in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

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

Entry into a Material Definitive Agreement. On September 11, 2026, SI-BONE, Inc. (the “Company”) and BIXBY SPE FINANCE 11, LLC (“Landlord”) entered into the Fourth Amendment to Lease (the “Fourth Lease Amendment”) to the Office Lease Agreement dated as of February 2, 2018, as amended by that certain First Amendment to Lease dated as of April 16, 2018, that certain Second Amendment to Lease dated as of July 18, 2024, and that certain Third Amendment to Lease dated as of June 5, 2026 (collectiv…

Other Events. On August 21, 2026, the Company initiated a voluntary recall of 98 iFuse TORQ implants from specific lots whose tube packaging had been manufactured between May 4, 2026 and May 15, 2026 and which had been distributed to the Company’s field salesforce and its customers. The Company initiated the recall due to the failure of some of the products’ tube packaging to meet acceptance criteria to act as a sterile barrier, potentially compromising product sterility, presenting a risk of…

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

Entry into a Material Definitive Agreement. On June 5, 2026, SI-BONE, Inc. (the “ Company ”) and BIXBY SPE FINANCE 11, LLC (“ Landlord ”) entered into the Third Amendment to Lease (the “ Third Lease Amendment ”) to the Office Lease Agreement (the “ Original Lease ”) dated as of February 2, 2018, as amended by that certain First Amendment to Lease (the “ First Amendment ”) dated as of April 16, 2018 and that certain Second Amendment to Lease (the " Second Amendment ") dated as of July 18, 2024…

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

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

Chief Financial Officer, Chief Operating Officer — Anshul Maheshwari: Mr. Maheshwari was promoted to also serve as Chief Operating Officer.

Entry into a Material Definitive Agreement. On February 20, 2026, SI-BONE, Inc. (the “Company”) and Orchard Commons, LLC (the “Landlord”) entered into a lease agreement (the “Lease”), pursuant to which the Company will lease approximately 50,485 square feet of space located at 88 West Plumeria Drive, San Jose, California 95134 (the “Premises”). The term of the Lease will commence on the earlier of (a) October 1, 2026 and (b) the date of the Company’s commencement of its business operations in…

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

Results of Operations and Financial Condition. On January 12, 2026 , SI-BO NE, Inc. (the "Company") issued a press release (the “Press Release”) announcing preliminary unaudited revenue and cash and equivalents for the fourth quarter and full year 2025. A copy of the Press Release is attached as Exhibit 99.1 to this current report on Form 8-K and is incorporated by reference herein.

Director — Daniel Wolf: Daniel Wolf resigned from the Board of Directors and entered into a consulting agreement with the company.

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

President, Commercial Operations — Anthony Recupero: Mr. Recupero is retiring and transitioning to an advisory role, with Nikolas Kerr succeeding him as Chief Commercial Officer.

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

Results of Operations and Financial Condition. On January 13, 2025 , SI-BO NE, Inc. (the "Company") issued a press release (the “Press Release”) announcing preliminary unaudited revenue and adjusted EBITDA for the fourth quarter and full year 2024. A copy of the Press Release is attached as Exhibit 99.1 to this current report on Form 8-K and is incorporated by reference herein.

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

Director — Daniel Wolf: Elected as a new director of the Company.

in this current report on Form 8-K and the related information in the exhibit attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (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 Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

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

Entry into a Material Definitive Agreement. On July 18, 2024, SI-BONE, Inc. (the “Company”) and BIXBY SPE FINANCE 11, LLC (“Landlord”) entered into the Second Amendment (the “Second Lease Amendment”) to the Office Lease Agreement (the “Original Lease”) dated as of February 2, 2018, as amended by that certain First Amendment to Lease (the “First Amendment”) dated as of April 16, 2018 (collectively, as amended, the “Lease”). The Lease is for 21,848 square feet of office space located at 471 El…

Material Modifications of Rights of Security Holders. The information set forth in