Who actually executed the Celestica (CLS) share sales reported in the Form 4?

The open-market sales were executed by Mionis 2026 GRAT Number Three, a grantor retained annuity trust associated with CEO Robert Mionis. The filing attributes these transactions to that entity as an indirect ownership vehicle.

CEO trust of Celestica (CLS) sells 18,176 shares under 10b5-1 plan

Q: Was the Celestica (CLS) CEO’s share sale made under a Rule 10b5-1 plan?

Yes. The Form 4 states the transactions were effected under a Rule 10b5-1 trading plan adopted by the reporting person on March 11, 2026. Such plans pre-schedule trades, reducing the significance of timing decisions.

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Celestica Inc. reported a Form 4 showing open-market sales of common shares by a trust associated with Chief Executive Officer Robert Mionis. Mionis 2026 GRAT Number Three sold 18,176 common shares on June 17, 2026 at prices between $377.93 and $392.205 per share.

The filing notes these transactions were made under a pre-arranged Rule 10b5-1 trading plan adopted on March 11, 2026. After these transactions, the report shows Mionis with 453,697 common shares held directly and additional indirect holdings of 210,445 and 145,565 common shares in Mionis 2026 GRAT Number One and Number Two, respectively.

Insider Trade Summary 10b5-1

Net Seller: 18,176 shares ($7,000,835)

Net Sell 17 txns

Insider MIONIS ROBERT

Role Chief Executive Officer

Sold 18,176 shs ($7.00M)

Type	Security	Shares	Price	Value
Sale	Common Shares	341	$378.37	$129K
Sale	Common Shares	1,515	$379.50	$575K
Sale	Common Shares	437	$380.25	$166K
Sale	Common Shares	760	$381.45	$290K
Sale	Common Shares	1,520	$382.43	$581K
Sale	Common Shares	1,721	$383.42	$660K
Sale	Common Shares	1,850	$384.36	$711K
Sale	Common Shares	2,440	$385.44	$940K
Sale	Common Shares	1,431	$386.25	$553K
Sale	Common Shares	1,510	$387.27	$585K
Sale	Common Shares	1,560	$388.51	$606K
Sale	Common Shares	2,352	$389.40	$916K
Sale	Common Shares	579	$390.18	$226K
Sale	Common Shares	160	$392.11	$63K
holding	Common Shares	--	--	--
holding	Common Shares	--	--	--
holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 78,219 shares (Indirect, By Mionis 2026 GRAT Number Three); Common Shares — 453,697 shares (Direct, null)

Footnotes (1)

This transaction was effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on March 11, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $377.93-$378.83, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $379.00-$379.92, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $379.98 -$380.55, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $380.97-$381.85, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $381.99-$382.87, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $382.94-$383.91, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $383.93 -$384.89, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $384.94 -$385.90, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $385.96 -$386.83, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $386.94 -$387.64, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $387.98 -$388.92, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $388.96-$389.84, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $389.96-$390.59, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $391.95-$392.205 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

Shares sold: 18,176 shares Sale price range: $377.93–$392.205 per share Direct holdings after: 453,697 shares +3 more

6 metrics

Shares sold 18,176 shares Open-market sales on June 17, 2026

Sale price range $377.93–$392.205 per share Prices across multiple sale tranches

Direct holdings after 453,697 shares Common shares held directly by Robert Mionis

Mionis 2026 GRAT Number One 210,445 shares Indirect common share holdings after transactions

Mionis 2026 GRAT Number Two 145,565 shares Indirect common share holdings after transactions

Sell transactions count 14 transactions Non-derivative open-market sales summarized in Form 4

Key Terms

Rule 10b5-1 plan, weighted average price, Mionis 2026 GRAT Number Three, grantor retained annuity trust (GRAT)

4 terms

Rule 10b5-1 plan financial

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

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.

Mionis 2026 GRAT Number Three financial

"direct_or_indirect: I, nature_of_ownership: By Mionis 2026 GRAT Number Three"

grantor retained annuity trust (GRAT) financial

"nature_of_ownership: By Mionis 2026 GRAT Number One/Two/Three"

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Form 4 Insider Transactions: What Each Field Means →

06/17/2026 - 08:54 PM

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).

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)
06/17/2026

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	06/17/2026		S⁽¹⁾		341	D	$378.37⁽²⁾	78,219	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,515	D	$379.5⁽³⁾	76,704	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		437	D	$380.25⁽⁴⁾	76,267	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		760	D	$381.45⁽⁵⁾	75,507	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,520	D	$382.43⁽⁶⁾	73,987	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,721	D	$383.42⁽⁷⁾	72,266	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,850	D	$384.36⁽⁸⁾	70,416	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		2,440	D	$385.44⁽⁹⁾	67,976	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,431	D	$386.25⁽¹⁰⁾	66,545	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,510	D	$387.27⁽¹¹⁾	65,035	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		1,560	D	$388.51⁽¹²⁾	63,475	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		2,352	D	$389.4⁽¹³⁾	61,123	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		579	D	$390.18⁽¹⁴⁾	60,544	I	By Mionis 2026 GRAT Number Three
Common Shares	06/17/2026		S⁽¹⁾		160	D	$392.11⁽¹⁵⁾	60,384	I	By Mionis 2026 GRAT Number Three
Common Shares								453,697	D
Common Shares								210,445	I	By Mionis 2026 GRAT Number One
Common Shares								145,565	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 $377.93-$378.83, 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 $379.00-$379.92, 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 $379.98 -$380.55, 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 $380.97-$381.85, 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 $381.99-$382.87, 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 $382.94-$383.91, 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 $383.93 -$384.89, 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 $384.94 -$385.90, 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 $385.96 -$386.83, 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 $386.94 -$387.64, 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 $387.98 -$388.92, 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 $388.96-$389.84, 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.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $389.96-$390.59, 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 $391.95-$392.205 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	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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Celestica (CLS) report for CEO Robert Mionis?

Celestica reported that a trust associated with CEO Robert Mionis sold 18,176 common shares. The sales were executed on June 17, 2026, as open-market transactions at various prices, according to a Form 4 insider trading report.

At what prices were the Celestica (CLS) shares sold in the latest Form 4?

The 18,176 Celestica common shares were sold at prices between $377.93 and $392.205 per share. The filing reports weighted average prices, with detailed trade breakdowns available to regulators, the issuer, or shareholders on request.

How many Celestica (CLS) shares does Robert Mionis hold directly after the reported trades?

After the reported transactions, Robert Mionis holds 453,697 Celestica common shares directly. This direct position is in addition to sizable indirect holdings through the Mionis 2026 GRAT Number One and Number Two trusts.

What indirect Celestica (CLS) shareholdings are reported for the CEO in the Form 4?

The Form 4 shows indirect ownership of 210,445 Celestica common shares through Mionis 2026 GRAT Number One and 145,565 shares through Mionis 2026 GRAT Number Two. Additional activity occurred in Mionis 2026 GRAT Number Three, which sold shares.