(Mark One) ☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year endedDecember 31,2024OR☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF1934For the transition period fromtoCommission file number1-13232(Apartment Investment and Management Company)Commission file number0-56223(Aimco OP L.P.)Apartment Investment and Management Company Aimco OP L.P. (Exact name of registrant as specified in its charter) Maryland(Apartment Investment and ManagementCompany)84-1259577Delaware(Aimco OP L.P.)85-2460835(State or other jurisdiction of(I.R.S. Employerincorporation or organization)Identification No.)4582 South Ulster Street,Suite 1450Denver,Colorado80237(Address of principal executive offices)(Zip Code)Registrant’s telephone number, including area code(303-224-7900)Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark if the registrant is a well-known seasoned issuer, as defined by Rule 405 of the Securities Act. Apartment Investment and Management Company:Yes☒No☐Aimco OP L.P.:Yes☒No☐Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Apartment Investment and Management Company: Yes☐No☒Aimco OP L.P.: 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 tosuch filing requirements for the past 90 days. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required tosubmit such files). Apartment Investment and Management Company: Yes☒No☐Aimco OP L.P.: Yes☒No☐Indicate by check mark whether the registrant 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 “emerginggrowth company” in Rule 12b-2 of the Exchange Act. Apartment Investment and Management Company: Largeacceleratedfiler☒Non-acceleratedfiler☐ Largeacceleratedfiler☐Non-acceleratedfiler☐ Smallerreportingcompany☐Emerginggrowthcompany☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying withany new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. Apartment Investment and Management Company:☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of itsinternal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accountingfirm that prepared or issued its audit report. Apartment Investment and Management Company: Yes☒No☐Aimco OP L.P.: Yes☒No☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant includedin the filing reflect the correction of an error to previously issued financial statements.☐Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Apartment Investment and Management Company: Yes☐No☒ Aimco OP L.P.: Yes☐No☒ The aggregate market value of the voting and non-voting common stock of Apartment Investment and Management Company held by non-affiliates of Apartment Investment and Management Company was approximately $1.1billion based upon the closing price of $8.29 on June 30,2024. As of February 21, 2025, there were141,967,654shares ofClass A common stock ("Common Stock") outstanding. Documents Incorporated by Reference Portions of Apartment Investment and Management Company's definitive proxy statement to be issued in conjunction with Apartment Investmentand Management Company's annual meeting of stockholders to be held June 10, 2025,are incorporated by reference into Part III of this AnnualReport. EXPLANATORY NOTE Apartment Investment and Management Company ("Aimco" or the "Company"), a Marylandcorporation, is a self-administered and self-managed real estate investment trust ("REIT"). OnDecember 15, 2020, Aimco completed the separation of its businesses (the "Separation"), creating two,separate and distinct, pub