Robert Mionis - 04 Aug 2026 Form 4 Insider Report for CELESTICA INC (CLS)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: CLS
Reported as of: 04 Aug 2026
Net transaction value: -$36,328,092
SEC form: 4
Accepted by SEC: 06 Aug 2026, 20:19:47 UTC
Prior SEC filing: 03 Aug 2026
Next SEC filing: 06 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Tracy Connelly McGilley, attorney-in-fact

Key filing fact

Robert Mionis filed Form 4 for CELESTICA INC (CLS) on 06 Aug 2026.

Key facts

This page summarizes Robert Mionis's Form 4 filing for CELESTICA INC (CLS).
20 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 06 Aug 2026, 20:19.

Change

Previous filing in this sequence was filed on 03 Aug 2026.
Current net transaction value: -$36,328,092.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001195655 Primary reporting owner

MIONIS ROBERT

Relationship: Chief Executive Officer, Director
Address: 5140 YONGE STREET, SUITE 1900, TORONTO, ONTARIO, CANADA
Signature: /s/ Tracy Connelly McGilley, attorney-in-fact
Signature date: 06 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CLS transaction

Common Shares

Sale

Transaction value: $3,445,718
Shares: -9,564
Change %: -19%
Price: $360.28
Shares after: 41,277
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F2

CLS transaction

Common Shares

Sale

Transaction value: $481,183
Shares: -1,331
Change %: -3.2%
Price: $361.52
Shares after: 39,946
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F3

CLS transaction

Common Shares

Sale

Transaction value: $686,653
Shares: -1,895
Change %: -4.7%
Price: $362.35
Shares after: 38,051
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F4

CLS transaction

Common Shares

Sale

Transaction value: $2,140,337
Shares: -5,887
Change %: -15%
Price: $363.57
Shares after: 32,164
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F5

CLS transaction

Common Shares

Sale

Transaction value: $707,285
Shares: -1,940
Change %: -6%
Price: $364.58
Shares after: 30,224
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F6

CLS transaction

Common Shares

Sale

Transaction value: $708,763
Shares: -1,939
Change %: -6.4%
Price: $365.53
Shares after: 28,285
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F7

CLS transaction

Common Shares

Sale

Transaction value: $1,926,747
Shares: -5,254
Change %: -19%
Price: $366.72
Shares after: 23,031
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F8

CLS transaction

Common Shares

Sale

Transaction value: $2,069,446
Shares: -5,629
Change %: -24%
Price: $367.64
Shares after: 17,402
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F9

CLS transaction

Common Shares

Sale

Transaction value: $2,152,993
Shares: -5,841
Change %: -34%
Price: $368.60
Shares after: 11,561
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F10

CLS transaction

Common Shares

Sale

Transaction value: $1,300,710
Shares: -3,522
Change %: -30%
Price: $369.31
Shares after: 8,039
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F11

CLS transaction

Common Shares

Sale

Transaction value: $165,555
Shares: -447
Change %: -5.6%
Price: $370.37
Shares after: 7,592
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F12

CLS transaction

Common Shares

Sale

Transaction value: $892,380
Shares: -2,401
Change %: -32%
Price: $371.67
Shares after: 5,191
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F13

CLS transaction

Common Shares

Sale

Transaction value: $1,484,466
Shares: -3,986
Change %: -77%
Price: $372.42
Shares after: 1,205
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F14

CLS transaction

Common Shares

Sale

Transaction value: $449,875
Shares: -1,205
Change %: -100%
Price: $373.34
Shares after: 0
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Three
Footnotes: F1, F15

CLS transaction

Common Shares

Sale

Transaction value: $618,858
Shares: -1,717
Change %: -1.2%
Price: $360.43
Shares after: 143,848
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F16

CLS transaction

Common Shares

Sale

Transaction value: $380,105
Shares: -1,051
Change %: -0.73%
Price: $361.66
Shares after: 142,797
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F17

CLS transaction

Common Shares

Sale

Transaction value: $2,149,880
Shares: -5,785
Change %: -4.1%
Price: $371.63
Shares after: 137,012
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F18

CLS transaction

Common Shares

Sale

Transaction value: $8,334,240
Shares: -22,375
Change %: -16%
Price: $372.48
Shares after: 114,637
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F19

CLS transaction

Common Shares

Sale

Transaction value: $4,903,509
Shares: -13,131
Change %: -11%
Price: $373.43
Shares after: 101,506
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F20

CLS transaction

Common Shares

Sale

Transaction value: $1,329,390
Shares: -3,553
Change %: -3.5%
Price: $374.16
Shares after: 97,953
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F21

CLS holding

Common Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 453,697
Date: 04 Aug 2026
Ownership: Direct

CLS holding

Common Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 210,445
Date: 04 Aug 2026
Ownership: By Mionis 2026 GRAT Number One

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 21 footnotes

Footnote F1

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

Footnote 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-$360.96, 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.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $361.03-$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.

Footnote 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-$362.77, 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.

Footnote F5

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $363.03-$363.99, 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.

Footnote F6

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $364.11-$364.99, 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.

Footnote F7

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $365.24-$365.87, 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.

Footnote F8

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $366.01-$366.99, 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.

Footnote F9

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $367.00-$367.99, 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.

Footnote F10

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $368.00-$368.99, 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.

Footnote F11

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $369.00-$369.81, 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.

Footnote F12

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $370.10-$370.77, 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.

Footnote F13

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $371.13-$371.97, 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.

Footnote F14

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $372.06-372.95, 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.

Footnote F15

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $373.07-$373.88, 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.

Footnote F16

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $360.00-$360.65, 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.

Footnote F17

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $361.18-$361.92, 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.

Footnote F18

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $371.04-$371.99, 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.

Footnote F19

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $372.00-$372.99, 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.

Footnote F20

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $373.00-$373.98, 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.

Footnote F21

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $374.00-$374.43, 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.