Filed Pursuant to Rule 424(b)(3)

SEC File No.: 333-230817

CAPITOL INVESTMENT CORP. IV

1300 17th Street, Suite 820

Arlington, VA 22209

PROXY STATEMENT/PROSPECTUS SUPPLEMENT

June 24, 2019

TO THE SHAREHOLDERS OF CAPITOL INVESTMENT CORP. IV:

This is a supplement (this “Supplement”) to the proxy statement/prospectus of Capitol Investment Corp. IV (the “Company”), dated June 24, 2019 (the “Proxy Statement/Prospectus”), that is being sent to you in connection with the Company’s extraordinary general meeting of shareholders of Capitol to consider and vote upon, among other things, a proposal to approve and adopt the Agreement and Plan of Merger, dated as of April 7, 2019 (“Merger Agreement”), by and among the Company, Capitol Intermediate Holdings, LLC, a Delaware limited liability company and wholly-owned subsidiary of the Company, Capitol Investment Merger Sub 1, LLC, a Delaware limited liability company and wholly-owned subsidiary of the Company, Capitol Investment Merger Sub 2, LLC, a Delaware limited liability company and wholly-owned subsidiary of the Company, NESCO Holdings, LP, a Delaware limited partnership, and NESCO Holdings I, Inc., a Delaware corporation (“Nesco”).

We are sending you this supplement to provide you with an investor update relating to Nesco’s operations to aid you in your analysis of the proposed transactions described in the Proxy Statement/Prospectus.

Before you vote you should read the Proxy Statement/Prospectus and other documents that the Company has filed with the Securities and Exchange Commission, together with this Supplement, for more complete information about the Company, Nesco and the proposed transactions. If you need additional copies of this Supplement, the Proxy Statement/Prospectus, or the proxy card you should contact:

Mr. L. Dyson Dryden

Capitol Investment Corp. IV

1300 17th Street, Suite 820

Arlington, VA 22209

Tel: (202) 654-7060

Fax: (202) 654-7070

or:

Morrow Sodali LLC

470 West Avenue

Stamford, CT 06902

Tel: (800) 662-5200 or banks and brokers can call collect at (203) 658-9400

Email: CIC.info@morrowsodali.com

You may also obtain a free copy of this Supplement, the Proxy Statement/Prospectus and other documents containing information about the Company, Nesco and the proposed transactions, without charge, at the SEC’s website at www.sec.gov.

This Supplement should be read together with the Proxy Statement/Prospectus. To the extent that the information in this Supplement is inconsistent with the information in the Proxy Statement/Prospectus, the information in this Supplement supersedes the information in the Proxy Statement/Prospectus. Terms that are defined in the Proxy Statement/Prospectus have the same meanings in this Supplement, unless a new definition for such term is provided herein.

All of the Company’s shareholders are cordially invited to attend the extraordinary general meeting in person. If you are a shareholder of record and you have already provided a proxy, your shares will be voted in accordance with your instructions at the extraordinary general meeting, unless you affirmatively change your proxy as described in the Proxy Statement/Prospectus. If you have not yet provided a proxy, you are urged to complete, sign, date and return the proxy card that was enclosed with the Proxy Statement/Prospectus as soon as possible. If you are a shareholder of record, you may also cast your vote in person at the extraordinary general meeting. If your shares are held in an account at a brokerage firm or bank, you must instruct your broker or bank on how to vote your shares or, if you wish to attend the extraordinary general meeting and vote in person, obtain a proxy from your broker or bank. If you have already instructed your broker or bank how to vote your shares, your shares will be voted in accordance with those instructions at the extraordinary general meeting, unless you affirmatively change your instructions as described in the Proxy Statement/Prospectus.

Your vote is important regardless of the number of shares you own. Whether you plan to attend the extraordinary general meeting or not, please sign, date and return the enclosed proxy card as soon as possible in the envelope provided. If your shares are held in “street name” or are in a margin or similar account, you should contact your broker to ensure that votes related to the shares you beneficially own are properly counted.

Thank you for your participation. We look forward to your continued support.

By Order of the Board of Directors

/s/ Mark D. Ein

Mark D. Ein

Chairman of the Board and Chief Executive Officer

This Supplement is dated June 24, 2019 and is first being mailed to shareholders of the Company on or about such date.