Significant Ownership of SUMMIT PARTNERS L P
- Large-stake filing summary
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- Recent SEC Schedule 13D/G filings for SUMMIT PARTNERS L P focus on large-stake beneficial ownership disclosures and amendments.
- Use this view to spot new large holders, amended positions, and activist-style ownership evidence.
- Manager location
- Boston, MA
- Manager signature
- By: Summit Master Company, LLC / /s/ Adam H. Hennessey, as POA - Its: General Partner / Adam H. Hennessey, as Power of Attorney
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Manager
Names, identifiers, and filing context for this profile.
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Significant Ownership of SUMMIT PARTNERS L P
| Sym | Company | Class | Ownership | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|---|
| KVYO | Klaviyo, Inc. | Series A Common Stock, par value $0.001 per share | 12% | $522,033,423 | -$331,587,750 | 18,852,778 | -39% | Summit Partners, L.P. | 30 Sep 2025 |
| LFST | LifeStance Health Group, Inc. | Common Stock, par value $0.01 per share | 7.5% | $186,066,273 | -$27,486,161 | 29,209,776 | -13% | Summit Partners, L.P. | 31 Mar 2026 |
Schedules 13D/G Reported by SUMMIT PARTNERS L P:
| Sym | Target | Class | Ownership | Change | Current shares | Change | Value | Reporting name | Form | Report period | Filing date |
|---|
Schedule rows are parsed from SEC 13D/G filings. Open the linked filing or target page to verify the reported ownership and shares.