NGL

SEC source: 0001104659-19-064597 · a4.xml · nonDerivative · entry 1

KNEALE JAMES C · CIK 0001185022 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,000

SEC source: 0001104659-19-064811 · a4.xml · nonDerivative · entry 1

Coady Shawn W · CIK 0001520329 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 106,304

SEC source: 0001104659-19-047140 · a4.xml · nonDerivative · entry 2

McMurray Kurston Patrick · CIK 0001707311 · GC, Exec. VP and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,435

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-047140 · a4.xml · nonDerivative · entry 1

McMurray Kurston Patrick · CIK 0001707311 · GC, Exec. VP and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 78,625

SEC source: 0001104659-19-047174 · a4.xml · nonDerivative · entry 2

Karlovich Robert W III · CIK 0001476825 · CFO, Executive VP

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 126,374

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-047174 · a4.xml · nonDerivative · entry 1

Karlovich Robert W III · CIK 0001476825 · CFO, Executive VP

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 129,564

SEC source: 0001104659-19-047143 · a4.xml · nonDerivative · entry 2

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,163,972

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-047143 · a4.xml · nonDerivative · entry 1

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,197,369

SEC source: 0001104659-19-047141 · a4.xml · nonDerivative · entry 2

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,432

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-047141 · a4.xml · nonDerivative · entry 1

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,534

SEC source: 0001104659-19-046670 · a4.xml · nonDerivative · entry 1

COLLINGSWORTH JAMES M · CIK 0001206714 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 8,500

F1 · ownership.nature: The units reported on this line are held jointly by the Reporting Person's spouse and sister-in-law.

SEC source: 0001104659-19-046502 · a4.xml · nonDerivative · entry 1

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · SEE FTN

Disclosed balance after: 60,000

F1 · price: The price is the weighted average price for the common units reported on this line. The range of prices from the transactions reported on this line is between $12.54 and $12.80. Complete information regarding the number of common units purchased at each separate price will be provided upon request by the Commission Staff, the issuer or a security holder of the issuer.

F2 · ownership.nature: These units are owned directly by Krimbill Enterprises LP II, and controlled by the Reporting Person via his ownership of its general partner, Krimbill Holding Company. The Reporting Person exercises the sole voting and disposition power for Krimbill Enterprises LP II. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all the reported securities for purposes of Section 16 or any other purpose.

SEC source: 0001104659-19-039840 · a4.xml · nonDerivative · entry 1

CROPPER STEPHEN L · CIK 0001174439 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,000

SEC source: 0001104659-19-039827 · a4.xml · nonDerivative · entry 1

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,122,067

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-039826 · a4.xml · nonDerivative · entry 1

COLLINGSWORTH JAMES M · CIK 0001206714 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,500

F1 · ownership.direct: 2,000 of these units are owned jointly by the Reporting Person and his spouse, Cindy Collingsworth.

SEC source: 0001104659-19-039851 · a4.xml · nonDerivative · entry 1

GUDERIAN BRYAN K · CIK 0001218401 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,500

SEC source: 0001104659-19-035209 · a4.xml · nonDerivative · entry 2

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,156,417

F1 · price: The price is the weighted average price for the common units reported on this line. The range of prices from the transactions reported on this line is between $14.416 and $14.59. Complete information regarding the number of common units purchased at each separate price will be provided upon request by the Commission Staff, the issuer or a security holder of the issuer.

SEC source: 0001104659-19-035209 · a4.xml · nonDerivative · entry 1

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,141,417

SEC source: 0001104659-19-034124 · a4.xml · nonDerivative · entry 1

RAYMOND JOHN T · CIK 0001186173 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F1 · ownership.nature: The common units reported herein are owned directly by EMG NGL HC, LLC. Beneficial ownership of the common units is reported by John T. Raymond solely in his capacity as the Chief Executive Officer of EMG NGL HC, LLC. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of the common units in this Form 4 shall not be deemed an admission of beneficial ownership of all of the reported common units for purposes of Section 16 or for any other purpose.

SEC source: 0001104659-19-029376 · a4.xml · derivative · entry 1

OAKTREE FUND GP II, L.P. · CIK 0001402869 · 10% owner

Oaktree Capital II, L.P. · CIK 0001403378 · 10% owner

Oaktree Holdings, Inc. · CIK 0001403382 · 10% owner

Oaktree Capital Group, LLC · CIK 0001403528 · 10% owner

Oaktree Capital Group Holdings GP, LLC · CIK 0001403525 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Units · 12,473,191 shares

Expires not disclosed

F1 · derivative.exercise_price: The 10.75% Class A Convertible Preferred Units (the "Preferred Units") are convertible at the quotient (the "Conversion Rate"), per unit and subject to certain adjustments, of (i) $12.035 (the "Class A Preferred Unit Price") and (ii) the Class A Preferred Unit Price; provided, however, that if the volume-weighted average trading price (the "VWAP Price") for the fifteen (15) consecutive trading days ending on the trading day immediately preceding the Initial Conversion Date is less than the Class A Preferred Unit Price (such price, the "Adjusted VWAP Price"), then at all times on and after the Initial Conversion Date, the figure used in clause (ii) shall be the greater of (A) the Adjusted VWAP Price and (B) $5.00 (subject to adjustment for any splits, combinations or recapitalizations).

F2 · kind: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F2 · derivative.exercise_date: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F2 · derivative.expiration_date: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F3 · balance_after: The Form 4 filed by the Reporting Persons on April 9, 2019 incorrectly stated the number of securities beneficially owned following the reported redemption of Preferred Units.

F4 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV A, LLC ("NGL CIV") and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism") and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar NGL Main Interco LLC ("Highstar Main") and is the managing member of NGL Prism/IV-A Blocker LLC ("NGL Blocker") and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by Highstar Prism, Highstar Main, NGL CIV and NGL Blocker.

F5 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

SEC source: 0001104659-19-029374 · a4.xml · derivative · entry 1

Highstar Capital IV, L.P. · CIK 0001503547 · Director · 10% owner

Parker Jared · CIK 0001657224 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Units · 12,473,191 shares

Expires not disclosed

F1 · derivative.exercise_price: The 10.75% Class A Convertible Preferred Units (the "Preferred Units") are convertible at the quotient (the "Conversion Rate"), per unit and subject to certain adjustments, of (i) $12.035 (the "Class A Preferred Unit Price") and (ii) the Class A Preferred Unit Price; provided, however, that if the volume-weighted average trading price (the "VWAP Price") for the fifteen (15) consecutive trading days ending on the trading day immediately preceding the Initial Conversion Date is less than the Class A Preferred Unit Price (such price, the "Adjusted VWAP Price"), then at all times on and after the Initial Conversion Date, the figure used in clause (ii) shall be the greater of (A) the Adjusted VWAP Price and (B) $5.00 (subject to adjustment for any splits, combinations or recapitalizations).

F2 · kind: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F2 · derivative.exercise_date: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F2 · derivative.expiration_date: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F3 · balance_after: The Form 4 filed by the Reporting Persons on April 9, 2019 incorrectly stated the number of securities beneficially owned following the reported redemption of Preferred Units.

F4 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV A, LLC ("NGL CIV") and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism") and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar NGL Main Interco LLC ("Highstar Main") and is the managing member of NGL Prism/IV-A Blocker LLC ("NGL Blocker") and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by Highstar Prism, Highstar Main, NGL CIV and NGL Blocker.

F5 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

F6 · ownership.nature: Jared Parker is a director at the "Issuer" and co-portfolio manager at Highstar Capital IV, L.P. ("Highstar IV"). Highstar IV may be deemed to be a director by deputization as a result of its ability to appoint a director to the board of directors of the Issuer, pursuant to that certain Amended and Restated Board Representation and Observation Rights Agreement, dated as of June 24, 2016, In addition, in his capacity as co-portfolio manager at Highstar IV, Jared Parker may be deemed indirect beneficial owner of the securities held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Except to the extent of his pecuniary interest, Jared Parker disclaims beneficial ownership of the securities reported herein, and the filing of this Form 4 shall not be construed as an admission that Jared Parker is the beneficial owner of any securities covered by this Form 4.

SEC source: 0001104659-19-029375 · a4.xml · derivative · entry 1

Highstar NGL Prism/IV-A Interco LLC · CIK 0001773266 · 10% owner

Highstar NGL Main Interco LLC · CIK 0001773242 · 10% owner

NGL CIV A, LLC · CIK 0001677313 · 10% owner

NGL Prism/IV-A Blocker LLC · CIK 0001773244 · 10% owner

Highstar Capital NGL Co-Invest Manager LLC · CIK 0001773243 · 10% owner

Highstar Capital GP IV, L.P. · CIK 0001773245 · 10% owner

Highstar Capital GP IV, LLC · CIK 0001773246 · 10% owner

Highstar Capital GP IV Holdings · CIK 0001773188 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Units · 12,473,191 shares

Expires not disclosed

F1 · derivative.exercise_price: The 10.75% Class A Convertible Preferred Units (the "Preferred Units") are convertible at the quotient (the "Conversion Rate"), per unit and subject to certain adjustments, of (i) $12.035 (the "Class A Preferred Unit Price") and (ii) the Class A Preferred Unit Price; provided, however, that if the volume-weighted average trading price (the "VWAP Price") for the fifteen (15) consecutive trading days ending on the trading day immediately preceding the Initial Conversion Date is less than the Class A Preferred Unit Price (such price, the "Adjusted VWAP Price"), then at all times on and after the Initial Conversion Date, the figure used in clause (ii) shall be the greater of (A) the Adjusted VWAP Price and (B) $5.00 (subject to adjustment for any splits, combinations or recapitalizations).

F2 · kind: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F2 · derivative.exercise_date: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F2 · derivative.expiration_date: On May 10, 2019, the Issuer redeemed all outstanding Preferred Units for consideration of $13.2385 per unit.

F3 · balance_after: The Form 4 filed by the Reporting Persons on April 9, 2019 incorrectly stated the number of securities beneficially owned following the reported redemption of Preferred Units.

F4 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV A, LLC ("NGL CIV") and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism") and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar NGL Main Interco LLC ("Highstar Main") and is the managing member of NGL Prism/IV-A Blocker LLC ("NGL Blocker") and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by Highstar Prism, Highstar Main, NGL CIV and NGL Blocker.

F5 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

SEC source: 0001104659-19-020490 · a4.xml · derivative · entry 3

OAKTREE FUND GP II, L.P. · CIK 0001402869 · 10% owner

Oaktree Capital II, L.P. · CIK 0001403378 · 10% owner

Oaktree Holdings, Inc. · CIK 0001403382 · 10% owner

Oaktree Capital Group, LLC · CIK 0001403528 · 10% owner

Oaktree Capital Group Holdings GP, LLC · CIK 0001403525 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Units · 1,458,371 shares

Expires not disclosed

F9 · derivative.exercise_date: The warrants are currently exercisable.

F9 · derivative.expiration_date: The warrants are currently exercisable.

F1 · ownership.nature: Represents 412,237, 286,567, 607,654 and 151,913 common units representing limited partner interests in the Issuer ("Common Units") held of record by Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism"), Highstar NGL Main Interco LLC ("Highstar Main"), NGL CIV A, LLC ("NGL CIV") and NGL Prism/IV-A Blocker LLC ("NGL Blocker"), respectively.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

SEC source: 0001104659-19-020490 · a4.xml · derivative · entry 2

OAKTREE FUND GP II, L.P. · CIK 0001402869 · 10% owner

Oaktree Capital II, L.P. · CIK 0001403378 · 10% owner

Oaktree Holdings, Inc. · CIK 0001403382 · 10% owner

Oaktree Capital Group, LLC · CIK 0001403528 · 10% owner

Oaktree Capital Group Holdings GP, LLC · CIK 0001403525 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 17,670,501

Underlying: Common Units · 7,468,874 shares

Expires not disclosed

F4 · derivative.exercise_price: The 10.75% Class A Convertible Preferred Units (the "Preferred Units") are convertible at the quotient (the "Conversion Rate"), per unit and subject to certain adjustments, of (i) $12.035 (the "Class A Preferred Unit Price") and (ii) the Class A Preferred Unit Price; provided, however, that if the volume-weighted average trading price (the "VWAP Price") for the fifteen (15) consecutive trading days ending on the trading day immediately preceding the Initial Conversion Date is less than the Class A Preferred Unit Price (such price, the "Adjusted VWAP Price"), then at all times on and after the Initial Conversion Date, the figure used in clause (ii) shall be the greater of (A) the Adjusted VWAP Price and (B) $5.00 (subject to adjustment for any splits, combinations or recapitalizations).

F5 · kind: On April 5, 2019, the Issuer redeemed 7,468,874 Preferred Units for consideration of $13.7678 per share.

F6 · derivative.exercise_date: The Preferred Units are convertible into Common Units any time after the third anniversary (the "Initial Conversion Date") of May 11, 2016 (the "Closing Date").

F7 · derivative.exercise_date: At any time after the eighth anniversary of the Closing Date, the Issuer shall have the right to convert all of the outstanding Preferred Units into Common Units at the Conversion Rate then in effect, provided that the Issuer has paid in full all quarterly distributions on the outstanding Preferred Units and that certain conditions have been satisfied.

F6 · derivative.expiration_date: The Preferred Units are convertible into Common Units any time after the third anniversary (the "Initial Conversion Date") of May 11, 2016 (the "Closing Date").

F7 · derivative.expiration_date: At any time after the eighth anniversary of the Closing Date, the Issuer shall have the right to convert all of the outstanding Preferred Units into Common Units at the Conversion Rate then in effect, provided that the Issuer has paid in full all quarterly distributions on the outstanding Preferred Units and that certain conditions have been satisfied.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

F8 · ownership.nature: Represents 3,525,809, 2,450,979, 5,197,206 and 1,299,301 Preferred Units held of record by Highstar Prism, Highstar Main, NGL CIV and NGL Blocker, respectively.

SEC source: 0001104659-19-020490 · a4.xml · nonDerivative · entry 1

OAKTREE FUND GP II, L.P. · CIK 0001402869 · 10% owner

Oaktree Capital II, L.P. · CIK 0001403378 · 10% owner

Oaktree Holdings, Inc. · CIK 0001403382 · 10% owner

Oaktree Capital Group, LLC · CIK 0001403528 · 10% owner

Oaktree Capital Group Holdings GP, LLC · CIK 0001403525 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 1,458,371

F1 · ownership.nature: Represents 412,237, 286,567, 607,654 and 151,913 common units representing limited partner interests in the Issuer ("Common Units") held of record by Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism"), Highstar NGL Main Interco LLC ("Highstar Main"), NGL CIV A, LLC ("NGL CIV") and NGL Prism/IV-A Blocker LLC ("NGL Blocker"), respectively.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

SEC source: 0001104659-19-020481 · a4.xml · derivative · entry 3

Highstar Capital IV, L.P. · CIK 0001503547 · Director · 10% owner

Parker Jared · CIK 0001657224 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Units · 1,458,371 shares

Expires not disclosed

F10 · derivative.exercise_date: The warrants are currently exercisable.

F10 · derivative.expiration_date: The warrants are currently exercisable.

F1 · ownership.nature: Represents 412,237, 286,567, 607,654 and 151,913 common units representing limited partner interests in the Issuer ("Common Units") held of record by Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism"), Highstar NGL Main Interco LLC ("Highstar Main"), NGL CIV A, LLC ("NGL CIV") and NGL Prism/IV-A Blocker LLC ("NGL Blocker"), respectively.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

F4 · ownership.nature: Jared Parker is a director at the "Issuer" and co-portfolio manager at Highstar Capital IV, L.P. ("Highstar IV"). Highstar IV may be deemed to be a director by deputization as a result of its ability to appoint a director to the board of directors of the Issuer, pursuant to that certain Amended and Restated Board Representation and Observation Rights Agreement, dated as of June 24, 2016, In addition, in his capacity as co-portfolio manager at Highstar IV, Jared Parker may be deemed indirect beneficial owner of the securities held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Except to the extent of his pecuniary interest, Jared Parker disclaims beneficial ownership of the securities reported herein, and the filing of this Form 4 shall not be construed as an admission that Jared Parker is the beneficial owner of any securities covered by this Form 4.

SEC source: 0001104659-19-020481 · a4.xml · derivative · entry 2

Highstar Capital IV, L.P. · CIK 0001503547 · Director · 10% owner

Parker Jared · CIK 0001657224 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 17,670,501

Underlying: Common Units · 7,468,874 shares

Expires not disclosed

F5 · derivative.exercise_price: The 10.75% Class A Convertible Preferred Units (the "Preferred Units") are convertible at the quotient (the "Conversion Rate"), per unit and subject to certain adjustments, of (i) $12.035 (the "Class A Preferred Unit Price") and (ii) the Class A Preferred Unit Price; provided, however, that if the volume-weighted average trading price (the "VWAP Price") for the fifteen (15) consecutive trading days ending on the trading day immediately preceding the Initial Conversion Date is less than the Class A Preferred Unit Price (such price, the "Adjusted VWAP Price"), then at all times on and after the Initial Conversion Date, the figure used in clause (ii) shall be the greater of (A) the Adjusted VWAP Price and (B) $5.00 (subject to adjustment for any splits, combinations or recapitalizations).

F6 · kind: On April 5, 2019, the Issuer redeemed 7,468,874 Preferred Units for consideration of $13.7678 per share.

F7 · derivative.exercise_date: The Preferred Units are convertible into Common Units any time after the third anniversary (the "Initial Conversion Date") of May 11, 2016 (the "Closing Date").

F8 · derivative.exercise_date: At any time after the eighth anniversary of the Closing Date, the Issuer shall have the right to convert all of the outstanding Preferred Units into Common Units at the Conversion Rate then in effect, provided that the Issuer has paid in full all quarterly distributions on the outstanding Preferred Units and that certain conditions have been satisfied.

F7 · derivative.expiration_date: The Preferred Units are convertible into Common Units any time after the third anniversary (the "Initial Conversion Date") of May 11, 2016 (the "Closing Date").

F8 · derivative.expiration_date: At any time after the eighth anniversary of the Closing Date, the Issuer shall have the right to convert all of the outstanding Preferred Units into Common Units at the Conversion Rate then in effect, provided that the Issuer has paid in full all quarterly distributions on the outstanding Preferred Units and that certain conditions have been satisfied.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

F4 · ownership.nature: Jared Parker is a director at the "Issuer" and co-portfolio manager at Highstar Capital IV, L.P. ("Highstar IV"). Highstar IV may be deemed to be a director by deputization as a result of its ability to appoint a director to the board of directors of the Issuer, pursuant to that certain Amended and Restated Board Representation and Observation Rights Agreement, dated as of June 24, 2016, In addition, in his capacity as co-portfolio manager at Highstar IV, Jared Parker may be deemed indirect beneficial owner of the securities held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Except to the extent of his pecuniary interest, Jared Parker disclaims beneficial ownership of the securities reported herein, and the filing of this Form 4 shall not be construed as an admission that Jared Parker is the beneficial owner of any securities covered by this Form 4.

F9 · ownership.nature: Represents 3,525,809, 2,450,979, 5,197,206 and 1,299,301 Preferred Units held of record by Highstar Prism, Highstar Main, NGL CIV and NGL Blocker, respectively.

SEC source: 0001104659-19-020481 · a4.xml · nonDerivative · entry 1

Highstar Capital IV, L.P. · CIK 0001503547 · Director · 10% owner

Parker Jared · CIK 0001657224 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 1,458,371

F1 · ownership.nature: Represents 412,237, 286,567, 607,654 and 151,913 common units representing limited partner interests in the Issuer ("Common Units") held of record by Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism"), Highstar NGL Main Interco LLC ("Highstar Main"), NGL CIV A, LLC ("NGL CIV") and NGL Prism/IV-A Blocker LLC ("NGL Blocker"), respectively.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

F4 · ownership.nature: Jared Parker is a director at the "Issuer" and co-portfolio manager at Highstar Capital IV, L.P. ("Highstar IV"). Highstar IV may be deemed to be a director by deputization as a result of its ability to appoint a director to the board of directors of the Issuer, pursuant to that certain Amended and Restated Board Representation and Observation Rights Agreement, dated as of June 24, 2016, In addition, in his capacity as co-portfolio manager at Highstar IV, Jared Parker may be deemed indirect beneficial owner of the securities held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Except to the extent of his pecuniary interest, Jared Parker disclaims beneficial ownership of the securities reported herein, and the filing of this Form 4 shall not be construed as an admission that Jared Parker is the beneficial owner of any securities covered by this Form 4.

SEC source: 0001104659-19-020475 · a4.xml · derivative · entry 3

Highstar NGL Prism/IV-A Interco LLC · CIK 0001773266 · 10% owner

Highstar NGL Main Interco LLC · CIK 0001773242 · 10% owner

NGL CIV A, LLC · CIK 0001677313 · 10% owner

NGL Prism/IV-A Blocker LLC · CIK 0001773244 · 10% owner

Highstar Capital NGL Co-Invest Manager LLC · CIK 0001773243 · 10% owner

Highstar Capital GP IV, L.P. · CIK 0001773245 · 10% owner

Highstar Capital GP IV, LLC · CIK 0001773246 · 10% owner

Highstar Capital GP IV Holdings · CIK 0001773188 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Units · 1,458,371 shares

Expires not disclosed

F9 · derivative.exercise_date: The warrants are currently exercisable.

F9 · derivative.expiration_date: The warrants are currently exercisable.

F1 · ownership.nature: Represents 412,237, 286,567, 607,654 and 151,913 common units representing limited partner interests in the Issuer ("Common Units") held of record by Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism"), Highstar NGL Main Interco LLC ("Highstar Main"), NGL CIV A, LLC ("NGL CIV") and NGL Prism/IV-A Blocker LLC ("NGL Blocker"), respectively.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

SEC source: 0001104659-19-020475 · a4.xml · derivative · entry 2

Highstar NGL Prism/IV-A Interco LLC · CIK 0001773266 · 10% owner

Highstar NGL Main Interco LLC · CIK 0001773242 · 10% owner

NGL CIV A, LLC · CIK 0001677313 · 10% owner

NGL Prism/IV-A Blocker LLC · CIK 0001773244 · 10% owner

Highstar Capital NGL Co-Invest Manager LLC · CIK 0001773243 · 10% owner

Highstar Capital GP IV, L.P. · CIK 0001773245 · 10% owner

Highstar Capital GP IV, LLC · CIK 0001773246 · 10% owner

Highstar Capital GP IV Holdings · CIK 0001773188 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 17,670,501

Underlying: Common Units · 7,468,874 shares

Expires not disclosed

F4 · derivative.exercise_price: The 10.75% Class A Convertible Preferred Units (the "Preferred Units") are convertible at the quotient (the "Conversion Rate"), per unit and subject to certain adjustments, of (i) $12.035 (the "Class A Preferred Unit Price") and (ii) the Class A Preferred Unit Price; provided, however, that if the volume-weighted average trading price (the "VWAP Price") for the fifteen (15) consecutive trading days ending on the trading day immediately preceding the Initial Conversion Date is less than the Class A Preferred Unit Price (such price, the "Adjusted VWAP Price"), then at all times on and after the Initial Conversion Date, the figure used in clause (ii) shall be the greater of (A) the Adjusted VWAP Price and (B) $5.00 (subject to adjustment for any splits, combinations or recapitalizations).

F5 · kind: On April 5, 2019, the Issuer redeemed 7,468,874 Preferred Units for consideration of $13.7678 per share.

F6 · derivative.exercise_date: The Preferred Units are convertible into Common Units any time after the third anniversary (the "Initial Conversion Date") of May 11, 2016 (the "Closing Date").

F7 · derivative.exercise_date: At any time after the eighth anniversary of the Closing Date, the Issuer shall have the right to convert all of the outstanding Preferred Units into Common Units at the Conversion Rate then in effect, provided that the Issuer has paid in full all quarterly distributions on the outstanding Preferred Units and that certain conditions have been satisfied.

F6 · derivative.expiration_date: The Preferred Units are convertible into Common Units any time after the third anniversary (the "Initial Conversion Date") of May 11, 2016 (the "Closing Date").

F7 · derivative.expiration_date: At any time after the eighth anniversary of the Closing Date, the Issuer shall have the right to convert all of the outstanding Preferred Units into Common Units at the Conversion Rate then in effect, provided that the Issuer has paid in full all quarterly distributions on the outstanding Preferred Units and that certain conditions have been satisfied.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

F8 · ownership.nature: Represents 3,525,809, 2,450,979, 5,197,206 and 1,299,301 Preferred Units held of record by Highstar Prism, Highstar Main, NGL CIV and NGL Blocker, respectively.

SEC source: 0001104659-19-020475 · a4.xml · nonDerivative · entry 1

Highstar NGL Prism/IV-A Interco LLC · CIK 0001773266 · 10% owner

Highstar NGL Main Interco LLC · CIK 0001773242 · 10% owner

NGL CIV A, LLC · CIK 0001677313 · 10% owner

NGL Prism/IV-A Blocker LLC · CIK 0001773244 · 10% owner

Highstar Capital NGL Co-Invest Manager LLC · CIK 0001773243 · 10% owner

Highstar Capital GP IV, L.P. · CIK 0001773245 · 10% owner

Highstar Capital GP IV, LLC · CIK 0001773246 · 10% owner

Highstar Capital GP IV Holdings · CIK 0001773188 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 1,458,371

F1 · ownership.nature: Represents 412,237, 286,567, 607,654 and 151,913 common units representing limited partner interests in the Issuer ("Common Units") held of record by Highstar NGL Prism/IV-A Interco LLC ("Highstar Prism"), Highstar NGL Main Interco LLC ("Highstar Main"), NGL CIV A, LLC ("NGL CIV") and NGL Prism/IV-A Blocker LLC ("NGL Blocker"), respectively.

F2 · ownership.nature: Highstar Capital NGL Co-Invest Manager LLC ("Highstar Co-Invest") is the managing member of NGL CIV and as a result may be deemed to share beneficial ownership of the securities held of record by NGL CIV. Highstar Capital GP IV, L.P. ("Highstar GP IV") is one of two members of Highstar Prism and is the non-member manager of the other member. In addition, Highstar GP IV is the non-member manager of Highstar Main and is the managing member of NGL Blocker and Highstar Co-Invest. As a result, Highstar GP IV may deemed to share beneficial ownership of the securities held of record by each of the Purchasers.

F3 · ownership.nature: Oaktree Capital Group Holdings GP, LLC is the duly elected manager of Oaktree Capital Group, LLC, which is the sole shareholder of Oaktree Holdings, Inc., which is the general partner of Oaktree Capital II, L.P., which is the general partner of Oaktree Fund GP II, L.P., which is the sole shareholder of Highstar Capital GP IV Holdings, which is the sole member of Highstar Capital GP IV, LLC, which is the general partner of Highstar GP IV. Oaktree Capital Group Holdings GP, LLC is managed by an executive committee, the members of which are Howard S. Marks, Bruce A. Karsh, Jay S. Wintrob, John B. Frank and Sheldon M. Stone who, by virtue of their membership interests in Oaktree Capital Group Holdings GP, LLC, may be deemed to share voting and dispositive power with respect to the Preferred Units and Warrants held by Highstar Prism, Highstar Main, NGL CIV A, LLC and NGL Prism/IV-A Blocker LLC. Each such entity or person disclaims any such beneficial ownership of such securities.

SEC source: 0001104659-19-008690 · a4.xml · nonDerivative · entry 1

McMurray Kurston Patrick · CIK 0001707311 · GC, Exec. VP and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 71,094

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-008686 · a4.xml · nonDerivative · entry 1

Karlovich Robert W III · CIK 0001476825 · CFO, Executive VP

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,033

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-19-008691 · a4.xml · nonDerivative · entry 1

KNEALE JAMES C · CIK 0001185022 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,000

SEC source: 0001104659-19-008687 · a4.xml · nonDerivative · entry 1

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 57,368

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-18-070254 · a4.xml · nonDerivative · entry 2

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · SEE FTN

Disclosed balance after: 283,000

F1 · price: The price is the weighted average price for the common units reported on this line. The range of prices from the transactions reported on this line is between $9.5599 and $9.65. Complete information regarding the number of common units purchased at each separate price will be provided upon request by the Commission Staff, the issuer or a security holder of the issuer.

F2 · ownership.nature: These units are owned directly by Krimbill Enterprises LP, which is controlled by the Reporting Person via his ownership of its general partner, Krimbill Holding Company. The Reporting Person exercises the sole voting and disposition power for Krimbill Enterprises LP. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all the reported securities for purposes of Section 16 or any other purpose.

SEC source: 0001104659-18-069876 · a4.xml · nonDerivative · entry 1

McMurray Kurston Patrick · CIK 0001707311 · GC, Exec. VP and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,668

SEC source: 0001104659-18-069874 · a4.xml · nonDerivative · entry 1

Karlovich Robert W III · CIK 0001476825 · CFO, Executive VP

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 127,619

SEC source: 0001104659-18-069875 · a4.xml · nonDerivative · entry 1

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,131,417

SEC source: 0001104659-18-069877 · a4.xml · nonDerivative · entry 1

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,651

SEC source: 0001104659-18-068852 · a4.xml · nonDerivative · entry 1

McMurray Kurston Patrick · CIK 0001707311 · GC, SVP and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,668

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-18-068850 · a4.xml · nonDerivative · entry 1

Karlovich Robert W III · CIK 0001476825 · CFO, Executive VP

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 102,619

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This is not an open market sale of securities.

SEC source: 0001104659-18-068851 · a4.xml · nonDerivative · entry 1

KNEALE JAMES C · CIK 0001185022 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,000

F1 · ownership.direct: The units reported on this line are held by the Suzanne and Jim Kneale Living Trust ("Trust"). The Reporting Person and his spouse, Suzanne Kneale are the Trustees of that Trust.

SEC source: 0001104659-18-068853 · a4.xml · nonDerivative · entry 1

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,651

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This was not an open market sale of securities.

SEC source: 0001104659-18-057457 · a4.xml · nonDerivative · entry 2

RAYMOND JOHN T · CIK 0001186173 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

F2 · price: The price is the weighted average price for the Common Units reported on this line. The range of prices from the transactions reported on this line is between $11.025 and $11.05. Complete information regarding the number of Common Units purchased at each separate price will be provided upon request by the Commission Staff, the issuer or a security holder of the issuer.

SEC source: 0001104659-18-056573 · a4.xml · nonDerivative · entry 2

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,669

F1 · kind: The units were withheld by the Issuer to satisfy the tax withholding upon vesting of restricted units. This was not an open market sale of securities.

SEC source: 0001104659-18-056573 · a4.xml · nonDerivative · entry 1

Thuillier Lawrence J. · CIK 0001616115 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,330

SEC source: 0001104659-18-055119 · a4.xml · nonDerivative · entry 2

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · SEE FTN

Disclosed balance after: 253,000

F2 · price: The price is the weighted average price for the common units reported on this line. The range of prices from the transactions reported on this line is between $11.42 and $11.631. Complete information regarding the number of common units purchased at each separate price will be provided upon request by the Commission Staff, the issuer or a security holder of the issuer.

F3 · ownership.nature: These units are owned directly by Krimbill Enterprises LP, which is controlled by the Reporting Person via his ownership of its general partner, Krimbill Holding Company. The Reporting Person exercises the sole voting and disposition power for Krimbill Enterprises LP. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all the reported securities for purposes of Section 16 or any other purpose.

SEC source: 0001104659-18-055119 · a4.xml · nonDerivative · entry 1

KRIMBILL H MICHAEL · CIK 0001229738 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 831,417

F1 · balance_after: Adjusted to address a typographical error incorrectly stating the total number of units benefially owned by the Reporting Person that first appeared on the Form 4 filed on September 11, 2017.

SEC source: 0001104659-18-044732 · a4.xml · nonDerivative · entry 1

CROPPER STEPHEN L · CIK 0001174439 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,000