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☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period fromtoCommission File Number: 001-38035 ProPetro Holding Corp. (Exact name of registrant as specified in its charter)______________________________ 303 W. Wall Street, Suite 102, Midland, Texas 79701(Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: (432) 688-0012 Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.YesýNo¨Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.Yes¨Noý Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 duringthe preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements forthe past 90 days.YesýNo¨ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles).YesýNo¨ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerginggrowth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule12b-2 of the Exchange Act. Large accelerated filerýAccelerated filer☐Non-accelerated filer☐(Do not check if a smaller reporting company)Smaller reporting company☐Emerging growth company☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new orrevised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control overfinancial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its auditreport.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filingreflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received byany of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ TABLE OF CONTENTS FORWARD-LOOKING STATEMENTS.......................................................................................................iSUMMARY OF RISK FACTORS..................................................................................................................iii PART I BUSINESS.......................................................................................................................................................1RISK FACTORS..............................................................................................................................................15UNRESOLVED STAFF COMMENTS...........................................................................................................33CYBERSECURITY.........................................................................................................................................33PROPERTIES..................................................................................................................................................34LEGAL PROCEEDINGS................................................................................................................................34MINE SAFETY DISCLOSURES....................................................................................................................34 PART II MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDERMATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES..................................................34SELECTED FINANCIAL DATA...................................................................................................................36MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION ANDRESULTS OF OPERATIONS.................................................................................................................37QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK................................56FINANCIAL STATEMENTS AND SUP