BOSTON OMAHA Corp → Sky Harbour Group Corp SKYH-WT

Item 4 of the Schedule 13D is hereby supplemented as follows: From April 25, 2025 through April 6, 2026, the Reporting Person sold an aggregate of 534,124 shares of Class A Stock at price ranging between $9.05 and $11.99 per share, for total gross proceeds of $5,205,072.59, pursuant to an effective registration statement and under Rule 144 under the Securities Act of 1933, as amended. As a consequence, the Reporting Person's beneficial ownership decreased to 19,059,773 shares of Class A Stock (including the 7,719,779 Warrant Shares). The Reporting Person's beneficial ownership represents 45.56% of the outstanding Class A Stock and 22.72% of the combined voting Common Stock, a decrease primarily caused by such sale by the Reporting Person of 331,500 shares of Class A Stock on April 6, 2026 and additional shares sold during the period from April 25, 2025 through May 30, 2025. A schedule of each such sale transaction by the Reporting Person is attached hereto as Exhibit 4.1.