PUMP

SEC source: 0001680247-18-000035 · wf-form4_152425453523704.xml · nonDerivative · entry 1

Smith Jeffrey Donald · CIK 0001700680 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 103,015

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on April 18, 2019.

SEC source: 0001680247-18-000039 · wf-form4_152425468271101.xml · derivative · entry 2

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 144,823

Underlying: Common Stock · 72,254 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-18-000039 · wf-form4_152425468271101.xml · nonDerivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 528,305

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on April 18, 2019.

SEC source: 0001680247-18-000037 · wf-form4_152425461068624.xml · derivative · entry 2

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,226

Underlying: Common Stock · 26,012 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-18-000037 · wf-form4_152425461068624.xml · nonDerivative · entry 1

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,226

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on April 18, 2019.

SEC source: 0001680247-18-000038 · wf-form4_152425462859246.xml · derivative · entry 2

Denholm Ian Charles · CIK 0001715482 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,058

Underlying: Common Stock · 5,058 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-18-000038 · wf-form4_152425462859246.xml · nonDerivative · entry 1

Denholm Ian Charles · CIK 0001715482 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,122

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on April 18, 2019.

SEC source: 0001680247-18-000036 · wf-form4_152425458657708.xml · derivative · entry 2

Howell Mark Christopher · CIK 0001700732 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,484

Underlying: Common Stock · 17,341 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2020, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-18-000036 · wf-form4_152425458657708.xml · nonDerivative · entry 1

Howell Mark Christopher · CIK 0001700732 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,484

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on April 18, 2019.

SEC source: 0001680247-18-000024 · wf-form4_152235370777702.xml · nonDerivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 456,051

F1 · shares: Reflects shares withheld to satisfy taxes payable in connection with the vesting of previously awarded restricted stock units.

SEC source: 0001680247-18-000011 · wf-form4_151751934495006.xml · nonDerivative · entry 1

BEST ANTHONY JAMES · CIK 0001364843 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,406

F1 · price: Represents restricted share units which will vest in full upon the earlier to occur of the company's next annual meeting of shareholders or January 31, 2019.

SEC source: 0001680247-18-000003 · wf-form4_151579369802588.xml · nonDerivative · entry 1

Blackwell Pryor · CIK 0001725553 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,428

F1 · price: Represents restricted stock units which will vest in full upon the earlier to occur of the day immediately preceding the company's next annual meeting of shareholders or January 12, 2019.

SEC source: 0001104659-17-067971 · a4.xml · nonDerivative · entry 1

ENERGY CAPITAL PARTNERS II, LLC · CIK 0001558915 · 10% owner

Energy Capital Partners GP II, LP · CIK 0001700831 · 10% owner

ENERGY CAPITAL PARTNERS II, LP · CIK 0001456360 · 10% owner

ENERGY CAPITAL PARTNERS II-A, LP · CIK 0001456364 · 10% owner

ENERGY CAPITAL PARTNERS II-B, LP · CIK 0001456359 · 10% owner

Energy Capital Partners II-C (Direct IP), LP · CIK 0001700624 · 10% owner

ENERGY CAPITAL PARTNERS II-D, LP · CIK 0001483784 · 10% owner

Energy Capital Partners II (Midland Co-Invest), LP · CIK 0001575667 · 10% owner

Energy Capital Partners GP II Co-Investment (Midland), LLC · CIK 0001700832 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 20,727,928

F1 · ownership.nature: Following the transaction reported herein, includes (i) 310,422 shares held by Energy Capital Partners II, LP ("ECP II"), (ii) 10,111,599 shares held by Energy Capital Partners II-A, LP ("ECP II-A"), (iii) 2,117,308 shares held by Energy Capital Partners II-B, LP ("ECP II-B"), (iv) 3,719,251 shares held by Energy Capital Partners II-C (Direct IP), LP ("ECP II-C"), (v) 2,492,098 shares held by Energy Capital Partners II-D, LP ("ECP II-D"), and (vi) 1,977,250 shares held by Energy Capital Partners II (Midland Co-Invest), LP ("ECP Co-Invest"). Each of ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D is managed by its general partner, Energy Capital Partners GP II, LP. Energy Capital Partners GP II, LP is managed by its general partner, Energy Capital Partners II, LLC ("Energy Capital Partners"). ECP Co-Invest is managed by its general partner, Energy Capital Partners GP II Co-Investment (Midland), LLC, which is managed by its sole member, Energy Capital Partners.

F2 · ownership.nature: As a result, each of Energy Capital Partners GP II, LP and Energy Capital Partners may be deemed to share beneficial ownership of the shares held by ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D, and each of Energy Capital Partners GP II Co-Investment (Midland), LLC and Energy Capital Partners may be deemed to share beneficial ownership of the shares held by ECP Co-Invest. Douglas W. Kimmelman, Peter Labbat, Thomas K. Lane, Tyler Reeder and Andrew D. Singer are the managing members of, and Rahman D'Argenio is a partner of, Energy Capital Partners and share the power to direct the voting and disposition of the shares beneficially owned by Energy Capital Partners. Each such individual disclaims beneficial ownership of such shares except to the extent of their pecuniary interest therein.

SEC source: 0001680247-17-000034 · wf-form4_149678325844101.xml · nonDerivative · entry 1

BEAL STEVEN L · CIK 0001034315 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,558

F1 · price: Represents restricted stock units which will vest in full upon the earlier to occur of the day immediately preceding the company's next annual meeting of shareholders or June 5, 2018.

SEC source: 0001680247-17-000031 · wf-form4_149678319697068.xml · derivative · entry 2

Smith Jeffrey Donald · CIK 0001700680 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,214

Underlying: Common Stock · 27,214 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · balance_after: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-17-000031 · wf-form4_149678319697068.xml · nonDerivative · entry 1

Smith Jeffrey Donald · CIK 0001700680 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,113

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on June 5, 2018.

SEC source: 0001680247-17-000035 · wf-form4_149678329118661.xml · derivative · entry 2

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,569

Underlying: Common Stock · 72,569 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · balance_after: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-17-000035 · wf-form4_149678329118661.xml · nonDerivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 612,774

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on June 5, 2018.

SEC source: 0001680247-17-000033 · wf-form4_149678323962877.xml · nonDerivative · entry 1

Armour Spencer D III · CIK 0001399885 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,558

F1 · price: Represents restricted stock units which will vest in full upon the earlier to occur of the day immediately preceding the company's next annual meeting of shareholders or June 5, 2018.

SEC source: 0001680247-17-000036 · wf-form4_149678331745775.xml · nonDerivative · entry 1

MOORE JACK B · CIK 0001235129 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,558

F1 · price: Represents restricted stock units which will vest in full upon the earlier to occur of the day immediately preceding the company's next annual meeting of shareholders or June 5, 2018.

SEC source: 0001680247-17-000030 · wf-form4_149678317353762.xml · derivative · entry 2

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,214

Underlying: Common Stock · 27,214 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · balance_after: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-17-000030 · wf-form4_149678317353762.xml · nonDerivative · entry 1

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,214

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on June 5, 2018.

SEC source: 0001680247-17-000032 · wf-form4_149678321813347.xml · nonDerivative · entry 1

Douglas Alan Eugene · CIK 0001700687 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,558

F1 · price: Represents restricted stock units which will vest in full upon the earlier to occur of the day immediately preceding the company's next annual meeting of shareholders or June 5, 2018.

SEC source: 0001680247-17-000029 · wf-form4_149678315362011.xml · derivative · entry 2

Howell Mark Christopher · CIK 0001700732 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,143

Underlying: Common Stock · 18,143 shares

Expires not disclosed

F2 · derivative.exercise_price: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.exercise_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.expiration_date: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · derivative.underlying_shares: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

F2 · balance_after: Each performance stock unit represents a contingent right to receive up to two shares of common stock. Amount indicated reflects the target number of performance stock units awarded pursuant to the 2017 Incentive Award Plan. Following the completion of the performance period on December 31, 2019, the reporting person will receive the pro rata portion of the target award that corresponds with the company's attainment of total shareholder return relative to the company's peer group.

SEC source: 0001680247-17-000029 · wf-form4_149678315362011.xml · nonDerivative · entry 1

Howell Mark Christopher · CIK 0001700732 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,143

F1 · price: Represents restricted stock units which will vest in three substantially equal annual installments commencing on June 5, 2018.

SEC source: 0001104659-17-020381 · a4.xml · nonDerivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 167,870

SEC source: 0001104659-17-020373 · a4.xml · nonDerivative · entry 1

ENERGY CAPITAL PARTNERS II, LLC · CIK 0001558915 · 10% owner

ENERGY CAPITAL PARTNERS II, LP · CIK 0001456360 · 10% owner

ENERGY CAPITAL PARTNERS II-A, LP · CIK 0001456364 · 10% owner

ENERGY CAPITAL PARTNERS II-B, LP · CIK 0001456359 · 10% owner

Energy Capital Partners II-C (Direct IP), LP · CIK 0001700624 · 10% owner

ENERGY CAPITAL PARTNERS II-D, LP · CIK 0001483784 · 10% owner

Energy Capital Partners II (Midland Co-Invest), LP · CIK 0001575667 · 10% owner

Energy Capital Partners GP II Co-Investment (Midland), LLC · CIK 0001700832 · 10% owner

Energy Capital Partners GP II, LP · CIK 0001700831 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 34,527,928

F1 · balance_after: Following the transaction reported herein, includes (i) 517,092 shares held by Energy Capital Partners II, LP ("ECP II"), (ii) 16,843,582 shares held by Energy Capital Partners II-A, LP ("ECP II-A"), (iii) 3,526,945 shares held by Energy Capital Partners II-B, LP ("ECP II-B"), (iv) 6,195,410 shares held by Energy Capital Partners II-C (Direct IP), LP ("ECP II-C"), (v) 4,151,258 shares held by Energy Capital Partners II-D, LP ("ECP II-D"), and (vi) 3,293,641 shares held by Energy Capital Partners II (Midland Co-Invest), LP ("ECP Co-Invest"). Each of ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D is managed by its general partner, Energy Capital Partners GP II, LP. Energy Capital Partners GP II, LP is managed by its general partner, Energy Capital Partners II, LLC ("Energy Capital Partners"). ECP Co-Invest is managed by its general partner, Energy Capital Partners GP II Co-Investment (Midland), LLC, which is managed by its sole member, Energy Capital Partners.

F1 · ownership.nature: Following the transaction reported herein, includes (i) 517,092 shares held by Energy Capital Partners II, LP ("ECP II"), (ii) 16,843,582 shares held by Energy Capital Partners II-A, LP ("ECP II-A"), (iii) 3,526,945 shares held by Energy Capital Partners II-B, LP ("ECP II-B"), (iv) 6,195,410 shares held by Energy Capital Partners II-C (Direct IP), LP ("ECP II-C"), (v) 4,151,258 shares held by Energy Capital Partners II-D, LP ("ECP II-D"), and (vi) 3,293,641 shares held by Energy Capital Partners II (Midland Co-Invest), LP ("ECP Co-Invest"). Each of ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D is managed by its general partner, Energy Capital Partners GP II, LP. Energy Capital Partners GP II, LP is managed by its general partner, Energy Capital Partners II, LLC ("Energy Capital Partners"). ECP Co-Invest is managed by its general partner, Energy Capital Partners GP II Co-Investment (Midland), LLC, which is managed by its sole member, Energy Capital Partners.

F2 · ownership.nature: As a result, each of Energy Capital Partners GP II, LP and Energy Capital Partners may be deemed to share beneficial ownership of the shares held by ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D, and each of Energy Capital Partners GP II Co-Investment (Midland), LLC and Energy Capital Partners may be deemed to share beneficial ownership of the shares held by ECP Co-Invest. Douglas W. Kimmelman, Peter Labbat, Thomas K. Lane, Tyler Reeder and Andrew D. Singer are the managing members of, and Rahman D'Argenio is a partner of, Energy Capital Partners and share the power to direct the voting and disposition of the shares beneficially owned by Energy Capital Partners. Each such individual disclaims beneficial ownership of such shares except to the extent of their pecuniary interest therein.

SEC source: 0001104659-17-020375 · a4.xml · nonDerivative · entry 1

Armour Spencer D III · CIK 0001399885 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

SEC source: 0001104659-17-020377 · a4.xml · nonDerivative · entry 1

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

SEC source: 0001104659-17-020379 · a4.xml · nonDerivative · entry 1

Smith Jeffrey C · CIK 0001362697 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,899

SEC source: 0001104659-17-019164 · a4.xml · derivative · entry 2

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 372,335

Underlying: Common Stock · 372,335 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to recieve one share of common stock.

F2 · derivative.exercise_date: Upon consummation of the Issuer's initial public offering ("IPO"), the restricted stock units held by the reporting person prior to the IPO were cancelled in exchange for an equal number of restricted stock units (the "New RSUs"). The New RSUs will vest on March 22, 2018 and have no expiration date.

F2 · derivative.expiration_date: Upon consummation of the Issuer's initial public offering ("IPO"), the restricted stock units held by the reporting person prior to the IPO were cancelled in exchange for an equal number of restricted stock units (the "New RSUs"). The New RSUs will vest on March 22, 2018 and have no expiration date.

SEC source: 0001104659-17-019164 · a4.xml · derivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 372,335 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a right to recieve one share of common stock.

F2 · derivative.exercise_date: Upon consummation of the Issuer's initial public offering ("IPO"), the restricted stock units held by the reporting person prior to the IPO were cancelled in exchange for an equal number of restricted stock units (the "New RSUs"). The New RSUs will vest on March 22, 2018 and have no expiration date.

F2 · derivative.expiration_date: Upon consummation of the Issuer's initial public offering ("IPO"), the restricted stock units held by the reporting person prior to the IPO were cancelled in exchange for an equal number of restricted stock units (the "New RSUs"). The New RSUs will vest on March 22, 2018 and have no expiration date.

SEC source: 0001104659-17-019166 · a4.xml · nonDerivative · entry 1

ENERGY CAPITAL PARTNERS II, LLC · CIK 0001558915 · 10% owner

Energy Capital Partners GP II, LP · CIK 0001700831 · 10% owner

ENERGY CAPITAL PARTNERS II-A, LP · CIK 0001456364 · 10% owner

ENERGY CAPITAL PARTNERS II-B, LP · CIK 0001456359 · 10% owner

Energy Capital Partners II-C (Direct IP), LP · CIK 0001700624 · 10% owner

ENERGY CAPITAL PARTNERS II-D, LP · CIK 0001483784 · 10% owner

Energy Capital Partners II (Midland Co-Invest), LP · CIK 0001575667 · 10% owner

Energy Capital Partners GP II Co-Investment (Midland), LLC · CIK 0001700832 · 10% owner

ENERGY CAPITAL PARTNERS II, LP · CIK 0001456360 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 37,299,485

F1 · balance_after: Following the transaction reported herein, includes (i) 558,599 shares held by Energy Capital Partners II, LP ("ECP II"), (ii) 18,195,616 shares held by Energy Capital Partners II-A, LP ("ECP II-A"), (iii) 3,810,053 shares held by Energy Capital Partners II-B, LP ("ECP II-B"), (iv) 6,692,716 shares held by Energy Capital Partners II-C (Direct IP), LP ("ECP II-C"), (v) 4,484,480 shares held by Energy Capital Partners II-D, LP ("ECP II-D"), and (vi) 3,558,021 shares held by Energy Capital Partners II (Midland Co-Invest), LP ("ECP Co-Invest"). Each of ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D is managed by its general partner, Energy Capital Partners GP II, LP. Energy Capital Partners GP II, LP is managed by its general partner, Energy Capital Partners II, LLC ("Energy Capital Partners"). ECP Co-Invest is managed by its general partner, Energy Capital Partners GP II Co-Investment (Midland), LLC, which is managed by its sole member, Energy Capital Partners.

F2 · ownership.nature: As a result, each of Energy Capital Partners GP II, LP and Energy Capital Partners may be deemed to share beneficial ownership of the shares held by ECP II, ECP II-A, ECP II-B, ECP II-C and ECP II-D, and each of Energy Capital Partners GP II Co-Investment (Midland), LLC and Energy Capital Partners may be deemed to share beneficial ownership over the shares held by ECP Co-Invest. Douglas W. Kimmelman, Peter Labbat, Thomas K. Lane, Tyler Reeder and Andrew D. Singer are the managing members of, and Rahman D'Argenio is a partner of, Energy Capital Partners and share the power to direct the voting and disposition of the shares beneficially owned by Energy Capital Partners. Each such individual disclaims beneficial ownership of such shares except to the extent of their pecuniary interest therein.

SEC source: 0001680247-17-000028 · wf-form4a_149678292561690.xml · nonDerivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 910,575

F1 · security: Originally reported as a transaction in a derivative security, this amendment is filed to recategorize as a non-derivative transaction.

F2 · price: Represents restricted stock units which will vest in full on March 22, 2018.

SEC source: 0001104659-17-018073 · a4.xml · derivative · entry 1

Smith Jeffrey Donald · CIK 0001700680 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,988

Underlying: Common Stock · 119,988 shares

Expires 2027-03-16

F1 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 16, 2018.

SEC source: 0001104659-17-018068 · a4.xml · derivative · entry 1

Redman Dale Jackie · CIK 0001700738 · Director · CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,988

Underlying: Common Stock · 119,988 shares

Expires 2027-03-16

F1 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 16, 2018.

SEC source: 0001104659-17-018075 · a4.xml · derivative · entry 3

Armour Spencer D III · CIK 0001399885 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 586,755

Underlying: Common Stock · 113,097 shares

Expires 2023-06-14

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_date: Represents stock options which have vested or will vest in four equal annual installments beginning on June 14, 2014.

SEC source: 0001104659-17-018075 · a4.xml · nonDerivative · entry 2

Armour Spencer D III · CIK 0001399885 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,106

SEC source: 0001104659-17-018075 · a4.xml · nonDerivative · entry 1

Armour Spencer D III · CIK 0001399885 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,097

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.

SEC source: 0001104659-17-018071 · a4.xml · derivative · entry 4

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 586,755

Underlying: Common Stock · 113,097 shares

Expires 2023-06-14

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

F2 · derivative.exercise_date: Represents stock options which have vested or will vest in four equal annual installments beginning on June 14, 2014.

SEC source: 0001104659-17-018071 · a4.xml · derivative · entry 3

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,988

Underlying: Common Stock · 119,988 shares

Expires 2027-03-16

F1 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 16, 2018.

SEC source: 0001104659-17-018071 · a4.xml · nonDerivative · entry 2

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,106

SEC source: 0001104659-17-018071 · a4.xml · nonDerivative · entry 1

SLEDGE DAVID W · CIK 0001232886 · COO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,097

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.

SEC source: 0001104659-17-018069 · a4.xml · derivative · entry 1

Howell Mark Christopher · CIK 0001700732 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,750

Underlying: Common Stock · 21,750 shares

Expires 2027-03-16

F1 · derivative.exercise_date: The option vests in four equal annual installments beginning on March 16, 2018.