Sec Form 4 Filing - Hayes Christopher M. @ XL Fleet Corp. - 2020-12-21

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 Hayes Christopher M. 2. Issuer Name and Ticker or Trading Symbol XL Fleet Corp. [ XL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O XL FLEET CORP., 145 NEWTON STREET 3. Date of Earliest Transaction (MM/DD/YY) 12/21/2020 (Street) BOSTON, MA02135 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

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 Stock Option (right to buy) $ 0.24 12/21/2020 A 95,468 12/21/2020 05/24/2018 Common Stock 95,468 ( 1 ) 95,468 D Stock Option (right to buy) $ 0.27 12/21/2020 A 286,405 12/21/2020 02/06/2030 Common Stock 286,405 ( 2 ) 286,405 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hayes Christopher M. C/O XL FLEET CORP. 145 NEWTON STREET BOSTON, MA02135 X Signatures /s/ Jenna Stewart, Attorney-in-Fact 12/23/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Received pursuant to the Agreement and Plan of Reorganization, dated as of September 17, 2020, by and among Pivotal Investment Corporation II ("Pivotal"), PIC II Merger Sub Corp., a Delaware corporation and wholly owned subsidiary of Pivotal ("Merger Sub"), and XL Hybrids, Inc., a Delaware corporation ("Legacy XL"), pursuant to which Merger Sub merged with and into Legacy XL (the "Merger"), with Legacy XL surviving as a wholly-owned subsidiary of Pivotal (which subsequently changed its name to "XL Fleet Corp.", the "Issuer"), in exchange for a stock option to acquire 126,083 shares of Legacy XL common stock for $0.18 per share. ( 2 )Received in the Merger in exchange for a stock option to acquire 378,248 shares of Legacy XL common stock for $0.20 per share.

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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