Sec Form 4 Filing - Hynes Thomas J. III @ 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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Hynes Thomas J. III 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 X __ Officer (give title below) _____ Other (specify below) President (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 Common Stock 12/21/2020 A 6,181,461 A 6,181,461 D

D 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 595,111 ( 2 ) 05/24/2028 Common Stock 595,111 ( 3 ) 595,111 Stock Option (right to buy) $ 0.22 12/21/2020 A 595,111 12/21/2020 11/21/2023 Common Stock 595,111 ( 4 ) 595,111 D

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

Explanation of Responses:

( 1 )Mr. Hynes received 6,181,461 shares of XL Hybrids, Inc., a Delaware corporation ("Legacy XL"), in connection with 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 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"). ( 2 )25% of the shares underlying this option vest 12 months from July 1, 2017 and of the 75% remaining, an additional 6.25% shall vest every three months thereafter, subject to Mr. Hynes' continued service through the applicable vesting date. ( 3 )Received in the Merger in exchange for a stock option to acquire 785,948 shares of Legacy XL common stock for $0.18 per share. ( 4 )Received in the Merger in exchange for a stock option to acquire 785,948 shares of Legacy XL common stock for $0.16 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.