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Managed Distribution Policy

The Board of Directors of Adams Natural Resources Fund, Inc. (the “Fund”) adopted a Managed Distribution Policy (“MDP”) to enhance long-term shareholder value by paying level quarterly distributions at a committed rate of 8% of average net asset value (“NAV”) per year. Distributions in accordance with the MDP began in the third quarter of 2024.

The Fund pays distributions four times a year. Distributions under the MDP can be derived from net investment income, realized capital gains, or possibly, returns of capital, and are payable in newly issued shares of common stock unless a shareholder specifically elects to receive cash. The Fund has committed to distribute 2% of average NAV for each quarterly distribution, with the fourth quarter distribution to be the greater of 2% of average NAV or the amount needed to satisfy minimum distribution requirements of the Internal Revenue Code for regulated investment companies. Average NAV is based on the average of the previous four quarter-end NAVs per share prior to each declaration date.

With each distribution, the Fund will issue a notice to shareholders that will provide detailed information regarding the amount and composition of the distribution and other related information. The amounts and sources of distributions reported in the notice to shareholders are only estimates and are not being provided for tax reporting purposes. The actual amounts and sources of the distributions for tax reporting purposes will depend upon the Fund’s investment experience during its fiscal year and may be subject to changes based on tax regulations. Shareholders will receive a Form 1099-DIV in January for the previous calendar year that will indicate how to report these distributions for federal income tax purposes.

Disclaimers

The primary purpose of the MDP is to provide shareholders with a constant, but not guaranteed, rate of distribution each quarter. You should not draw any conclusions about the Fund’s investment performance from the amount of the current distribution or from the terms of the Fund’s MDP. The Board may amend or terminate the MDP at any time without prior notice to shareholders. However, at this time, there are no reasonably foreseeable circumstances that might cause the termination of the MDP.

2025 at a Glance

(unaudited)

​	NYSE Symbol	​	​	PEO	​
​	Market Price	​	​	$21.74	​
​	52-Week Range	​	​	$18.47 – $23.91	​
​	Discount	​	​	9.8%	​
​	Shares Outstanding	​	​	27,501,854	​

Summary Financial Information

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*

The Fund’s MDP was effective for the final two quarters in 2024, resulting in a less than 8% distribution rate for the year.

​

2025 Dividends and Distributions

2026 Annual Meeting of Shareholders

Location: Adams Funds, 500 East Pratt Street, Suite 1300, Baltimore, MD 21202
Date: April 16, 2026
Time: 9:30 a.m.

1​

Dear Fellow Shareholders,

For the third consecutive year, the S&P 500 Index notched a double-digit gain in 2025, something that had occurred only six previous times since 1940. The Index has delivered an impressive annualized return of 23.0% over the last three years, even though it has often felt like scaling a wall of worry amid persistently high uncertainty. Despite all the record highs achieved along the way, 2025 was no exception, reminding investors that markets rarely move in straight lines.

This year was full of challenges and surprises. In late January, Chinese start-up DeepSeek’s breakthrough Artificial Intelligence (AI) model sparked fears of a spending bubble and raised questions about whether U.S. tech giants could maintain their competitive edge. The decline in AI stocks, coupled with softer economic data and cautious corporate outlooks, led to rising fears of a possible recession.

Tariff and trade tensions escalated in March, culminating in President Trump’s April 2 “Liberation Day” announcement of sweeping tariffs on imports for much of the world, with particularly steep rates aimed at China. The news sent shockwaves through global markets, resulting in the S&P 500 declining 19% from its February highs. However, the market quickly regained its footing and rallied almost 40% from its April lows through the rest of the year supported by favorable negotiations that resulted in lower tariffs than initially feared, strong corporate earnings, and positive economic data.

In that environment, the Energy sector advanced 8.7% in 2025 but trailed the S&P 500 Index. Our Fund, with exposure to both Energy and Materials, outperformed during the period, returning 9.4% on net asset value and 9.9% on market price, compared to a 9.1% return for the Fund’s benchmark (80% S&P 500 Energy Sector and 20% S&P 500 Materials Sector). We distributed $55 million to our shareholders in 2025, representing an 8.4% annual distribution rate and exceeding our 8% annual commitment.

2025 Market Recap

West Texas Intermediate (WTI) crude oil prices closed a volatile year down nearly 20%, falling below $60 per barrel amid growing concerns around a widely-anticipated supply imbalance in 2026. The return of two million-plus barrels per day of curbed production from OPEC+ into a relatively balanced market, combined with non-OPEC production growth, pressured prices despite some occasional spikes driven by flaring geopolitical risks.

Natural gas prices advanced more than 15% during the year, supported by expectations for robust demand growth, both to support liquified natural gas (LNG) exports and, for the first time in many years, new power generation to support electricity demand growth. AI data centers and infrastructure to support higher electrification trends across the economy are expected to provide support for strong demand growth in natural gas for several years.

Energy stocks performed better than their primary commodities in 2025. The energy industry has improved its capital discipline over the last several years, resulting in higher margins, stronger balance sheets, and more attractive returns of capital to shareholders. Additionally, the industry cut costs and utilized new technologies to generate cash flow growth even in the face of sluggish commodity prices.

2

Letter To Shareholders (continued)

These dynamics helped make Energy the best performing sector in the S&P 500 in the first quarter of 2025, as investors shifted away from growth stocks and were attracted by the sector’s defensive characteristics. In the second quarter, the sector gave back these gains and finished the first half near the bottom of the Index’s rankings, with a modest six-month increase. In the second half of the year, the sector advanced over 5%, but trailed the broader market’s strong gains.

Within the Energy sector, every industry group posted a gain in 2025. The Refining & Marketing group was by far the top performer, supported by strong earnings growth and positive estimate revisions. Lower oil prices and robust demand for refined products were a positive combination for refiners, and as a result, margins remained strong for most of the year. The Equipment & Services group was surprisingly strong, especially late in the year. One dynamic that helped these stocks was their exposure to distributed power generation for data centers. Services companies have been providing power generation capabilities in the oil field, where access to grid-provided power is often unavailable, to support drilling operations. Increasingly these capabilities are being applied to AI data centers, where the need for power is occurring faster than the traditional utility providers can build it for them.

Materials stocks posted a double-digit gain in 2025, led by the persistent strength in gold and other precious metals, which repeatedly set record highs. Gold surged 64% during the year, while silver climbed 148%, the strongest annual gains for each since 1979. Copper also reached new highs in December, finishing the year up more than 33%, supported by increasing demand for electricity, bolstered by the rapid expansion of AI data centers.

As a result of this strength in precious metals, Metals & Mining was the best performing group in the Materials sector, up nearly 80%. Outside of precious metals, stocks with exposure to copper, steel, rare earth metals, and uranium were bolstered by strong government backing, supply tightness, and the re-emergence of nuclear power as part of the solution for increased power demand. In contrast, Containers & Packaging and Chemicals stocks were weak, as stable but stagnant global demand in a well-supplied market meant firms were left with no volume growth and little pricing leverage.

Portfolio Performance

Our Fund generated a 9.4% total return on net asset value during the year, ahead of our benchmark by 0.3%. Stock selection in the Materials sector was a primary contributor to our relative performance, led by strength in the Containers & Packaging and Chemicals groups. The Energy Sector was also a positive contributor, driven by our positions in the Equipment & Services and Integrated Oil & Gas groups. These gains were partially offset by relative underperformance in Metals & Mining in Materials and Exploration & Production (E&P) in Energy.

Our Materials holdings advanced 11.8%, compared to a 10.6% gain in the benchmark. Within Containers & Packaging, Crown Holdings was the top contributor as the company benefited from rising volumes for beverage cans, as well as operational improvements and the ability to pass on cost increases to customers. This led to results that exceeded the market’s expectations throughout the year. In the Chemicals industry, our position in DuPont de Nemours was a notable contributor. The company spun out its semiconductor chemicals business during the year, allowing the market to appreciate the favorable product positioning and financial condition of the stand-alone DuPont business relative to its peers.

Within Metals & Mining, our addition of Nucor Corp. during the year was a meaningful contributor to performance. The steelmaker has several capacity additions and facility upgrades coming online over the next two years, which will provide significant volume growth opportunities as well as leverage to higher domestic steel pricing from tariffs. This benefit was partially offset by not having enough exposure to Newmont Mining, which soared with the price of gold and gained 172.8% during the year.

In Energy, Equipment & Services was the largest driver of relative performance as our holdings outperformed the benchmark by 4.0%. The leading contributor was our position in TechnipFMC, which rose 54.8% during the year. Robust spending on offshore oil and gas developments remained strong throughout 2025, and TechnipFMC is the market leader for subsea equipment. As a result, the company continued to generate strong backlog and earnings growth.

3​

Letter To Shareholders (continued)

In the Integrated Oil & Gas group, two Canada-based companies were key contributors. Cenovus reported favorable results throughout the year, amid surging oil sands production and improved refinery utilization rates. This refining-related improvement was key to the stock’s performance, as the company had struggled in previous years to improve the reliability of acquired refining assets. Suncor, another company with both E&P and refining assets, continued to benefit from the successful efforts of new management to improve cost competitiveness relative to its peers.

The Fund generated positive relative returns from companies that have operations related to energy infrastructure. Hubbell Incorporated and Eaton Corporation both design and manufacture electrical products for residential, industrial, and utility customers. GE Vernova is one of the largest global providers of natural gas-powered turbines. All three companies are primary beneficiaries of the secular trend for increasing electricity demand in the U.S that is expected to provide strong growth in earnings and cash flow for several years.

Outlook for 2026

The market’s three-year rise has featured all kinds of stops and starts: everything from high levels of exuberance to fears of a recession, and from excitement about rising productivity driven by AI to worries about the impact of tariffs and other unpredictable policy moves from both the Trump administration and the Fed. Through it all, the market persevered.

There are, as always, plenty of things to worry about. There are also reasons for optimism, including likely higher tax refunds for consumers. For businesses, potential tax cuts and improved expensing rules for capital investments could boost corporate cash flows and incentivize spending on technology and infrastructure. Finally, 2026 will include the World Cup being held in North America and the celebration of our nation’s 250th anniversary, both of which will likely stimulate consumer spending.

What has given us comfort in the past and helps to underpin our optimism for the coming year is the continuing strength in corporate earnings growth. Earnings have shown remarkable resilience across the three-year bull market. Despite periods of volatility and shifting macro conditions, companies consistently delivered upside surprises, supported by disciplined cost management and strategic investment. Looking ahead to 2026, that foundation remains intact.

Whatever happens, we will continue to invest in quality companies at attractive valuations, with an appropriate focus on risk management. We remain focused on businesses with strong balance sheets, recurring revenues, and proven capital allocation strategies, which we believe compounds value across market cycles. This grounded approach has served us well across many market environments, and we believe it will continue to do so as we face whatever challenges 2026 might present.

We appreciate your trust and look forward to the year ahead.

By order of the Board of Directors,

January 23, 2026

4

Investment Growth

(unaudited)

This following shows the value of hypothetical $10,000 investments in the Fund at market price and in the Fund’s benchmarks over the past 10 years with dividend and distributions reinvested. All Fund distributions are assumed to be reinvested at the lower of the net asset value per share or the closing NYSE market price on the distribution’s valuation date. Amounts do not reflect taxes paid by shareholders on distributions or the sale of shares.

Disclaimers​

This report contains “forward-looking statements” within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. By their nature, all forward-looking statements involve risks and uncertainties, and actual results could differ materially from those contemplated by the forward-looking statements. Several factors that could materially affect the Fund’s actual results are the performance of the portfolio of stocks held by the Fund, the conditions in the U.S. and international financial markets, the price at which shares of the Fund will trade in the public markets, and other factors discussed in the Fund’s periodic filings with the Securities and Exchange Commission.​

This report is transmitted to the shareholders of the Fund for their information. It is not a prospectus, circular or representation intended for use in the purchase or sale of shares of the Fund or of any securities mentioned in the report. The rates of return will vary and the principal value of an investment will fluctuate. Shares, if sold, may be worth more or less than their original cost. Past performance is no guarantee of future investment results.

5​

December 31, 2025
(unaudited)

Ten Largest Equity Portfolio Holdings

Industry Weightings as a Percent of Net Assets

6

Statement of Assets and Liabilities

December 31, 2025

​

*

See Schedule of Investments beginning on page 17.

​

The accompanying notes are an integral part of the financial statements.

7​

Statement of Operations

Year Ended December 31, 2025

The accompanying notes are an integral part of the financial statements.

8

Statements of Changes in Net Assets

The accompanying notes are an integral part of the financial statements.

9​

Notes To Financial Statements

Adams Natural Resources Fund, Inc. (the “Fund”) is registered under the Investment Company Act of 1940 (“1940 Act”) as a non-diversified investment company. The Fund is an internally managed closed-end fund specializing in energy and other natural resources stocks. Its investment objectives are preservation of capital, the attainment of reasonable income from investments, and an opportunity for capital appreciation.

1. SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation — The Fund is an investment company and applies the accounting and reporting guidance of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 946 Financial Services - Investment Companies. The accompanying financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), which require the use of estimates by Fund management. Management believes that estimates and valuations are appropriate; however, actual results may differ from those estimates and the valuations reflected in the financial statements may differ from the value the Fund ultimately realizes. Additionally, unpredictable events such as natural disasters, war, terrorism, global pandemics, and similar public health threats may significantly affect the economy, markets, and companies in which the Fund invests. The Fund could be negatively impacted if the value of portfolio holdings are harmed by such events.

Affiliates — Adams Diversified Equity Fund, Inc. (“ADX”), a diversified, closed-end investment company, owns 9.4% of the Fund’s outstanding shares and is, therefore, an “affiliated company” as defined by the 1940 Act. During the year ended December 31, 2025, the Fund paid dividends and capital gain distributions of $4,972,236 to ADX. Directors of the Fund are also directors of ADX. The Fund, ADX, and Adams Funds Advisers, LLC (“AFA”), an ADX-affiliated investment adviser to external parties, have a shared management team.

Distributions — Distributions to shareholders are recorded on the ex-dividend date. The Fund employs a Managed Distribution Policy (“MDP”) that pays level quarterly distributions at a committed rate of 8% of average net asset value per year. Average net asset value is based on the average of the previous four quarter-end net asset values per share prior to the declaration date. Distributions are generated from portfolio income and capital gains derived from managing the portfolio and are initially recorded as a distribution from total distributable earnings and reclassified to distributions from income and capital gains at the end of the tax year, based on the Fund’s total taxable income and realized capital gains for the full year. If such earnings do not meet the distribution commitment, or it’s deemed in the best interest of shareholders, the Fund may return capital. A return of capital is not taxable to shareholders and does not necessarily reflect the Fund’s investment performance.

Expenses — The Fund shares personnel, systems, and other infrastructure items with ADX and AFA and is charged a portion of the shared expenses. To protect the Fund from potential conflicts of interest, policies and procedures are in place covering the sharing of expenses among the entities. Expenses solely attributable to an entity are charged to that entity. Expenses that are not solely attributable to one entity are allocated in accordance with the Fund’s expense sharing policy. The Fund’s policy dictates that expenses, other than those related to personnel, are attributed to AFA based on the average estimated amount of time spent by all personnel on AFA-related activities relative to overall job functions; the remaining portion is attributed to the Fund and ADX based on relative net assets excluding affiliated holdings. Personnel-related expenses are attributed to AFA based on the individual’s time spent on AFA-related activities; the remaining portion is attributed to the Fund and ADX based on relative market values of portfolio securities covered for research staff and relative net assets excluding affiliated holdings for all others. Expense allocations are updated quarterly. Because AFA has no assets under management, only those expenses directly attributable to AFA are charged to AFA.

10

Notes To Financial Statements (continued)

For the year ended December 31, 2025, shared expenses totaled $17,645,194, of which $13,626,077 and $1,543 were charged to ADX and AFA, respectively, in accordance with the Fund’s expense sharing policy. There were no amounts due to, or due from, affiliated companies at December 31, 2025.

Investment Transactions and Income — The Fund’s investment decisions are made by the portfolio management team with recommendations from the research staff. Policies and procedures are in place covering the allocation of investment opportunities among the Fund and its affiliates to protect the Fund from potential conflicts of interest. Investment transactions are accounted for on trade date. Realized gains and losses on sales of investments are recorded on the basis of specific identification. Dividend income is recognized on the ex-dividend date.

Segment Reporting — The Fund’s primary business is to invest assets to generate returns from investment income and capital appreciation and is operated as a single segment in carrying out its investment objectives. The Fund’s management committee, comprised of the Fund’s chief executive officer, chief financial officer, and general counsel, serves as the chief operating decision maker in determining key operating decisions that include capital allocation and expense structure for the Fund and executing significant contracts on behalf of the Fund. All significant expense categories are presented on the Statement of Operations and are used for budgeting purposes. The management committee uses change in net assets from operations, as presented on the Statement of Operations, and total investment return based on net asset value and ratio of expenses to average net assets, as presented on the Financial Highlights, to assess fund performance and allocate resources.

Valuation — The Fund’s financial instruments are reported at fair value, which is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Fund has a Valuation Committee (“Committee”) so that financial instruments are appropriately priced at fair value in accordance with GAAP and the 1940 Act. Subject to oversight and approval by the Board of Directors, the Committee establishes methodologies and procedures to value securities for which market quotations are not readily available.

GAAP establishes the following hierarchy that categorizes the inputs used to measure fair value:

•

Level 1 — fair value is determined based on market data obtained from independent sources; for example, quoted prices in active markets for identical investments;

​

•

Level 2 — fair value is determined using other assumptions obtained from independent sources; for example, quoted prices for similar investments;

​

•

Level 3 — fair value is determined using the Fund’s own assumptions, developed based on the best information available under the circumstances.

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Investments in securities traded on national exchanges are valued at the last reported sale price as of the close of regular trading on the relevant exchange on the day of valuation. Over-the-counter and listed equity securities for which a sale price is not available are valued at the last quoted bid price. Money market funds are valued at net asset value. These securities are generally categorized as Level 1 in the hierarchy.

Total return swap agreements are valued using independent, observable inputs, including underlying security prices, dividends, and interest rates. These securities are generally categorized as Level 2 in the hierarchy.

11​

Notes To Financial Statements (continued)

At December 31, 2025, the Fund’s financial instruments were classified as follows:

2. FEDERAL INCOME TAXES

No federal income tax provision is required since the Fund’s policy is to qualify as a regulated investment company under the Internal Revenue Code and to distribute substantially all of its taxable income and gains to its shareholders. Additionally, management has analyzed the tax positions included in federal income tax returns from the previous three years that remain subject to examination, and concluded no provision was required. Any income tax-related interest or penalties would be recognized as income tax expense. At December 31, 2025, the identified cost of securities for federal income tax purposes was $518,430,784 and net unrealized appreciation aggregated $145,601,997, consisting of gross unrealized appreciation of $183,995,253 and gross unrealized depreciation of  $38,393,256.

Distributions are determined in accordance with the Fund’s MDP and income tax regulations, which may differ from GAAP. Such differences are primarily related to the Fund’s retirement plan, equity-based compensation, wash sales, and tax straddles for total return swaps. Differences that are permanent, while not material for the year ended December 31, 2025, are reclassified in the capital accounts of the Fund’s financial statements and have no impact on net assets. For tax purposes, distributions paid by the Fund during the years ended December 31, 2025 and December 31, 2024 were classified as ordinary income of $14,948,177 and $16,613,652, respectively, and long-term capital gain of $39,846,872 and $28,776,315, respectively. The tax basis of distributable earnings at December 31, 2025 was $1,984,856 of undistributed ordinary income and $3,432,441 of undistributed long-term capital gain.

3. INVESTMENT TRANSACTIONS

Purchases and sales of portfolio investments, other than short-term investments, securities lending collateral, and derivative transactions, during the year ended December 31, 2025 were $134,499,288 and $145,610,460, respectively.

4. DERIVATIVES

The Fund may invest in derivative instruments. The Fund uses derivatives for a variety of purposes, including, but not limited to, the ability to gain or limit exposure to particular market sectors or securities, to provide additional capital gains, to limit equity price risk in the normal course of pursuing its investment objectives, and/or to obtain leverage.

Total Return Swap Agreements — The Fund utilizes total return swap agreements in carrying out a paired trade strategy, where it enters into a long contract for a single stock and a short contract for a sector exchange-traded fund in comparable notional amounts. Total return swap agreements involve commitments based on a notional amount to pay interest in exchange for a market-linked return of a reference security. Upon closing a long contract, the Fund will receive a payment to the extent the total return of the reference security is positive for the contract period and exceeds the offsetting interest rate obligation or will make a payment if the total return is negative for the contract period. Upon closing a short contract, the Fund will receive a payment to the extent the total return of the reference security is negative for the contract period and exceeds the offsetting interest rate obligation or will make a payment if the total return is positive for the contract period. The fair value of each total return swap agreement is determined daily and the change in

12

Notes To Financial Statements (continued)

value is recorded as a change in unrealized appreciation on total return swap agreements in the Statement of Operations. Payments received or made upon termination during the period are recorded as a realized gain or loss on total return swap agreements in the Statement of Operations.

Total return swap agreements entail risks associated with counterparty credit, liquidity, and equity price risk. Such risks include that the Fund or the counterparty may default on its obligation, that there is no liquid market for these agreements, and that there may be unfavorable changes in the price of the reference security. To mitigate the Fund’s counterparty credit risk, the Fund enters into master netting and collateral arrangements with the counterparty. A master netting agreement allows either party to terminate the agreement prior to termination date and provides the ability to offset amounts the Fund owes the counterparty against the amounts the counterparty owes the Fund for a single net settlement. The Fund’s policy is to net all derivative instruments subject to a netting agreement and offset the value of derivative liabilities against the value of derivative assets. The net cumulative unrealized gain (asset) on open total return swap agreements or the net cumulative unrealized loss (liability) on open total return swap agreements is presented in the Statement of Assets and Liabilities. The fair value of each open total return swap agreement is presented on the Schedule of Investments. During the year ended December 31, 2025, the average daily notional amounts of open long and short total return swap agreements, an indicator of the volume of activity, were $1,203,276 and $(1,205,930), respectively.

A collateral arrangement requires each party to provide collateral with a value, adjusted daily and subject to a minimum transfer amount, equal to the net amount owed to the other party under the agreement. The counterparty provides cash collateral to the Fund and the Fund provides collateral by segregating portfolio securities, subject to a valuation allowance, into a tri-party account at its custodian. At December 31, 2025, there were no securities pledged as collateral and no cash collateral was held by the Fund.

5. CAPITAL STOCK

The Fund has 5,000,000 authorized and unissued preferred shares, $0.001 par value.

The Fund pays distributions four times a year under the MDP in newly issued shares of its Common Stock, unless a shareholder elects to receive cash. Shares are issued at the lower of the net asset value per share or the closing market price on the date of valuation. Prior to the adoption of the MDP, the Fund issued shares in payment of the fourth quarter distribution, by shareholder election, at the average market price on the date of valuation. Additionally, the Fund issues shares as dividend equivalents to holders of deferred stock units under the 2005 Equity Incentive Compensation Plan.

The Fund may purchase shares of its Common Stock from time to time, in accordance with parameters set by the Board of Directors, at such prices and amounts as the portfolio management team deems appropriate. Additionally, the Fund will repurchase shares under the Fund’s enhanced discount management and liquidity program, subject to certain restrictions, when the discount exceeds 15% of net asset value for at least 30 consecutive trading days. The enhanced program also provides that the Fund will engage in a proportional tender offer to repurchase shares when the discount exceeds 19% of net asset value for 30 consecutive trading days, not to exceed one such offer in any twelve-month period.

Transactions in its Common Stock for 2025 and 2024 were as follows:

13​

Notes To Financial Statements (continued)

6. RETIREMENT PLANS

The Fund sponsors a qualified defined contribution plan for all employees with at least six months of service and a nonqualified defined contribution plan for eligible employees to supplement the qualified plan. The Fund matches employee contributions made to the plans and, subject to Board approval, may also make a discretionary contribution to the plans. During the year ended December 31, 2025, the Fund recorded matching contributions of  $115,763 and a liability, representing the 2025 discretionary contribution, of $86,699.

7. EQUITY-BASED COMPENSATION

The Fund’s 2005 Equity Incentive Compensation Plan, adopted at the 2005 Annual Meeting and reapproved at the 2010 Annual Meeting, expired on April 27, 2015. Restricted stock units granted to non-employee directors that are 100% vested, but payment of which has been deferred at the election of the director, remain outstanding at December 31, 2025.

Outstanding awards were granted at fair market value on grant date (determined by the average of the high and low price on that date) and earn an amount equal to the Fund’s per share distribution, payable in reinvested shares, which are paid concurrently with the payment of the original share grant.

A summary of the activity during the year ended December 31, 2025 is as follows:

At December 31, 2025, the Fund had no unrecognized compensation cost. The total fair value of awards issued during the year ended December 31, 2025 was $29,008.

8. OFFICER AND DIRECTOR COMPENSATION

The aggregate remuneration paid by the Fund during the year ended December 31, 2025 to officers and directors amounted to $2,190,090, of which $399,258 was paid to non-employee directors. These amounts represent the taxable income, including $29,008 in deferred director compensation from previous years, to the Fund’s officers and directors and, therefore, may differ from the amounts reported in the accompanying Statement of Operations that are recorded and expensed in accordance with GAAP. At December 31, 2025, $1,254,900 was due to officers and directors, representing amounts related to estimated cash compensation and estimated retirement plan discretionary contributions payable to officers and reinvested dividend payments on deferred stock awards payable to directors.

9. PORTFOLIO SECURITIES LOANED

The Fund makes loans of securities to approved brokers to earn additional income. The loans are collateralized by cash and/or U.S. Treasury and government agency obligations valued at 102% of the value of the securities on loan. The market value of the loaned securities is calculated based upon the most recent closing prices and any additional required collateral is delivered to the Fund on the next business day. On loans collateralized by cash, the cash collateral is invested in a registered money market fund. The Fund accounts for securities lending transactions as secured financing and retains a portion of the income from lending fees and interest on the investment of cash collateral. The Fund also continues to receive dividends on the securities loaned. Gain or loss in the fair value of securities loaned that may occur during the term of the loan will be for the account of the Fund. At December 31, 2025, the Fund had no securities on loan. The

14

Notes To Financial Statements (continued)

Fund is indemnified by the custodian, serving as lending agent, for the loss of loaned securities and has the right under the lending agreement to recover the securities from the borrower on demand.

10. LEASES

The Fund and its affiliates jointly lease office space and equipment under non-cancelable lease agreements expiring at various dates through 2033. Payments are made in aggregate pursuant to these agreements but are deemed variable for each entity, as the allocable portion to each entity fluctuates when applying the expense sharing policy among all affiliates at each payment date. Variable payments of this nature do not require recognition of an asset or an offsetting liability in the Statement of Assets and Liabilities and are recognized as rental expense on a straight-line basis over the lease term within occupancy and other office expenses in the Statement of Operations. During the year, the Fund recognized rental expense of  $93,442.

11. COMMITMENTS AND CONTINGENCIES

In the normal course of business, the Fund enters into agreements that can expose the Fund to some risk of loss. The risk of future loss arising from any such agreements, while not quantifiable, is expected to be remote. As such, and as of the end of the reporting period, the Fund did not have any unfunded commitments. From time to time, the Fund may be a party to certain legal proceedings in the ordinary course of business, including proceedings relating to the enforcement of the Fund’s rights under contracts or within bylaws. As of the end of the reporting period, management has determined that any legal proceedings the Fund is subject to are unlikely to have a material impact to the Fund’s financial statements.

15​

Financial Highlights

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(a)

Total investment return is calculated assuming a purchase of a Fund share at the beginning of the period and a sale on the last day of the period reported either at net asset value or market price per share, excluding any brokerage commissions. Distributions are assumed to be reinvested at the lower of the net asset value per share or the closing NYSE market price on the distribution’s valuation date.

​

The accompanying notes are an integral part of the financial statements.

16

Schedule of Investments

December 31, 2025

17​

Schedule of Investments (continued)

December 31, 2025

18

Schedule of Investments (continued)

December 31, 2025

Total Return Swap Agreements — 0.0%

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(a)

Common stocks are listed on the New York Stock Exchange or NASDAQ and are valued at the last reported sale price on the day of valuation. See note 1 to financial statements.

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(b)

Presently non-dividend paying.

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(c)

Rate presented is as of period-end and represents the annualized yield earned over the previous seven days.

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(d)

Counterparty for all open total return swap agreements is Morgan Stanley.

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The accompanying notes are an integral part of the financial statements.

19​

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of Adams Natural Resources Fund, Inc.

Opinion on the Financial Statements

We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of Adams Natural Resources Fund, Inc. (the “Fund”) as of December 31, 2025, the related statement of operations for the year ended December 31, 2025, the statements of changes in net assets for each of the two years in the period ended December 31, 2025, including the related notes, and the financial highlights for each of the five years in the period ended December 31, 2025 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Fund as of December 31, 2025, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period ended December 31, 2025 and the financial highlights for each of the five years in the period ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Fund’s management. Our responsibility is to express an opinion on the Fund’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits of these financial statements in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our procedures included confirmation of securities owned as of December 31, 2025 by correspondence with the custodian, transfer agent and brokers. We believe that our audits provide a reasonable basis for our opinion.

PricewaterhouseCoopers LLP

Baltimore, Maryland
February 13, 2026

We have served as the Fund’s auditor since 1929.

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Principal Changes in Portfolio Securities

During the Six Months Ended December 31, 2025
(unaudited)

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New position

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The transactions presented above represent all new and fully-eliminated positions and up to the fifteen largest net additions and reductions to existing portfolio securities during the period, and exclude those in sector exchange-traded funds.

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Historical Financial Statistics

(unaudited)

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Beginning in 2024, the annual distribution rate is calculated as the total dividends and distributions per share for the year divided by the average of the Fund’s net asset value per share for the four quarter-end periods ending September 30, in accordance with the Managed Distribution Policy adopted in May 2024. Prior to that, the calculation was based on the Fund’s average month-end stock price for the twelve months ended October 31, in accordance with the annual 6% minimum distribution rate commitment then in effect.

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Other Information

(unaudited)

Summary Fund Information

Investment Objectives: The Fund’s investment objectives are preservation of capital, reasonable income, and opportunity for capital gain. These objectives have been in place since the Fund’s inception in 1929, although they may be changed by the Board of Directors.

Investment Strategy and Policies: The Fund is an internally-managed non-diversified U.S. equity fund that invests in highly liquid energy and other natural resources stocks. As a fundamental policy, at least 80% of its assets are invested in petroleum or natural resources industries or industries connected with, serving and/or supplying the petroleum or natural resources industries. The Fund has broad flexibility to invest in stocks of varying capitalizations, and primarily invests in stocks found in the S&P 500 Energy and S&P 500 Materials sectors.

In addition, the Fund maintains the following fundamental investment policies that may change only with shareholder approval:

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At least 25% of assets must be invested in petroleum and petroleum-related industries.

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Up to 25% of assets may be invested in commodities related to petroleum, minerals and related products, including swaps.

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Up to 10% of assets may be invested in real property.

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Principal Risks:

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during more prolonged market downturns. Local, regional, or global events such as war, acts of terrorism, the spread of infectious illness or other public health issue, recessions, or other events could have a significant impact on the Fund and its investments. Additionally, closed-end funds are particularly impacted by investor sentiment that could result in trading at increased premiums or discounts to the Fund’s NAV.

Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The S&P 500 is comprised of common stocks, which generally subject their holders to more risks than preferred stocks and debt securities because common stockholders’ claims are subordinated to those of holders of preferred stocks and debt securities.

Industry Concentration Risk. Funds that invest significantly in a single industry (sector) are subject to more volatility than funds that invest in the broader market. These funds can, and often do, perform differently than the overall market. The Fund normally invests a significant portion of its assets in the common stocks of companies principally engaged in activities in the energy industry, and its performance largely depends—for better or for worse—on the overall condition of the energy industry. Energy prices (including commodity prices), supply-and-demand for energy resources, various political, regulatory, and economic factors, and the relatively limited number of issuers of energy-related securities can each impact the Fund’s performance. Downturns in the energy industry can negatively affect Fund performance.

Derivatives Risk. The Fund invests in total return swaps agreements, which entail counterparty credit, liquidity, and equity price risks. Such risks include that the Fund or the counterparty may default on its obligation, that there is no liquid market for these agreements, and that there may be unfavorable changes in the price of the reference security.

Annual Certification

The Fund’s CEO has submitted to the New York Stock Exchange the annual CEO certification as required by Section 303A.12(a) of the NYSE Listed Company Manual.

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Other Information  (continued)

(unaudited)

Distribution Policy

In May 2024, the Fund adopted a managed distribution policy (“MDP”) that pays level quarterly distributions at a committed rate of 8% of average net asset value (“NAV”) per year. Distributions in accordance with the MDP began in the third quarter of 2024. The commitment is not a guarantee and may be changed by the Board should market or other conditions warrant.

The Fund pays distributions four times a year. Distributions under the MDP can be derived from net investment income, realized capital gains, or possibly, returns of capital, and are payable in newly issued shares of common stock unless a shareholder specifically elects to receive cash. The Fund has committed to distribute 2% of average NAV for each quarterly distribution, with the fourth quarter distribution to be the greater of 2% of average NAV or the amount needed to satisfy minimum distribution requirements of the Internal Revenue Code for regulated investment companies. Average NAV is based on the average of the previous four quarter-end NAVs per share prior to each declaration date.

Electronic Delivery of Shareholder Reports

The Fund offers shareholders the benefits and convenience of viewing Quarterly and Annual Reports and other shareholder materials online. With your consent, paper copies of these documents will cease with the next mailing and will be provided via e-mail. Reduce paper mailed to your home and help lower the Fund’s printing and mailing costs. To enroll, registered shareholders with the Fund’s transfer agent, Computershare, should call 866-723-8330, or log in to their account to update e-delivery preferences.

Shareholders using brokerage accounts should contact their broker.

Privacy Policy

In order to conduct its business, the Fund, through Computershare, collects and maintains certain nonpublic personal information about our registered shareholders with respect to their transactions in shares of our Fund. This information includes the shareholder’s address, tax identification or Social Security number, share balances, and dividend elections. We do not collect or maintain personal information about shareholders whose shares of our securities are held in “street” or brokerage accounts.

We do not disclose any nonpublic personal information about you, our other shareholders, or our former shareholders to third parties unless necessary to process a transaction, service an account, or as otherwise permitted by law.

To protect your personal information internally, we restrict access to nonpublic personal information about our registered shareholders to those employees who need to know that information to provide services to such shareholders. We also maintain certain other safeguards to protect your nonpublic personal information.

Proxy Voting Policies and Record

A description of the policies and procedures that the Fund uses to determine how to vote proxies relating to portfolio securities owned by the Fund and the Fund’s proxy voting record for the 12-month period ended June 30, 2025 are available (i) without charge, upon request, by calling the Fund’s toll free number at (800) 638-2479; (ii) on the Fund’s website: www.adamsfunds.com; and (iii) on the Securities and Exchange Commission’s website: www.sec.gov.

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Other Information  (continued)

(unaudited)

Statement on Quarterly Filing of Complete Portfolio Schedule

In addition to publishing its complete schedule of portfolio holdings in the First and Third Quarter Reports to Shareholders, the Fund also files its complete schedule of portfolio holdings for the first and third quarters of each fiscal year with the Securities and Exchange Commission on Form N-PORT. The form is available on the Commission’s website: www.sec.gov. The Fund also posts a link to its filings on its website: www.adamsfunds.com.

Direct Stock Purchase Plan

The Fund offers a direct stock purchase plan (“Plan”) sponsored and administered by Computershare. The Plan provides registered shareholders and interested first time investors an affordable alternative for buying and selling Fund shares. A brochure which further details the benefits and features of the Plan as well as an enrollment form may be obtained by visiting www.computershare.com/investor or by contacting Computershare at 866-723-8330 (or 1-781-575-2879 if outside the U.S. or Canada).

The costs to participants in administrative service fees and brokerage commissions for each type of transaction are listed below. Fees are subject to change at any time.

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Directors

The address for each Director is the Fund’s office. Mr. Haynie is an interested person because he serves as the Fund’s Chief Executive Officer.

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Officers

All officers serve until the time at which their successor is elected and qualified, unless they earlier resign, die, or are removed by the Board of Directors. The address for each officer is the Fund’s office.

Service Providers

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Please visit our website
adamsfunds.com