouble, and if your portfolio is heavily reliant on it, the fallout can be severe.
Diversification: Your Strongest Defence
The most effective strategy to protect yourself from a single issuer default is diversification. It is the simple principle of not putting all your eggs in one basket. In bond investing, this means spreading your money across various dimensions. First, diversify by issuer. Instead of just one or two companies, invest in bonds from a wide range of corporations across different sectors, including Public Sector Undertakings (PSUs) and private firms. Second, diversify by credit quality. While AAA-rated bonds are the safest, a portfolio can include a mix of highly-rated (AAA, AA) and medium-rated bonds to balance safety with returns. Finally, diversify by maturity. Holding bonds with different maturity dates—short, medium, and long-term—helps manage interest rate risk and provides liquidity. For most retail investors, the easiest way to achieve this is by investing in a well-managed debt mutual fund that already holds a diversified basket of bonds.
How to Spot Concentration Risk
Being a proactive investor is key. If you invest directly in bonds, review your holdings to ensure no single company represents an uncomfortably large portion of your debt allocation. If you invest through debt mutual funds, the fund's monthly factsheet is your best friend. Look at the 'Top 10 Holdings' section. A well-diversified fund will have its assets spread out, with no single issuer—especially a private corporation—dominating the list. As a rule of thumb, if a fund has more than 5-10% in a single private company's bonds, it is taking on significant concentration risk. Pay attention to the credit ratings of the bonds in the portfolio. A heavy allocation to lower-rated papers (below AA) indicates a higher-risk strategy that should be scrutinised carefully.
