Concentration risk refers to the risk that a specific investment or group of investments could pose a threat to the financial stability of an institution or investment portfolio. There are several types of concentration risk that organizations may face, including:

1. Single issuer risk: The risk that a portfolio is heavily concentrated in securities issued by a single issuer.
2. Single industry risk: The risk that a portfolio is heavily concentrated in securities from a single industry.
3. Single geographic region risk: The risk that a portfolio is heavily concentrated in securities from a single geographic region.
4. Single asset class risk: The risk that a portfolio is heavily concentrated in a single asset class, such as stocks or bonds.
5. Key man risk: The risk that the performance of a portfolio is heavily dependent on a specific individual, such as a key executive or manager.
6. Counterparty risk: The risk that a counterparty to a financial transaction will not fulfill their obligations, resulting in financial losses for the institution or portfolio.

Here are a few examples of concentration risk:

1. A financial institution that has a large percentage of its loans concentrated in a single industry, such as real estate, could face concentration risk if there is a downturn in that industry.
2. An investment portfolio that is heavily concentrated in a single company’s stock could face concentration risk if the company experiences financial difficulties or a change in market conditions.
3. A financial institution that has a large percentage of its assets concentrated in a single geographic region could face concentration risk if there is economic instability or political unrest in that region.
4. An investment portfolio that is heavily concentrated in a single asset class, such as bonds, could face concentration risk if there is a change in market conditions that impacts the value of that asset class.
5. An organization that relies heavily on a specific individual, such as a key executive, could face concentration risk if that individual leaves the organization or is unable to fulfill their responsibilities.
6. A financial institution that has a large number of financial transactions with a single counterparty could face concentration risk if the counterparty is unable to fulfill their obligations.