Item 4 — Purpose of Transaction
The Reporting Persons are filing this Amendment No. 3 to Schedule 13D ("Amendment No. 3") to amend and supplement the Statement of Beneficial Ownership on Schedule 13D originally filed by the Reporting Persons with the SEC on July 6, 2021 (the "Original Schedule 13D"), as amended by Amendment No. 1 filed with the SEC on January 29, 2024 ("Amendment No. 1"), and as further amended by Amendment No. 2 filed with the SEC on June 25, 2024 ("Amendment No. 2"), with respect to the common stock of the Issuer. This Amendment No. 3 is being filed in order to report changes in the Reporting Persons' beneficial ownership percentages resulting from: (i) the additional warrant amendment agreement, dated March 10, 2026 (described below); (ii) the 1-for-25 reverse stock split of the common stock effective March 6, 2026; and (iii) the Issuer's Nasdaq uplisting and public offering, which closed on May 18, 2026. The securities described in this Amendment No. 3 were acquired for investment purposes. The Reporting Persons intend to review their investments in the Issuer on a continuing basis. Any actions the Reporting Persons might undertake may be made at any time and from time to time without prior notice and will be dependent upon the Reporting Persons' review of numerous factors, including, but not limited to: an ongoing evaluation of the Issuer's business, financial condition, operations and prospects; price levels of the Issuer's securities; general market, industry and economic conditions; the relative attractiveness of alternative business and investment opportunities; and other future developments. Depending upon the factors discussed herein and subject to applicable law, the Reporting Persons may from time to time acquire additional securities of the Issuer in the open market or in privately negotiated transactions and/or exercise warrants for underlying shares of common stock, or sell or otherwise dispose of some or all of their securities of the Issuer. Warrant Amendment Agreement -- March 10, 2026 On March 10, 2026, each of MPF, MCI LP and Yosef Levy entered into an additional Warrant Amendment Agreement with the Issuer (each, a "2026 Warrant Amendment Agreement"), pursuant to which the expiration date of the exercise term of the warrants held by them was further extended from May 11, 2026 to May 1, 2031. The exercise price of the warrants ($16.25 per share, which reflects the existing exercise price, as adjusted to reflect the recent Reverse Stock Split) and the beneficial ownership blocker limiting exercise such that, after giving effect to such exercise, the holder will beneficially own not more than 19.99% of the Issuer's common stock, each as previously described in Amendment No. 2, remain in effect. The foregoing description of the 2026 Warrant Amendment Agreement is not complete and is subject to and qualified in its entirety by reference to the full text of such agreement, which serves as Exhibit 23 hereto and which is incorporated herein by reference. Reverse Stock Split On March 4, 2026, the Issuer filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation in Nevada to effect a 1-for-25 reverse stock split, which became effective on March 6, 2026 (the "Reverse Stock Split"). Following the effectiveness of the Reverse Stock Split, the Issuer's outstanding shares of common stock, stock options, warrants and other equity-based instruments were adjusted to reflect the Reverse Stock Split, as applicable. The Reverse Stock Split was a technical corporate action and did not affect the Reporting Persons' beneficial ownership percentages; however, the number of shares of common stock and warrants beneficially owned by the Reporting Persons was adjusted proportionately as a result thereof. All share and warrant quantities reported in this Amendment No. 3 reflect the Reverse Stock Split. Nasdaq Uplisting and Public Offering On May 14, 2026, the Issuer entered into an underwriting agreement with Maxim Group LLC, as representative of the underwriters, in connection with a public offering of units consisting of shares of common stock and warrants. In connection therewith, the Issuer's common stock and warrants were approved for listing on the Nasdaq Capital Market and commenced trading under the symbols "DUKR" and "DUKRW," respectively. The offering closed on May 18, 2026 and resulted in an increase in the Issuer's issued and outstanding share capital. Such increase caused a material change in the Reporting Persons' beneficial ownership percentages relative to the percentages most recently reported in Amendment No. 2. Other than as described above, the Reporting Persons do not currently have any plans or proposals that relate to, or would result in, any of the matters listed in Items 4(a)-(j) of Schedule 13D, although, depending on the factors discussed herein, the Reporting Persons may change their purpose or formulate different plans or proposals with respect thereto at any time.