Tallgrass Energy SC 13D/A Tallgrass Energy, LP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 3)*

Tallgrass Energy, LP

(Name of Issuer)

Class A Shares Representing Limited Partner Interests

(Title of Class of Securities)

874696107

(CUSIP Number)

John G. Finley

The Blackstone Group Inc.

345 Park Avenue

New York, NY 10154

Tel: (212)583-5000

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

July 30, 2019

(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 Rule13d-1(e), Rule13d-1(f) or Rule13d-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 Rule13d-7(b) for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

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).

1	Name of Reporting Person Prairie ECI Acquiror LP
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 98,353,838
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 98,353,838

11	Aggregate Amount Beneficially Owned by Each Reporting Person 98,353,838
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 35.44%
14	Type of Reporting Person PN

1

1	Name of Reporting Person PrairieNon-ECI Acquiror LP
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 21,751,018
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 21,751,018

11	Aggregate Amount Beneficially Owned by Each Reporting Person 21,751,018
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 12.14%
14	Type of Reporting Person PN

2

1	Name of Reporting Person Prairie VCOC Acquiror LP
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 2,301,283
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 2,301,283

11	Aggregate Amount Beneficially Owned by Each Reporting Person 2,301,283
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 1.27%
14	Type of Reporting Person PN

3

1	Name of Reporting Person Prairie Secondary Acquiror LP
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 773,510
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 773,510

11	Aggregate Amount Beneficially Owned by Each Reporting Person 773,510
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 0.43%
14	Type of Reporting Person PN

4

1	Name of Reporting Person Prairie Secondary Acquiror E LP
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 1,127,935
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 1,127,935

11	Aggregate Amount Beneficially Owned by Each Reporting Person 1,127,935
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 0.63%
14	Type of Reporting Person PN

5

1	Name of Reporting Person BIP Holdings Manager L.L.C.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person OO

6

1	Name of Reporting Person Blackstone Infrastructure Associates L.P.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person PN

7

1	Name of Reporting Person BIA GP L.P.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person PN

8

1	Name of Reporting Person BIA GP L.L.C.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person OO

9

1	Name of Reporting Person Blackstone Holdings III L.P.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Quebec, Canada

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person PN

10

1	Name of Reporting Person Blackstone Holdings III GP L.P.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person PN

11

1	Name of Reporting Person Blackstone Holdings III GP Management L.L.C.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person OO

12

1	Name of Reporting Person The Blackstone Group Inc.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person CO

13

1	Name of Reporting Person Blackstone Group Management L.L.C.
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization Delaware

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person OO

14

1	Name of Reporting Person Stephen A. Schwarzman
2	Check the Appropriate Box if a Member of a Group (A):  ☐        (B):  ☒
3	SEC Use Only
4	Source of Funds OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(D) or 2(E) ☐
6	Citizenship or Place of Organization United States of America

Number of Shares   Beneficially   Owned by Each Reporting Person with	7	Sole Voting Power 0
	8	Shared Voting Power 124,307,584
	9	Sole Dispositive Power 0
	10	Shared Dispositive Power 124,307,584

11	Aggregate Amount Beneficially Owned by Each Reporting Person 124,307,584
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares ☐
13	Percent of Class Represented by Amount in Row (11) 44.42%
14	Type of Reporting Person IN

15

This Amendment No. 3 to Schedule 13D (this “Amendment No. 3”) relates to the Class A Shares Representing Limited Partner Interests (the “Class A Shares”) of Tallgrass Energy, LP, a Delaware limited partnership (the “Issuer”), and amends and supplements the initial statement on Schedule 13D filed by the Reporting Persons with the Securities and Exchange Commission (the “SEC”) on March 11, 2019 (the “Original 13D”), as amended by Amendment No. 1 to Schedule 13D filed by the Reporting Persons with the SEC on March 25, 2019 (“Amendment No. 1”) and Amendment No. 2 to Schedule 13D filed by the Reporting Persons with the SEC on May 9, 2019 (“Amendment No. 2” and, together with the Original 13D and Amendment No. 1, the “Schedule 13D”). This Amendment No. 3 reflects, among other things, the conversion of The Blackstone Group L.P., a Delaware limited partnership, into a Delaware corporation named The Blackstone Group Inc., which became effective on July 1, 2019. Capitalized terms used but not defined in this Amendment No. 3 shall have the same meanings ascribed to them in the Schedule 13D. Except as specifically provided herein, this Amendment No. 3 does not modify any of the information previously reported in the Schedule 13D.

Item 2. Identity and Background.

Item 2 of the Schedule 13D is hereby amended and restated in its entirety as follows:

(a)-(b) The Schedule 13D is being filed by the following Reporting Persons:

(i) Prairie ECI Acquiror LP, a Delaware limited partnership(“Up-C Acquiror 1”), Prairie VCOC Acquiror LP, a Delaware limited partnership(“Up-C Acquiror 2”, and together withUp-C Acquiror 1, the“Up-C Acquirors”) and PrairieNon-ECI Acquiror LP, a Delaware limited partnership (“Class A Acquiror”);

(ii) Prairie Secondary Acquiror LP, a Delaware limited partnership (“Secondary Acquiror 1”), and Prairie Secondary Acquiror E LP, a Delaware limited partnership (“Secondary Acquiror 2” and, collectively with Secondary Acquiror 1, “Prairie Secondary Acquirors”);

(iii) BIP Holdings Manager L.L.C., a Delaware limited liability company (“Holdings Manager”); Blackstone Infrastructure Associates L.P., a Delaware limited partnership (“Blackstone Infrastructure”); BIA GP L.P., a Delaware limited partnership; BIA GP L.L.C., a Delaware limited liability company; Blackstone Holdings III L.P., a limited partnership formed in Quebec, Canada; Blackstone Holdings III GP L.P., a Delaware limited partnership; Blackstone Holdings III GP Management L.L.C., a Delaware limited liability company; The Blackstone Group Inc. (f/k/a The Blackstone Group L.P.), a Delaware corporation (“Blackstone”), and Blackstone Group Management L.L.C., a Delaware limited liability company (collectively withUp-C Acquiror 1,Up-C Acquiror 2, Class A Acquiror, Secondary Acquiror 1 and Secondary Acquiror 2, the “Blackstone Entities”); and

(iv) Stephen A. Schwarzman, a citizen of the United States of America.

The principal business address of each of the Reporting Persons is c/o The Blackstone Group Inc., 345 Park Avenue, New York, New York 10154.

Information regarding each director and executive officer of The Blackstone Group Inc. is set forth onSchedule I attached hereto.

(c) The principal business of each ofUp-C Acquiror 1,Up-C Acquiror 2, Class A Acquiror, Secondary Acquiror 1 and Secondary Acquiror 2 is investing in securities of the Issuer.

The principal business of Holdings Manager is performing the functions of, and serving as, the general partner of each of theUp-C Acquirors, Class A Acquiror, the Prairie Secondary Acquirors and other affiliated Blackstone entities. The principal business of Blackstone Infrastructure is performing the functions of, and serving as, the managing member of Holdings Manager and other affiliated Blackstone entities. The principal business of BIA GP L.P. is performing the functions of, and serving as, the general partner of Blackstone Infrastructure and other affiliated Blackstone entities. The principal business of BIA GP L.L.C. is performing the functions of, and serving as, the general partner of BIA GP L.P. and other affiliated Blackstone entities.

The principal business of Blackstone Holdings III L.P. is performing the functions of, and serving as, the managing member (or similar position) and member or equity holder in various affiliated Blackstone entities. The principal business of Blackstone Holdings III GP L.P. is performing the functions of, and serving as, the general partner of Blackstone Holdings III L.P. and other affiliated Blackstone entities. The principal business of Blackstone Holdings III GP Management L.L.C. is performing the functions of, and serving as, the general partner of Blackstone Holdings III GP L.P. and other affiliated Blackstone entities. The principal business of The Blackstone Group Inc. is performing the functions of, and serving as, the sole member of Blackstone Holdings III GP Management L.L.C., and in a similar capacity for other affiliated Blackstone entities. The principal business of Blackstone Group Management L.L.C. is performing the functions of, and serving as, the sole holder of the Class C common stock of The Blackstone Group Inc.

16

The principal occupation of Mr. Schwarzman is serving as an executive of The Blackstone Group Inc. and Blackstone Group Management L.L.C.

(d) During the last five years, none of the Reporting Persons or, to the best knowledge of the Reporting Persons, any of the other persons set forth onSchedule I attached hereto, has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Reporting Persons or, to the best knowledge of the Reporting Persons, any of the other persons set forth onSchedule I attached hereto, has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) See Items 2(a)-(b) above for place of organization or citizenship of each of the Reporting Persons.

Item 3. Source and Amount of Funds or Other Consideration.

Item 3 of the Schedule 13D is hereby amended by inserting the following information at the end of Item 3:

The information in Item 6 of the Schedule 13D is incorporated herein by reference.

Item 5. Interest in Securities of the Issuer.

Item 5(a) – (b) of the Schedule 13D is hereby amended and restated as follows:

Calculations of the percentage of Class A Shares beneficially owned are calculated in accordance with Rule13d-3 and assumes that there are 279,852,537 Class A Shares outstanding (other than for (i) Class A Acquiror and the Prairie Secondary Acquirors, which assumes 179,197,416 Class A Shares outstanding,(ii) Up-C Acquiror 1, which assumes 277,551,254 Class A Shares outstanding and(iii) Up-C Acquiror 2, which assumes 181,498,699 Class A Shares are outstanding), which takes into account the number of TE Units that may be deemed to be beneficially owned by the Reporting Persons, as applicable, which are exchangeable together with Class B Shares for a corresponding number of Class A Shares, pursuant to the TGE LP Agreement (defined in Item 6 below).

The aggregate number and percentage of Class A Shares beneficially owned by each Reporting Person and, for each Reporting Person, the number of shares as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition are set forth on rows 7 through 11 and row 13 of the cover pages of this Schedule 13D and are incorporated herein by reference.

Class A Acquiror directly holds 21,751,018 Class A Shares.

Up-C Acquiror 1 directly holds 98,353,838 Class B Shares and a corresponding number of TE Units, andUp-C Acquiror 2 directly holds 2,301,283Class B Shares and a corresponding number of TE Units. These amounts include a correction of the number of Class B Shares and TE Units previously reported as beneficially owned by theUp-C Acquirors.

Secondary Acquiror 1 directly holds 773,510 Class A Shares, and Secondary Acquiror 2 directly holds 1,127,935 Class A Shares.

17

Holdings Manager is the general partner of each of theUp-C Acquirors, Class A Acquiror and each of the Prairie Secondary Acquirors. Blackstone Infrastructure is the sole member of Holdings Manager. BIA GP L.P. is the general partner of Blackstone Infrastructure. BIA GP L.L.C. is the general partner of BIA GP L.P. Blackstone Holdings III L.P. is the sole member of BIA GP L.L.C. Blackstone Holdings III GP L.P. is the general partner of Blackstone Holdings III L.P. Blackstone Holdings III GP Management L.L.C. is the general partner of Blackstone Holdings III GP L.P. The Blackstone Group Inc. is the sole member of Blackstone Holdings III GP Management L.L.C. Blackstone Group Management L.L.C. is the sole holder of the Class C common stock of The Blackstone Group Inc. Blackstone Group Management L.L.C. is wholly-owned by Blackstone’s senior managing directors and controlled by its founder, Stephen A. Schwarzman.

Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any of the Reporting Persons (other than the Acquirors to the extent they directly hold the securities reported on this Schedule 13D) is the beneficial owner of the Class A Shares referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or for any other purpose, and such beneficial ownership is expressly disclaimed. Each Reporting Person expressly disclaims beneficial ownership of such Class A Shares and any assertion or presumption that it or he and the other persons on whose behalf this Schedule 13D is filed constitute a “group.”

In accordance with the Securities and Exchange Commission ReleaseNo. 34-39538 (the “Release”), this filing does not reflect securities, if any, beneficially owned by the Harvest Fund Advisors LLC business, a subsidiary business of The Blackstone Group L.P., whose ownership of securities is disaggregated from that of the rest of The Blackstone Group L.P. and its other affiliates in accordance with the Release.

By virtue of an Equityholders Agreement, dated March 11, 2019, by and among certain of the Reporting Persons and their equityholders, Jasmine Ventures Pte. Ltd. and certain of its affiliates (“GIC”), and Enagas Holding USA, S.L.U. and certain of its affiliates (“Enagas”), may each be deemed to be a member of a “group” for purposes of Section 13(d) of the Exchange Act. However, neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that the Reporting Persons, GIC and Enagas are members of any such group. Each of GIC and Enagas (collectively, the “Separately Reporting Persons”) has separately made a Schedule 13D filing reporting the Class A Shares they may be deemed to beneficially own. Collectively, the Reporting Persons, GIC and Enagas beneficially own an aggregate of 124,307,584 Class A Shares, representing approximately 44.42% of the outstanding Class A Shares. Each Reporting Person disclaims beneficial ownership of the Class A Shares that may be deemed to be beneficially owned by GIC and Enagas.

Item 5(c) of the Schedule 13D is hereby amended by inserting the following information at the end of Item 5(c):

Except as set forth in this Amendment No. 3, none of the Reporting Persons has effected any transactions in Class A Shares during the past 60 days.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer.

Item 6 of the Schedule 13D is hereby amended by inserting the following information at the end of Item 6:

Post-CFIUS Approval Assignment

On July 24, 2019, CFIUS approved Enagas Investor making further investments in securities of the Issuer. In accordance with the terms of the Equityholders Agreement, which provided that, upon such approval by CFIUS, certain of the BIP Funds were required to transfer indirect interests in additional Issuer securities to Enagas Investor upon such CFIUS approval, on July 30, 2019, certain of the BIP Funds transferred to Enagas Investor (i) an indirect interest with respect to 66,931 Class A Shares held by Secondary Acquiror 2 plus a corresponding percentage of Secondary Acquiror 2’s capital in exchange for approximately $14.1 million and (ii) an indirect interest in 4,308,696 TE Units and 4,308,696 Class B Shares in exchange for approximately $83.4 million plus the assumption of approximately $40.7 million of debt. Additionally, in connection with such transfers and pursuant to the terms of the Equityholders Agreement,Up-C Acquiror 2 assigned 150,439 TE Units and 150,439 Class B Shares toUp-C Acquiror 1.

18

SIGNATURES

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.

Date: August 1, 2019

PRAIRIE ECI ACQUIROR LP
By: BIP Holdings Manager L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
PRAIRIENON-ECI ACQUIROR LP
By: BIP Holdings Manager L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
PRAIRIE VCOC ACQUIROR LP
By: BIP Holdings Manager L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
PRAIRIE SECONDARY ACQUIROR LP
By: BIP Holdings Manager L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
PRAIRIE SECONDARY ACQUIROR E LP
By: BIP Holdings Manager L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director

[Tallgrass Energy, LP – Schedule 13D/A]

BIP HOLDINGS MANAGER L.L.C.
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
BLACKSTONE INFRASTRUCTURE ASSOCIATES L.P.
By: BIA GP L.P., its general partner
By: BIA GP L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
BIA GP L.P.
By: BIA GP L.L.C., its general partner
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
BIA GP L.L.C.
By:	/s/ Sean Klimczak
Name: Sean Klimczak
Title: Senior Managing Director
BLACKSTONE HOLDINGS III L.P.
By: Blackstone Holdings III GP L.P., its general partner
By: Blackstone Holdings III GP Management L.L.C., its general partner
By:	/s/ John G. Finley
Name: John G. Finley
Title: Chief Legal Officer

[Tallgrass Energy, LP – Schedule 13D/A]

BLACKSTONE HOLDINGS III GP L.P.
By: Blackstone Holdings III GP Management L.L.C., its general partner
By:	/s/ John G. Finley
Name: John G. Finley
Title: Chief Legal Officer
BLACKSTONE HOLDINGS III GP MANAGEMENT L.L.C.
By:	/s/ John G. Finley
Name: John G. Finley
Title: Chief Legal Officer
THE BLACKSTONE GROUP INC.
By:	/s/ John G. Finley
Name: John G. Finley
Title: Chief Legal Officer
BLACKSTONE GROUP MANAGEMENT L.L.C.
By:	/s/ John G. Finley
Name: John G. Finley
Title: Chief Legal Officer
STEPHEN A. SCHWARZMAN
By:	/s/ Stephen A. Schwarzman
By: Stephen A. Schwarzman

[Tallgrass Energy, LP – Schedule 13D/A]

SCHEDULE I

Executive Officers and Directors of The Blackstone Group Inc.

The name and principal occupation of each director and executive officer of The Blackstone Group Inc. are set forth below. The address for each person listed below is c/o The Blackstone Group Inc., 345 Park Avenue, New York, New York 10154. All executive officers and directors listed are United States citizens other than The Honorable Brian Mulroney, who is a citizen of Canada, and Sir John Antony Hood, who is a citizen of New Zealand.

OFFICERS:

Name	Present Principal Occupation or Employment
Stephen A. Schwarzman	Founder, Chairman and Chief Executive Officer of The Blackstone Group Inc.
Jonathan D. Gray	President, Chief Operating Officer of The Blackstone Group Inc.
Hamilton E. James	Executive Vice Chairman of The Blackstone Group Inc.
Bennett J. Goodman	Senior Managing Director andCo-Founder of GSO Capital Partners
Michael S. Chae	Chief Financial Officer of The Blackstone Group Inc.
John G. Finley	Chief Legal Officer of The Blackstone Group Inc.
Joan Solotar	Senior Managing Director — Head of Private Wealth Solutions and External Relations of The Blackstone Group Inc.
DIRECTORS:
Name	Present Principal Occupation or Employment
Stephen A. Schwarzman	Founder, Chairman and Chief Executive Officer of The Blackstone Group Inc.
Jonathan D. Gray	President, Chief Operating Officer of The Blackstone Group Inc.
Hamilton E. James	Executive Vice Chairman of The Blackstone Group Inc.
Bennett J. Goodman	Senior Managing Director andCo-Founder of GSO Capital Partners of The Blackstone Group Inc.
Kelly A. Ayotte	Former United States Senator from New Hampshire
James W. Breyer	Founder and Chief Executive Officer of Breyer Capital

[Tallgrass Energy, LP – Schedule 13D/A]

Sir John Antony Hood	President and Chief Executive Officer of the Robertson Foundation and Chair of the Rhodes Trust
Rochelle B. Lazarus	Chairman Emeritus & Former Chief Executive Officer, Ogilvy & Mather Worldwide
Jay O. Light	Dean Emeritus, Harvard Business School
The Right Honorable Brian Mulroney	Senior Partner and International Business Consultant for the Montreal law firm, Norton Rose Canada LLP
William G. Parrett	Retired CEO and Senior Partner, Deloitte (Deloitte Touche Tohmatsu)

Except as set forth in this Schedule 13D, to the best knowledge of the Reporting Persons, none of the individuals listed above beneficially owns any Class A Shares.

[Tallgrass Energy, LP – Schedule 13D/A]