BSM

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 13

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Donald Mark DeWalch Trust

Disclosed balance after: 0

Underlying: Common and subordinated units representing LP interests · Not disclosed shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F3 · derivative.exercise_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · derivative.expiration_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · derivative.underlying_shares: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 12

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By daughter

Disclosed balance after: 0

Underlying: Common and subordinated units representing LP interests · Not disclosed shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F3 · derivative.exercise_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · derivative.expiration_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · derivative.underlying_shares: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 11

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By son

Disclosed balance after: 0

Underlying: Common and subordinated units representing LP interests · Not disclosed shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F3 · derivative.exercise_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · derivative.expiration_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · derivative.underlying_shares: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 10

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By wife

Disclosed balance after: 0

Underlying: Common and subordinated units representing LP interests · Not disclosed shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F3 · derivative.exercise_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · derivative.expiration_date: Each preferred unit may be converted at any time at the option of the holder thereof into common units at the then-effective conversion rate. In addition, each year from 2016 to 2018 a number of preferred units will automatically convert into common units and subordinated units at the then-effective conversion rate unless redeemed, as described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · derivative.underlying_shares: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 9

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Donald Mark DeWalch Trust

Disclosed balance after: 20,108

Underlying: Common units representing limited partner interests · 358 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 8

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By daughter

Disclosed balance after: 4,333

Underlying: Common units representing limited partner interests · 119 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 7

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By son

Disclosed balance after: 4,333

Underlying: Common units representing limited partner interests · 119 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-024435 · doc4.xml · derivative · entry 6

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By wife

Disclosed balance after: 3,827

Underlying: Common units representing limited partner interests · 199 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-024435 · doc4.xml · nonDerivative · entry 4

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Donald Mark DeWalch Trust

Disclosed balance after: 15,351

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · nonDerivative · entry 3

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By daughter

Disclosed balance after: 4,809

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · nonDerivative · entry 2

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By son

Disclosed balance after: 4,824

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-024435 · doc4.xml · nonDerivative · entry 1

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By wife

Disclosed balance after: 2,922

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

F1 · price: A portion of the Series A Preferred Units automatically converted into Common Units and Subordinated Units under the terms of the Limited Partnership Agreement. Each Series A Preferred Unit converted into 30.3431 Common Units and 39.7427 Subordinated Units.

SEC source: 0001209191-18-020744 · doc4.xml · derivative · entry 10

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 189,393

Underlying: Common units representing limited partner interests · 10,567 shares

Expires not disclosed

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · price: For tax withholding purposes, the value of the subordinated units was fixed at a discount to the closing price of BSM common units on March 15, 2018.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-020744 · doc4.xml · nonDerivative · entry 2

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 889,114

F1 · price: For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on March 15, 2018.

SEC source: 0001209191-18-020750 · doc4.xml · derivative · entry 2

Putman Luke Stevens · CIK 0001337171 · SVP, GC, and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,221

Underlying: Common units representing limited partner interests · 2,642 shares

Expires not disclosed

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · price: For tax withholding purposes, the value of the subordinated units was fixed at a discount to the closing price of BSM common units on March 15, 2018.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-020750 · doc4.xml · nonDerivative · entry 1

Putman Luke Stevens · CIK 0001337171 · SVP, GC, and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 302,367

F1 · price: For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on March 15, 2018.

SEC source: 0001209191-18-020748 · doc4.xml · derivative · entry 2

Morris Brock · CIK 0001623070 · SVP, Engineering and Geology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,800

Underlying: Common units representing limited partner interests · 3,455 shares

Expires not disclosed

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · price: For tax withholding purposes, the value of the subordinated units was fixed at a discount to the closing price of BSM common units on March 15, 2018.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-020748 · doc4.xml · nonDerivative · entry 1

Morris Brock · CIK 0001623070 · SVP, Engineering and Geology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 305,603

F1 · price: For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on March 15, 2018.

SEC source: 0001209191-18-020746 · doc4.xml · derivative · entry 2

Dorn Holbrook F · CIK 0001636949 · SVP, Business Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 170,684

Underlying: Common units representing limited partner interests · 4,674 shares

Expires not disclosed

F2 · derivative.exercise_price: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F3 · price: For tax withholding purposes, the value of the subordinated units was fixed at a discount to the closing price of BSM common units on March 15, 2018.

F2 · derivative.exercise_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

F2 · derivative.expiration_date: Each subordinated unit will convert into one common unit representing a limited partner interest in the Issuer at the end of the subordination period described in the Issuer's Registration Statement on Form S-1 (File No. 333-202875).

SEC source: 0001209191-18-020746 · doc4.xml · nonDerivative · entry 1

Dorn Holbrook F · CIK 0001636949 · SVP, Business Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 607,844

F1 · price: For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on March 15, 2018.

SEC source: 0001209191-18-020744 · doc4.xml · nonDerivative · entry 1

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 897,182

SEC source: 0001209191-18-017533 · doc4.xml · nonDerivative · entry 1

Stuart Alexander D. · CIK 0001639921 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 335,234

F1 · price: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions at prices ranging from $17.36 to $17.50, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-18-017535 · doc4.xml · nonDerivative · entry 1

Morris Brock · CIK 0001623070 · SVP, Engineering and Geology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 321,825

F1 · price: The price reported in Column 4 is a weighted average price. These common units were sold in multiple transactions at prices ranging from $17.25 to $17.41, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-18-015973 · doc4.xml · nonDerivative · entry 1

Smajstrla Dawn · CIK 0001499188 · VP, Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,514

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 2, 2017.

F2 · price: The price reported in Column 4 is a weighted average price. These common units were sold in multiple transactions at prices ranging from $17.12 to $17.32, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-18-015977 · doc4.xml · nonDerivative · entry 1

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 972,182

F1 · price: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions at prices ranging from $17.13 to $17.33, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-18-012630 · doc4.xml · nonDerivative · entry 3

Smajstrla Dawn · CIK 0001499188 · VP, Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,178

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012630 · doc4.xml · nonDerivative · entry 2

Smajstrla Dawn · CIK 0001499188 · VP, Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,295

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012630 · doc4.xml · nonDerivative · entry 1

Smajstrla Dawn · CIK 0001499188 · VP, Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,514

F1 · kind: Common units subject to a restricted unit award issued pursuant to the Black Stone Minerals, L.P. Long-Term Incentive Plan (the "LTIP"). Except as otherwise provided in the LTIP or the award agreement governing the award, the common units will vest in three equal installments on each of January 7, 2019, January 7, 2020, and January 7, 2021, so long as the Reporting Person remains continuously employed by the Issuer, Black Stone Minerals GP, L.L.C. (the "General Partner"), or any of their respective affiliates through each such vesting date.

SEC source: 0001209191-18-012634 · doc4.xml · nonDerivative · entry 3

Wood Jeffrey P. · CIK 0001452833 · SVP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 128,845

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012634 · doc4.xml · nonDerivative · entry 2

Wood Jeffrey P. · CIK 0001452833 · SVP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 134,362

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012634 · doc4.xml · nonDerivative · entry 1

Wood Jeffrey P. · CIK 0001452833 · SVP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,706

F1 · kind: Common units subject to a restricted unit award issued pursuant to the Black Stone Minerals, L.P. Long-Term Incentive Plan (the "LTIP"). Except as otherwise provided in the LTIP or the award agreement governing the award, the common units will vest in three equal installments on each of January 7, 2019, January 7, 2020, and January 7, 2021, so long as the Reporting Person remains continuously employed by the Issuer, Black Stone Minerals GP, L.L.C. (the "General Partner"), or any of their respective affiliates through each such vesting date.

SEC source: 0001209191-18-012616 · doc4.xml · nonDerivative · entry 3

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 957,942

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012616 · doc4.xml · nonDerivative · entry 2

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,055,039

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012616 · doc4.xml · nonDerivative · entry 1

Carter Thomas L Jr · CIK 0001319960 · Director · President, CEO and Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 808,291

F1 · kind: Common units subject to a restricted unit award issued pursuant to the Black Stone Minerals, L.P. Long-Term Incentive Plan (the "LTIP"). Except as otherwise provided in the LTIP or the award agreement governing the award, the common units will vest in three equal installments on each of January 7, 2019, January 7, 2020, and January 7, 2021, so long as the Reporting Person remains continuously employed by the Issuer, Black Stone Minerals GP, L.L.C. (the "General Partner"), or any of their respective affiliates through each such vesting date.

SEC source: 0001209191-18-012627 · doc4.xml · nonDerivative · entry 3

Putman Luke Stevens · CIK 0001337171 · SVP, GC, and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 317,520

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012627 · doc4.xml · nonDerivative · entry 2

Putman Luke Stevens · CIK 0001337171 · SVP, GC, and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 340,593

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012627 · doc4.xml · nonDerivative · entry 1

Putman Luke Stevens · CIK 0001337171 · SVP, GC, and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 273,346

F1 · kind: Common units subject to a restricted unit award issued pursuant to the Black Stone Minerals, L.P. Long-Term Incentive Plan (the "LTIP"). Except as otherwise provided in the LTIP or the award agreement governing the award, the common units will vest in three equal installments on each of January 7, 2019, January 7, 2020, and January 7, 2021, so long as the Reporting Person remains continuously employed by the Issuer, Black Stone Minerals GP, L.L.C. (the "General Partner"), or any of their respective affiliates through each such vesting date.

SEC source: 0001209191-18-012625 · doc4.xml · nonDerivative · entry 3

Morris Brock · CIK 0001623070 · SVP, Engineering and Geology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 346,825

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012625 · doc4.xml · nonDerivative · entry 2

Morris Brock · CIK 0001623070 · SVP, Engineering and Geology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 378,357

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012625 · doc4.xml · nonDerivative · entry 1

Morris Brock · CIK 0001623070 · SVP, Engineering and Geology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 292,958

F1 · kind: Common units subject to a restricted unit award issued pursuant to the Black Stone Minerals, L.P. Long-Term Incentive Plan (the "LTIP"). Except as otherwise provided in the LTIP or the award agreement governing the award, the common units will vest in three equal installments on each of January 7, 2019, January 7, 2020, and January 7, 2021, so long as the Reporting Person remains continuously employed by the Issuer, Black Stone Minerals GP, L.L.C. (the "General Partner"), or any of their respective affiliates through each such vesting date.

SEC source: 0001209191-18-012623 · doc4.xml · nonDerivative · entry 3

Dorn Holbrook F · CIK 0001636949 · SVP, Business Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 627,722

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012623 · doc4.xml · nonDerivative · entry 2

Dorn Holbrook F · CIK 0001636949 · SVP, Business Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 670,521

F2 · kind: Represents settlement of performance units awarded under the Issuer's Long-Term Incentive Plan. For tax withholding purposes, the value of the common units was deemed to be equal to the closing price of BSM common units on February 20, 2018.

SEC source: 0001209191-18-012623 · doc4.xml · nonDerivative · entry 1

Dorn Holbrook F · CIK 0001636949 · SVP, Business Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 561,759

F1 · kind: Common units subject to a restricted unit award issued pursuant to the Black Stone Minerals, L.P. Long-Term Incentive Plan (the "LTIP"). Except as otherwise provided in the LTIP or the award agreement governing the award, the common units will vest in three equal installments on each of January 7, 2019, January 7, 2020, and January 7, 2021, so long as the Reporting Person remains continuously employed by the Issuer, Black Stone Minerals GP, L.L.C. (the "General Partner"), or any of their respective affiliates through each such vesting date.

SEC source: 0001209191-18-003304 · doc4.xml · nonDerivative · entry 1

Wood Jeffrey P. · CIK 0001452833 · SVP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,069

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 5, 2017.

SEC source: 0001209191-18-003622 · doc4.xml · nonDerivative · entry 1

BARTH CARIN MARCY · CIK 0001224909 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,262

SEC source: 0001209191-18-003624 · doc4.xml · nonDerivative · entry 1

BARDEL WILLIAM G · CIK 0001223547 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 193,218

SEC source: 0001209191-18-003611 · doc4.xml · nonDerivative · entry 1

Linn Michael C · CIK 0001349033 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 64,707

SEC source: 0001209191-18-003620 · doc4.xml · nonDerivative · entry 1

DeWalch D Mark · CIK 0001638259 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,565

SEC source: 0001209191-18-003617 · doc4.xml · nonDerivative · entry 2

Haeflinger Ricky J. · CIK 0001640003 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,000

F1 · kind: Pursuant to a condition of the Reporting Person's employment that requires the Reporting Person to direct all director compensation owed to or received by the Reporting Person to his employer, the Reporting Person granted all units awarded to him to his employer.

SEC source: 0001209191-18-003617 · doc4.xml · nonDerivative · entry 1

Haeflinger Ricky J. · CIK 0001640003 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,536