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 March 31, 2019 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 Delaware 94-3263974 (Address of Principal Executive Offices) (State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Identification No.) 1440 Chapin Avenue, Suite 310 Burlingame, California 94010 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURI ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 ☐ 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: 001-13387 AeroCentury Corp. (Exact name of Registrant as Specified in Its Charter) Delaware 94-3263974 (State or Ot ...