Robert Mionis - 13 Aug 2026 Form 4 Insider Report for CELESTICA INC (CLS)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: CLS
Reported as of: 13 Aug 2026
Net transaction value: -$8,514,644
SEC form: 4
Accepted by SEC: 14 Aug 2026, 16:12:34 UTC
Prior SEC filing: 12 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 14 Aug 2026.

Key facts

This page summarizes Robert Mionis's Form 4 filing for CELESTICA INC (CLS).
6 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 14 Aug 2026, 16:12.

Change

Previous filing in this sequence was filed on 12 Aug 2026.
Current net transaction value: -$8,514,644.

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: 14 Aug 2026

Reported non-derivative transactions

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

CLS transaction

Common Shares

Sale

Transaction value: $2,001,495
Shares: -5,554
Change %: -12%
Price: $360.37
Shares after: 41,338
Date: 13 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F2

CLS transaction

Common Shares

Sale

Transaction value: $1,785,875
Shares: -4,941
Change %: -12%
Price: $361.44
Shares after: 36,397
Date: 13 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F3

CLS transaction

Common Shares

Sale

Transaction value: $1,247,275
Shares: -3,440
Change %: -9.5%
Price: $362.58
Shares after: 32,957
Date: 13 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F4

CLS transaction

Common Shares

Sale

Transaction value: $1,915,750
Shares: -5,270
Change %: -16%
Price: $363.52
Shares after: 27,687
Date: 13 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F5

CLS transaction

Common Shares

Sale

Transaction value: $1,468,895
Shares: -4,030
Change %: -15%
Price: $364.49
Shares after: 23,657
Date: 13 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F6

CLS transaction

Common Shares

Sale

Transaction value: $95,354
Shares: -261
Change %: -1.1%
Price: $365.34
Shares after: 23,396
Date: 13 Aug 2026
Ownership: By Mionis 2026 GRAT Number Two
Footnotes: F1, F7

CLS holding

Common Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 453,697
Date: 13 Aug 2026
Ownership: Direct

CLS holding

Common Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 210,445
Date: 13 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 7 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-$360.99, 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 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-$362.01, 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 $362.11-$363.01, 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 $363.12-$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.

Footnote F6

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $364.13-$365.06, 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 $365.30-$365.39, 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.