As filed with the Securities and Exchange Commission on February 5, 2015

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Columbia Pipeline Partners LP

(Exact name of registrant as specified in its charter)

5151 San Felipe St., Suite 2500

Houston, Texas 77056

713-386-3701

(Address, including Zip Code, and Telephone Number, including Area Code, of Registrant’s Principal Executive Offices)

Carrie J. Hightman

Executive Vice President and Chief Legal Officer

801 East 86^th Avenue

Merillville, Indiana 46410

(877) 647-5990

(Name, Address, including Zip Code, and Telephone Number, including Area Code, of Agent for Service)

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after this Registration Statement becomes effective.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box.  ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  x File No. 333-198990

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

CALCULATION OF REGISTRATION FEE

The Registration Statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) under the Securities Act of 1933, as amended.

EXPLANATORY NOTE

This registration statement is being filed with respect to the registration of additional common units representing limited partner interests of Columbia Pipeline Partners LP, a Delaware limited partnership, pursuant to Rule 462(b) under the Securities Act of 1933, as amended. The contents of the registration statement on Form S-1 (Registration No. 333-198990), initially filed by Columbia Pipeline Partners LP with the Securities and Exchange Commission on September 29, 2014, as amended by Amendment No. 1 thereto filed on November 12, 2014, Amendment No. 2 thereto filed on December 10, 2014, Amendment No. 3 thereto filed on December 12, 2014, Amendment No. 4 thereto filed on January 2, 2015, Amendment No. 5 thereto filed on January 12, 2015 and Amendment No. 6 thereto filed on January 26, 2015, and which was declared effective on February 5, 2015, including the exhibits thereto, are incorporated herein by reference.

The required opinions and consents are listed on an Exhibit Index attached hereto and filed herewith.

The Registrant hereby certifies to the Commission that (i) it has instructed its attorneys to pay on its behalf to the Commission the filing fee set forth on the cover page of this registration statement by a wire transfer of such amount to the Securities and Exchange Commission’s account at U.S. Bank as soon as practicable (but no later than the close of business on February 6, 2015), (ii) it will not revoke such instructions, (iii) there are sufficient funds in the relevant account to cover the amount of such filing fee, and (iv) it will confirm receipt of such instructions no later than February 6, 2015.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

All exhibits previously filed or incorporated by reference in the registrant’s Registration Statement on Form S-1, as amended (Registration No. 333-198990), are incorporated by reference into, and shall be deemed to be a part of this filing, except for the following, which are filed herewith:

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on February 5, 2015.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and the dates indicated.

INDEX TO EXHIBIT