SCORE™ ABOUT CUSTOMER CENTER SUPPLIER CENTER QUALITY INVESTORS CONTACT SEC XRBL Filings XBRL (Extensible Business Reporting Language) is a language for the electronic communication of financial and business data. XBRL is one of many languages in the XML family for displaying information on the Internet. In early 2009, the U.S. Securities and Exchange Commission (SEC) adopted rules requiring public companies to provide their financial statements in XBRL format and to post their financial statements in XBRL format on their corporate websites. These rules did not immediately apply to all public companies, but rather have been phased-in gradually over the last several years. File collections of SigmaTron’s XBRL financial statements are listed below: FY22 » SigmaTron XBRL July 31, 2021 (Download .zip file) FY21 » SigmaTron XBRL April 30, 2021 (Download .zip file) » SigmaTron XBRL January 31, 2021 (Download .zip file) » SigmaTron XBRL October 31, 2020 (Download .zip file) » SigmaTron XBRL July 31, 2020 (Download .zip file) FY20 FY19 FY18 FY17 FY16 FY15 FY14 FY13 INVESTORS QUICK LINKS LEADERSHIP » COMMITTEE CHARTERS - AUDIT COMMITTEE » - COMPENSATION COMMITTEE » - NOMINATING COMMITTEE » SEC REULATORY FILINGS - ANNUAL REPORTS » - SEC XRBL FILINGS » - STOCK INFORMATION » CONTACT INFORMATION Henry J. Underwood Corporate Counsel, Assistant Secretary Howard & Howard Attorneys PLLC 200 South Michigan Avenue Chicago, IL 60604 James J. Reiman Chief Financial Officer, Vice President Finance, Treasurer and Secretary Investor Relations: 800-700-9095 © 2021 SigmaTron International, Inc. All rights reserved. ABOUT CUSTOMER CENTER SUPPLIER CENTER QUALITY INVESTORS CONTACT

SCORE™ ABOUT CUSTOMER CENTER SUPPLIER CENTER QUALITY INVESTORS CONTACT CUSTOMER CENTER DOCUMENT LINKS > SigmaTron International, Inc. Terms and Conditions of Sale © 2021 SigmaTron International, Inc. All rights reserved. ABOUT CUSTOMER CENTER SUPPLIER CENTER QUALITY INVESTORS CONTACT

SCORE™ ABOUT CUSTOMER CENTER SUPPLIER CENTER QUALITY INVESTORS CONTACT NPI Comprehensive Support for Every Product Launch At SigmaTron International, we do not see new product introduction (NPI) as a phased learning curve. Instead we see it as our opportunity to put the processes in place that ensure production meets your requirements. Our NPI services include prototyping and/or short-run production associated with longer term business, and project launch activities supporting volume production. Prototyping Production Capabilities Consigned or turnkey Quick-turn service (1-3 days) Standard service (3-5 days) Timely quote and buy process Dedicated NPI lines and process team Pre-volume materials management Testing options with minimal programming/tooling cost: – AOI – Flying probe5DX x-ray Project Launch Support Documentation validation Product improvement recommendations (DFM/DFT) Industrial/process engineering Production qualification process tailored to customer requirements © 2021 SigmaTron International, Inc. All rights reserved. ABOUT CUSTOMER CENTER SUPPLIER CENTER QUALITY INVESTORS CONTACT