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Commission File Number 1-3525 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - Q × QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Quarterly Period Ended March 31 , 2021 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For The Transition Period from Registrants ; Address and Telephone Number to States of Incorporation New York I.R.S. Employer Identification Nos . AMERICAN ELECTRIC POWER CO INC . AEP TEXAS INC . APPALACHIAN POWER COMPANY 333-221643 333-217143 AEP TRANSMISSION COMPANY , LLC 1-3457 1-3570 1-6543 0-343 1-3146 INDIANA MICHIGAN POWER COMPANY OHIO POWER COMPANY PUBLIC SERVICE COMPANY OF OKLAHOMA SOUTHWESTERN ELECTRIC POWER COMPANY 1 Riverside Plaza , Columbus , Ohio 43215-2373 Telephone ( 614 ) 716-1000 Securities registered pursuant to Section 12 ( b ) of the Act : Registrant American Electric Power Company Inc. American Electric Power Company Inc. American Electric Power Company Inc. Title of each class Common Stock , $ 6.50 par value 6.125 % Corporate Units 6.125 % Corporate Units 13-4922640 Delaware 51-0007707 Delaware 46-1125168 Virginia 54-0124790 Indiana 35-0410455 Ohio 31-4271000 Oklahoma 73-0410895 Delaware 72-0323455 Trading Symbol Name of Each Exchange on Which Registered AEP AEPPL The NASDAQ Stock Market LLC The NASDAQ Stock Market LLC The NASDAQ Stock Market LLC AEPPZ Indicate by check mark whether the registrants ( 1 ) have 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 registrants were required to file such reports ) , and ( 2 ) have been subject to such filing requirements for the past 90 days . Yes X No ☐ Indicate by check mark whether the registrants have 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 registrants were required to submit such files ) . Yes X No ☐ Indicate by check mark whether American Electric Power Company , Inc. 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 . ☐ Non - accelerated filer ☐ Large Accelerated filer X Accelerated filer Smaller reporting company ☐ Emerging growth company ☐ Indicate by check mark whether AEP Texas Inc. , AEP Transmission Company , LLC , Appalachian Power Company , Indiana Michigan Power Company , Ohio Power Company , Public Service Company of Oklahoma and Southwestern Electric Power Company are large accelerated filers , accelerated filers , non - accelerated filers , smaller reporting companies , or emerging growth companies . 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 ☐ Non - accelerated filer X If an emerging growth company , indicate by check mark if the registrants have 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 registrants are shell companies ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes ☐ No x AEP Texas Inc. , AEP Transmission Company , LLC , Appalachian Power Company , Indiana Michigan Power Company , Ohio Power Company , Public Service Company of Oklahoma and Southwestern Electric Power Company meet the conditions set forth in General Instruction H ( 1 ) ( a ) and ( b ) of Form 10 - Q and are therefore filing this Form 10 - Q with the reduced disclosure format specified in General Instruction H ( 2 ) to Form 10 - Q .