Sec Form 3 Filing - Platinum InvestCo (Cayman), LLC @ KEY ENERGY SERVICES INC - 2018-12-31

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Platinum InvestCo (Cayman), LLC 2. Issuer Name and Ticker or Trading Symbol KEY ENERGY SERVICES INC [ KEG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O PLATINUM EQUITY ADVISORS, LLC, 360 NORTH CRESCENT DRIVE, SOUTH BUILDING 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2018 (Street) BEVERLY HILLS, CA90210 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 10,309,609 ( 1 ) ( 2 ) ( 3 ) ( 4 ) ( 5 ) ( 6 ) I See footnotes. ( 2 ) ( 3 ) ( 4 ) ( 5 ) ( 6 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Platinum InvestCo (Cayman), LLC C/O PLATINUM EQUITY ADVISORS, LLC 360 NORTH CRESCENT DRIVE, SOUTH BUILDING BEVERLY HILLS, CA90210 X Signatures See Exhibit 99.1-Signatures 03/18/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The 10,309,609 shares of common stock is the amount the reporting person may be deemed to beneficially own as of the date of this filing. On December 31, 2018, the date of the internal restructuring described below, the reporting persons may have been deemed to beneficially own 9,800,630 shares of common stock. ( 2 )Includes 9,800,630 shares issued to Soter Capital, LLC ("Soter) in connection with issuer's emergence from bankruptcy on December 15, 2016 and Soter's participation in the related rights offering. ( 3 )Soter Capital Holdings, LLC ("SCH") is the sole member of Soter and may be deemed to beneficially own the common stock beneficially owned by Soter. PE Soter Holdings, LLC ("PESH") holds a majority membership interest in SCH and may be deemed to beneficially own the common stock beneficially owned by SCH. Platinum Equity Capital Soter Partners, L.P. ("PECSP") holds a majority membership interest in PESH and may be deemed to beneficially own the common stock beneficially owned by PESH. Platinum Equity Partners III, LLC ("PEP III") is the general partner of PECSP and may be deemed to beneficially own the common stock beneficially owned by PECSP. ( 4 )(Continued from Footnote 3) Platinum Equity Investment Holdings III, LLC ("PEIH III") is the senior managing member of PEP III and may be deemed to beneficially own the common stock beneficially owned by PEP III. Platinum Equity InvestCo, L.P. ("PEI LP") owns all of the economic interests in PEIH III and may be deemed to beneficially own the common stock beneficially owned by PEIH III. Platinum Equity Investment Holdings IC (Cayman), LLC ("PEIH IC LLC") is the general partner of PEI LP and may be deemed to beneficially own the common stock beneficially owned by PEI LP. Platinum InvestCo (Cayman), LLC ("PIC LLC") holds a controlling interest in PEI LP and may be deemed to beneficially own common stock beneficially owned by PEI LP. ( 5 )(Continued from Footnote 4) Platinum Equity Investment Holdings, LLC ("PEIH LLC") is the sole member of PEIH IC LLC and may be deemed to beneficially own the common stock beneficially owned by PEIH IC LLC. Platinum Equity Investment Holdings III Manager, LLC ("PEIH III Manager") is the sole manager of PEIH III and may be deemed to beneficially own the common stock beneficially owned by PEIH III. Platinum Equity, LLC ("Platinum Equity") is the sole member of PEIH III Manager and PEIH LLC and may be deemed to beneficially own the common stock beneficially owned by each of PEIH III Manager and PEIH LLC. Platinum Equity and Tom Gores, together, hold a controlling interest in PIC LLC and may be deemed to beneficially own the common stock beneficially owned by PIC LLC. ( 6 )(Continued from Footnote 5) Tom Gores is the Chairman and Chief Executive Officer of Platinum Equity and may be deemed to beneficially own the common stock beneficially owned by Platinum Equity. Mr. Gores disclaims beneficial ownership of all the shares of common stock held by each of the entities listed above with respect to which he does not have a pecuniary interest.

Remarks: On December 31, 2018, as part of an internal restructuring by certain of the entities described above, PIC LLC obtained a controlling interest in PEI LP. As a result, PIC LLC may be deemed to beneficially own the common stock beneficially owned by PEI LP. The internal restructuring did not change or have any effect on the pecuniary interests of any other entity.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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