Keenan W Howard JR

SEC source: 0001140361-21-038606 · form4.xml · nonDerivative · entry 4

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.17 to $23.52, 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 shares sold at each separate price within the range set forth in this footnote.

F1 · balance_after: The broker of the holder of these securities sold such shares subject to a future redemption of the underlying common units of Brigham Minerals Holdings, LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (the "Issuer"). The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-038606 · form4.xml · nonDerivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.17 to $23.52, 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 shares sold at each separate price within the range set forth in this footnote.

F1 · balance_after: The broker of the holder of these securities sold such shares subject to a future redemption of the underlying common units of Brigham Minerals Holdings, LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (the "Issuer"). The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-038606 · form4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.17 to $23.52, 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 shares sold at each separate price within the range set forth in this footnote.

F1 · balance_after: The broker of the holder of these securities sold such shares subject to a future redemption of the underlying common units of Brigham Minerals Holdings, LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (the "Issuer"). The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-038606 · form4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.17 to $23.52, 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 shares sold at each separate price within the range set forth in this footnote.

F1 · balance_after: The broker of the holder of these securities sold such shares subject to a future redemption of the underlying common units of Brigham Minerals Holdings, LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (the "Issuer"). The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F2 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-035825 · form4.xml · derivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Class A Common Stock · 0 shares

Expires not disclosed

F3 · shares: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners will be converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC will distribute to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange.

F4 · shares: The number of Solaris LLC units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person will be reported on an amendment to this Form 4 as soon as practicable once the number of Solaris LLC Units and shares of Class B common stock are determined pursuant to the Solaris LLC Agreement.

F6 · derivative.exercise_date: Subject to certain limitations and exceptions described in the Solaris LLC Agreement, the Solaris LLC Units (together with a corresponding number of shares of Class B common stock) are redeemable from time to time for shares of Class A common stock of the Issuer (on a one-for-one basis, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions).

F6 · derivative.expiration_date: Subject to certain limitations and exceptions described in the Solaris LLC Agreement, the Solaris LLC Units (together with a corresponding number of shares of Class B common stock) are redeemable from time to time for shares of Class A common stock of the Issuer (on a one-for-one basis, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions).

F3 · derivative.underlying_shares: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners will be converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC will distribute to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange.

F4 · derivative.underlying_shares: The number of Solaris LLC units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person will be reported on an amendment to this Form 4 as soon as practicable once the number of Solaris LLC Units and shares of Class B common stock are determined pursuant to the Solaris LLC Agreement.

F3 · balance_after: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners will be converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC will distribute to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange.

F4 · balance_after: The number of Solaris LLC units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person will be reported on an amendment to this Form 4 as soon as practicable once the number of Solaris LLC Units and shares of Class B common stock are determined pursuant to the Solaris LLC Agreement.

F5 · ownership.nature: Represents securities held directly by Yorktown XI. The Reporting Person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, which is the general partner of Yorktown XI. As a result, the Reporting Person may be deemed to beneficially own the securities owned by Yorktown XI. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the securities for Section 16 or any other purpose.

SEC source: 0001140361-21-035825 · form4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F2 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by stockholders generally.

F3 · shares: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners will be converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC will distribute to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange.

F4 · shares: The number of Solaris LLC units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person will be reported on an amendment to this Form 4 as soon as practicable once the number of Solaris LLC Units and shares of Class B common stock are determined pursuant to the Solaris LLC Agreement.

F3 · balance_after: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners will be converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC will distribute to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange.

F4 · balance_after: The number of Solaris LLC units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person will be reported on an amendment to this Form 4 as soon as practicable once the number of Solaris LLC Units and shares of Class B common stock are determined pursuant to the Solaris LLC Agreement.

F5 · ownership.nature: Represents securities held directly by Yorktown XI. The Reporting Person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, which is the general partner of Yorktown XI. As a result, the Reporting Person may be deemed to beneficially own the securities owned by Yorktown XI. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the securities for Section 16 or any other purpose.

SEC source: 0001140361-21-035825 · form4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,693

F1 · shares: Represents 7,693 shares of restricted stock granted under the Aris Water Solutions, Inc. 2021 Equity Incentive Plan. The restricted stock will vest in full on October 22, 2022.

SEC source: 0001140361-21-037302 · form4.xml · derivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 10,304,608

Underlying: Class A Common Stock · 10,304,608 shares

Expires not disclosed

F2 · shares: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners were converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC distributed to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange (the "VWAP").

F3 · shares: The number of Solaris LLC Units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person was determined on November 5, 2021 based on the VWAP.

F5 · derivative.exercise_date: Subject to certain limitations and exceptions described in the Solaris LLC Agreement, the Solaris LLC Units (together with a corresponding number of shares of Class B common stock) are redeemable from time to time for shares of Class A common stock of the Issuer (on a one-for-one basis, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions).

F5 · derivative.expiration_date: Subject to certain limitations and exceptions described in the Solaris LLC Agreement, the Solaris LLC Units (together with a corresponding number of shares of Class B common stock) are redeemable from time to time for shares of Class A common stock of the Issuer (on a one-for-one basis, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions).

F2 · derivative.underlying_shares: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners were converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC distributed to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange (the "VWAP").

F3 · derivative.underlying_shares: The number of Solaris LLC Units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person was determined on November 5, 2021 based on the VWAP.

F2 · balance_after: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners were converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC distributed to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange (the "VWAP").

F3 · balance_after: The number of Solaris LLC Units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person was determined on November 5, 2021 based on the VWAP.

F4 · ownership.nature: Represents securities held directly by Yorktown XI. The Reporting Person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, which is the general partner of Yorktown XI. As a result, the Reporting Person may be deemed to beneficially own the securities owned by Yorktown XI. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the securities for Section 16 or any other purpose.

SEC source: 0001140361-21-037302 · form4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 10,304,608

F1 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by stockholders generally.

F2 · shares: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners were converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC distributed to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange (the "VWAP").

F3 · shares: The number of Solaris LLC Units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person was determined on November 5, 2021 based on the VWAP.

F2 · balance_after: Immediately prior to closing of the Issuer's initial public offering, the Fourth Amended and Restated Limited Liability Company Agreement of Solaris Midstream Holdings, LLC ("Solaris LLC"), of which the Issuer is the managing member, became effective (the "Solaris LLC Agreement"). Pursuant to the Solaris LLC Agreement, (i) all of the membership interests in Solaris LLC held by its existing owners were converted into a single class of units in Solaris LLC ("Solaris LLC Units") and (ii) Solaris LLC distributed to its members, including Yorktown Energy Partners XI, L.P. ("Yorktown XI"), one share of Class B common stock for each Solaris LLC Unit held by such members, in each case based on the average of the volume weighted average price of shares of the Issuer's Class A common stock for the 10 trading days commencing with the date of the initial listing of the Issuer's Class A common stock on the New York Stock Exchange (the "VWAP").

F3 · balance_after: The number of Solaris LLC Units and shares of Class B common stock that may be deemed to be beneficially owned by the Reporting Person was determined on November 5, 2021 based on the VWAP.

F4 · ownership.nature: Represents securities held directly by Yorktown XI. The Reporting Person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, which is the general partner of Yorktown XI. As a result, the Reporting Person may be deemed to beneficially own the securities owned by Yorktown XI. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of the securities for Section 16 or any other purpose.

SEC source: 0001104659-21-125352 · tm2129793-8_4seq1.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 331,856

SEC source: 0001104659-21-125354 · tm2129790-3_4seq1.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,340

SEC source: 0001140361-21-030217 · form4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,340,062

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.60 to $13.93, inclusive. The reporting person undertakes to provide to the Antero Resources Corporation (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 shares sold at each separate price within the range set forth in this footnote.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F3 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII.

SEC source: 0001140361-21-029779 · form4.xml · nonDerivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,417,557

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.70 to $14.02, 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 shares sold at each separate price within the range set forth in this footnote.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F3 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII.

SEC source: 0001140361-21-029779 · form4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,682,570

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.05 to $14.00, 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 shares sold at each separate price within the range set forth in this footnote.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F3 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII.

SEC source: 0001140361-21-029779 · form4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 9,282,570

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.86 to $13.15, inclusive. The reporting person undertakes to provide to the Antero Resources Corporation (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 shares sold at each separate price within the range set forth in this footnote.

F2 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F3 · ownership.nature: These securities are owned directly by Yorktown Energy Partners VIII, L.P. ("Yorktown VIII"). The reporting person is a member and manager of Yorktown VIII Associates LLC, the general partner of Yorktown VIII Company LP, the general partner of Yorktown VIII.

SEC source: 0001179110-21-008431 · edgar.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,446

F1 · shares: Restricted Stock Award pursuant to the Solaris Oilfield Infrastructure, Inc. Long Term Incentive Plan. The award vests in full on the first anniversary of the grant date.

SEC source: 0001140361-21-024596 · form4.xml · derivative · entry 17

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,060,570

Underlying: Class A Common Stock · 37,632 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.exercise_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.expiration_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-024596 · form4.xml · derivative · entry 16

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 531,668

Underlying: Class A Common Stock · 18,864 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.exercise_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.expiration_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-024596 · form4.xml · derivative · entry 15

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,321,449

Underlying: Class A Common Stock · 46,890 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.exercise_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.expiration_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-024596 · form4.xml · derivative · entry 14

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 128,741

Underlying: Class A Common Stock · 4,568 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.exercise_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F2 · derivative.expiration_date: As previously reported on the Form 4 filed on June 23, 2021 (the "June Form-4") the broker of the holder of these securities sold a number of shares of Class A common stock subject to a future Redemption of the underlying common units of Brigham LLC and cancellation of an equal amount of shares of Class B common stock of Brigham Minerals, Inc. (collectively, a "Future Redemption"). On July 14, 2021, all such Redemptions were effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 12

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F8 · price: These shares were sold in multiple transactions at varying prices specified in the June Form-4.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 11

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 37,632

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.

F12 · price: On June 25, 2021, YT Brigham requested that 37,632 shares of Class B common stock and 37,632 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 37,632 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 10

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,060,570

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F12 · price: On June 25, 2021, YT Brigham requested that 37,632 shares of Class B common stock and 37,632 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 37,632 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 9

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F8 · price: These shares were sold in multiple transactions at varying prices specified in the June Form-4.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 8

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 18,864

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.

F11 · price: On June 25, 2021, Yorktown XI requested that 18,864 shares of Class B common stock and 18,864 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 18,864 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 7

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 531,668

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F11 · price: On June 25, 2021, Yorktown XI requested that 18,864 shares of Class B common stock and 18,864 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 18,864 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 6

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F8 · price: These shares were sold in multiple transactions at varying prices specified in the June Form-4.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 5

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 46,890

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.

F10 · price: On June 25, 2021, Yorktown X requested that 46,890 shares of Class B common stock and 46,890 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 46,890 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 4

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,321,449

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F10 · price: On June 25, 2021, Yorktown X requested that 46,890 shares of Class B common stock and 46,890 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 46,890 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 3

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F8 · price: These shares were sold in multiple transactions at varying prices specified in the June Form-4.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 2

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 4,568

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.

F9 · price: On June 25, 2021, Yorktown IX requested that 4,568 shares of Class B common stock and 4,568 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 4,568 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-024596 · form4.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 128,741

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F9 · price: On June 25, 2021, Yorktown IX requested that 4,568 shares of Class B common stock and 4,568 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 4,568 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001104659-21-091777 · tm2122030-3_4seq1.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 329,421

SEC source: 0001104659-21-091785 · tm2122029-2_4seq1.xml · nonDerivative · entry 1

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,378

SEC source: 0001140361-21-022749 · form4.xml · derivative · entry 33

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,098,202

Underlying: Class A Common Stock · 394,680 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-022749 · form4.xml · derivative · entry 32

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 550,532

Underlying: Class A Common Stock · 197,854 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-022749 · form4.xml · derivative · entry 31

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,368,339

Underlying: Class A Common Stock · 491,762 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-022749 · form4.xml · derivative · entry 30

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 133,309

Underlying: Class A Common Stock · 47,912 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: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.exercise_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F1 · derivative.expiration_date: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 24

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F13 · price: Such units were sold in multiple transactions by the broker of the holder of these securities at varying prices specified in the Form-4s filed on May 20, 2021, May 24, 2021, May 27, 2021, June 2, 2021, June 8, 2021, June 11, 2021 and June 23, 2021, and all subject to a Future Redemption. On June 25, 2021, such Future Redemption was effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 23

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 394,680

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.

F17 · price: On June 18, 2021, YT Brigham requested that 394,680 shares of Class B common stock and 394,680 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 394,680 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 22

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,098,202

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F17 · price: On June 18, 2021, YT Brigham requested that 394,680 shares of Class B common stock and 394,680 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 394,680 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F7 · ownership.nature: These securities are owned directly by YT Brigham Co Investment Partners, LP ("YT Brigham"). The reporting person is a member and manager of YT Brigham Associates LLC, the general partner of YT Brigham Company LP, the general partner of YT Brigham.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 21

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F13 · price: Such units were sold in multiple transactions by the broker of the holder of these securities at varying prices specified in the Form-4s filed on May 20, 2021, May 24, 2021, May 27, 2021, June 2, 2021, June 8, 2021, June 11, 2021 and June 23, 2021, and all subject to a Future Redemption. On June 25, 2021, such Future Redemption was effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 20

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 197,854

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.

F16 · price: On June 18, 2021, Yorktown XI requested that 197,854 shares of Class B common stock and 197,854 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 197,854 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 19

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 550,532

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F16 · price: On June 18, 2021, Yorktown XI requested that 197,854 shares of Class B common stock and 197,854 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 197,854 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F6 · ownership.nature: These securities are owned directly by Yorktown Energy Partners XI, L.P. ("Yorktown XI"). The reporting person is a member and manager of Yorktown XI Associates LLC, the general partner of Yorktown XI Company LP, the general partner of Yorktown XI.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 18

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F13 · price: Such units were sold in multiple transactions by the broker of the holder of these securities at varying prices specified in the Form-4s filed on May 20, 2021, May 24, 2021, May 27, 2021, June 2, 2021, June 8, 2021, June 11, 2021 and June 23, 2021, and all subject to a Future Redemption. On June 25, 2021, such Future Redemption was effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 17

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 491,762

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.

F15 · price: On June 18, 2021, Yorktown X requested that 491,762 shares of Class B common stock and 491,762 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 491,762 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 16

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,368,339

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F15 · price: On June 18, 2021, Yorktown X requested that 491,762 shares of Class B common stock and 491,762 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 491,762 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F5 · ownership.nature: These securities are owned directly by Yorktown Energy Partners X, L.P. ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 15

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F13 · price: Such units were sold in multiple transactions by the broker of the holder of these securities at varying prices specified in the Form-4s filed on May 20, 2021, May 24, 2021, May 27, 2021, June 2, 2021, June 8, 2021, June 11, 2021 and June 23, 2021, and all subject to a Future Redemption. On June 25, 2021, such Future Redemption was effected.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 14

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 47,912

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.

F14 · price: On June 18, 2021, Yorktown IX requested that 47,912 shares of Class B common stock and 47,912 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 47,912 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.

SEC source: 0001140361-21-022749 · form4.xml · nonDerivative · entry 13

Keenan W Howard JR · CIK 0001370287 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 133,309

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 · security: Each share of Class B common stock has no economic rights but entitles its holder to one vote on all matters to be voted on by shareholders generally. At the request of the holder, each common unit (each, a "Common Unit") of Brigham Minerals Holdings, LLC ("Brigham LLC") may be coupled with a share of Class B common stock and redeemed for, at Brigham LLC's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to a volume weighted average closing price of one share of Class A common stock for each Common Unit redeemed for the 10 trading days prior to the date the holder requests redemption (each, a "Redemption"). The Common Units do not expire.

F14 · price: On June 18, 2021, Yorktown IX requested that 47,912 shares of Class B common stock and 47,912 Common Units be redeemed, and Brigham LLC elected to redeem such securities for an aggregate of 47,912 shares of Class A common stock.

F3 · balance_after: The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose.

F4 · ownership.nature: These securities are owned directly by Yorktown Energy Partners IX, L.P. ("Yorktown IX"). The reporting person is a member and manager of Yorktown IX Associates LLC, the general partner of Yorktown IX Company LP, the general partner of Yorktown IX.