Advent International, L.P. - Oct 1, 2025 SCHEDULE 13D Report for Waystar Holding Corp. Common Stock, par value $0.01 per share (WAY)

Filing Manager
ADVENT INTERNATIONAL, L.P.
Reporting Manager
ADVENT INTERNATIONAL, L.P.
Security
Waystar Holding Corp. Common Stock, par value $0.01 per share
Symbol
WAY
Shares outstanding
191M shares
Disclosed Ownership
11.1M shares
Ownership
5.8%
Form type
SCHEDULE 13D
Date filed
10/3/2025, 08:36 PM
Date of event
Oct 1, 2025
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
ADVENT INTERNATIONAL, L.P. 5.8% 11.1M 0 11.1M /s/ Neil Crawford Neil Crawford / Vice President of Finance 0001034196
Advent International GP, LLC 5.8% 11.1M 0 11.1M /s/ Neil Crawford Neil Crawford / Vice President of Finance
AIO Holdings L.P. 5.8% 11.1M 0 11.1M /s/ Neil Crawford Neil Crawford / Treasurer and Secretary