Exhibit 99.1

PRESS RELEASE

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ALLIANCE RESOURCE PARTNERS, L.P.

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Reports Second Quarter Financial and Operating Results; Declares Quarterly Cash Distribution of $0.60 Per Unit; and Updates 2026 Guidance

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2026 Quarter Highlights

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TULSA, OKLAHOMA, July 27, 2026 — Alliance Resource Partners, L.P. (NASDAQ: ARLP) (“we,” “us,” “our,” “ARLP” or the “Partnership”) today reported financial and operating results for the three and six months ended June 30, 2026 (the “2026 Quarter” and “2026 Period,” respectively). This release includes comparisons of results to the three and six months ended June 30, 2025 (the “2025 Quarter” and “2025 Period,” respectively) and to the quarter ended March 31, 2026 (the “Sequential Quarter”). All references in the text of this release to “net income” refer to “net income attributable to ARLP.” For a definition of Distributable Cash Flow, Distribution Coverage Ratio, EBITDA, Adjusted EBITDA and Segment Adjusted EBITDA Expense and related reconciliations to comparable GAAP financial measures, please see the end of this release.

For the 2026 Quarter, net income increased 33.9% to $79.6 million, or $0.61 per basic and diluted limited partner unit, compared to $59.4 million, or $0.46 per basic and diluted limited partner unit for the 2025 Quarter primarily as a result of higher total revenues and equity method investment income, and the impact of an impairment loss taken in the 2025 Quarter on a preferred equity investment. Total revenues increased to $551.6 million in the 2026 Quarter compared to $547.5 million for the 2025 Quarter as a result of record oil & gas royalty revenues, increased coal sales volumes and higher other revenues, partially offset by lower coal sales price per ton. Adjusted EBITDA increased 14.7% to $185.7 million in the 2026 Quarter compared to $161.9 million in the 2025 Quarter.

Compared to the Sequential Quarter, total revenues increased 6.9% due to higher coal sales volumes, which rose 8.9% to 8.6 million tons sold in the 2026 Quarter compared to 7.9 million tons sold in the Sequential Quarter, partially offset by 2.7% lower coal sales prices per ton. Net income increased by $70.5 million compared to the Sequential Quarter driven by higher revenues, increased investment income, a smaller decline in the fair value of our digital assets, and a $37.8 million non-cash asset impairment charge in the Sequential Quarter at our Mettiki mine. Adjusted EBITDA for the 2026 Quarter increased by 19.8% compared to the Sequential Quarter.

Total revenues decreased slightly to $1.07 billion for the 2026 Period compared to $1.09 billion for the 2025 Period primarily due to lower coal sales, partially offset by record oil & gas royalty revenues. Net income for the 2026 Period was $88.7 million, or $0.68 per basic and diluted limited partner unit, compared to $133.4 million, or $1.03 per basic and diluted limited partner unit, for the 2025 Period. Adjusted EBITDA for the 2026 Period increased 5.8% to $340.7 million compared to $321.9 million for the 2025 Period.

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CEO Commentary

"Our coal operations performed well during the quarter, highlighted by strong productivity and disciplined cost control," said Joseph W. Craft III, Chairman, President and Chief Executive Officer. "River View and Tunnel Ridge generated superior operating results, driving Segment Adjusted EBITDA expense per ton sold lower by 6.3% year-over-year and 6.6% sequentially. With Hamilton recently returning to longwall production and no additional longwall moves expected until 2027, we believe our operations are well-positioned to meaningfully increase production and cash flow generation during the second half of this year."

Mr. Craft added, "Our Oil & Gas Royalties segment delivered record quarterly revenue of $46.3 million and Segment Adjusted EBITDA of $38.0 million, driven by stronger realized commodity pricing. Subsequent to quarter end, we successfully closed the $206.2 million AllDale III & IV acquisition. With this transaction, our cumulative investment in oil & gas royalties now exceeds $1.0 billion, marking a significant milestone in the evolution of ARLP's diversified natural resource platform."

Mr. Craft continued, "Repeating my comments when we announced our agreement to buy these reserves, this acquisition accelerates the continued growth of our Oil & Gas Royalties segment, adding scale and development upside across multiple U.S. basins, anchored by a meaningful Permian position. It also expands our natural gas footprint with entry into the Haynesville, a resource play well-positioned to benefit from long-term LNG export demand growth. We believe this acquisition will be immediately accretive to ARLP’s free cash flow per unit and strengthens ARLP’s long-term royalty platform, broadens our exposure to high-quality operators and advances our long-term strategy of building a durable, cash-generating royalties business that complements our existing coal operations."

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Segment Results and Analysis (Unaudited)

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Coal Operations

Coal sales volumes decreased by 4.5% in the Illinois Basin compared to the 2025 Quarter due primarily to decreased tons sold from our Hamilton mine as a result of a planned extended longwall move during the 2026 Quarter, partially offset by a strong sales performance and productivity at our River View complex. Compared to the Sequential Quarter, tons sold increased by 4.9% driven primarily by River View's strong performance during the 2026 Quarter. In Appalachia, tons sold increased by 27.6% and 22.3% compared to the 2025 Quarter and Sequential Quarter, respectively, primarily as a result of increased production at our Tunnel Ridge longwall operation due to improved recoveries and higher productivity. Coal sales price per ton decreased by 22.9% and 14.7% in Appalachia compared to the 2025 Quarter and Sequential Quarter, respectively, primarily due to an increased sales mix of lower priced Tunnel Ridge sales volumes in the 2026 Quarter and reduced sales price per ton at Mettiki. ARLP ended the 2026 Quarter with total coal inventory of 0.8 million tons, representing a decrease of 0.3 million tons compared to the end of both the 2025 Quarter and Sequential Quarter.

Segment Adjusted EBITDA Expense per ton in the Illinois Basin increased 3.7% and 2.2% compared to the 2025 Quarter and Sequential Quarter, respectively, due primarily to the planned extended longwall move at our Hamilton mine during the 2026 Quarter. In Appalachia, Segment Adjusted EBITDA Expense per ton for the 2026 Quarter decreased by 29.7% and 25.7% compared to the 2025 Quarter and Sequential Quarter, respectively, as a result of increased production at our Tunnel Ridge operation.

Royalties

Segment Adjusted EBITDA for the Oil & Gas Royalties segment increased to a record $38.0 million in the 2026 Quarter compared to $29.9 million and $34.6 million in the 2025 Quarter and Sequential Quarter, respectively, primarily due to higher average sales prices per MBOE, which increased 22.7% and 22.1%, respectively, partially offset by higher expenses. Oil & gas royalty volumes increased 6.4% compared to the 2025 Quarter as a result of increased drilling and completion activities on our acreage combined with additional oil & gas mineral interests acquired. Volumes decreased 8.4% sequentially due to natural decline from high-ownership pads completed in the Sequential Quarter.

Segment Adjusted EBITDA for the Coal Royalties segment increased to $13.0 million in the 2026 Quarter compared to $11.8 million and $12.3 million in the 2025 Quarter and Sequential Quarter, respectively, due to higher royalty tons sold, primarily from Tunnel Ridge and River View, partially offset by higher expenses.

Balance Sheet and Liquidity

As of June 30, 2026, total debt and finance leases were outstanding in the amount of $590.2 million. The Partnership’s total and net leverage ratios were 0.82 times and 0.67 times debt to trailing twelve months Adjusted EBITDA, respectively, as of June 30, 2026. ARLP ended the 2026 Quarter with total liquidity of $424.0 million, which included $111.2 million of cash and cash equivalents and $312.8 million of borrowings available under its revolving credit and accounts receivable securitization facilities. In addition, ARLP held 646 bitcoins valued at $37.9 million as of June 30, 2026.

Distributions

ARLP announced today that the Board of Directors of ARLP’s general partner approved a cash distribution to unitholders for the 2026 Quarter of $0.60 per unit (an annualized rate of $2.40 per unit), payable on August 14, 2026, to all unitholders of record as of the close of trading on August 7, 2026. The Distribution Coverage Ratio for the 2026 Quarter was 1.39x.

Concurrent with this announcement, we are providing qualified notice to brokers and nominees that hold ARLP units on behalf of non-U.S. investors under Treasury Regulation Section 1.1446-4(b) and (d) and Treasury Regulation Section 1.1446(f)-4(c)(2)(iii). Brokers and nominees should treat one hundred percent (100%) of ARLP’s distributions to non-U.S. investors as being attributable to income that is effectively connected with a United States trade or business. In addition, brokers and nominees should treat one hundred percent (100%) of the distribution as being in excess of cumulative net income for purposes of determining the amount to withhold. Accordingly, ARLP’s distributions to non-U.S. investors are subject to federal income tax withholding at a rate equal to the highest applicable effective tax rate plus ten percent (10%). Nominees, and not ARLP, are treated as the withholding agents responsible for withholding on the distributions received by them on behalf of non-U.S. investors.

July 2026 Acquisition of Oil & Gas Royalties

On July 1, 2026, we completed the previously announced acquisition of certain general partner and limited partner interests in AllDale Minerals III, LP and AllDale Minerals IV, LP (collectively “AllDale III & IV”) for approximately $206.2 million, subject to customary post-closing adjustments. The AllDale III & IV acquisition expands and diversifies our portfolio of mineral and royalty interests through the added control of approximately 48,500 net royalty acres across premier basins and resource plays including the Permian, Anadarko, Bakken and Haynesville.

ARLP funded the acquisition using a combination of cash on hand, borrowings under its revolving credit facility, and a new $150.0 million term loan at its wholly owned subsidiary Alliance Minerals, LLC.

Outlook

"Due to our strong contracted sales book, we were minimally impacted this quarter by lower domestic coal demand in the first half of this year due to mild weather and lower natural gas prices," Mr. Craft continued. "During the quarter, we continued to add to our sales book by securing an additional 21.2 million committed and priced coal sales tons over the 2026 to 2031 time period. Our expected 2026 coal sales tons are essentially fully committed at the midpoint of guidance, and we now have 29.4 million tons committed and priced for 2027 delivery. We believe this level of forward commitment reflects both the strategic importance of our coal supply and the confidence customers place in ARLP’s ability to deliver."

Mr. Craft concluded, "We are increasing our full-year oil & gas royalties volume guidance to reflect the contribution of the AllDale III & IV acquisition beginning in the third quarter of 2026. Similar to our coal segment, we believe our Oil & Gas Royalties segment is well-positioned to meaningfully increase production and cash flow generation during the second half of this year. Looking ahead, our strategy within this segment is focused on reducing leverage, maintaining financial flexibility, and pursuing disciplined acquisition opportunities that enhance long-term unitholder value."

Guidance

ARLP is updating the following guidance for the full year ending December 31, 2026:

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Derivatives

As of the date of this press release, ARLP had the following outstanding derivative contracts assumed in connection with the AllDale III & IV acquisition. When aggregating multiple contracts, the weighted average contract price is disclosed.

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Conference Call

A conference call regarding ARLP’s 2026 Quarter financial results and updated 2026 guidance is scheduled for today at 10:00 a.m. Eastern. To participate in the conference call, dial (877) 407-0784 and request to be connected to the Alliance Resource Partners, L.P. earnings conference call. International callers should dial (201) 689-8560 and request to be connected to the same call. Investors may also listen to the call via the “Investors” section of ARLP’s website at www.arlp.com.

An audio replay of the conference call will be available for approximately one week. To access the audio replay, dial U.S. Toll Free (844) 512-2921; International Toll (412) 317-6671 and request to be connected to replay using access code 13761715.

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About Alliance Resource Partners, L.P.

ARLP is a diversified natural resource company that is currently the second largest coal producer in the eastern United States, supplying reliable, affordable energy domestically and internationally to major utilities, metallurgical and industrial users. ARLP also generates operating and royalty income from mineral interests it owns in strategic coal and oil & gas producing regions in the United States. In addition, ARLP is positioning itself as a reliable energy partner for the future by pursuing opportunities that support the growth and development of energy-related technologies and infrastructure.

News, unit prices and additional information about ARLP, including filings with the Securities and Exchange Commission (“SEC”), are available at www.arlp.com. For more information, contact the investor relations department of ARLP at (918) 295-7673 or via e-mail at investorrelations@arlp.com.

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Investor Relations Contact

Cary P. Marshall

Senior Vice President and Chief Financial Officer

918-295-7673

investorrelations@arlp.com

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The statements and projections used throughout this release are based on current expectations. These statements and projections are forward-looking, and actual results may differ materially. These projections do not include the potential impact of any mergers, acquisitions or other business combinations that may occur after the date of this release. We have included more information below regarding business risks that could affect our results.

FORWARD-LOOKING STATEMENTS: With the exception of historical matters, any matters discussed in this press release are forward-looking statements that involve risks and uncertainties that could cause actual results to differ materially from projected results. Those forward-looking statements include expectations with respect to our future financial and operational performance, coal and oil & gas consumption and expected future prices, our ability to increase or maintain unitholder distributions in future quarters, business plans and potential growth with respect to our energy and infrastructure investments, optimizing cash flows, reducing operating and capital expenditures, infrastructure projects at our existing properties, growth in domestic electricity demand, preserving liquidity and maintaining financial flexibility, and our future repurchases of units. These risks to our ability to achieve these outcomes include, but are not limited to, the following: decline in the coal industry’s share of electricity generation, including as a result of environmental concerns related to coal mining and combustion, the cost and perceived benefits of other sources of electricity and fuels, such as oil & gas, nuclear energy, and renewable fuels and the retirement of coal-fired power plants in the U.S.; our ability to provide fuel for growth in domestic energy demand, should it materialize; changes in macroeconomic and market conditions and market volatility, and the impact of such changes and volatility on our financial position; changes in global economic and geo-political conditions or changes in industries in which our customers operate; changes in commodity prices, demand and availability which could affect our operating results and cash flows; impacts of geopolitical events, including the conflicts in Ukraine and in the Middle East, including Iran and disruption of maritime traffic through the Strait of Hormuz; actions of the major oil-producing countries with respect to oil production volumes and prices and the direct and indirect impacts over the near and long term on oil & gas exploration and production operations at the properties in which we hold mineral interests; changes in competition in domestic and international coal markets and our ability to respond to such changes; potential shut-ins of production by the operators of the properties in which we hold oil & gas mineral interests due to low commodity prices or the lack of downstream demand or storage capacity; risks associated with the expansion of and investments into the infrastructure of our operations and properties, including the timing of such investments coming online; our ability to identify and complete acquisitions and to successfully integrate such acquisitions into our business and achieve the anticipated benefits therefrom; our ability to identify and invest in new energy and infrastructure ventures; the success of our development and growth plans for our wholly owned subsidiary, Matrix Design Group, LLC, and our investments in emerging and other infrastructure and technology companies; dependence on significant customer contracts, and failure of customers to renew existing contracts upon expiration; adjustments made in price, volume, or terms to existing coal supply agreements; the effects of and changes in trade, monetary and fiscal policies and laws, and the results of central bank policy actions including interest rates, bank failures, and associated liquidity risks; the effects of and changes in taxes or tariffs and other trade measures adopted or threatened by the United States and foreign governments, including the imposition of or increase in tariffs on steel and/or other raw materials; legislation, regulations, and court decisions and interpretations thereof, both domestic and foreign, including those relating to the environment and the release of greenhouse gases, such as state legislation

seeking to impose liability on a wide range of energy companies under greenhouse gas “superfund” laws, mining, miner health and safety, hydraulic fracturing, and health care; deregulation of the electric utility industry or the effects of any adverse change in the coal industry, electric utility industry, or general economic conditions; investors’ and other stakeholders’ attention to sustainability matters; liquidity constraints, including those resulting from any future unavailability of financing; customer bankruptcies, cancellations or breaches to existing contracts, or other failures to perform; customer delays, failure to take coal under contracts or defaults in making payments; our productivity levels and margins earned on our coal sales; disruptions to oil & gas exploration and production operations at the properties in which we hold mineral interests; changes in equipment, raw material, service or labor costs or availability, including due to inflationary pressures or tariffs; changes in our ability to recruit, hire and maintain labor; our ability to maintain satisfactory relations with our employees; increases in labor costs, including increases in the costs of health insurance, adverse changes in work rules, or cash payments or projections associated with workers’ compensation claims; increases in transportation costs and risk of transportation delays or interruptions; operational interruptions due to geologic, permitting, labor, weather, supply chain shortage of equipment or mine supplies, or other factors; risks associated with major mine-related accidents, mine fires, mine floods or other interruptions; results of litigation, including claims not yet asserted; foreign currency fluctuations that could adversely affect the competitiveness of our coal abroad; difficulty maintaining our surety bonds for mine reclamation as well as workers’ compensation and black lung benefits; difficulty in making accurate assumptions and projections regarding post-mine reclamation as well as pension, black lung benefits, and other post-retirement benefit liabilities; uncertainties in estimating and replacing our coal mineral reserves and resources; uncertainties in estimating and replacing our oil & gas reserves; uncertainties in the amount of oil & gas production due to the level of drilling and completion activity by the operators of our oil & gas properties; the impact of current and potential changes to federal or state tax rules and regulations, including a loss or reduction of benefits from certain tax deductions and credits; difficulty obtaining commercial property insurance, and risks associated with our participation in the commercial insurance property program; evolving cybersecurity risks, such as those involving unauthorized access, denial-of-service attacks, malicious software, data privacy breaches by employees, insiders or others with authorized access, cyber or phishing attacks, ransomware, malware, social engineering, physical breaches, or other actions; and difficulty in making accurate assumptions and projections regarding future revenues and costs associated with equity investments in companies we do not control.

Additional information concerning these, and other factors can be found in ARLP’s public periodic filings with the SEC, including ARLP’s Annual Report on Form 10-K for the year ended December 31, 2025, filed on February 26, 2026, and ARLP’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, filed on May 8, 2026. Except as required by applicable securities laws, ARLP does not intend to update its forward-looking statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND OPERATING DATA

(In thousands, except unit and per unit data)

(Unaudited)

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

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CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except unit data)

(Unaudited)

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

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Reconciliation of Non-GAAP Financial Measures (Unaudited)

Reconciliation of GAAP “net income attributable to ARLP” to non-GAAP “EBITDA,” “Adjusted EBITDA,”  “Distribution Coverage Ratio” and “Distributable Cash Flow” (in thousands).

EBITDA is defined as net income attributable to ARLP before net interest expense, income taxes and depreciation, depletion and amortization and Adjusted EBITDA is EBITDA adjusted for certain items that we characterize as unrepresentative of our ongoing operations.  Distributable cash flow (“DCF”) is defined as Adjusted EBITDA excluding equity method investment earnings, interest expense (before capitalized interest), interest income, income taxes and estimated maintenance capital expenditures and adding distributions from equity method investments.  Distribution coverage ratio (“DCR”) is defined as DCF divided by distributions paid to partners.  

Management believes that the presentation of such additional financial measures provides useful information to investors regarding our performance and results of operations because these measures, when used in conjunction with related GAAP financial measures, (i) provide additional information about our core operating performance and ability to generate and distribute cash flow, (ii) provide investors with the financial analytical framework upon which management bases financial, operational, compensation and planning decisions and (iii) present measurements that investors, rating agencies and debt holders have indicated are useful in assessing us and our results of operations.

EBITDA, Adjusted EBITDA, DCF and DCR should not be considered as alternatives to net income attributable to ARLP, net income, income from operations, cash flows from operating activities or any other measure of financial performance presented in accordance with GAAP.  EBITDA and DCF are not intended to represent cash flow and do not represent the measure of cash available for distribution.  Our method of computing EBITDA, Adjusted EBITDA, DCF and DCR may not be the same method used to compute similar measures reported by other companies, or EBITDA, Adjusted EBITDA, DCF and DCR may be computed differently by us in different contexts (i.e., public reporting versus computation under financing agreements).

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