Other Events. On August 10, 2026, Sunstone Hotel Investors, Inc. (the “Company”) and Sunstone Hotel Partnership, LLC (the “Operating Partnership”) entered into an equity distribution agreement (the “Equity Distribution Agreement”) with each of BofA Securities, Inc., BTIG, LLC, Cantor Fitzgerald & Co., Capital One Securities, Inc., Huntington Securities, Inc., Jefferies LLC, J.P. Morgan Securities LLC, M&T Securities, Inc., Regions Securities LLC, Truist Securities, Inc. and Wells Fargo Securi…

Results of Operations and Financial Condition. ​ On August 6, 2026, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the second quarter ended June 30, 2026. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respectively,…

Results of Operations and Financial Condition. ​ On May 5, 2026, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the first quarter ended March 31, 2026. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respectively, an…

General Counsel and Secretary — David Klein: The position of General Counsel was eliminated, leading to David Klein's departure.

Results of Operations and Financial Condition. ​ On February 27, 2026, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the fourth quarter and year ended December 31, 2025. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.…

Director — Michael Barnello: The filing discloses the election of a new independent director to the board, which is a routine governance event and not a departure of a senior executive.

Results of Operations and Financial Condition. ​ On November 7, 2025, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the third quarter ended September 30, 2025. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respect…

Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant. ​ The information set forth under

Entry Into a Material Definitive Agreement. ​ On September 24, 2025, Sunstone Hotel Investors, Inc. (the “Company”) entered into a Third Amended and Restated Credit Agreement (the “Amended Credit Agreement”) by and among the Company; Sunstone Hotel Partnership, LLC; the lenders party thereto; Wells Fargo Bank, National Association, as administrative agent; Wells Fargo Securities, LLC, BofA Securities, Inc., JPMorgan Chase Bank, N.A., PNC Capital Markets LLC, U.S. Bank National Association, Tr…

Regulation FD Disclosure. ​ On September 25, 2025, the Company issued a press release announcing the closing of the Third Amended and Restated Credit Agreement. A copy of that press release is furnished as Exhibit 99.1 to this report. The press release has also been posted in the investor relations section of the Company’s website at www.sunstonehotels.com. ​ The information contained in the press release attached as Exhibit 99.1 to this report shall not be deemed “filed” for the purposes of…

Results of Operations and Financial Condition. ​ On August 6, 2025, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the second quarter ended June 30, 2025. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respectively,…

Results of Operations and Financial Condition. ​ On May 6, 2025, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the first quarter ended March 31, 2025. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respectively, an…

CEO — Bryan A. Giglia: The filing discloses amendments to employment agreements regarding bonus percentages, which is a compensation matter rather than a change in management personnel.

Results of Operations and Financial Condition. ​ On February 21, 2025, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the fourth quarter and year ended December 31, 2024. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.…

Chief Operating Officer — Chris Ostapovicz: The Chief Operating Officer is departing as part of a restructuring that eliminates the position, with responsibilities absorbed by existing executives and a transition period provided.

Results of Operations and Financial Condition. ​ On November 12, 2024, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the third quarter ended September 30, 2024. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respec…

Entry into a Material Definitive Agreement. ​ On November 7, 2024, Sunstone Hotel Investors, Inc. (the “Company”) entered into a Term Loan Agreement (the “Term Loan Agreement”) among the Company, Sunstone Hotel Partnership, LLC, Wells Fargo Bank, National Association, Bank of America, N.A., JPMorgan Chase Bank, N.A., Truist Bank, U.S. Bank National Association, Huntington Bank, PNC Bank, National Association, Regions Bank, and Bank of Hawaii. ​ The Term Loan Agreement provides for a $100 mill…

Results of Operations and Financial Condition. ​ On October 10, 2024, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release providing a preliminary update on its third quarter 2024 operations. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. ​ The information furnished pursuant to this Item 2.02, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amende…

Results of Operations and Financial Condition. ​ On August 7, 2024, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the second quarter ended June 30, 2024. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respectively,…

Results of Operations and Financial Condition. ​ On May 6, 2024, Sunstone Hotel Investors, Inc. (the “Company”) issued a press release regarding its financial results for the first quarter ended March 31, 2024. The press release referred to supplemental financial information that is available on the Company’s website, free of charge, at www.sunstonehotels.com. A copy of the press release and the supplemental financial information are attached hereto as Exhibits 99.1 and 99.2, respectively, an…