SEC FORM 4

SEC FORM 4SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MIONIS ROBERT

(Last)

(First)

(Middle)

5140 YONGE STREET

SUITE 1900

(Street)

TORONTO

ONTARIO, CANADA

M2N 6L7

(City)

(State)

(Zip)

ONTARIO, CANADA

(Country)

2. Issuer Name and Ticker or Trading Symbol
CELESTICA INC [ CLS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Shares	06/15/2026		S⁽¹⁾		1,420	D	$394.58⁽²⁾	198,964⁽³⁾	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		2,983	D	$395.92⁽⁴⁾	195,981	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		2,668	D	$396.83⁽⁵⁾	193,313	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		10,350	D	$397.92⁽⁶⁾	182,963	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		11,245	D	$398.86⁽⁷⁾	171,718	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		10,730	D	$399.68⁽⁸⁾	160,988	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		6,374	D	$400.87⁽⁹⁾	154,614	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		11,118	D	$401.94⁽¹⁰⁾	143,496	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		6,786	D	$402.77⁽¹¹⁾	136,710	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		280	D	$403.75⁽¹²⁾	136,430	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		444	D	$406.46⁽¹³⁾	135,986	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		160	D	$407.48⁽¹⁴⁾	135,826	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		80	D	$409.26	135,746	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		80	D	$410.22	135,666	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		80	D	$412.01	135,586	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		1,178	D	$412.94⁽¹⁵⁾	134,408	I	By Mionis 2026 GRAT Number Three
Common Shares	06/15/2026		S⁽¹⁾		80	D	$413.68	134,328	I	By Mionis 2026 GRAT Number Three
Common Shares								453,697⁽³⁾⁽¹⁶⁾⁽¹⁷⁾	D
Common Shares								210,445⁽¹⁶⁾	I	By Mionis 2026 GRAT Number One
Common Shares								145,565⁽¹⁷⁾	I	By Mionis 2026 GRAT Number Two

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on March 11, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $394.31-$395.30, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

3. On March 10, 2026, the Reporting Person contributed 200,384 shares of the Issuer's common shares to Mionis 2026 GRAT Number Three, which contribution was exempt from Section 16 pursuant to Rule 16a-13 under the Exchange Act.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $395.32-$396.25, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $396.40-$397.29, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $397.46-$398.30, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $398.31-$399.30, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $399.31-$400.215, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $400.34-$401.30, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $401.38-$402.29, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $402.31-$403.30, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $403.45-$404.00, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $406.345-$406.755, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $407.44-$407.51, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

15. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $412.33-$413.26, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

16. On February 6, 2026, the Reporting Person contributed 210,445 shares of the Issuer's common shares to Mionis 2026 GRAT Number One, which contribution was exempt from Section 16 pursuant to Rule 16a-13 under the Exchange Act.

17. On February 19, 2026, the Reporting Person contributed 145,565 shares of the Issuer's common shares to Mionis 2026 GRAT Number Two, which contribution was exempt from Section 16 pursuant to Rule 16a-13 under the Exchange Act.

	/s/ Tracy Connelly McGilley, attorney-in-fact	06/17/2026
	** Signature of Reporting Person	Date
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.
* Form 4: SEC 1474 (03-26)

Chief Executive Officer Mionis Robert sold $26,426,178 worth of shares (66,056 units at $400.06) as part of a pre-agreed trading plan (SEC Form 4)