Alliance Resource Partners LP

Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 2.03 of this Current Report on Form 8-K. ​ ITEM 7.01. REGULATION FD DISCLOSURE.

​ On July 2, 2026, the Partnership issued a press release announcing the closing of the Acquisition. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. ​ The information furnished in this Item 7.01, including Exhibit 99.1 hereto, shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section nor shall such information be deemed incorporated by reference in any filing under the Securities Act or the Exchange Act, except to the extent specifically referenced in any such filings. ​ ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS. ​ (d) Exhibits ​

Exhibit Number Description ​ 99.1 ​ Alliance Resource Partners, L.P. press release dated July 2, 2026. ​ 104 ​ Cover Page Interactive Data File (formatted as inline XBRL).