Exhibit 99(a)(1)(B)

LETTER OF TRANSMITTAL

PURSUANT TO THE OFFER TO PURCHASE DATED MARCH 15, 2017

THE OFFER WILL EXPIRE AT 11:59 P.M., EASTERN TIME, ON

April 11, 2017, UNLESS THE OFFER IS EXTENDED

Any questions concerning the offer or this Letter of Transmittal can be directed to the following address:

Owl Rock Capital Corporation

Attn: Bryan Cole

245 Park Avenue, 41st Floor

New York, New York 10167

Delivery of this Letter of Transmittal and all other documents to an address other than as set forth above will not constitute a valid delivery to Owl Rock Capital Corporation (“Owl Rock” or the “Company”).

The offer to purchase and this entire Letter of Transmittal, including the accompanying instructions, should be read carefully before this Letter of Transmittal is completed.

IF YOU WANT TO RETAIN ALL OF YOUR SHARES, YOU DO NOT NEED TO TAKE ANY ACTION.

LETTER OF TRANSMITTAL (continued)

Ladies and Gentlemen:

This Letter of Transmittal is provided in connection with the Company’s offer (the “Offer to Purchase”) dated March 15, 2017 to purchase up to the number of shares of the Company’s common stock, par value $0.01 per share (“Common Stock”) that can be repurchased with $50 million. The term “Shares” as used herein refers only to those shares of Common Stock that are eligible to be repurchased. The Company is an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a business development company under the Investment Company Act of 1940, as amended, and is incorporated in the State of Maryland. The person(s) signing this Letter of Transmittal (the “Signatory”) hereby tender(s) to the Company the number of Shares specified below in Section B “Number of Shares Being Tendered” for purchase by the Company at a price equal to the net asset value (“NAV”) per share of the Company’s Common Stock determined as of April 12, 2017 (the “Purchase Price”), in cash, under the terms and subject to the conditions set forth in the Offer to Purchase, receipt of which is hereby acknowledged, and in this Letter of Transmittal (which Offer to Purchase and Letter of Transmittal, together with any amendments or supplements hereto and thereto, collectively constitute the “Offer”). The Offer will expire at 11:59 P.M., Eastern Time, on April 11, 2017 (the “Expiration Date”), unless extended.

Subject to, and effective upon, acceptance for payment for the Shares tendered herewith, in accordance with the terms and subject to the conditions of the Offer, the Signatory hereby sells, assigns and transfers to, or upon the order of, the Company, all right, title and interest in and to all of the Shares that are being tendered hereby that are purchased pursuant to the Offer.

The name(s) of the registered holder(s) on this Letter of Transmittal must correspond exactly with the name(s) on the subscription agreement accepted by the Company in connection with such registered holder(s)’ capital commitment (“Capital Commitment”) to the Company, unless such registered holder(s)’ Shares have been transferred, in which event the name(s) of the holder(s) on this Letter of Transmittal must correspond exactly with the name of the last transferee indicated on the stock ledger maintained in book-entry form by State Street Bank and Trust Company, the Company’s transfer agent.

The Signatory recognizes that, under certain circumstances as set forth in the Offer to Purchase, the Company may amend, extend or terminate the Offer or may not be required to purchase any of the Shares tendered hereby. In any such event, the Signatory understands that the Shares not purchased, if any, will continue to be held by the Signatory and will not be tendered.

The Signatory understands that acceptance of Shares by the Company for payment will constitute a binding agreement between the Signatory and the Company upon the terms and subject to the conditions of the Offer.

The Signatory understands that the payment of the Purchase Price for the Shares accepted for purchase by the Company will be made by the Company within ten business days following the conclusion of the Offer, or as soon as practicable thereafter, and that in no event will the Signatory receive any interest on the Purchase Price. Payment of the Purchase Price for the Shares tendered by the Signatory will be made on behalf of the Company by check or wire transfer to the account identified by the Signatory below.

If the Signatory participates in the Company’s distribution reinvestment plan, the Signatory will continue to participate in the distribution reinvestment plan unless the Company is otherwise notified by the Signatory.

Notwithstanding the foregoing, if the Signatory tenders all of their Shares in the Offer (whether or not the Company accepts all such Shares for payment pursuant to the Offer), the Signatory’s participation in the distribution reinvestment plan will automatically cease with respect to distributions scheduled to be paid after the Expiration Date.

All authority herein conferred or agreed to be conferred shall survive the death or incapacity of the Signatory and all obligations of the Signatory hereunder shall be binding upon the heirs, personal representatives, successors and assigns of the Signatory. Except as stated in the Offer to Purchase, this tender is irrevocable.

The Signatory hereby acknowledges that capitalized terms not defined in this Letter of Transmittal shall have the meanings ascribed to them in the Offer to Purchase.

TENDER AUTHORIZATION FORM

A.    SHAREHOLDER(S) INFORMATION

Beneficial Owner(s) Information

Shares are held through an individual retirement account or other qualified pension account:    ☐  Yes    ☐  No

Registered Holder Information (if different than above; print name exactly as it appears on the subscription agreement or as indicated on the stock ledger maintained by the Company’s transfer agent)*

This Owl Rock Tender Authorization Form is valid only in conjunction with the terms of the Offer to Purchase dated March 15, 2017.

B.    NUMBER OF SHARES BEING TENDERED (select one option)

C.    REMITTANCE INFORMATION (select one option, if applicable)

If no option is selected, (i) all proceeds from tenders processed for custodial accounts will be remitted to the custodian and (ii) all proceeds from tenders processed for non-custodial accounts will be remitted to the address of record for the owner(s).

This Owl Rock Tender Authorization Form is valid only in conjunction with the terms of the Offer to Purchase dated March 15, 2017.

D.    COST BASIS INFORMATION (information required for tax reporting purposes)

Per the Internal Revenue Service (“IRS”) regulation “Basis Reporting by Securities Brokers and Basis Determination for Stock,” the Company is required to know the cost accounting method the owner(s) would like the Company to use in calculating the gain or loss associated with this Offer. If the owner(s) does not provide this information, the Company will use its chosen default method, First-In, First-Out (FIFO). Note that the Company’s default method may not be the most tax advantageous method. The owner(s) may want to consult their financial advisor or tax professional before completing this section.

Select one option then complete the additional information requested, if applicable:

☐  First-In, First-Out (FIFO)

First-In, First-Out uses the first lots purchased into the account to determine the cost basis of the Shares and to calculate the gain or loss.

☐  Specific Share Identification

Specific Share Identification allows the owner(s) to select the Shares from any purchase or reinvested lot that has not previously been sold. Indicate in the table below the number of Shares and date of purchase for each lot to be repurchased in this transaction. To the extent all Shares tendered are not accepted by the Company, the Company will use the Shares listed in the first row of the table and proceed to the next row(s) as necessary until all Shares accepted by the Company are accounted.

This Owl Rock Tender Authorization Form is valid only in conjunction with the terms of the Offer to Purchase dated March 15, 2017.

E.    SIGNATURE    (all registered holders must sign)

The Signatory authorizes and instructs the Company to make a cash payment (payable by check or wire transfer) of the Purchase Price for Shares accepted for purchase by the Company, without interest thereon and less any applicable withholding taxes, to which the Signatory is entitled in accordance with the instructions in Section C “Remittance Information” above. By executing this Letter of Transmittal, the Signatory hereby delivers to the Company in connection with the Offer to Purchase the number of Shares indicated in Section B “Number of Shares Being Tendered” above.

If Shares are registered in the name of a custodian, the custodian of the Shares must execute this Letter of Transmittal, and the beneficial owner of the Shares hereby authorizes and directs the custodian of the Shares to execute this Letter of Transmittal.

Beneficial Owner Signature:

This Owl Rock Tender Authorization Form is valid only in conjunction with the terms of the Offer to Purchase dated March 15, 2017.

INSTRUCTIONS TO LETTER OF TRANSMITTAL

THESE INSTRUCTIONS FORM PART OF THE TERMS AND CONDITIONS OF THIS LETTER OF TRANSMITTAL

1. Delivery of Letter of Transmittal. This Letter of Transmittal, properly completed and duly executed, should be sent by mail or courier or delivered by personal delivery to the Company in each case at the address set forth on the front page of this Letter of Transmittal, in order to make an effective tender.

A properly completed and duly executed Letter of Transmittal must be received by the Company at the address set forth on the front page of this Letter of Transmittal by 11:59 P.M., Eastern Time, on April 11, 2017, unless the Offer is extended. The Purchase Price will be paid and issued in exchange for the Shares tendered and accepted for purchase by the Company pursuant to the Offer to Purchase in all cases only after receipt by the Company of a properly completed and duly executed Letter of Transmittal.

The method of delivery of all documents is at the option and risk of the Signatory and the delivery will be deemed made only when actually received. If delivery is by mail, registered mail with return receipt requested, properly insured, is recommended.

2. Signatures on this Letter of Transmittal, Powers of Attorney and Endorsements.

(a) If this Letter of Transmittal is signed by the registered holder(s) of the Shares to be tendered, the signature(s) of the holder on this Letter of Transmittal must correspond exactly with the name(s) on the subscription agreement accepted by the Company in connection with the purchase of the Shares, unless such Shares have been transferred by the registered holder(s), in which event this Letter of Transmittal must be signed in exactly the same form as the name of the last transferee indicated on the stock ledger maintained in book-entry form by State Street Bank and Trust Company, the Company’s transfer agent.

(b) If any Shares tendered with this Letter of Transmittal are owned of record by two or more joint owners, all such owners must sign this Letter of Transmittal.

(c) If this Letter of Transmittal is signed by a director, executor, administrator, guardian, attorney-in-fact, officer of a corporation or other person acting in a fiduciary or representative capacity, such person must so indicate when signing, and proper evidence satisfactory to the Company of such person’s authority to so act must be submitted.

3. Withholding. The Company is entitled to deduct and withhold from the Purchase Price otherwise payable to any holder of Shares whose Shares are accepted for purchase by the Company any amounts that the Company is required to deduct and withhold with respect to the making of such payment under the Internal Revenue Code of 1986, as amended, or any provision of state, local or foreign tax law. To the extent that amounts are withheld, the withheld amounts shall be treated for all purposes as having been paid and issued to the holder of Shares in respect of which such deduction and withholding was made.

4. Determinations of Validity. All questions as to the form of documents and the validity of Shares will be resolved by the Company in its sole discretion, whose determination shall be final and binding, subject to the rights of tendering shareholders to challenge the Company’s determination in a court of competent jurisdiction. The Company reserves the absolute right to reject any deliveries of any Shares that are not in proper form, or the acceptance of which would, in the opinion of the Company or its counsel, be unlawful. The Company reserves the absolute right to waive any defect or irregularity of delivery for exchange with regard to any Shares, provided that any such waiver shall apply to all tenders of Shares.

INSTRUCTIONS TO LETTER OF TRANSMITTAL (continued)

NONE OF THE COMPANY, ITS BOARD OF DIRECTORS, OWL ROCK CAPITAL ADVISORS LLC OR ANY OTHER PERSON IS OR WILL BE OBLIGATED TO GIVE ANY NOTICE OF ANY DEFECT OR IRREGULARITY IN ANY TENDER, AND NONE OF THEM WILL INCUR ANY LIABILITY FOR FAILURE TO GIVE ANY SUCH NOTICE.

5. Requests for Assistance or Additional Copies. Requests for assistance or for additional copies of this Letter of Transmittal may be directed to the Company at the address set forth on the cover page of this Letter of Transmittal. Shareholders who do not own Shares directly may also obtain such information and copies from their commercial bank, trust company or other nominee. Shareholders who do not own Shares directly are required to tender their Shares through their commercial bank, trust company or other nominee and should NOT submit this Letter of Transmittal to the Company.

6. Backup Withholding. Each holder that desires to tender Shares must, unless an exemption applies, provide the Company with the holder’s taxpayer identification number on the IRS Form W-9 included with this Letter of Transmittal, with the required certifications being made under penalties of perjury. If the holder is an individual, the taxpayer identification number is his or her social security number. If the Company is not provided with the correct taxpayer identification number, the holder may be subject to a $50 penalty imposed by the IRS in addition to being subject to backup withholding.

Holders are required to give the Company the taxpayer identification number of the registered holder of the Shares by completing the IRS Form W-9 included with this Letter of Transmittal. If the Shares are registered in more than one name or are not in the name of the actual owner, consult Part II of the General Instructions to Form W-9, which immediately follow the IRS Form W-9.

If backup withholding applies, the Company is required to withhold a portion of any payment made to the shareholder with respect to Shares purchased pursuant to the Offer. The applicable rate for backup withholding is currently 28%. Backup withholding is not an additional tax. Rather, the U.S. federal income tax liability of persons subject to backup withholding will be reduced by the amount of tax withheld. If withholding results in an overpayment of taxes, a refund may be obtained by the holder from the IRS.

Certain holders (including, among others, most corporations and certain foreign persons) are exempt from backup withholding requirements. To qualify as an exempt recipient on the basis of foreign status, a holder must generally submit a properly completed IRS Form W-8BEN, IRS Form W-8BEN-E, IRS Form W-8IMY or IRS Form W-8ECI, signed under penalties of perjury, attesting to that person’s exempt status. A holder would use an IRS Form W-8BEN to certify that it is neither a citizen nor a resident of the United States and would use an IRS Form W-8ECI to certify that (1) it is neither a citizen nor resident of the United States, and (2) the proceeds of the sale of the Shares are effectively connected with a U.S. trade or business. A non-U.S. holder may also use an IRS Form W-8BEN to certify that it is eligible for benefits under a tax treaty between the United States and such foreign person’s country of residence.

HOLDERS SHOULD CONSULT THEIR TAX ADVISOR(S) AS TO THEIR QUALIFICATION FOR EXEMPTION FROM THE BACKUP WITHHOLDING REQUIREMENTS AND THE PROCEDURE FOR OBTAINING AN EXEMPTION.

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IMPORTANT: THIS LETTER OF TRANSMITTAL PROPERLY COMPLETED AND BEARING ORIGINAL SIGNATURE(S) MUST BE RECEIVED BY THE COMPANY AT THE ADDRESS SET FORTH ON THE FRONT PAGE OF THIS LETTER OF TRANSMITTAL PRIOR TO THE EXPIRATION DATE.