Other Events. On August 19, 2026, Korro Bio, Inc., or Korro, announced a submission to the Australian Alfred Health Human Ethics Committee to initiate a first-in-human Phase 1/2 clinical trial for KRRO-121, a GalNAc-conjugated RNA editing oligonucleotide in development for the potential treatment of hyperammonemia in patients with Urea Cycle Disorders, or UCDs. The purpose of the Phase 1/2 clinical trial for KRRO-121 is to determine the safety and tolerability of escalating doses, evaluate it…

Unregistered Sales of Equity Securities. The information contained in Item 1.01, above, is hereby incorporated by reference. The issuance of the pre-funded warrants was made in reliance upon an exemption from registration pursuant to Section 3(a)(9) of the Securities Act of 1933, as amended.

Entry into a Material Definitive Agreement. On August 5, 2026, Korro Bio, Inc., or Korro, entered into an exchange agreement with entities affiliated with Venrock Healthcare Capital Partners, together VenRock, pursuant to which (i) VenRock agreed to surrender an aggregate of 1,000,000 shares of Korro’s common stock, par value $0.001 per share, for no consideration, to Korro; and (ii) Korro agreed to issue VenRock pre-funded warrants to purchase an aggregate of 1,000,000 shares of its common s…

Results of Operations and Financial Condition. On August 6, 2026, Korro issued a press release announcing its financial results for the quarter ended June 30, 2026. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or o…

Results of Operations and Financial Condition. On May 7, 2026, Korro Bio, Inc. issued a press release announcing its financial results for the quarter ended March 31, 2026. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amend…

Results of Operations and Financial Condition. On March 12, 2026, Korro Bio, Inc. issued a press release announcing its financial results for the year ended December 31, 2025. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as am…

Entry into a Material Definitive Agreement Subscription Agreement On March 9, 2026, Korro Bio, Inc., or Korro, entered into a subscription agreement with a number of institutional accredited investors pursuant to which it agreed to sell and issue in a private placement pursuant to the exemption in Section 4(a)(2) of the Securities Act of 1933, as amended, or the 1933 Act: (i) an aggregate of 4,501,928 shares of its common stock, par value $0.001 per share at a purchase price of $11.11 per sha…

Unregistered Shares of Equity Securities To the extent required by this Item, the information included in

Regulation FD Disclosure On March 9, 2026, Korro issued a press release announcing the private placement, which is attached as Exhibit 99.1 to this current report on Form 8-K and incorporated by reference herein. The information in this Item 7.01, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the 193…

Results of Operations and Financial Condition Korro expects to report that it had cash, cash equivalents and marketable securities of approximately $85.2 million as of December 31, 2025. The estimated cash figure is preliminary and unaudited, represents a management estimate as of the date of this current report on Form 8-K and is subject to completion of Korro’s financial closing procedures. Korro’s independent registered public accounting firm has not conducted an audit or review of, and do…

Jeffrey Cerio: Amended and restated employment agreement with increased compensation and benefits.

Results of Operations and Financial Condition. On November 12, 2025, Korro issued a press release announcing its financial results for the quarter ended September 30, 2025. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amend…

Entry into a Material Definitive Agreement. Effective November 11, 2025, Korro Bio, Inc., or Korro, and Novo Nordisk A/S, or Novo Nordisk, entered into an amendment of that certain research collaboration and license agreement dated September 13, 2024 pursuant to which Korro granted Novo Nordisk an exclusive worldwide license under certain intellectual property rights to research, develop, manufacture, commercialize or otherwise exploit certain licensed compounds and licensed products for an i…

Chief Medical Officer — Olukemi A. Olugemo, M.D., FAAN: Dr. Olugemo resigned to pursue another opportunity.

Costs Associated with Exit or Disposal Activities. On November 12, 2025, Korro implemented a strategic restructuring to extend cash runway, including a workforce reduction of approximately 34%. Korro estimates that it will incur one-time restructuring charges of approximately $2.4 million including employee severance, benefits and related termination costs, the majority of which Korro expects to recognize during the three months ended December 31, 2025. The charges Korro expects to incur in c…

Chief Financial Officer — Vineet Agarwal: Mr. Agarwal resigned to pursue another opportunity.

Results of Operations and Financial Condition. On August 12, 2025, Korro Bio, Inc., or Korro, issued a press release announcing its financial results for the quarter ended June 30, 2025. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of…

Costs Associated with Exit or Disposal Activities. On May 7, 2025, Korro initiated a strategic plan to streamline its operations, including a workforce reduction of approximately 20%. Korro estimates that it will incur one-time restructuring charges of approximately $1.2 million including employee severance, benefits and related termination costs, the majority of which Korro expects to recognize during the three months ended June 30, 2025. The charges Korro expects to incur in connection with…

Results of Operations and Financial Condition. On May 7, 2025, Korro Bio, Inc., or Korro, issued a press release announcing its financial results for the quarter ended March 31, 2025. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 193…

principal accounting officer — Oliver Dolan: Mr. Oliver Dolan was appointed as the Company's principal accounting officer.

Results of Operations and Financial Condition. On March 18, 2025, Korro Bio, Inc. issued a press release announcing its financial results for the year ended December 31, 2024. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or th…

Chief Financial Officer (principal financial officer and principal accounting officer) — Vineet Agarwal: The CFO is taking a temporary medical leave of absence.

Results of Operations and Financial Condition. On November 12, 2024, Korro Bio, Inc. issued a press release announcing its financial results for the quarter ended September 30, 2024. The full text of the press release is being furnished as Exhibit 99.1 to this current report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934…

Entry into a Material Definitive Agreement On September 13, 2024, we entered into a research collaboration and license agreement with Novo Nordisk A/S, or Novo Nordisk, pursuant to which we granted Novo Nordisk an exclusive worldwide license under certain intellectual property rights to research, develop, manufacture, commercialize or otherwise exploit certain licensed compounds and licensed products for an initial target in the cardiometabolic field and for a second target (to be nominated b…

Director — David L. Lucchino: Mr. Lucchino resigned from the Board but will continue to provide strategic advisory services under a consulting agreement.