EXHIBIT 99.1 March 28, 2024 Ms. Kameron Fivecoat Reserves Manager XTO Energy Inc. 22777 Springwoods Village Parkway Spring, TX 77389  Re:

Underlying Properties (100%)Relating to the Hugoton Royalty TrustReserves and Future Net RevenuesAs of December 31, 2023SEC Price Case Dear Ms. Fivecoat: At your request, Miller and Lents, Ltd. (M&L) estimated the proved reserves and future net revenues as of December 31, 2023, attributable to
the XTO Energy Inc. (XTO) interest in certain oil and gas properties prior to inclusion in the Hugoton Royalty Trust, i.e., Underlying Properties (100%). The Underlying Properties (100%) include working interest properties from which net profits
interests were conveyed to the Hugoton Royalty Trust. The properties consist of approximately 1,340 leases and 1,461 wells located primarily in Kansas, Oklahoma, and Wyoming. The aggregate results of M&Ls evaluations are as follows:  Net Reserves


Future Net RevenuesReserves Category

Oil andCondensateMBBL


GasMMCF


UndiscountedM$


Discounted at10% Per YearM$KansasProved Developed Producing


96



4,925



6,750



3,849Total Proved


96



4,925



6,750



3,849OklahomaProved Developed Producing


1,318



56,325



105,652



62,428Total Proved


1,318



56,325



105,652



62,428WyomingProved Developed Producing


21



17,772



18,374



12,385Total Proved


21



17,772



18,374



12,385Total Underlying Properties (100%)Proved Developed Producing


1,434



79,022



130,776



78,662Total Proved


1,434



79,022



130,776



78,662 Oil and condensate volumes are expressed in thousand barrels (MBBL). Gas volumes are expressed in million cubic feet
(MMCF). Future net revenues are expressed in thousand dollars (M$). The report was prepared for the use of XTO in its financial and reserves
reporting and was completed on March 28, 2024. M&L performed evaluations, which are designated as the SEC Price Case, using price and expense premises specified by XTO and described in detail on Appendix 1. Proved reserves and future net revenues were estimated in accordance with the provisions contained in Securities and Exchange Commission Regulation S-X, Rule 4-10(a). The Securities and Exchange Commission definition of proved reserves is shown on Appendix 2 (not included). Gas volumes for each property are stated at




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Underlying Properties (100%) Relating to the Hugoton Royalty Trust March 28,
2024  the pressure and temperature bases appropriate for the sales contract or state regulatory authority; therefore, some of the aggregated totals may be stated at a mixed pressure base. No provisions
for the possible consequences, if any, of product sales imbalances were included in M&Ls projections since M&L received no relevant data. Estimates of future net revenues and discounted future net revenues are not intended and should
not be interpreted to represent fair market values for the estimated reserves. In M&Ls projections, future costs of abandoning facilities and wells were assumed to be offset by salvage values. Estimated costs, if any, for restoration of
producing properties to satisfy environmental standards are beyond the scope of this assignment. Following Appendix 2 (not included) is a list of
exhibits that include annual projections of future production and net revenues for each state and reserves category. Also included in the exhibits are one-line summaries for the total royalty trust and for
each state showing the proved reserves and future net revenues for the individual properties. These exhibits should not be relied upon independently of this narrative. The proved developed producing reserves and production forecasts were estimated by production decline extrapolations,
water-oil ratio trends, P/Z declines, or in a few cases, by volumetric calculations. For some properties with insufficient performance history to establish trends, M&L estimated future production by
analogy with other properties with similar characteristics. The past performance trends of many properties were influenced by production curtailments, workovers, waterfloods, and/or infill drilling. Actual future production may require that
M&Ls estimated trends be significantly altered. Reserves estimates from volumetric calculations and from analogies are often less certain than reserves estimates based on well performance obtained over a period during which a substantial
portion of the reserves was produced. The estimated proved developed nonproducing reserves can be produced from existing well bores but require
capital costs for recompletions or for pipeline connections. These proved developed nonproducing reserves estimates were based on analogies with other wells that commercially produce from the same formation in the same field. The timing of initial
production was provided to M&L by XTO. When actual production history is available for these nonproducing reserves, M&Ls reserves estimates may be significantly revised. The estimated proved undeveloped reserves require significant capital expenditures, such as for planned drilling and completion costs. The proved
undeveloped reserves estimates for infill wells are based on analogies to similar infill wells in the same field and/or the production histories of offset wells in the same field. As actual results of the planned drilling become available,
M&Ls reserves estimates may be significantly revised. The data employed in M&Ls estimations of proved reserves and future net
revenues were provided by XTO. The current expenses for each lease were obtained from operating statements provided by XTO except for certain leases where XTO deducted items considered by XTO to be nonrecurring expenditures. No overhead was included
for those properties operated by XTO. For some properties, such as large waterfloods, XTO assumed a decline in operating costs due to depleting production that was derived by forecasting a decrease in the property well count. For some gas
properties, XTO assumed operating costs would be split between a variable component and a fixed component. The variable component was a constant cost per thousand cubic feet of gas production and the fixed component was a constant cost per well
completion. The data provided to M&L by XTO, including, but not limited to, graphical representations and tabulations of past production performance, well tests and pressures, ownership interests, prices, capital expenditures, and operating
costs were accepted as represented and were considered appropriate for the purpose of this report. M&L employed all methods, data, procedures, and assumptions considered necessary and appropriate in utilizing the data provided to prepare this
report. The evaluations presented in this report, with the exceptions of those parameters specified by others, reflect M&Ls informed
judgments and are subject to the inherent uncertainties associated with interpretation of geological, geophysical, and engineering information. These uncertainties include, but are not limited to, (1) the




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Underlying Properties (100%) Relating to the Hugoton Royalty Trust March 28,
2024  utilization of analogous or indirect data and (2) the application of professional judgments. Government policies and market conditions different from those employed in this study may cause
(1) the total quantity of oil, natural gas liquids, or gas to be recovered, (2) actual production rates, (3) prices received, or (4) operating and capital costs to vary from those presented in this report. At this time, M&L
is not aware of any regulations that would affect XTOs ability to recover the estimated reserves. Miller and Lents, Ltd. is an independent
oil and gas consulting firm. No director, officer, or key employee of Miller and Lents, Ltd. has any financial ownership in XTO Energy Inc. or any related company. M&Ls compensation for the required investigations and preparation of this
report is not contingent on the results obtained and reported, and it has not performed other work that would affect M&Ls objectivity. Production of this report was supervised by Jennifer A. Godbold, P.E., an officer of the firm who is a
licensed Professional Engineer in the State of Texas and is professionally qualified, with more than 12 years of relevant experience, in the estimation, assessment, and evaluation of oil and gas reserves. M&Ls work papers and data are in its files and available for review upon request. If you have any questions regarding the above, or if M&L
can be of further assistance, please call.  Very truly yours,MILLER AND LENTS, LTD.Texas Registered Engineering Firm No. F-1442By

/S/ JENNIFER A. GODBOLDJennifer A. Godbold, P. E.Senior Vice President




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Appendix 1 Hugoton Royalty Trust (100%) SEC PRICE CASE  A.

Oil Price

Average price during the 12-month period prior to 12/31/23 determined as the arithmetic
average of the first-day-of-the-month price for each month during the year 2023. The
average price was based on the West Texas Intermediate benchmark price. The arithmetic average of the
first-day-of-the-month benchmark prices is $78.22 per barrel and is held constant through
the life of the property. The average realized price, after appropriate adjustments, is $75.88 per barrel.B.

Gas Price

Average price during the 12-month period prior to 12/31/23 determined as the arithmetic
average of the first-day-of-the-month price for each month during the year 2023. The
average price was based on the Henry Hub benchmark price. The arithmetic average of the
first-day-of-the-month benchmark price is $2.637 per MMBTU and is held constant through
the life of the property. The average realized price, after appropriate adjustments is $2.59 per MCF.C.

Operating Costs

Current expenses held constant through the life of the property. For some properties, expenses included a variable component that was
a constant cost per unit of gas production and a fixed component that was a constant cost per well completion.D.

Discount Rate

10% per year.