UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K/A

Amendment No. 1

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 22, 2025

APARTMENT INVESTMENT AND MANAGEMENT COMPANY

AIMCO OP L.P.

(Exact name of registrant as specified in its charter)

4582 SOUTH ULSTER STREET

SUITE 1450, DENVER, CO 80237

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (833) 373-1300

NOT APPLICABLE

(Former name or Former Address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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 standards provided pursuant to Section 13(a) of the exchange act. ☐

Explanatory Note

As previously disclosed in its Current Report on Form 8-K filed with the Securities and Exchange Commission on December 23, 2025 (the “Original Form 8-K”), on December 22, 2025, Apartment Investment and Management Company (“Aimco”) and Aimco OP L.P. (collectively, the “Company” or “Seller”) completed the sale of the ownership interests in its subsidiaries that own the properties located at 1001 Brickell Bay Drive (“1001 Brickell”) and 1111 Brickell Bay Drive (“The Yacht Club Apartments”) in Miami, Florida (together referred to as the “Brickell Assemblage”) for a gross purchase price of $520 million. The purchaser financed $85 million of the $520 million purchase price with transferable seller financing notes from Aimco.

This Amendment to Current Report on Form 8-K is being filed to amend and supplement the Original Form 8-K, the sole purpose of which is to provide the financial statements and pro forma financial information required by Item 9.01, which were excluded from the Original Form 8-K and are filed as exhibits hereto and are incorporated herein by reference. All other items in the Original Form 8-K remain the same.

Cautionary Statement Regarding Forward-Looking Statements

This Current Report on Form 8-K contains certain forward-looking statements within the meaning of the federal securities laws. Forward-looking statements include all statements that are not historical statements of fact and those regarding our intent, belief, or expectations. Words such as “anticipate(s),” “expect(s),” “intend(s),” “plan(s),” “believe(s),” “may,” “will,” “would,” “could,” “should,” “seek(s),” “forecast(s),” and similar expressions, or the negative of these terms, are intended to identify such forward-looking statements. These statements, including those regarding the timing of asset sales and the timing and amount of capital expected to be returned to stockholders, are not guarantees of future performance, condition or results, and involve a number of known and unknown risks, uncertainties, and assumptions that may affect actual results or outcomes, including changes in market conditions, fluctuations in our stock price, our financial performance, regulatory changes, and general economic conditions. Readers should carefully review Aimco's financial statements and the notes thereto, as well as the section entitled “Risk Factors” in Item 1A of Aimco's Annual Report on Form 10-K for the year ended December 31, 2024 and the section entitled “Risk Factors” in Part II, Item 1A of Aimco’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, as these filings identify and address important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. These forward-looking statements reflect management's judgment as of this date, and Aimco assumes no (and disclaims any) obligation to revise or update them to reflect future events or circumstances.

Item 9.01. Financial Statements and Exhibits.

(b) Pro Forma Financial Information

The following unaudited pro forma financial information of the Company, which reflect the sale of the Company’s interests in the Brickell Assemblage to the Purchaser, are filed as Exhibit 99.1 to this Current Report.

(d) The following exhibits are filed with this report:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.