Celestica CEO's trust sells 23,396 shares

The transactions by Mionis 2026 GRAT Number Two were made under a Rule 10b5-1 plan adopted by the chief executive officer on March 11, 2026.

Available on EDGAR 09/24/2026 - 05:34 PM EDT Accepted by SEC EDGAR 09/24/2026 - 05:33 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Celestica Inc. (CLS) CEO and director Robert Mionis reported sales by Mionis 2026 GRAT Number Two totaling 23,396 common shares in eight transactions on September 23, 2026. The sales were made under a Rule 10b5-1 plan adopted by Robert Mionis on March 11, 2026. Reported weighted-average prices included $360.36 per share for a 1,920-share sale and $367.34 per share for a 288-share sale. The filing lists 453,697 common shares held directly and 210,445 common shares held by Mionis 2026 GRAT Number One.

Insider Trade Summary 10b5-1

Net Seller: 23,396 shares

Net Sell 8 txns

Insider MIONIS ROBERT

Role Chief Executive Officer

Sold 23,396 shs ($8.52M)

Share of Position Sold 100%

Type	Security	Shares	Price	Value
Sale	Common Shares F1, F2	1,920	$360.36	$692K
Sale	Common Shares F1, F3	2,294	$361.22	$829K
Sale	Common Shares F1, F4	2,480	$362.48	$899K
Sale	Common Shares F1, F5	2,590	$363.46	$941K
Sale	Common Shares F1, F6	3,403	$364.67	$1.24M
Sale	Common Shares F1, F7	6,749	$365.69	$2.47M
Sale	Common Shares F1, F8	3,672	$366.44	$1.35M
Sale	Common Shares F1, F9	288	$367.34	$106K
Holding	Common Shares	--	--	--
Holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 0 shares (Indirect, By Mionis 2026 GRAT Number Two); Common Shares — 453,697 shares (Direct); Common Shares — 210,445 shares (Indirect, By Mionis 2026 GRAT Number One)

Holdings Before and After: Common Shares, 23,396 to 0 shares (Indirect, By Mionis 2026 GRAT Number Two)

Other Insiders: 1 other insider reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (9)

1. F1. This transaction was effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on March 11, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $360.00-$360.99, 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. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $361.00-$361.99, 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.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $362.00-$362.84, 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. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $363.12-$364.11, 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. F6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $364.12-$365.07, 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. F7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $365.13-$366.10, 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. F8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $366.13-$367.00, 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.
9. F9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $367.24-$367.45, 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.

Key Figures

Common shares sold: 23,396 shares Sale transactions: 8 transactions Weighted-average sale price: $360.36 per share +3 more

6 metrics

Common shares sold 23,396 shares Eight transactions by Mionis 2026 GRAT Number Two on September 23, 2026

Sale transactions 8 transactions Reported for September 23, 2026

Weighted-average sale price $360.36 per share For a 1,920-share sale on September 23, 2026

Weighted-average sale price $367.34 per share For a 288-share sale on September 23, 2026

Direct common shares held 453,697 shares Listed on September 23, 2026

Common shares held by Mionis 2026 GRAT Number One 210,445 shares Listed on September 23, 2026

Key Terms

Rule 10b5-1 plan, weighted average price, GRAT

3 terms

Rule 10b5-1 plan regulatory

"effected pursuant to a Rule 10b5-1 plan"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

GRAT financial

"By Mionis 2026 GRAT Number Two"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many CLS shares did Mionis 2026 GRAT Number Two sell?

Mionis 2026 GRAT Number Two sold 23,396 Celestica common shares across eight reported transactions on September 23, 2026. Robert Mionis is identified as Celestica's chief executive officer and a director. The transactions were made under a Rule 10b5-1 plan he adopted on March 11, 2026.

What prices were reported for the CLS share sales?

The reported weighted-average prices included $360.36 per share for a 1,920-share sale and $367.34 per share for a 288-share sale. Both transactions were reported for September 23, 2026, and the prices were weighted averages for shares sold in multiple transactions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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SEC 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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

X

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 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)
09/23/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Shares	09/23/2026		S(1)		1,920	D	$360.36(2)	21,476	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		2,294	D	$361.22(3)	19,182	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		2,480	D	$362.48(4)	16,702	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		2,590	D	$363.46(5)	14,112	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		3,403	D	$364.67(6)	10,709	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		6,749	D	$365.69(7)	3,960	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		3,672	D	$366.44(8)	288	I	By Mionis 2026 GRAT Number Two
Common Shares	09/23/2026		S(1)		288	D	$367.34(9)	0	I	By Mionis 2026 GRAT Number Two
Common Shares								453,697	D
Common Shares								210,445	I	By Mionis 2026 GRAT Number One

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

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 $360.00-$360.99, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $361.00-$361.99, 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $362.00-$362.84, 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 $363.12-$364.11, 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 $364.12-$365.07, 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 $365.13-$366.10, 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 $366.13-$367.00, 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.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $367.24-$367.45, 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.

	/s/ Tracy Connelly McGilley, attorney-in-fact	09/24/2026
	** 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)