UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

CARBO Ceramics Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

140781105

(CUSIP Number)

Morgan D. Neff

Wilks Brothers, LLC

17010 IH 20

Cisco, Texas 76437

(817) 850-3600

Matt Wilks

Wilks Brothers, LLC

17010 IH 20

Cisco, Texas 76437

817-850-3600

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

March 2, 2017

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box  ☒.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See 240.13d-7(b) for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

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575 North Dairy Ashford, Suite 300

Houston, TX 77079

This Schedule 13D is being filed by the following persons, each of whom is referred to herein as a “Reporting Person” and collectively as the “Reporting Persons”:

Wilks Brothers, LLC (“Wilks Brothers”), a Texas limited liability company

Dan H. Wilks, a United States citizen

Staci Wilks, a United States citizen

Farris Wilks, a United States citizen

Dan H. Wilks’ present principal occupation or employment is self-employed investor.

Staci Wilks’ present principal occupation or employment is self-employed investor.

Farris Wilks’ present principal occupation or employment is self-employed investor.

The principal business of Wilks Brothers is investing in securities. Wilks Brothers is a manager-managed limited liability company, managed by Dan H. Wilks and Farris Wilks.

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Item 3 of the prior 13D is hereby amended by adding the following:

As of the date hereof, the Reporting Persons have acquired an additional 17,500 shares of Common Stock for an aggregate purchase price of $225,050 including brokerage commissions.

Item 4 of the prior 13D is hereby amended by adding the following:

On March 2, 2017, the Issuer entered into an Amended and Restated Credit Agreement (the “New Credit Agreement”) with Wilks Brothers to replace its current term loan with Wells Fargo Bank, National Association. The New Credit Agreement is a $65.0 million facility maturing on December 31, 2022, that consists of a $52,651,000 term loan made at closing to pay off Wells Fargo and an additional term loan of $12,349,000 to be made in a single advance to the Issuer upon the satisfaction of certain post-closing conditions. The Issuer’s obligations bear interest at 9.00% and are guaranteed by its two domestic operating subsidiaries. No principal repayments are required until maturity (except in unusual circumstances), and there are no financial covenants. In lieu of making cash interest payments, the Issuer has the option during the first two years of the loan to make interest payments as payment-in-kind, or PIK, by applying an 11.00% rate to the interest payment due (instead of the 9.00% cash interest rate) and capitalizing the resulting amount to the outstanding principal balance of the loan. The loan cannot be prepaid during the first three years without making Wilks Brothers whole for interest that would have been payable over the entire remaining term of the loan. The Issuer’s obligations under the New Credit Agreement are secured by: (i) a pledge of all accounts receivable and inventory, (ii) cash in certain accounts, (iii) domestic distribution assets residing on owned real property, (iv) the Issuer’s Marshfield, Wisconsin and Toomsboro, Georgia plant facilities and equipment, and (v) certain real property interests in mines and minerals. The foregoing description of the New Credit Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the New Credit Agreement, attached hereto as Exhibit 99.7 which is incorporated herein by reference.

On March 2, 2017, in connection with entry into the New Credit Agreement, the Issuer issued a Warrant (the “Warrant”) to Wilks Brothers. Subject to the terms of the Warrant, the Warrant entitles the holder thereof to purchase up to 523,022 shares of the Common Stock, at an exercise price of $14.91 per share, payable in cash. The Warrant expires at 11:59 p.m., New York City time, on December 31, 2022. Until receipt of the Stockholder Approval, the holder of the Warrant shall not be entitled to exercise the Warrant to the extent that the number of shares of Common Stock to be purchased upon such exercise, plus the number of shares of Common Stock purchased on any prior exercise of the Warrant, exceeds 271,414 shares of Common Stock (which amount represents approximately 1% of the number of shares of Common Stock currently outstanding). The foregoing description of the Warrant does not purport to be complete and is qualified in its entirety by reference to the full text of the Warrant, attached hereto as Exhibit 99.8, which is incorporated herein by reference.

In connection with entry into the New Credit Agreement and the issuance of the Warrant, the Issuer entered into a letter agreement (the “Letter Agreement”), dated as of March 2, 2017, by and among the Issuer, Wilks Brothers, and certain directors and officers of the Issuer holding approximately 14.8% of the Issuer’s outstanding common shares (collectively, the “Supporting Stockholders”). Under the terms

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of the Letter Agreement, Wilks Brothers has agreed to not acquire, offer to acquire or agree to acquire any of the Issuer’s Common Stock if the acquisition would result in Wilks Brothers and its affiliates owning more than 15% of the Common Stock then outstanding. Wilks Brothers and the Issuer also agreed to certain other customary standstill provisions, which remain in effect until six months after the Wilks Brothers and its affiliates own less than 5% of the Common Stock.

In addition, the Issuer has agreed to submit a proposal seeking the approval (the “Stockholder Approval”), by an affirmative vote of the holders of a majority of the votes cast of the Common Stock, of the issuance of 523,022 shares of Common Stock to Wilks Brothers upon exercise of the Warrant. The New York Stock Exchange requires the approval of the Issuer’s stockholders of the issuance of an amount of shares of the Common Stock, or securities convertible into Common Stock, that exceeds more than 1% of the Common Stock outstanding, to a stockholder of the Issuer who holds more than 5% of the Common Stock outstanding before such issuance, such as Wilks Brothers. Under the Letter Agreement, the Supporting Stockholders have agreed to vote in favor of the Stockholder Approval.

The Issuer has also granted Wilks certain registration rights pursuant to a Registration Rights Agreement (the “Registration Rights Agreement”), dated as of March 2, 2017, with respect to the shares of Common Stock issuable upon exercise of the Warrant, which rights include demand rights and piggy-back registration rights, subject to certain exceptions and limitations. The foregoing description of the Letter Agreement and Registration Rights Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the respective agreements, attached hereto as Exhibits 99.9 and 99.10, respectively, which are incorporated herein by reference.

(a) The Reporting Persons may be deemed to beneficially own, in the aggregate, 2,594,733 shares of Common Stock, representing approximately 9.5% of the Issuer’s issued and outstanding shares of Common Stock, based on 27,142,528 shares of Common Stock of the Issuer issued and outstanding as February 17, 2017, as set forth in the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2016, filed with the SEC on March 1, 2017 and including 27,414 shares of Common Stock of the Issuer currently issuable upon exercise of the Warrant. See Item 4 of this Schedule 13D.

Dan Wilks and Staci Wilks each beneficially own 1,000,143 shares of Common Stock, representing 3.7% of the Issuer’s issued and outstanding Common Stock. Wilks Brothers beneficially owns 1,594,590 shares of Common Stock, representing 5.8% of the Issuer’s issued and outstanding Common Stock. Dan Wilks and Farris Wilks may be deemed to indirectly beneficially own the 1,594,590 shares of Common Stock directly beneficially owned by Wilks Brothers. Dan Wilks and Staci Wilks are husband and wife, and may be deemed to beneficially own the shares of Common Stock beneficially owned by the other person. Dan Wilks and Farris Wilks are brothers, and may and may be deemed to beneficially own the shares of Common Stock beneficially owned by the other person.

(b) Dan Wilks and Staci Wilks each have shared power to vote and power to dispose of 1,000,143 shares of Common Stock. Wilks Brothers has sole power to vote and power to dispose of 1,594,590 shares of Common Stock. Dan Wilks and Farris Wilks may be deemed to indirectly have the power to direct the voting and the power to direct the disposition of the 1,594,590 shares of Common Stock directly beneficially owned by Wilks Brothers.

(c) Except as set forth above in Item 4 of this Schedule 13D, no transactions were effected in the Common Stock within the past 60 days by the Reporting Persons or their general partners or managers.

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Item 6 of the prior 13D is hereby amended by adding the following:

On December 6, 2016, Wilks Brothers sold short 6,325 over the counter market American-style put options referencing 632,500 shares of Common Stock, which have a strike price of $14.00 and expire on June 16, 2017.

None of the Reporting Persons has any contracts, arrangements, understandings or relationships with respect to the securities of the Issuer, except as set forth above in Item 4 and Item 6 of this Schedule 13D.

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After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative (other than an executive officer or general partner of this filing person), evidence of the representative’s authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001).

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EXHIBIT INDEX

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Exhibit 99.1

IDENTIFICATION OF MEMBERS OF THE GROUP

Dan H. Wilks

Staci Wilks

Farris Wilks

Wilks Brothers, LLC

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Exhibit 99.2

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the common stock, par value $0.01 per share, of CARBO Ceramics, Inc., a Delaware corporation, and further agree that this Joint Filing Agreement be included as an exhibit to such joint filings. In evidence thereof, each of the undersigned hereby executes this Joint Filing Agreement as of March 10, 2017.

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Exhibit 99.3

POWER OF ATTORNEY

FOR EXECUTING FORMS 3, FORMS 4 AND FORMS 5,

FORM 144 AND SCHEDULE 13D AND 13G

The undersigned hereby constitutes and appoints each of Matt Wilks and Morgan Neff with full power of substitution, as the undersigned’s true and lawful attorney-in-fact to:

The undersigned hereby grants to the attorney-in-fact full power and authority to do and perform all and every act requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that the attorney-in-fact shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers granted herein.

This Power of Attorney shall remain in full force and effect until the undersigned revokes this Power of Attorney in a signed writing delivered to the attorney-in-fact. This Power of Attorney does not revoke any other power of attorney that the undersigned has previously granted.

IN WITNESS WHEREOF, the undersigned have caused this Power of Attorney to be executed as of the date first written above.

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Exhibit 99.4

POWER OF ATTORNEY

FOR EXECUTING FORMS 3, FORMS 4 AND FORMS 5,

FORM 144 AND SCHEDULE 13D AND 13G

The undersigned hereby constitutes and appoints each of Matt Wilks and Morgan Neff with full power of substitution, as the undersigned’s true and lawful attorney-in-fact to:

The undersigned hereby grants to the attorney-in-fact full power and authority to do and perform all and every act requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that the attorney-in-fact shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers granted herein.

This Power of Attorney shall remain in full force and effect until the undersigned revokes this Power of Attorney in a signed writing delivered to the attorney-in-fact. This Power of Attorney does not revoke any other power of attorney that the undersigned has previously granted.

IN WITNESS WHEREOF, the undersigned have caused this Power of Attorney to be executed as of the date first written above.

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Exhibit 99.5

POWER OF ATTORNEY

FOR EXECUTING FORMS 3, FORMS 4 AND FORMS 5,

FORM 144 AND SCHEDULE 13D AND 13G

The undersigned hereby constitutes and appoints each of Matt Wilks and Morgan Neff with full power of substitution, as the undersigned’s true and lawful attorney-in-fact to:

The undersigned hereby grants to the attorney-in-fact full power and authority to do and perform all and every act requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that the attorney-in-fact shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers granted herein.

This Power of Attorney shall remain in full force and effect until the undersigned revokes this Power of Attorney in a signed writing delivered to the attorney-in-fact. This Power of Attorney does not revoke any other power of attorney that the undersigned has previously granted.

IN WITNESS WHEREOF, the undersigned have caused this Power of Attorney to be executed as of the date first written above.

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Exhibit 99.6

POWER OF ATTORNEY

FOR EXECUTING FORMS 3, FORMS 4 AND FORMS 5,

FORM 144 AND SCHEDULE 13D AND 13G

The undersigned hereby constitutes and appoints each of Matt Wilks and Morgan Neff with full power of substitution, as the undersigned’s true and lawful attorney-in-fact to:

The undersigned hereby grants to the attorney-in-fact full power and authority to do and perform all and every act requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that the attorney-in-fact shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers granted herein.

This Power of Attorney shall remain in full force and effect until the undersigned revokes this Power of Attorney in a signed writing delivered to the attorney-in-fact. This Power of Attorney does not revoke any other power of attorney that the undersigned has previously granted.

IN WITNESS WHEREOF, the undersigned have caused this Power of Attorney to be executed as of the date first written above.