We establish property and casualty loss reserves to cover our estimated liability for the payment of all unpaid losses and loss expenses incurred with respect to premiums earned on our policies. Loss reserves are estimates of what we expect the ultimate settlement and administration of claims will cost, less what has been paid to date. These estimates are based upon actuarial projections and on our assessment of currently available data, as well as estimates of claims severity and frequency, legal theories of liability and other factors. For risks due to evolving changes in social, economic and environmental conditions, see the Risk Factor, “Unexpected and unintended claim and coverage issues under our insurance contracts may adversely impact our financial performance.”

Loss reserve estimates are refined periodically as experience develops and claims are reported and settled, potentially resulting in increases to our reserves. Increases in reserves would be recognized as an expense during the periods in which these determinations are made, thereby adversely affecting our results of operations for those periods. In addition, since reserve estimates of aggregate loss costs for prior years are used in pricing our insurance products, inaccurate reserves can lead to our products not being priced adequately to cover actual losses and related loss expenses in order to generate a profit.

We continue to receive asbestos and environmental ("A&E")&E claims, the vast majority of which relate to policies written before 1986. Estimating the ultimate gross reserves needed for unpaid losses and related expenses for asbestos and environmental claims is particularly difficult for insurers and reinsurers. The actuarial tools and other techniques used to estimate the ultimate cost of more traditional insurance exposures tend to be less precise when used to estimate reserves for some A&E exposures.

Moreover, the assumptions used to estimate gross reserves for A&E claims, such as claim frequency over time, average severity, and how various policy provisions will be interpreted, are subject to significant uncertainty. It is also not possible to predict changes in the legal and legislative environment and their effect on the future development of A&E claims. These factors, among others, make the variability of gross reserves estimates for these longer-tailed exposures significantly greater than for other more traditional exposures.

Effective December 31, 2016, the Company entered into an agreement with National Indemnity Company (“NICO”), a

inadequate if the frequency or severity of catastrophe losses changes over time or if the models we use to estimate the exposure prove inadequate. In addition, regulators or legislators could limit our ability to charge adequate pricing for catastrophe exposures or shift more responsibility for covering risk.

Terrorism is an example of a significant man-made caused potential catastrophe. Private sector catastrophe reinsurance is limited and generally unavailable for terrorism losses caused by attacks with nuclear, biological, chemical or radiological weapons. In addition, workers' compensation policies generally do not have exclusions or limitations for terrorism losses. Reinsurance coverage from the federal government under the Terrorism Risk Insurance Program (the "Program") Reauthorization Act of 20152019 (“TRIPRA”TRIPRA 2019”) is also limited and only applies for certified acts of terrorism that exceed a certain threshold of industry losses. Accordingly, the effects of a terrorist attack in the geographic areas we serve may result in claims and related losses for which we do not have adequate reinsurance. TRIPRA 2019 also requires that the federal government create the following reports, which could lead to additional legislation or regulation: (1) Treasury Department to include in its biennial report on the effectiveness of the Program an evaluation of the availability and affordability of terrorism risk insurance for places of worship; and (2) Government Accountability Office report to analyze and address the vulnerabilities and potential costs of cyber terrorism, to assess adequacy of coverage under the Program, and to make recommendations for future legislative changes to address evolving cyber terrorism risks. Further, the continued threat of terrorism and the occurrence of terrorist attacks, as well as heightened security measures and military action in response to these threats and attacks or other geopolitical or military crises, may cause significant volatility in global financial markets, disruptions to commerce and reduced economic activity. These consequences could have an adverse effect on the value of the assets in our investment portfolio. Terrorist attacks also could disrupt our operation centers. In addition, TRIPRA 2019 expires on December 31, 20202027 and if the U.S. Congress does not reauthorize the program or significantly reduces the government’s share of covered terrorism losses, the Company’s exposure to terrorism losses could increase materially unless it can purchase alternative terrorism reinsurance protection in the private markets at affordable prices or takes actions to materially reduce its exposure in lines of business subject to terrorism risk. For a further discussion of TRIPRA, see Part II, Item 7, MD&A - Enterprise Risk Management - Insurance Risk Management, Reinsurance as a Risk Management Strategy.

As a result, it is possible that any, or a combination of all, of these factors related to a catastrophe, or multiple catastrophes, whether natural or man-made, can have a material adverse

Our ability to attract, develop and retain talented employees, managers and executives is critical to our success. There is significant competition within and outside the insurance and financial services industry for qualified employees, particularly for individuals with highly specialized knowledge in areas such as underwriting, actuarial, data and analytics, technology and digital commerce.commerce and investment management. Our continued ability to compete effectively in our businesses and to expand into new business areas depends on our ability to attract new employees and to develop, retain and motivate our existing employees. The loss of any one or more key employees, including executives, managers and employees with strong technological, analytical and other specialized skills, may adversely impact the execution of our business objectives or result in loss of important institutional knowledge. Our inability to attract and retain key personnel could have a material adverse effect on our financial condition and results of operations.

We rely on a combination of contractual rights and copyright, trademark, patent and trade secret laws to establish and protect our intellectual property. Although we use a broad range of measures to protect our intellectual property rights, third parties may infringe or misappropriate our intellectual property. We may have to litigate to enforce and protect our intellectual property and to determine its scope, validity or enforceability, which could divert significant resources and may not prove successful. Litigation to enforce our intellectual property rights may not be successful and cost a significant amount of money. The inability to secure or enforce the protection of our intellectual property assets could harm our reputation and have a material adverse effect on our business and our ability to compete. We also may be subject to costly litigation in the event that another party alleges our operations or activities infringe upon their intellectual property rights, including patent rights, or violate license usage rights. Any such intellectual property claims and any resulting litigation could result in significant expense and liability for damages, and in some circumstances we could be enjoined from providing certain products or services to our customers, or utilizing and benefiting from certain patent, copyrights, trademarks, trade secrets or licenses, or alternatively could be required to enter into costly licensing arrangements with third parties, all of which could have a material adverse effect on our business, results of operations and financial condition.