SCHEDULE 13G/A

Onestream Inc

Onestream Ord Shs Class A · CUSIP: 68278B107

Event date: 2025-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Kayne Anderson Rudnick Investment Management, LLC

  Shares: 6,211,980.00 · Class: 7.0%

• Virtus Investment Advisers, LLC

  Shares: 4,240,709.00 · Class: 4.8%

• Virtus Equity Trust on behalf of Virtus Small-Cap Growth Fund

  Shares: 4,101,675.00 · Class: 4.7%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.