DeFi Development Corp.

Item 8.01. Other Events. On September 21, 2026, DeFi Development Corp. (“DFDV” or the “Company”) announced that during the period from September 14, 2026 through September 18, 2026, DFDV grew its SOL and SOL Equivalents by 101,381. The Company reported the following information as of the dates indicated below: September 11, 2026 September 18, 2026 % Change ───────────────────────────────────────────────────────────────────────────────────────── SOL and SOL equivalents 2,388,923 2,490,304 4% The Company expects SOL held in treasury to be deployed through its staking, validator and onchain treasury infrastructure, subject to market conditions and risk management considerations. On September 21, 2026, the Company also issued a press release announcing, among other matters, the closing of R.F. Lafferty & Co., Inc.'s exercise of its over-allotment option in connection with the initial public offering of the Company's Variable Rate Series C Perpetual Preferred Stock. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. Cautionary Note Regarding Forward-Looking Statements. This Form 8-K and the exhibits attached hereto contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on the Company’s current assumptions, expectations and beliefs and are subject to substantial risks, uncertainties, assumptions and changes in circumstances that may cause the Company’s actual results, performance or achievements to differ materially from those expressed or implied in any forward-looking statement. These risks include, but are not limited to, market risks, trends and conditions, and are more fully described in the section captioned “Risk Factors” in the Company’s most recent Annual Report on Form 10-K, subsequent Quarterly Reports on Form 10-Q and other reports the Company files with the SEC.