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( Mark One ) 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 SEPTEMBER 30 , 2021 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 : 814-00736 PENNANTPARK INVESTMENT CORPORATION ( Exact name of registrant as specified in its charter ) MARYLAND ( State or other jurisdiction of incorporation or organization ) 590 Madison Avenue , 15th Floor New York , N.Y. ( Address of principal executive offices ) ( 212 ) 905-1000 ( Registrant's Telephone Number , Including Area Code ) 20-8250744 ( I.R.S. Employer Identification No. ) 10022 ( Zip Code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of Each Class Common Stock , par value $ 0.001 per share 5.50 % Notes due 2024 Trading Symbol ( s ) PNNT PNNTG Name of Each Exchange on Which Registered The Nasdaq Stock Market LLC The Nasdaq Stock Market LLC Yes ☐ No ☑ . 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 Act . 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 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 Non - accelerated filer Emerging growth company ☐ Accelerated filer Smaller reporting 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 common stock held by non - affiliates of the Registrant on March 31 , 2021 based on the closing price on that date of $ 5.58 on The Nasdaq Global Select Market was approximately $ 364 million . For the purposes of calculating the aggregate market value of common stock held by non - affiliates , all directors and executive officers of the Registrant have been treated as affiliates . There were 67,045,105 shares of the Registrant's common stock outstanding as of November 17 , 2021 . Documents Incorporated by Reference : Portions of the Registrant's Proxy Statement relating to the Registrant's 2022 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10 - K are incorporated by reference into Part III of this Report .