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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) Annual Report Under Section 13 Or 15 ( d ) Of The Securities Exchange Act Of 1934 For the fiscal year ended December 31 , 2020 or Transition Report Under Section 13 Or 15 ( d ) Of The Securities Exchange Act of 1934 For the transition period from to Delaware COMMISSION FILE NUMBER : 000-52446 ACTINIUM PHARMACEUTICALS , INC . ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) Title of each class Common stock , par value $ 0.001 275 Madison Avenue , 7th Fl . New York , NY 10016 ( Address of principal executive offices ) ( Zip Code ) ( 646 ) 677-3870 Registrant's telephone number , including area code 74-2963609 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ATNM Name of exchange on which registered NYSE American 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 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 Date File required to be submitted pursuant to Rule 405 of Regulation S - T ( Section 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 ☐ ☑ Accelerated filer Smaller reporting company Emerging growth company ☐ ☑ ப 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 is a shell company ( as defined in Rule 12b - 2 of the act ) : Yes □ No The aggregate market value of voting stock held by nonaffiliates of the registrant as of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , based on the closing price of the common stock on the NYSE AMERICAN on June 30 , 2020 was $ 138,896,884 . As of March 31 , 2021 , 19,245,638 shares of common stock , $ 0.001 par value per share , were outstanding .