This Amendment No. 13 to Schedule 13D (this Amendment
No. 13) is filed by the Reporting Persons as an amendment to the Schedule 13D filed with the Securities and Exchange Commission (the Commission) on June 19, 2013, as
amended by Amendment No. 1 to Schedule 13D filed with the Commission on October 15, 2013, as amended by Amendment No. 2 to Schedule 13D filed with the Commission on May 7, 2015, as amended by Amendment No. 3 to Schedule 13D
filed with the Commission on October 2, 2015, as amended by Amendment No. 4 to Schedule 13D filed with the Commission on December 8, 2015, as amended by Amendment No. 5 to Schedule 13D filed with the Commission on
December 16, 2015, as amended by Amendment No. 6 to Schedule 13D filed with the Commission on December 28, 2015, as amended by Amendment No. 7 to Schedule 13D filed with the Commission on January 5, 2016, as amended by
Amendment No. 8 to Schedule 13D filed with the Commission on January 11, 2016, as amended by Amendment No. 9 to Schedule 13D filed with the Commission on March 30, 2016, and as amended by Amendment No. 10 to Schedule 13D
filed with the Commission on April 15, 2016, as amended by Amendment No. 11 to Schedule 13D filed with the Commission on June 1, 2016, as amended by Amendment No. 12 to Schedule 13D (Amendment
No. 12) filed with the Commission on March 26, 2021 (as amended, this Schedule 13D). This Amendment relates to the common units representing limited partner interests (the
Common Units) of Crestwood Equity Partners LP, a Delaware limited partnership (the Issuer). Capitalized terms used but not otherwise defined herein shall have the meaning ascribed to such terms in
the Schedule 13D.
Item 4. Purpose of the Transaction
Item 4 is hereby supplemented as follows:
The transactions
described in Amendment No. 12 to the 13D filed by the Reporting Persons on March 26, 2021 closed on March 30, 2021. As a result of the closing of these transactions, none of the Reporting Persons filing this Amendment No. 13
beneficially owns any Common Units, and such Reporting Persons no longer own or control Gas Service Holdings. Therefore, Gas Service Holdings is no longer a Reporting Person on this Schedule 13D. Following the closing of the transactions described
in Amendment No. 12, Gas Service Holdings directly held 3,985,462 Common Units.
Item 5. Interest in Securities of the Issuer
Item 5(a) and (b) of the Schedule 13D is hereby amended and restated as follows:
(a) and (b). The information contained on the cover pages of this Schedule 13D is incorporated herein by reference. As of March 30, 2021, none of the
Reporting Persons to this Amendment No. 13 beneficially owns any Common Units.
As of March 30, 2021, Gas Service Holdings directly held
3,985,462 Common Units and 438,789 Subordinated Units.
Item 5(c) of the Schedule 13D is hereby amended and restated as follows:
(c). Except as described in this Amendment No. 13, none of the Reporting Persons have effected any transactions in the Common Units during the past 60
days.
Item 5(e) of the Schedule 13D is hereby amended and restated as follows:
(e). As of March 30, 2021, the Reporting Persons to this Amendment No. 13 ceased to beneficially own more than five percent of the outstanding
Common Units. As of the closing of the transactions contemplated by Amendment No. 12, Gas Service Holdings ceased to be owned or controlled by the Reporting Persons and ceased to be a Reporting Person on this Schedule 13D.
[Signature Pages Follow]