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X United States SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K Annual Report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 for the fiscal year ended June 30 , 2021 Transition report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 for the transition period from Commission File Number : 001-39375 Pennsylvania ( State or other jurisdiction of incorporation or organization ) 375 Saxonburg Blvd. Saxonburg , PA ( Address of principal executive offices ) II - VI INCORPORATED ( Exact name of registrant as specified in its charter ) Title of each class Common Stock , no par value Series A Mandatory Convertible Preferred Stock , no par value to Trading Symbol ( s ) IIVI Large Accelerated Filer 冈 Non - accelerated filer 25-1214948 ( I.R.S. Employer Identification No. ) Registrant's telephone number , including area code : 724-352-4455 Securities registered pursuant to Section 12 ( b ) of the Act : 16056 ( Zip code ) Name of each exchange on which registered Nasdaq Global Select Market IIVIP Nasdaq Global Select Market Yes No 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 . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange 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 Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , smaller reporting company , or an emerging growth company . See definitions of " large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act : 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 . ooo 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 . »