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Table of Contents ( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended June 30 , 2021 FORM 10 - K OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ____ to Commission File Number 000-23125 OSISYSTEMS , INC . Delaware ( State or other jurisdiction of incorporation or organization ) 12525 Chadron Avenue , Hawthorne , California ( Address of principal executive offices ) Title of each class Common Stock , $ 0.001 par value OSI SYSTEMS , INC . ( Exact name of registrant as specified in its charter ) Registrant's telephone number , including area code : ( 310 ) 978-0516 Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ( s ) 33-0238801 ( I.R.S. Employer Identification No. ) 90250 ( Zip Code ) Name of each exchange on which registered The Nasdaq Global Select Market OSIS Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes : No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes : No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes : No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes : No Non - accelerated filer Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer > Accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . < Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes : No The aggregate market value of the registrant's voting and non - voting Common Stock held by non - affiliates computed by reference to the price at which the Common Stock was last sold on December 31 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , was $ 1,580,840,328 . For purposes of the foregoing calculation only , executive officers and directors of the registrant have been deemed to be affiliates of the registrant . The number of shares outstanding of the registrant's Common Stock as of August 18 , 2021 was 17,891,795 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive proxy statement relating to the 2021 annual meeting of stockholders are incorporated by reference into Part III . The proxy statement will be filed by the registrant with the Securities and Exchange Commission not later than 120 days after the end of the registrant's fiscal year .