Form 144 - Report of proposed sale of securities:
SEC Accession No. 0000950170-25-113681
Filing Date
2025-09-08
Accepted
2025-09-08 19:15:28
Documents
1

Document Format Files

Seq Description Document Type Size
1 primary_doc.html 144  
1 primary_doc.xml 144 2805
  Complete submission text file 0000950170-25-113681.txt   4427
Mailing Address 125 SUMMER STREET, FLOOR 6 BOSTON MA 02110
Business Address 125 SUMMER STREET, FLOOR 6 BOSTON MA 02110 800-338-1744
Klaviyo, Inc. (Subject) CIK: 0001835830 (see all company filings)

EIN.: 000000000 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 144 | Act: 33 | File No.: 001-41806 | Film No.: 251301305
SIC: 7372 Services-Prepackaged Software
(CF Office: 06 Technology)

Mailing Address 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116
Business Address 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 (617) 824-1000
SUMMIT INVESTORS GE IX/VC IV (UK), L.P. (Reporting) CIK: 0001846709 (see all company filings)

EIN.: 981266222 | State of Incorp.: E9 | Fiscal Year End: 1231
Type: 144