Sec Form 3 Filing - ONEX CORP @ POWERSCHOOL HOLDINGS, INC. - 2021-07-28

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

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 ONEX CORP 2. Issuer Name and Ticker or Trading Symbol POWERSCHOOL HOLDINGS, INC. [ PWSC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 161 BAY STREET, SUITE 4900 3. Date of Earliest Transaction (MM/DD/YY) 07/28/2021 (Street) TORONTO, A6M5J 2S1 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 Class A Common Stock 75,413,862 I See footnotes ( 1 ) ( 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 ONEX CORP 161 BAY ST REET, SUITE 4900 TORONTO, A6M5J 2S1 X X Onex Partners IV GP LLC 165 W CENTER STREET, SUITE 401 MARION, A643302 X X Onex Partners IV Select LP 712 FIFTH AVENUE, 40TH FLOOR NEW YORK, NY10019 X X Onex Private Equity Holdings LLC 165 W CENTER STREET, SUITE 401 MARION, OH43302 X X Onex US Principals LP 165 W CENTER STREET, SUITE 401 MARION, OH43302 X X Signatures Onex Private Equity Holdings LLC By: /s/ Matthew Ross, Director 07/28/2021 Signature of Reporting Person Date Onex US Principals LP By: Onex American Holdings GP LLC, its general partner By: /s/ Matthew Ross, Director 07/28/2021 Signature of Reporting Person Date Gerald W. Schwartz By: /s/ Andrea E. Daly, attorney-in-fact for Gerald W. Schwartz 07/28/2021 Signature of Reporting Person Date Onex Partners IV GP LLC By: /s/ Matthew Ross, Director 07/28/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Reflects 9,510,223, 271,840, 900,522, 39,248,504, 1,364,335, 1,940,327 and 22,178,111 Class A Shares held directly by Pinnacle Holdings I L.P. ("Pinnacle"), Onex Partners IV Select LP ("Partners IV Select"), Onex US Principals LP ("US Principals"), Onex Partners IV LP ("IV LP"), Onex Partners IV GP LP ("IV GP LP"), Onex Partners IV PV LP ("IV PV LP") and Onex Powerschool LP ("Onex Powerschool"), respectively. Onex Corporation, a corporation whose subordinated voting shares are traded on the Toronto Stock Exchange, and/or Mr. Gerald W. Schwartz, may be deemed to beneficially own the shares of Class A common stock held directly by Partners IV Select, US Principals, IV LP, IV GP LP, IV PV LP, Onex Powerschool and Pinnacle , through Onex Corporation's ownership of all of the equity of Onex Partners Canadian GP Inc., ( 2 )(Continued from Footnote 1) which owns all of the equity of (i) Onex Partners IV GP LLC, the general partner of Partners IV Select, and (ii) Onex Partners IV GP Limited, the general partner of IV GP LP, the general partner of IV LP, and IV PV LP, which hold interests in Pinnacle; and through Onex Corporation's ownership of all of the equity of Onex Private Equity Holdings LLC, which owns all of the equity of Onex American Holdings GP LLC, the general partner of Onex Powerschool LP and US Principals. Mr.Gerald W. Schwartz, the Chairman, Chief Executive Officer of Onex Corporation, indirectly owns shares representing a majority of the voting rights of the shares of Onex Corporation, and as such may be deemed to beneficially own all of the shares of Class A common stock beneficially owned by Onex Corporation. Mr. Schwartz disclaims such beneficial ownership.

Remarks: Exhibit 24 - Power of AttorneyForm 2 of 2.

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.