15 institutions reported holding $30.7M of Constellation Software (CNSWF) in SEC 13F filings for 2026-06-30. Largest institutional holders: Mn Services Vermogensbeheer B.V. ($11.0M), O'Brien Greene & Co. Inc ($6.4M), APPLETON PARTNERS INC/MA ($6.0M), Bretton Capital Management, LLC ($4.1M), DF DENT & CO INC ($1.1M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Mn Services Vermogensbeheer B.V. | $11.0M | 5,867 | Trimmed |
| 2 | O'Brien Greene & Co. Inc | $6.4M | 3,411 | Added |
| 3 | APPLETON PARTNERS INC/MA | $6.0M | 3,159 | Added |
| 4 | Bretton Capital Management, LLC | $4.1M | 2,100 | New |
| 5 | DF DENT & CO INC | $1.1M | 573 | Hold |
| 6 | ATLAS CAPITAL ADVISORS INC. | $806,176 | 427 | Added |
| 7 | Ancora Advisors LLC | $604,103 | 628 | Trimmed |
| 8 | LOUNTZIS ASSET MANAGEMENT, LLC | $538,365 | 285 | Hold |
| 9 | KELLEHER FINANCIAL ADVISORS | $45,171 | 24 | Added |
| 10 | GAMMA Investing LLC | $32,096 | 95 | Added |
| 11 | ORG Wealth Partners, LLC | $18,821 | 23 | Hold |
| 12 | Sterling Capital Management LLC | $7,552 | 4 | New |
| 13 | PNC Financial Services Group, Inc. | $7,528 | 4 | Hold |
| 14 | BALLAST ADVISORS LLC | $0 | 0 | Exited |
| 15 | Brooklyn FI, LLC | $0 | 180 | New |
Source: SEC Form 13F filings · as of 2026-06-30