Bialecki Andrew

Insider Reports History

Location
Boston, MA
Signature
/s/ Landon Edmond, Attorney-in-Fact
All insider transactions
Transactions in reports broken out by “transaction date” reported in original SEC filing, see here for transactions aggregated across transaction date

Holdings reported by Bialecki Andrew:

Form 4 holding Co-Chief Executive Officer, Director, 10%+ Owner

Klaviyo, Inc.

Security class
Series B Common Stock
Shares / value
66,944,118
Estimated value
$1,310,516,536
Report date
19 May 2026
Price
$19.46
Ownership
Direct
Underlying class
Series A Common Stock
Underlying amount
67,344,118
Form 4 holding Co-Chief Executive Officer, Director, 10%+ Owner

Klaviyo, Inc.

Security class
Series B Common Stock
Shares / value
7,517,410
Estimated value
$146,288,798
Report date
19 May 2026
Price
$19.46
Ownership
By The Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023
Underlying class
Series A Common Stock
Underlying amount
7,517,410
Form 4 holding Co-Chief Executive Officer, Director, 10%+ Owner

Klaviyo, Inc.

Security class
Series B Common Stock
Shares / value
517,006
Estimated value
$10,060,936
Report date
19 May 2026
Price
$19.46
Ownership
By The Andrew P. Bialecki Irrevocable GST Trust of 2023
Underlying class
Series A Common Stock
Underlying amount
517,006
Form 4 holding Co-Chief Executive Officer, Director, 10%+ Owner

Klaviyo, Inc.

Security class
Series B Common Stock
Shares / value
517,006
Estimated value
$10,060,936
Report date
19 May 2026
Price
$19.46
Ownership
By The Elizabeth L. Bialecki Irrevocable GST Trust of 2023
Underlying class
Series A Common Stock
Underlying amount
517,006
Form 4 holding Co-Chief Executive Officer, Director, 10%+ Owner

Klaviyo, Inc.

Security class
Series B Common Stock
Shares / value
43,218
Estimated value
$841,022
Report date
19 May 2026
Price
$19.46
Ownership
By spouse
Underlying class
Series A Common Stock
Underlying amount
43,218
Form 4 holding Co-Chief Executive Officer, Director, 10%+ Owner

Klaviyo, Inc.

Security class
Stock Option (Right to Buy)
Shares / value
0
Estimated value
Report date
14 May 2025
Price
Ownership
Direct
Underlying class
Series B Common Stock
Underlying amount

Insider Reports Filed by Bialecki Andrew

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