Our technologies and systems are used throughout various industries and in various applications. The approximately 459,000505,000 customers who purchase Parker products are found in almost every significant manufacturing, transportation and processing industry. No single customer accounted for more than 3%three percent of our total net sales for the year ended June 30, 2019.2021.

We offer hundreds of thousands of individual products, and no single product contributed more than 1%one percent to our total net sales for the year ended June 30, 2019.2021. Listed below are some of our principal products.

Parker operates in highly competitive markets and industries. We offer our products over numerous, varied markets through our divisions operating in 5045 countries. Our global scope means that we have hundreds of competitors across our various markets and product offerings. Our competitors include U.S. and non-U.S. companies. These competitors and the degree of competition vary widely by product lines, end markets, geographic scope and/or geographic locations. Although each of our segments has numerous competitors, given our market and product breadth, no single competitor competes with the Company with respect to all the products we manufacture and sell.

We own a number of patents, trademarks, copyrights, trade secrets and licenses related to our products. We also have exclusive and non-exclusive rights to use patents, trademarks and copyrights owned by others. In addition, patent and trademark applications are pending, although there can be no assurance that further patents and trademarks will be issued. We do not depend on any single patent, trademark, copyright, trade secret or license or group of patents, trademarks, copyrights, trade secrets or licenses to any material extent.

Backlog consists of written firm orders from a customer to deliver products and, in the case of blanket purchase orders, only includes the portion of the order for which a schedule or release date has been agreed to with the customer. The dollar value of backlog is equal to the amount that is expected to be billed to the customer and reported as a sale. Our backlog by business segment for the past two years is included in Part II, Item 7 of this Annual Report on Form 10-K and is incorporated herein by reference. Our backlog was $4.2$6.5 billion at June 30, 20192021 and $4.1$5.1 billion at June 30, 2018.2020. Approximately 9084 percent of our backlog at June 30, 20192021 is scheduled for delivery in the succeeding twelve months. Because of the breadth and global scope of our business, our overall business is generally not seasonal in nature.

Certain of our operations require the use and handling of hazardous materials and, as a result, the Company is subject to United States federal, state, and local laws and regulations as well as non-U.S. laws and regulations designed to protect the environment and regulate the discharge of materials into the environment. These laws impose penalties, fines and other sanctions for non-compliance and liability for response costs, property damage and personal injury resulting from past and current spills, disposals or other releases of, or exposures to, hazardous materials. Among other environmental laws, we are subject to the United States federal "Superfund" law, under which we have been designated as a "potentially responsible party" and may be liable for cleanup costs associated with various waste sites, some of which are on the United States Environmental Protection Agency’s Superfund priority list.

Our primary energy source for both of our business segments is electric power. While we cannot predict future costs of electric power, the primary source for production of the required electric power is expected to be coal and natural gas from coal and natural gas reserves available to electric utilities. We are subject to governmental regulations in regard to energy supplies in the United States and elsewhere. To date, we have not experienced any significant disruptions of our operations due to energy curtailments.

Our business is sensitive to global macro-economic conditions. Future macroeconomic downturns may have an adverse effect on our business, results of operations and financial condition, as well as our distributors, customers and suppliers, and on activity in many of the industries and markets we serve. Among the economic factors which may have such an effect are manufacturing and other end-market activity, global pandemics, currency exchange rates, air travel trends, difficulties entering new markets, tariffs and governmental trade and monetary policies, and general economic conditions such as inflation, deflation, interest rates and credit availability. These factors may, among other things, negatively impact our level of purchases, capital expenditures, and creditworthiness, as well as our distributors, customers and suppliers, and, therefore, the Company’s revenues, operating profits, margins, and order rates.

Our net sales derived from customers outside the United States were approximately 39%40 percent in 2019, 41%2021, 37 percent in 20182020 and 40%39 percent in 2017.2019. In addition, many of our manufacturing operations and suppliers are located outside the United States. The Company expects net sales from non-U.S. markets to continue to represent a significant portion of its total net sales. Our non-U.S. operations are subject to risks in addition to those facing our domestic operations, including:

If we are unable to successfully manage the risks associated with expanding our global business or adequately manage operational fluctuations internationally, the risks could have a material adverse effect on our business, results of operations or financial condition.

We rely extensively on information technology systems to manage and operate our business, some of which are managed by third parties. The security and functionality of these information technology systems, and the processing of data by these systems, are critical to our business operations. If these systems, or any part of the systems, are damaged, intruded upon, attacked, shutdown or cease to function properly (whether by planned upgrades, force majeure, telecommunications failures, criminal acts, including hardware or software break-ins or extortion attempts, or viruses, or other cybersecurity incidents) and we suffer any resulting interruption in our ability to manage and operate our business or if our products are effected,affected, our results of operations and financial condition could be materially adversely affected. As a result of the COVID-19 pandemic, certain of our employees continue to work from home, which may increase our vulnerability to cyber and other information technology risks. In addition to existing risks, any adoption or deployment of new technologies via acquisitions or internal initiatives may increase our exposure to risks, breaches, or failures, which could materially adversely affect our results of operations or financial condition. Furthermore, the Company may have access to sensitive, confidential, or personal data or information that may be subject to privacy and security laws, regulations, or other contractually-imposed controls. Despite our use of reasonable and appropriate controls, material security breaches, theft, misplaced, lost or corrupted data, programming, or employee errors and/or malfeasance could lead to the compromise or improper use of such sensitive, confidential, or personal data or information, resulting in possible negative consequences, such as fines, ransom demands, penalties, loss of reputation, competitiveness or customers, or other negative consequences resulting in adverse impacts to our results of operations or financial condition.

Demand for and supply of our products has been and may be adversely affected by numerous factors, some of which we cannot predict or control. Such factors include:

If any of these factors occur, the demand for and supply of our products could suffer, which could materially adversely affect the Company’s results of operations.

The markets we serve are characterized by rapidly changing technologies and frequent introductions of new products and services. Our ability to develop new products based on technological innovation can affect our competitive position and often requires the investment of significant resources. If we cannot develop, or have difficulties or delays developing new and enhanced products and services, or if we fail to gain market or regulatory acceptance of new products and technologies, our revenues may be materially reduced and our competitive position could be materially adversely affected. In addition, we may invest in research and development of products and services, or in acquisitions or other investments, that do not lead to significant revenue, which could adversely affect our profitability.

Our supply of raw materials could be interrupted for a variety of reasons, including availability and pricing. Furthermore, recently implemented changes to United States and other countries' tariff and import/export regulations have in the past and may in the future have a negative impact on the availability and pricing of raw materials. Prices for raw materials necessary for production have fluctuated significantly in the past and significant increases could adversely affect our results of operations and profit margins. Our efforts to manage these fluctuations by, among other things, passing along price increases to our customers, may be subject to a time delay between the increased raw material prices and our ability to increase the price of our products, or we may be unable to increase the prices of our products due to pricing pressure, contract terms or other factors. Any such inability to manage fluctuations could adversely impact our results of operations and cash flows.

From time to time, we are subject to litigation or other commercial disputes and other legal and regulatory proceedings relating to our business. Due to the inherent uncertainties of any litigation, commercial disputes or other legal or regulatory proceedings, we cannot accurately predict their ultimate outcome, including the outcome of any related appeals. An unfavorable outcome could materially adversely impact our business, financial condition and results of operations. Furthermore, as required by U.S. generally accepted accounting principles,GAAP, we establish reserves based on our assessment of contingencies, including contingencies related to legal claims asserted against us. Subsequent developments in legal proceedings may affect our assessment and estimates of the loss contingency recorded as a reserve and require us to make payments in excess of our reserves, which could have an adverse effect on our results of operations.

We are subject to national and international laws and regulations, such as the anti-corruption laws of the U.S. Foreign Corrupt Practices Act and the U.K. Bribery Act, relating to our business and our employees. Despite our policies, procedures and compliance programs, our internal controls and compliance systems may not be able to protect the Company from prohibited acts willfully committed by our employees, agents or business partners that would violate such applicable laws and regulations. Any such improper acts could damage the Company's reputation, subject us to civil or criminal judgments, fines or penalties, and could otherwise disrupt the Company's business, and as a result, could materially adversely impact our business, financial condition and results of operations.

Further, our operations are subject to certain antitrust and competition laws in the jurisdictions in which we conduct our business, in particular the United States and Europe. These laws prohibit, among other things, anticompetitive agreements and practices. If any of our commercial agreements or practices are found to violate or infringe such laws, we may be subject to civil and other penalties. We may also be subject to third-party claims for damages. Further, agreements that infringe antitrust and competition laws may be void and unenforceable, in whole or in part, or require modification in order to be lawful and enforceable. Accordingly, any violation of these laws could harm our reputation and could have a material adverse effect on our earnings, cash flows and financial condition.

Our businesses expose us to potential product liability risks that are inherent in the design, manufacture and sale of our products and the products of third-party vendors that we use or resell. Significant product liability claims could have a material adverse effect on the Company’s financial condition, liquidity and results of operations. Although we currently maintain what we believe to be suitable and adequate product liability insurance, there can be no assurance that we will be able to maintain our insurance on acceptable terms or that our insurance will provide adequate protection against all potential significant liabilities.

Protecting our intellectual property is critical to our innovation efforts. We own a number of patents, trade secrets, copyrights, trademarks, trade names and other forms of intellectual property related to our products and services throughout the world and the operation of our business. We also have exclusive and non-exclusive rights to intellectual property owned by others. Our intellectual property may be challenged, stolen or otherwise infringed upon by third parties or we may be unable to maintain, renew or enter into new license agreements with third-party owners of intellectual property on reasonable terms. In addition, the global nature of our business increases the risk that our intellectual property may be subject to infringement, theft or other unauthorized use or disclosure by others. In some cases, our ability to protect our intellectual property rights by legal recourse or otherwise may be limited, particularly in countries where laws or enforcement practices are inadequate or undeveloped. Unauthorized use or disclosure of our intellectual property rights or our inability to protect intellectual property and preserve existingassociated intellectual property rights could lead to reputational harm and/or adversely impact our competitive position and results of operations.