Insider Trading & Ownership of SUMMIT PARTNERS L P

Location
Boston, MA
Summary
The estimated value of insider holdings of SUMMIT PARTNERS L P is at least $811M dollars as of 10 Sep 2025. SUMMIT PARTNERS L P is the 10%+ Owner of EngageSmart, Inc. and owns shares of EngageSmart, Inc. stock worth about $573M. SUMMIT PARTNERS L P is the 10%+ Owner of LifeStance Health Group, Inc. and owns shares of LifeStance Health Group, Inc. (LFST) stock worth about $170M. SUMMIT PARTNERS L P is the 10%+ Owner of A10 Networks, Inc. and owns shares of A10 Networks, Inc. (ATEN) stock worth about $68.5M. SUMMIT PARTNERS L P is the 10%+ Owner of Klaviyo, Inc. and owns shares of Klaviyo, Inc. (KVYO) stock worth about $388K.
Signature
/s/ Adam Hennessey, as attorney-in-fact for Summit Partners, L.P.
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Ownership of SUMMIT PARTNERS L P

Symbol Company Relationship Holdings Value Past Year Net Change Change % Report Period
ESMT EngageSmart, Inc. 10%+ Owner $573M 07 Mar 2023
LFST LifeStance Health Group, Inc. 10%+ Owner $170M -$42.6M -20.1% 18 Aug 2025
ATEN A10 Networks, Inc. 10%+ Owner $68.5M 08 Sep 2022
KVYO Klaviyo, Inc. 10%+ Owner $388K -$682M -99.9% 08 Sep 2025
DTCB Solo Brands, Inc. 10%+ Owner 28 Oct 2021

Insider Transactions Reported by SUMMIT PARTNERS L P:

Sym Company Class Transaction % Value $ * Price $ Shares Shares After Date Ownership
* An asterisk sign (*) next to the price indicates that the price is likely invalid.