Hedge Fund Adage Capital Management Loves Propetro Holding Corp. (PUMP)

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

**The number of shares of Common Stock
in this Schedule 13G gives effect to the 1.45 for 1 stock split of the Common Stock upon consummation of the Company’s offering
described in the Current Report on Form 8-K filed with the Securities and Exchange Commission on March 21, 2017.

The information required in the remainder
of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of
1934 (“Act“) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other
provisions of the Act (however, see the Notes).