Results of Operations and Financial Condition On July 29, 2026, Impinj, Inc. issued a press release announcing its financial results for the second quarter ended June 30, 2026. A copy of the press release, entitled “Impinj Reports Second Quarter 2026 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “filed” for purposes…

Results of Operations and Financial Condition On April 29, 2026, Impinj, Inc. (the “Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2026. A copy of the press release, entitled “Impinj Reports First Quarter 2026 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this Current Report on Form 8-K and the exhibit attached hereto shall not be deemed “fil…

Other Events. Between March 11 and 13, 2026, Impinj entered into separate, privately negotiated repurchase agreements with certain holders of its 1.125% Convertible Notes due 2027 (the “Notes”) to repurchase for cash (the “Repurchases”) approximately $40.2 million aggregate principal amount of the Notes for a total repurchase cost (including accrued and unpaid interest) of approximately $47.2 million. Following the closings of the Repurchases, approximately $57.3 million aggregate principal a…

Results of Operations and Financial Conditions On February 5, 2026, Impinj, Inc. issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2025. A copy of the press release, entitled “Impinj Reports Fourth Quarter and Full Year 2025 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall not…

Results of Operations and Financial Condition. On January 13, 2026, Impinj, Inc. (the “Company”) issued a press release announcing certain preliminary unaudited financial information for the fourth quarter ended December 31, 2025. A copy of the press release, entitled “Impinj Announces Preliminary Fourth-Quarter 2025 Revenue and Adjusted EBITDA Ahead of Participation at 28th Annual Needham Growth Conference” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by…

CEO — Chris Diorio: The filing discloses an amendment to the CEO's employment agreement regarding severance terms, not an actual departure, appointment, or election.

by reference. 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. Impinj, Inc. By: /s/ Chris Diorio Chris Diorio Chief Executive Officer Date: October 30, 2025

Entry into a Material Definitive Agreement On October 30, 2025, Impinj, Inc. (the “Company”) entered into a Fifth Amendment to Office Lease (the “Lease Amendment”) with 400 Fairview Avenue LLC (“Landlord”) to amend the Office Lease dated as of December 10, 2014, as amended (the “Lease”) relating to the Company’s office space in Seattle, Washington (the “Premises”). The Lease Amendment extends the term of the Lease to January 31, 2038 and provides the expansion of the Premises by approximately…

Results of Operations and Financial Conditions On October 29, 2025, Impinj, Inc. (the “Company”) issued a press release announcing its financial results for the third quarter ended September 30, 2025. A copy of the press release, entitled “Impinj Reports Third Quarter 2025 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall not be deem…

Director — Arthur L. Valdez Jr.: Appointment of Arthur L. Valdez Jr. as a director.

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. Convertible Notes and the Indenture On September 3, 2025, Impinj, Inc. (the “Company”) priced its private offering of $170 million aggregate principal amount of 0% Convertible Senior Notes due 2029 (the “Notes”). The Notes were issued pursuant to an Indenture, dated September 8, 2025 (the “Indenture”), between the Company and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). The Indenture includes customary covenants and set…

Other Events. Purchase Agreement On September 3, 2025, the Company entered into a purchase agreement (the “Purchase Agreement”) with Jefferies LLC and UBS Securities LLC, as representatives of the several initial purchasers named in Schedule I thereto (the “Initial Purchasers”), to issue and sell the Notes. In addition, pursuant to the terms of the Purchase Agreement, the Company granted the Initial Purchasers an option to purchase, during a 13-day period beginning on, and including, the date…

Unregistered Sales of Equity Securities. The information set forth under Items 1.01 of this Current Report on Form 8-K is incorporated herein by reference. Convertible Notes The Company offered and sold the Notes to the Initial Purchasers in reliance on the exemption from the registration requirements provided by Section 4(a)(2) of the Securities Act, and for resale by the Initial Purchasers to qualified institutional buyers pursuant to the exemption from registration requirements provided by…

Other Events. On September 2, 2025, Impinj, Inc. issued a press release announcing its intention to offer $175 million aggregate principal amount of Convertible Senior Notes due 2029 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Results of Operations and Financial Conditions On July 30, 2025, Impinj, Inc. (the “Company”) issued a press release announcing its financial results for the second quarter ended June 30, 2025. A copy of the press release, entitled “Impinj Reports Second Quarter 2025 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall not be deemed “fi…

COO — Hussein Mecklai: The resignation of the Chief Operating Officer represents the loss of a key senior executive.

Results of Operations and Financial Conditions On April 23, 2025, Impinj, Inc. (the “Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2025. A copy of the press release, entitled “Impinj Reports First Quarter 2025 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall not be deemed “fi…

Chief Revenue Officer — Jeff Dossett: The Chief Revenue Officer is retiring, which is an orderly succession event rather than a sudden loss or shock.

Results of Operations and Financial Conditions On February 5, 2025, Impinj, Inc. (the “Company”) issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2024. A copy of the press release, entitled “Impinj Reports Fourth Quarter and Full Year 2024 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached…

Results of Operations and Financial Condition. On January 14, 2025, Impinj, Inc. (the “Company”) issued a press release announcing certain preliminary unaudited financial information for the fourth quarter ended December 31, 2024. A copy of the press release, entitled “Impinj Reiterates Fourth-Quarter 2024 Revenue and Adjusted EBITDA Guidance Ahead of Participation at 27th Annual Needham Growth Conference” is attached as Exhibit 99.1 to this current report on Form 8-K and is incorporated by r…

Results of Operations and Financial Conditions. On October 23, 2024, Impinj Inc. (“Impinj” or the “Company”) issued a press release announcing its financial results for the third quarter ended September 30, 2024. A copy of the press release, entitled “Impinj Reports Third Quarter 2024 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall…

Results of Operations and Financial Conditions. On July 24, 2024, Impinj Inc. (“Impinj” or the “Company”) issued a press release announcing its financial results for the second quarter ended June 30, 2024. A copy of the press release, entitled “Impinj Reports Second Quarter 2024 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall not b…

Results of Operations and Financial Conditions. On April 24, 2024, Impinj Inc. (“Impinj” or the “Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2024. A copy of the press release, entitled “Impinj Reports First Quarter 2024 Financial Results” is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. The information in this current report on Form 8-K and the exhibit attached hereto shall not b…

Entry into a Material Definitive Agreement. On March 13, 2024, Impinj, Inc. (“Impinj”) and NXP Semiconductors N.V. and its subsidiary NXP USA, Inc. (collectively, “NXP”) entered into a Settlement and Patent Cross-License Agreement dated March 13, 2024 (the “Agreement”), which resolves all outstanding litigation and other proceedings between them. Under the Agreement, Impinj and NXP will terminate and withdraw all pending proceedings and release one another for all patent infringement claims p…