Sec Form 4 Filing - ARCH CAPITAL GROUP LTD. @ Watford Holdings Ltd. - 2021-07-01

FORM 4 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 ARCH CAPITAL GROUP LTD. 2. Issuer Name and Ticker or Trading Symbol Watford Holdings Ltd. [ WTRE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) X __ Other (specify below) See remarks (Last) (First) (Middle) 100 PITTS BAY ROAD, WATERLOO HOUSE, GROUND FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 07/01/2021 (Street) PEMBROKE, D0HM 08 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 Shares, $0.01 par value per share 07/01/2021 J( 1 ) 2,039,200 D $ 35 0 I ( 2 ) See Footnote 2

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 ARCH CAPITAL GROUP LTD. 100 PITTS BAY ROAD WATERLOO HOUSE, GROUND FLOOR PEMBROKE, D0HM 08 See remarks ARCH REINSURANCE LTD. 100 PITTS BAY ROAD WATERLOO HOUSE, 1ST FLOOR PEMBROKE, D0HM 08 See remarks Signatures /s/ Francois Morin 07/06/2021 Signature of Reporting Person Date /s/ Tim Peckett 07/06/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On July 1, 2021, in connection with the acquisition of Watford Holdings Ltd. (Watford) by Greysbridge Holdings Ltd. (Greysbridge Holdings), Arch Reinsurance Ltd. (ARL) transferred the 2,039,200 common shares of Watford owned by ARL to Greysbridge Holdings in a transaction valued at $35.00 per share. Following consummation of the acquisition and certain related transactions, Watford is a wholly owned subsidiary of Greysbridge Holdings and Arch Capital Group Ltd. indirectly owns 40% of Greysbridge Holdings. ( 2 )The reported securities were owned directly by Arch Reinsurance Ltd., a wholly owned subsidiary of Arch Capital Group Ltd.

Remarks: Prior to the transaction described in Table 1, Arch Reinsurance Ltd. was a 10% owner.

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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