OSI SYSTEMS INC

Rule 10b5-1 Trading Plans

Our directors and officers (as defined in Rule 16a-1 under the Exchange Act) may from time to time enter into plans or other arrangements for the purchase or sale of our shares that are intended to satisfy the affirmative defense conditions of Rule 10b5-1 (c) or may represent a non-Rule 10b5-1 trading arrangement under the Exchange Act. During the third quarter of fiscal 2026, none of our directors or officers informed us of theadoption, modification ortermination of a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” as those terms are defined in Regulation S-K, Item 408.

Code of Ethics & Conduct

As part of its review of our corporate governance policies, our Board of Directors adopted an updated Code of Ethics & Conduct (the “Updated Code”), effective May 1, 2026. The Updated Code is applicable to all Company employees, officers, and directors.

The Updated Code includes clarification around emerging risk areas as well as other non-substantive enhancements.

The foregoing description of the Updated Code is qualified in its entirety by reference to the full text of the Updated Code, which is filed as exhibit 14.1 to this Quarterly Report on Form 10-Q and incorporated herein by reference. The Updated Code is also publicly available on our website at http://www.osi-systems.com.