MESA ROYALTY TRUST/TX

STATEMENTS OF DISTRIBUTABLE INCOME

STATEMENTS OF ASSETS, LIABILITIES AND TRUST CORPUS

(The accompanying notes are an integral part of these financial statements.)

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STATEMENTS OF CHANGES IN TRUST CORPUS

(The accompanying notes are an integral part of these financial statements.)

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NOTES TO FINANCIAL STATEMENTS

Note 1 — Trust Organization and Provisions

The Trust, created under the laws of the State of Texas, maintains its offices at the office of the Trustee, The Bank of New York Mellon Trust Company, N.A., (the “Trustee”), 601 Travis Street, Floor 16, Houston, Texas 77002. The telephone number of the Trust is 713-483-6020. The Trust has no employees. Administrative functions of the Trust are performed by the Trustee. The Trustee maintains a website for the Trust that makes available, free of charge, filings by the Trust with the Securities and Exchange Commission (“SEC”) and other information. Any reports filed with the SEC are accessible through the Trust’s website as soon as reasonably practicable after the Trustee electronically files such material with, or furnishes it to, the SEC. The Trust’s website is http://mtr.q4web.com/home/default.aspx.

Trust Corpus Description. The Trust was created on November 1, 1979 and is now governed by the Mesa Royalty Trust Indenture (as amended, the “Trust Indenture”). Through a series of conveyances, assignments, and acquisitions, the Trust currently owns an overriding royalty interest (the “Royalties”) equal to 11.44% of 90% of the Net Proceeds (as defined in the Conveyance and described below) attributable to the specified interest in certain producing oil and gas properties located in the:

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Hugoton field of Kansas (the “Hugoton Royalty Properties”);

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San Juan Basin field of New Mexico (the “San Juan Basin — New Mexico Properties”); and

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San Juan Basin field of Colorado (the “San Juan Basin — Colorado Properties”, and together with the San Juan Basin — New Mexico Properties, the “San Juan Basin Royalty Properties”, and together with the Hugoton Royalty Properties, the “Royalty Properties”).

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Trust Corpus Conveyance History. On November 1, 1979, Mesa Petroleum Co., predecessor to Mesa Limited Partnership (“MLP”), which was the predecessor to MESA Inc., conveyed to the Trust the Royalties equal to 90% of the Net Proceeds (as defined in the Conveyance and described below) attributable to the specified interests in properties conveyed by the assignor on that date (the “Subject Interests”). The Subject Interests consisted of interests in the Royalty Properties described above. The Royalties are evidenced by counterparts of an Overriding Royalty Conveyance, dated November 1, 1979 (the “Conveyance”). In 1985, the Trust Indenture was amended, and the Trust conveyed to an affiliate of Mesa Petroleum Co. 88.5571% of the original Royalties (such transfer, the “1985 Assignment”). The effect of the 1985 Assignment was an overall reduction of approximately 88.56% in the size of the Trust. As a result, the Trust is now entitled to receive 11.44% of 90% of the Net Proceeds attributable to the Royalty Properties each month.

Hugoton Royalty Properties. On November 22, 2019, Riviera Resources, Inc. completed the sale of its interest in its remaining properties located in the Hugoton Basin to Scout Energy Group V, LP (“Scout”). On April 30, 2026, Scout sold their interest in the properties to Jonah Energy LLC into existing joint venture partnerships with Eiger Operating Company (“Eiger”) and Burk Royalty Co (“Burk”). Under terms of the agreement, which is effective as of January 1, 2026, Scout would continue to operate the properties until June 30, 2026. Beginning July 1, 2026 (Q3), Eiger will operate the Hugoton Properties. In this filing on Form 10-Q, we refer to Scout as the operator of the Hugoton Properties for the quarter ended June 30, 2026, and refer to Eiger as the current operator and the operator for future periods.

San Juan Basin — Colorado Properties. The Trust’s interest in the San Juan Basin Royalty Properties was conveyed from a working interest in 31,328 net producing acres in northwestern New Mexico and

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southwestern Colorado. ConocoPhillips sold the portion of its interests in the San Juan Basin — Colorado Properties to MarkWest Energy Partners, Ltd. (effective January 1, 1993) and Red Willow Production Company (“Red Willow”) (effective April 1, 1992). On October 26, 1994, MarkWest Energy Partners, Ltd. sold substantially all of its interest in the San Juan Basin — Colorado Properties to BP Amoco Company (“BP”), a subsidiary of BP p.l.c. On February 28, 2020, BP completed the sale of all of its interest in the San Juan Basin — Colorado Properties to SIMCOE LLC (“Simcoe”), an affiliate of IKAV Energy Inc. BP, under a transition services agreement with Simcoe, operated the properties until December 1, 2020. On September 16, 2025, Mach Natural Resources LP (Mach) completed the purchase of all membership interests of Simcoe, which included the interest in the San Juan Basin — Colorado Properties. Simcoe, now a subsidiary of Mach, and Red Willow currently operate the San Juan Basin — Colorado Properties.

San Juan Basin — New Mexico Properties. Starting from the date of the San Juan Basin Sale and ending on July 31, 2017, ConocoPhillips operated substantially all of the San Juan Basin — New Mexico Properties, except a small number of properties that had been assigned to XTO Energy, Inc. (“XTO”) effective January 1, 2005. On July 31, 2017, ConocoPhillips sold its San Juan Basin assets to Hilcorp San Juan LP (“Hilcorp”), an affiliate of Hilcorp Energy Company. On March 29, 2018, XTO sold to Hilcorp its interests in the San Juan Basin — New Mexico Properties. Hilcorp currently operates all of the San Juan Basin — New Mexico Properties.

As used in this report, Eiger refers to the current operator of the Hugoton Royalty Properties, Hilcorp refers to the current operator of the San Juan Basin — New Mexico Properties, and Simcoe, now a subsidiary of Mach, and Red Willow refer to the current co-operators of certain tracts of land included in the San Juan Basin — Colorado Properties, unless otherwise indicated. Eiger, Mach, Red Willow and Hilcorp are each individually referred to herein as “Working Interest Owner” or collectively as the “Working Interest Owners.”

The Royalty Properties are required to be operated by the Working Interest Owners in accordance with reasonable and prudent business judgment and good oil and gas field practices. Each Working Interest Owner has the right to abandon any well or lease if, in its opinion, such well or lease ceases to produce or is not capable of producing oil, gas or other minerals in commercial quantities. Each Working Interest Owner markets the production based on terms they deem appropriate under the given circumstances. See “Contracts” under Part I, Item 1 of the Trust’s Annual Report on Form 10-K for the year ended December 31, 2025. The Trustee has no power or authority to exercise any control over the operation of the Royalty Properties or the marketing of production therefrom. In addition, the Trust does not undertake or control any capital projects or make capital expenditures related to any of the Royalty Properties.

Trustee and Terms of Trust Indenture. The Trust is a passive entity whose purposes are limited to: (1) converting the Royalties to cash, either by retaining them and collecting the proceeds of production (until production has ceased or the Royalties are otherwise terminated) or by selling or otherwise disposing of the Royalties; and (2) distributing such cash, net of amounts for payments of liabilities to the Trust, to the unitholders. The Trust has no sources of liquidity or capital resources other than the revenues, if any, attributable to the Royalties and interest on cash held by the Trustee as a reserve for liabilities or for distribution. The terms of the Trust, the Trust Indenture and agreements with the Working Interest Owners provide, among other things, that:

(a) the Trust cannot engage in any business or investment activity or purchase any assets;

(b) the Royalties can be sold in part or in total for cash upon approval by the unitholders;

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(c) the Trustee can establish cash reserves, place cash reserves in interest bearing accounts or certificates, and borrow funds to pay liabilities of the Trust and can pledge assets of the Trust to secure payment of the borrowings;

(d) the Trustee will make cash distributions to the unitholders in January, April, July and October each year as discussed more fully in “Note 2 — Basis of Presentation”;

(e) the Trust will terminate upon the first to occur of the following events: (i) at such time as the Trust’s royalty income for two successive years is less than $250,000 per year or (ii) a vote by the unitholders in favor of termination. Upon termination of the Trust, the Trustee will sell for cash all the assets held in the Trust estate and make a final distribution to unitholders of any funds remaining after all Trust liabilities have been satisfied; and

(f) Eiger, Hilcorp, and Simcoe, now a subsidiary of Mach, will reimburse the Trust 59.34%, 27.45% and 1.77%, respectively, for general and administrative expenses of the Trust.

Trustee’s Fees. Pursuant to the Trust Indenture, the Trust pays the Trustee fees for its services each quarter. The net amount of these reimbursements is included in the general and administrative expenses of the Trust. For the quarter ended June 30, 2026, the Trustee was due $118,750 for its services. The Trust paid $108,288 of this amount to the Trustee, and $10,462 was allocated to offset against interest due to the Trust under the Trust Indenture. The Trust Indenture requires that cash being held by the Trustee earn interest at 1.5% below the prime rate, which would have yielded the Trust a 5.25% annualized return from January 1, 2026 through June 30, 2026. However, due to the interest rate environment at the time, the Trustee was unable to obtain an account in which such an interest rate was available. In the event such an interest rate is unavailable in the future, the Trustee intends to allocate certain of its fees due to the Trust to meet the minimum interest rate payable under the Trust Indenture. In future periods, the Trustee will continue to allocate a portion of the fees earned for its services to the Trust until all remaining interest due to the Trust is fully offset.

The Working Interest Owners partially reimburse the Trust each quarter for amounts paid in connection with the Trustee’s services. For the quarter ended June 30, 2026, the Trustee’s fees were $108,288 and the Working Interest Owners reimbursed a sum of $95,897 to the Trustee, which was the same amount reimbursed for the quarter ended June 30, 2025.

Discussion of Net Proceeds. The Conveyance provides for a monthly computation of Net Proceeds. Net Proceeds is defined in the Conveyance as the “Gross Proceeds” received by the Working Interest Owners during a particular period, minus certain production and capital costs for such period. “Gross Proceeds” is defined in the Conveyance as the amount received by the Working Interest Owners from the sale of “Subject Minerals”, subject to certain adjustments. “Subject Minerals” means all oil, gas and other minerals, whether similar or dissimilar, in and under, and which may be produced, saved and sold from, and which accrue and are attributable to, the Subject Interests from and after November 1, 1979. “Production costs” means, generally, costs incurred on an accrual basis by the Working Interest Owners in operating the Royalty Properties, including capital and non-capital costs. If production and capital costs exceed Gross Proceeds for any month, the excess, plus interest thereon at 120% of the prime rate of Bank of America, is recovered out of future Gross Proceeds prior to the making of further payment to the Trust. The Trust, however, is generally not liable for any operating costs or other costs or liabilities attributable to the Royalty Properties or minerals produced therefrom. The Trust is not obligated to return any royalty income received in any period.

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The Working Interest Owners are required to maintain books and records sufficient to determine the amounts payable under the Royalties. Additionally, in the event of a controversy between a Working Interest Owner and any purchaser as to the correct sales price for any production, amounts received by such Working Interest Owner and promptly deposited by it with an escrow agent are not considered to have been received by such Working Interest Owner, and, therefore, are not subject to being payable with respect to the Royalties until the controversy is resolved; but all amounts thereafter paid to such Working Interest Owner by the escrow agent will be considered amounts received from the sale of production. Similarly, operating costs include any amounts a Working Interest Owner is required to pay whether as a refund, interest or penalty to any purchaser because the amount initially received by such Working Interest Owner as the sales price was in excess of that permitted by the terms of any applicable contract, statute, regulation, order, decree or other obligation. Within 30 days following the close of each calendar quarter, the Working Interest Owners are required to deliver to the Trustee a statement of the computation of Net Proceeds attributable to such quarter.

The brief discussions of the Trust Indenture and the Conveyance contained herein are qualified in their entirety by reference to the Trust Indenture and the Conveyance themselves, which are exhibits to the Trust’s Annual Report on Form 10-K for the year ended December 31, 2025 and are available upon request from the Trustee.

Note 2 — Basis of Presentation

The accompanying unaudited financial information has been prepared by the Trustee in accordance with the instructions to Form 10-Q. The preparation of the financial statements requires estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates. The Trustee believes such information includes all the disclosures necessary to make the information presented not misleading. The information furnished reflects all adjustments which are, in the opinion of the Trustee, necessary for a fair presentation of the results for the interim periods presented. The financial information should be read in conjunction with the financial statements and notes thereto included in the Trust’s Annual Report on Form 10-K for the year ended December 31, 2025. The Trust considers all highly liquid investments with a maturity of three months or less to be cash equivalents. Subsequent events were evaluated through the issuance date of the financial statements.

In accordance with the Conveyance, the Working Interest Owners are obligated to calculate and pay the Trust each month an amount equal to 11.44% of 90% of the Net Proceeds (as defined in the Conveyance) attributable to the month.

The net overriding royalty interest is reviewed for impairment whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. If circumstances require the net overriding royalty interest to be tested for possible impairment, the Trust first compares undiscounted cash flows expected to be generated by the net overriding royalty interest to its carrying value. If the carrying value of the net overriding royalty interest is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying value exceeds its fair value. The fair value of the net overriding royalty interest is measured using valuation techniques consistent with the income approach, converting future cash flows to a single discounted amount.

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The financial statements of the Trust are prepared on the following modified cash basis of accounting:

(a) Royalty income recorded for a month is the amount computed and paid by the Working Interest Owners to the Trustee for such month rather than either the value of a portion of the oil and gas produced by the Working Interest Owners for such month or the amount subsequently determined to be the Trust’s proportionate share of the Net Proceeds for such month;

(b) Interest income, interest receivable and distributions payable to unitholders include interest to be earned on short-term investments from the financial statement date through the next date of distribution;

(c) Trust general and administrative expenses, net of reimbursements, are recorded in the month they are included in the calculation of the monthly distribution amount;

(d) Amortization of the Royalties is computed on a unit-of-production basis and is charged directly to trust corpus because such amount does not affect distributable income; and

(e) Distributions payable are determined on a monthly basis and are payable to unitholders of record as of the last business day of each month or such later date as the Trustee determines is required to comply with applicable law or stock exchange requirements. However, cash distributions are made quarterly in January, April, July and October, and include interest earned from the monthly record dates to the date of distribution.

This basis for reporting distributable income is considered to be the most meaningful because distributions to the unitholders for a month are based on net cash receipts for such month. However, these statements differ from financial statements prepared in accordance with accounting principles generally accepted in the United States of America because, under such principles, royalty income for a month would be based on Net Proceeds from production for such month without regard to when calculated or received, general and administrative expenses would be recorded in the month they accrue, and interest income for a month would be calculated only through the end of such month.

Segment reporting

The Trust has one business activity as the owner of an investment in net overriding royalty interest and operates in a single operating and reportable segment. Operating segments are defined as components of an entity for which separate financial information is evaluated regularly by the chief operating decision maker (the “CODM”), which is the Trustee. The segment participates in activities and derives its income from net overriding royalty interest as reported in the accompanying financial statements, and the CODM uses this in making decisions about the allocation of cash reserves for current and future Trust general and administrative expenses and the ultimate distribution to the Trust unitholders.

Note 3 — Legal Proceedings

Currently, except as described below, the Trust is not aware of any material legal proceedings pending to which the Trust is a party or of which any of its property is the subject. Based on information provided by Scout, there is a pending case that seeks to increase royalty calculations for wells operated by Scout in Kansas that flow through the Jayhawk plant. The lawsuit, Cooper-Clark Foundation v. Scout Energy Management, LLC, District Court, Kansas, is pending in federal district court in Kansas, and a question has been certified to the Kansas Supreme Court. In the event of an adverse result in the litigation, there may be a recalculation of prior royalties, and resulting net profits available to the Trust for the applicable

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periods, as to those wells included in the litigation. Eiger is the Working Interest Owner of these properties effective January 1, 2026. The Trust has not been informed of any material adverse effect on the Trust.

The Trustee has been advised by the Working Interest Owners that it may be subject to litigation in the ordinary course of business for certain matters that include the Royalty Properties. While each of the Working Interest Owners has advised the Trustee that it does not currently believe any of the pending litigation will have a material adverse effect net to the Trust, in the event such matters were adjudicated or settled in a material amount and charges are made against Royalty income, such charges could have a material impact on future Royalty income.

Note 4 — Income Tax Matters

In a technical advice memorandum dated February 26, 1982, the Internal Revenue Service (the “IRS”) advised the Dallas District Director that the Trust is classifiable as a grantor trust and not as an association taxable as a corporation. As a grantor trust, the Trust incurs no federal income tax liability and each unitholder is subject to tax on the unitholder’s pro rata share of the income and expense of the Trust as if the unitholder were the direct owner of a pro rata share of the Trust’s assets. In addition, there is no state tax liability for the period.

Individuals, estates, and trusts with income above certain thresholds are subject under Section 1411 of the Code to an additional 3.8% tax — also known as the Net Investment Income Tax (“NIIT”) — on their net investment income. Grantor trusts such as Mesa Royalty Trust are not subject to the NIIT; however, the unitholders may be subject to the tax. For these purposes, investment income would generally include certain income derived from investments, such as the royalty income derived from the units and gain realized by a unitholder from a sale of the units.

The Trustee assumes that some Trust units are held by a middleman, as such term is broadly defined in U.S. Treasury Regulations (and includes custodians, nominees, certain joint owners, and brokers holding an interest for a custodian in street name). Therefore, the Trustee considers the Trust to be a non-mortgage widely held fixed investment trust (“WHFIT”) for U.S. federal income tax purposes. Bank of New York Mellon Trust Company, N.A., 601 Travis Street, Floor 16, Houston, Texas 77002, telephone number 713-483-6020, is the representative of the Trust that will provide tax information in accordance with applicable U.S. Treasury Regulations governing the information reporting requirements of the Trust as a WHFIT.​

Notwithstanding the foregoing, the middlemen holding units on behalf of unitholders, and not the Trustee of the Trust, are solely responsible for complying with the information reporting requirements under the Treasury Regulations with respect to such units, including the issuance of IRS Forms 1099 and certain written tax statements. Unitholders whose units are held by middlemen should consult with such middlemen regarding the information that will be reported to them by the middlemen with respect to the units.

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Note 5 — Excess Production Costs

Excess production costs result when costs, charges, and expenses attributable to a Royalty Property exceed the revenue received from the sale of oil, gas, and other hydrocarbons produced from such property. The excess production costs are recoverable by the Working Interest Owners before any distribution of royalty income from the properties will be made to the Trust. As a result of excess production costs incurred in one monthly operating period and then recovered in a subsequent monthly operating period, the royalty income paid to the Trust may not agree to the Trust’s royalty interest in the Net Proceeds (as defined in the Conveyance). Excess production costs are reported by the Working Interest Owners for prior production months and may be based upon estimates that are subject to adjustment in future periods. The (21,837) balance currently presented as due to Mesa reflects the calculated balance on the books of Mesa. In July, 2026, San Juan Basin — Colorado Properties — Simcoe, now a subsidiary of Mach, informed the Trustee that it completed a true-up for periods from 2020 to the current reporting period ended June 30, 2026. The result of this true-up is under review and reconciliation with Simcoe, now a subsidiary of Mach. After the reconciliation was completed, Simcoe, now a subsidiary of Mach, has indicated that the result will be a reduction of the net credit deficit with the final amount due to Mesa.

Note 6 — Distributable Income Per Unit

The Trust’s royalty income from the Royalty Properties and its distributions to unitholders are heavily influenced by commodity prices received by Working Interest Owners. Commodity prices may fluctuate widely in response to (i) relatively minor changes in the supply of and demand for oil and natural gas, (ii) market uncertainty and (iii) a variety of additional factors that are beyond the Trustee’s control. Royalty income may be based upon spot market prices or on prices determined by contract.

The Trustee, acting pursuant to the Trust Indenture, may withhold royalty income for future unknown contingent liabilities and expenses (such cumulative withholding being the “Contingent Reserve”). The Trustee reserves the right to determine whether or not to release cash reserves in future periods with respect to any reimbursement expenses. At any given time, the Contingent Reserve is included in cash and short-term investments. The Trustee utilizes the Contingent Reserve in its discretion in accordance with the Conveyance, and adjusts the balance of the Contingent Reserve as necessary when funds are added or removed. The net effects of such adjustments for the six months ended June 30, 2026 resulted in the balance of the Contingent Reserve being equal to $1,946,006 as of June 30, 2026 and equal to $1,910,899 as of June 30, 2025.

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The effect on distributable income per unit of adjustments to the Contingent Reserve is as follows: