Entry into a Material Definitive Agreement. On August 17, 2026, Fastly, Inc. (the “Company”) entered into a Fourth Amendment to Credit Agreement (the “Fourth Amendment”) to its Credit Agreement dated as of February 16, 2021, among the Company, as borrower, the lenders from time to time party thereto, and Silicon Valley Bank, a division of First-Citizens Bank & Trust Company (the “Agent”), as administrative agent, issuing lender, and swingline lender (as amended, restated, supplemented, or mod…

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. FASTLY, INC. Dated: August 17, 2026 By: /s/ Richard Wong Richard Wong Chief Financial Officer

Results of Operations and Financial Condition. On August 5, 2026, Fastly, Inc. (the "Company") announced its financial results for the quarter ended June 30, 2026 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter ended June 30, 2026 (the “Investor Supplement”). The Investor…

principal accounting officer — Jeffrey Ford: Jeffrey Ford was promoted to principal accounting officer from Chief Accounting Officer.

Results of Operations and Financial Condition. On May 6, 2026, Fastly, Inc. (the "Company") announced its financial results for the quarter ended March 31, 2026 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter ended March 31, 2026 (the “Investor Supplement”). The Investor S…

Changes in Registrant’s Certifying Accountant. On March 4, 2026, the Audit Committee (the “Audit Committee”) of the Board of Directors of Fastly, Inc. (the “Company”) approved the appointment of KPMG LLP (“KPMG”), as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026. As of the date of this report, KPMG is in the process of its standard client evaluation procedures and has not accepted the engagement. During the Company’s two most recent f…

Results of Operations and Financial Condition. On February 11, 2026, Fastly, Inc. (the "Company") announced its financial results for the quarter and full year ended December 31, 2025 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter and fiscal year ended December 31, 2025 (…

Creation of a Direct Financial Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth under the heading Option Notes in

Entry into a Material Definitive Agreement. The disclosure set forth under the heading Additional Capped Call Transactions in

Other Events. Option Notes On December 15, 2025, the Company was notified by the initial purchasers (the “Initial Purchasers”) of the 0% Convertible Senior Notes due 2030 (the “Original Notes”) issued in the previously announced private offering, which closed on December 9, 2025, of the exercise in full of their option to purchase an additional $20.0 million in aggregate principal amount of 0% Convertible Senior Notes due 2030 (the “Option Notes,” and together with the Original Notes, the “No…

Unregistered Sales of Equity Securities. The disclosure set forth under the heading Option Notes in

Entry Into a Material Definitive Agreement. Indenture and Notes On December 9, 2025, Fastly, Inc. (the “ Company ”) issued $160,000,000 aggregate principal amount of its 0% Convertible Senior Notes due 2030 (the “ Notes ”). The Notes were issued pursuant to, and are governed by, an indenture (the “ Indenture ”), dated as of December 9, 2025, between the Company and U.S. Bank Trust Company, National Association, as trustee (the “ Trustee ”). Pursuant to the purchase agreement between the Compa…

Other Events. Concurrent Repurchase of 2026 Notes On or about December 9, 2025, the Company used the remaining net proceeds from the offering of the Notes after the funding of the cost of entering into the Base Capped Call Transactions described in Item 1.01, together with cash on hand, to repurchase $150.0 million aggregate principal amount of the Company’s 0% convertible senior notes due 2026 (the “ 2026 Notes ”) for approximately $148.9 million, in privately negotiated transactions. The Co…

Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

The Notes were issued to the initial purchasers in reliance upon Section 4(a)(2) of the Securities Act of 1933, as amended (the “ Securities Act ”), in transactions not involving any public offering. The Notes were resold by the initial purchasers to persons whom the initial purchasers reasonably believe are “qualified institutional buyers,” as defined in, and in accordance with, Rule 144A under the Securities Act. Any shares of the Company’s Class A Common Stock that may be issued upon conve…

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On November 26, 2025, Fastly, Inc. (the “Company”), acting pursuant to authorization from its Board of Directors, provided notice to the New York Stock Exchange (the “NYSE”) that it intends to voluntarily withdraw the listing of its Class A common stock, par value $0.00002 per share (the “common stock”) from the NYSE and transfer the listing of its common stock to the Nasdaq Stock Market LLC (…

Results of Operations and Financial Condition. On November 5, 2025, Fastly, Inc. (the "Company") announced its financial results for the quarter ended September 30, 2025 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter ended September 30, 2025 (the “Investor Supplement”). T…

Chief Financial Officer — Richard Wong: The company hired a new Chief Financial Officer.

Results of Operations and Financial Condition. On August 6, 2025, Fastly, Inc. (the "Company") announced its financial results for the quarter ended June 30, 2025 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter ended June 30, 2025 (the “Investor Supplement”). The Investor…

CEO — Todd Nightingale: Todd Nightingale resigned as CEO and President to pursue another opportunity.

Results of Operations and Financial Condition. On May 7, 2025, Fastly, Inc. (the "Company") announced its financial results for the quarter ended March 31, 2025 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter ended March 31, 2025 (the “Investor Supplement”). The Investor S…

Results of Operations and Financial Condition. On February 12, 2025, Fastly, Inc. (the "Company") announced its financial results for the quarter and full year ended December 31, 2024 by issuing a press release. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Attached hereto as Exhibit 99.2 and incorporated by reference herein is the Company’s investor supplement, regarding results of the quarter and fiscal year ended December 31, 2024 (…

Other Events. On December 2, 2024, Fastly issued a press release announcing that on December 2, 2024, it (i) entered into separate, privately negotiated subscription agreements to issue the 2028 Notes; and (ii) entered into separate, privately negotiated repurchase agreements with a limited number of holders of Fastly’s existing 0.00% Convertible Senior Notes due 2026 (the “2026 Notes”) to repurchase (the “Repurchases”) approximately $157.9 million aggregate principal amount of 2026 Notes for…

Entry into a Material Definitive Agreement. Indenture and Notes On December 5, 2024, Fastly, Inc. (“Fastly”) issued (the “Issuance”) $150.0 million principal amount of its 7.75% convertible senior notes due 2028 (the “2028 Notes”). The 2028 Notes were issued pursuant to an Indenture, dated December 5, 2024 (the “Indenture”), between Fastly and U.S. Bank Trust Company, National Association, as trustee. The 2028 Notes will accrue interest at a rate of 7.75% per annum, payable semi-annually in a…

Unregistered Sales of Equity Securities. The information set forth under