18. Supplier and Customer Concentrations

The Company utilizes a number of glass compositions in manufacturing its molded glass aspheres and lens array products. These glasses or equivalents are available from a large number of suppliers, including CDGM Glass Company Ltd., Ohara Corporation, and Sumita Optical Glass, Inc. Base optical materials, used in certain of the Company’s products, are manufactured and supplied by a number of optical and glass manufacturers. The Company also utilizes major infrared material suppliers located around the globe for a broad spectrum of infrared crystal and glass. Historically, the Company has sourced Germanium from suppliers located in Russia and China. At the start of the war in Ukraine, all purchases of Germanium from vendors in Russia ceased and the Company has been purchasing Germanium only from vendors in China. In 2023, China began imposing export restrictions on Germanium and has continued to increase those restrictions over time, as further described in Note 15, Contingencies, to these Consolidated Financial Statements. The Company believes that a satisfactory supply of such production materials will continue to be available, however, with longer lead times and higher prices for Germanium in particular, although there can be no assurance in this regard.

In fiscal year 2025, the Company had sales to three customers that comprised an aggregate of approximately 23% of its annual revenue, and 28% of its June 30, 2025 accounts receivable. Sales to these customers as a percentage of our fiscal year 2025 revenue include one customer at 9%, another customer at 7%, and the third customer at 6%. One of these customers comprised 18% of accounts receivable, a second customer comprised 7% of accounts receivable and a third customer comprised 3% of the accounts receivable balance as of June 30, 2025. It should be noted that one of those customers is a G5 Infrared customer, and does not reflect a full year of revenue and therefore has a higher concentration of accounts receivable than revenue. In fiscal year 2024, the Company had sales to three customers that comprised an aggregate of approximately 25% of its annual revenue, and 16% of its June 30, 2024 accounts receivable. Sales to these customers as a percentage of our fiscal year 2024 revenue include one customer at 12%, another customer at 7%, and the third customer at 6%. One of these customers comprised 11% of accounts receivable, a second customer comprised 3% of accounts receivable and a third customer comprised 1% of the accounts receivable balance as of June 30, 2024. The loss of any of these customers, or a significant reduction in sales to any such customer, would adversely affect the Company’s revenues.

In fiscal year 2025, 38% of the Company’s net revenue was derived from sales outside of the U.S., with 91% of foreign sales derived from customers in Europe and Asia. In fiscal year 2024, 39% of the Company’s net revenue was derived from sales outside of the U.S., with 94% of foreign sales derived from customers in Europe and Asia.