FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number: 811-02736
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ADAMS NATURAL RESOURCES FUND, INC.
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(Exact name of registrant as specified in charter)

500 East Pratt Street, Suite 1300, Baltimore, Maryland 21202
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(Address of principal executive offices)

Lawrence L. Hooper, Jr.
Adams Natural Resources Fund, Inc.
500 East Pratt Street, Suite 1300
Baltimore, Maryland 21202
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(Name and address of agent for service)

Registrant's telephone number, including area code: (410) 752-5900
Date of fiscal year end: December 31
Date of reporting period: June 30, 2017

Item 1. Reports to Stockholders.

ADAMS NATURAL RESOURCES FUND

SEMI-ANNUAL REPORT

JUNE 30, 2017

LETTER TO SHAREHOLDERS

Dear Fellow Shareholders,

The year started off strong with the broad stock market generating solid gains driven by continued confidence in the ongoing economic recovery and expectations stemming from the proposed pro-business policies of the Trump administration. The strength of the economy, particularly the labor market, led the Federal Reserve to raise short-term interest rates a quarter point at both its March and June meetings. The stock market continued to move higher, reaching record levels during the second quarter despite signs that it will take longer than expected to realize the potential benefits from proposed policies on tax reform, health care, and infrastructure spending.

The Energy sector did not participate in the gains of the broader markets due to lower oil and gas prices. Energy was the worst performing sector in the S&P 500, declining 12.6% in the first six months of 2017. Your Fund, which was down 9.5% during the period, benefited from exposure to Basic Materials stocks and diversification across Energy that together helped to mitigate the deterioration in oil and gas stock prices.

Crude oil (WTI) prices fell 20% from the beginning of the year, hitting a 10-month low of $42.31 in June. This correction marked the largest decline for the first half of the year in 20 years. The decline was driven by oversupply concerns as already high U.S. crude oil inventory levels were met with rising production. OPEC’s decision in November 2016 to curtail production had little impact on prices, as U.S. shale production largely offset the OPEC cuts. Advances in technology have enabled American shale drillers to be profitable at significantly lower oil prices. Also, Libya ramped production to a three-year high after resolving supply disruptions earlier in the year, contributing to the oversupplied condition. U.S. crude inventories continued to rise despite OPEC’s announcement in May to extend cuts through March 2018.

The Dow Jones U.S. Oil & Gas Index declined 13.4% in the first six months of the year. Within the sector, integrated oil and gas companies declined 9.2%, while oil service stocks declined 20.0%. Exploration & production (E&P) companies declined 19.7%. The Dow Jones U.S. Basic Materials Index rose 8.6%, led by chemical stocks, which benefited from strength in the automotive and housing sectors.

Within the E&P industry, we adjusted the portfolio to reflect our preference for pure-play companies with exposure to U.S. shale production, particularly in the Permian basin, a drilling field in West Texas. We initiated positions in Diamondback Energy, Energen Corporation, and Parsley Energy. These companies have strong, low-cost asset bases, enabling each to profitably operate wells at relatively low oil prices. In addition, these companies are positioned well with high-quality balance sheets, strong management teams, and significant room for production growth. These purchases were funded with proceeds from the sale of the Fund’s position in Anadarko Petroleum. We sold the stock following a well explosion in April that has the potential to adversely impact drilling restrictions in the Colorado market.

Drillers were the worst performing industry, declining 38.0% during the period. Concerns over the longer-term implications of low oil prices were most pronounced on the shares of offshore drillers. We had no exposure to these stocks.

The Fund’s Basic Materials exposure performed well, increasing 9.4% and exceeding its benchmark. The best performer in the group was Packaging Corporation of America, which benefited from strong containerboard pricing and continued synergies from prior acquisitions. Coatings and materials company PPG Industries reported solid volume and margin gains and contributed to our positive returns in the sector. Despite PPG’s unsuccessful attempts to acquire Dutch competitor Akzo Nobel, we view PPG as a

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LETTER TO SHAREHOLDERS (CONTINUED)

compelling investment given its leadership position in the global paints and coatings market combined with its significant cash position. We believe that PPG is committed to using its strong balance sheet to create shareholder value through M&A and/or share buybacks.

For the six months ended June 30, 2017, the total return on the Fund’s net asset value (“NAV”) per share (with dividends and capital gains reinvested) was -9.5%. This compares to total returns of -13.4% for Dow Jones U.S. Oil & Gas Index, 8.6% for Dow Jones U.S. Basic Materials Index, and -6.9% for Lipper Global Natural Resources Funds Average over the same time period. The total return on the market price of the Fund’s shares for the period was -6.3%.

For the twelve months ended June 30, 2017, the Fund’s total return on NAV was -0.2%. Comparable returns for Dow Jones U.S. Oil & Gas Index, Dow Jones U.S. Basic Materials Index, and Lipper Global Natural Resources Funds Average were -5.0%, 20.3%, and 1.7%, respectively. The Fund’s total return on market price was -1.7%.

During the first half of this year, the Fund paid distributions to shareholders in the amount of $5.7 million, or $.20 per share, consisting of $.04 net investment income and $.04 long-term capital gain, realized in 2016, and $.12 of net investment income realized in 2017, all taxable in 2017. On July 13, 2017, an additional net investment income distribution of $.10 per share was declared for payment on September 1, 2017. These constitute the first three payments toward our annual 6% minimum distribution rate commitment.

On June 8, 2017, Ms. Nancy J. Floyd Prue retired from the Fund after 35 years of service. Ms. Prue held a variety of senior-level positions at Adams Funds and served as President of PEO from 2012 to 2015. Most recently, she served as Executive Vice President and Director of Shareholder Communications. We thank her for the many contributions she made over the years and wish her well in retirement.

By order of the Board of Directors,

Mark E. Stoeckle

Chief Executive Officer

July 13, 2017

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.

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PORTFOLIO HIGHLIGHTS

June 30, 2017

(unaudited)

Ten Largest Equity Portfolio Holdings

Industry Weightings

3

STATEMENT OF ASSETS AND LIABILITIES

June 30, 2017

(unaudited)

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

4

STATEMENT OF OPERATIONS

Six Months Ended June 30, 2017

(unaudited)

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

5

STATEMENTS OF CHANGES IN NET ASSETS

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

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NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

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. The investment objectives of the Fund 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 accompanying financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for investment companies, 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.

Affiliates—Adams Diversified Equity Fund, Inc. (“ADX”), a diversified, closed-end investment company, owns 8% of the Fund’s outstanding shares and is, therefore, an “affiliated company” as defined by the 1940 Act. During 2017, the Fund paid dividends and long-term capital gain distributions of $437,355 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.

Expenses—The Fund shares personnel, systems, and other infrastructure items with ADX and AFA and are 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 percentage 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. 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 time spent for portfolio managers, relative market values of portfolio securities covered for research staff, and relative net assets for all others. Expense allocations are updated quarterly, except for those related to payroll, which are updated annually. Estimates related to time spent are reviewed on an annual basis, or more frequently if warranted by a change in job function.

For the period ended June 30, 2017, expenses of $1,246,306 and $335,633 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 as of June 30, 2017.

Investment Transactions, Investment Income, and Distributions—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, ADX, and AFA to protect the Fund from potential conflicts of interest. Investment transactions are accounted for on

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NOTES TO FINANCIAL STATEMENTS (CONTINUED)

trade date. Realized gains and losses on sales of investments are recorded on the basis of specific identification. Dividend income and distributions to shareholders are recognized on the ex-dividend date. Interest income is recognized on the accrual basis.

Valuation—The Fund’s financial instruments are reported at fair value, which is defined as the price that would be received to sell 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 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 fair value hierarchy that categorizes the inputs used to measure fair value:

Investments in securities traded on national security 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 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.

Short-term investments (excluding money market funds) are valued at amortized cost, which approximates fair value. 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.

At June 30, 2017, the Fund’s financial instruments were classified as follows:

There were no transfers between levels during the period ended June 30, 2017.

Recent Accounting Pronouncement—In October 2016, the U.S. Securities and Exchange Commission adopted new rules and amended existing rules (together, the “final rules”) intended to modernize the reporting and disclosure of information by registered investment companies. In part, the final rules amend Regulation S-X and

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NOTES TO FINANCIAL STATEMENTS (CONTINUED)

require standardized, enhanced disclosure about derivatives in investment company financial statements, as well as other amendments. The compliance date for the amendments to Regulation S-X is August 1, 2017. Management is currently evaluating the impact that the adoption of the amendments to Regulation S-X will have on the Fund’s financial statements and related disclosures.

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 and concluded that tax positions included in federal income tax returns from the previous three years that remain subject to examination do not require any provision. Any income tax-related interest or penalties would be recognized as income tax expense. As of June 30, 2017, the identified cost of securities for federal income tax purposes was $553,391,508 and net unrealized appreciation aggregated $128,333,108, consisting of gross unrealized appreciation of $182,130,490 and gross unrealized depreciation of $53,797,382.

Distributions are determined in accordance with the Fund’s annual 6% minimum distribution rate commitment, based on the Fund’s average market price, and income tax regulations, which may differ from generally accepted accounting principles. Such differences are primarily related to the Fund’s retirement plans and equity-based compensation. Differences that are permanent are reclassified in the capital accounts of the Fund’s financial statements and have no impact on net assets.

3.    INVESTMENT TRANSACTIONS

Purchases and sales of portfolio investments, other than short-term investments and derivative transactions, during the period ended June 30, 2017 were $73,893,549 and $65,952,117 respectively.

4.     DERIVATIVES

During the period ended June 30, 2017, the Fund invested in derivative instruments. The Fund may use derivatives for a variety of purposes, including, but not limited to, the ability to obtain leverage, to gain or limit exposure to particular market sectors or securities, to provide additional income, and/or to limit equity price risk in the normal course of pursuing its investment objectives. The financial derivative instruments outstanding as of period-end and the amounts of realized gains and losses and changes in unrealized gains and losses on financial derivative instruments during the period indicate the volume of financial derivative activity for the period.

Total Return Swap Agreements—The Fund may use total return swap agreements to manage exposure to certain risks and/or to enhance performance. Total return swap agreements are bilateral contracts between the Fund and a counterparty in which the Fund, in the case of a long contract, agrees to receive the positive total return (and pay the negative total return) of an underlying equity security and to receive or pay a financing amount, based on a notional amount and a referenced interest rate, over the term of the contract. In the case of a short contract, the Fund agrees to pay the positive total return (and receive the negative total return) of the underlying equity security and

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NOTES TO FINANCIAL STATEMENTS (CONTINUED)

to receive or pay a financing rate, based on a notional amount and a referenced interest rate, over the term of the contract. The fair value of each total return swap agreement is determined daily with the change in the fair value recorded as an unrealized gain or loss in the Statement of Operations. Upon termination of a swap agreement, the Fund recognizes a realized gain (loss) on total return swap agreements in the Statement of Operations equal to the net receivable (payable) amount under the terms of the agreement.

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 underlying equity 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 contract prior to termination date and to net amounts due across multiple contracts upon settlement, providing for a single net settlement with a counterparty. Pursuant to master netting arrangements, the net cumulative unrealized gain (asset) on open total return swap agreements and net cumulative unrealized loss (liability) on open total return swap agreements are presented in the Statement of Assets and Liabilities. The Fund’s policy is to net all derivative instruments subject to a netting agreement. The fair value of each outstanding total return swap contract is presented on the Schedule of Investments.

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 contract. 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. As of June 30, 2017, securities, as denoted on the Schedule of Investments, with a value of $2,697,810 were pledged by the Fund, providing $1,348,905 in collateral value after the required valuation allowance was applied. No cash collateral was held by the Fund as of June 30, 2017.

5.    CAPITAL STOCK

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

During the period ended June 30, 2017, the Fund issued 145 shares of its Common Stock at a weighted average price of $19.51 per share as dividend equivalents to holders of deferred stock units under the 2005 Equity Income Compensation Plan.

On December 23, 2016, the Fund issued 462,680 shares of its Common Stock at a price of $20.66 per share (the average market price on December 12, 2016) to shareholders of record on November 25, 2016, who elected to take stock in payment of the year-end distribution from 2016 capital gain and investment income. During 2016, the Fund issued 765 shares of its Common Stock at a weighted average price of $20.08 per share as dividend equivalents to holders of deferred stock units under the 2005 Equity Income 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 may deem appropriate. There were no shares repurchased

10

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

by the Fund in 2017 or 2016. Transactions in Common Stock for 2017 and 2016 were as follows:

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 2017, the Fund recorded matching contributions of $83,520. As of June 30, 2017, the Fund recorded a liability in the amount of $52,841, included in Accrued expenses and other liabilities in the accompanying Statement of Assets and Liabilities, representing the 2017 discretionary contribution.

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 awards granted prior to the Plan’s expiration remain outstanding as of June 30, 2017 and vest on various dates through September 2, 2018, provided the service condition set forth in the award at grant is satisfied. Also outstanding are restricted stock units granted to nonemployee directors that are 100% vested, but payment of which has been deferred at the election of the director.

Outstanding awards were granted at fair market value on grant date (determined by the average of the high and low price on that date). Awards earn an amount equal to the Fund’s per share distribution, payable in either cash (employees) or reinvested shares (non-employee directors). Reinvested shares are fully vested and paid concurrently with the payment of the original share grant. A summary of the activity related to nonvested restricted shares and deferred stock units for the period ended June 30, 2017 is as follows:

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NOTES TO FINANCIAL STATEMENTS (CONTINUED)

Compensation cost is based on the fair market value of the award on grant date and recognized on a straight-line basis over the vesting period. Any compensation cost recognized related to an award that is subsequently forfeited due to unmet service conditions is reversed. Total compensation cost related to equity-based compensation for the period ended June 30, 2017 was $101,833. As of June 30, 2017, the Fund had unrecognized compensation cost of $71,553, a component of additional capital surplus, related to nonvested awards that will be recognized over a weighted average period of 0.51 years. The total fair value of awards vested and issued during the period ended June 30, 2017 was $259,079.

8.    OFFICER AND DIRECTOR COMPENSATION

The aggregate remuneration paid by the Fund during the period ended June 30, 2017 to officers and directors amounted to $2,299,071, of which $221,250 was paid to directors who were not officers. These amounts represent the taxable income 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.

9.    PORTFOLIO SECURITIES LOANED

The Fund makes loans of securities to approved brokers to earn additional income. It receives as collateral cash deposits 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. Cash deposits are placed 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 the securities loaned that may occur during the term of the loan will be for the account of the Fund. At June 30, 2017, the Fund had securities on loan of $64,366,264 and held cash collateral of $66,068,663. The 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.    OPERATING LEASE COMMITMENTS

The Fund and its affiliated companies lease office space and equipment under operating lease agreements expiring at various dates through the year 2026. The Fund recognized rental expense of $63,555 for the period ended June 30, 2017, and its estimated portion of the minimum rental commitments are as follows:

12

FINANCIAL HIGHLIGHTS

13

SCHEDULE OF INVESTMENTS

June 30, 2017

(unaudited)

14

SCHEDULE OF INVESTMENTS (CONTINUED)

June 30, 2017

(unaudited)

15

SCHEDULE OF INVESTMENTS (CONTINUED)

June 30, 2017

(unaudited)

Notes:

16

PRINCIPAL CHANGES IN PORTFOLIO SECURITIES

During the six months ended June 30, 2017

(unaudited)

17

HISTORICAL FINANCIAL STATISTICS

(unaudited)