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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q ( Mark One ) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from FirstEnergy . to Commission File Number 333-21011 Registrant ; State of Incorporation ; Address ; and Telephone Number FIRSTENERGY CORP ( An Ohio Corporation ) 76 South Main Street Akron OH 44308 Telephone ( 800 ) 736-3402 I.R.S. Employer Identification No. 34-1843785 SECURITIES REGISTERED PURSUANT TO SECTION 12 ( b ) OF THE ACT : Title of Each Class Common Stock , $ 0.10 par value Trading Symbol FE Name of Each Exchange on Which Registered New York Stock Exchange 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 ㅁ 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 ☑ Accelerated Filer Non - 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 standard 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 Exchange Act ) . Yes ☐ No ✓ Indicate the number of shares outstanding of each of the issuer's classes of common stock , as of the latest practicable date : CLASS Common Stock , $ 0.10 par value FirstEnergy Website and Other Social Media Sites and Applications OUTSTANDING AS OF JUNE 30 , 2021 544,193,637 FirstEnergy's Annual Reports on Form 10 - K , Quarterly Reports on Form 10 - Q , Current Reports on Form 8 - K , amendments to those reports , and all other documents filed with or furnished to the SEC pursuant to Section 13 ( a ) of the Securities Exchange Act of 1934 are made