SUMMIT PARTNERS L P - 18 Aug 2025 Form 4 Insider Report for LifeStance Health Group, Inc. (LFST)

Reporting relationship: 10%+ Owner
Issuer ticker: LFST
Reported as of: 18 Aug 2025
Net transaction value: -$42,626,750
SEC form: 4
Accepted by SEC: 20 Aug 2025, 16:34:29 UTC
Prior SEC filing: 15 Aug 2025
Next SEC filing: 22 Aug 2025
Source filing: View source filing
Reporting owner signature: Summit Partners Growth Equity Fund IX-A, L.P., by Summit Partners GE IX, L.P., its GP, by Summit Partners GE IX, LLC, its GP, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its GP, by /s/ Adam...

Open signature details

Summit Partners Growth Equity Fund IX-A, L.P., by Summit Partners GE IX, L.P., its GP, by Summit Partners GE IX, LLC, its GP, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its GP, by /s/ Adam Hennessey, Member

Key filing fact

SUMMIT PARTNERS L P filed Form 4 for LifeStance Health Group, Inc. (LFST) on 20 Aug 2025.

Key facts

This page summarizes SUMMIT PARTNERS L P's Form 4 filing for LifeStance Health Group, Inc. (LFST).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 20 Aug 2025, 16:34.

Change

Previous filing in this sequence was filed on 15 Aug 2025.
Current net transaction value: -$42,626,750.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (6)

CIK 0000830588 Primary reporting owner

SUMMIT PARTNERS L P

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: Summit Partners Growth Equity Fund IX-A, L.P., by Summit Partners GE IX, L.P., its GP, by Summit Partners GE IX, LLC, its GP, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its GP, by /s/ Adam Hennessey, Member
Signature date: 20 Aug 2025

CIK 0001634415

Summit Partners Growth Equity Fund IX-A, L.P.

Relationship: shareholder
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: Summit Partners Growth Equity Fund IX-B, L.P., by Summit Partners GE IX, L.P., its GP, by Summit Partners GE IX, LLC, its GP, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its GP, by /s/ Adam Hennessey, Member
Signature date: 20 Aug 2025

CIK 0001634426

Summit Partners Growth Equity Fund IX-B, L.P.

Relationship: shareholder
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: Summit Investors GE IX/VC IV (UK), L.P., by Summit Investors Management, LLC, its General Partner, by Summit Master Company, LLC, its Managing Member, by /s/ Adam Hennessey, Member
Signature date: 20 Aug 2025

CIK 0001654074

SUMMIT INVESTORS GE IX/VC IV, LLC

Relationship: owner
Address: 222 BERKELEY ST, 18TH FLOOR, BOSTON
Signature: Summit Partners Entrepreneur Advisors Fund II, L.P., by Summit Partners Entrepreneur Advisors GP II, LLC, its General Partner, by /s/ Adam Hennessey, Member
Signature date: 20 Aug 2025

CIK 0001846709

SUMMIT INVESTORS GE IX/VC IV (UK), L.P.

Relationship: Owner
Address: 222 BERKELEY ST, 18TH FLOOR, BOSTON
Signature: Summit Investors GE IX/VC IV, LLC, by Summit Investors Management, LLC, its Manager, by Summit Master Company, LLC, its Managing Member, by /s/ Adam Hennessey, Member
Signature date: 20 Aug 2025

CIK 0001660981

Summit Partners Entrepreneur Advisors Fund II, L.P.

Relationship: Owner
Address: 222 BERKELEY ST, 18TH FLOOR, BOSTON
Signature: Summit Partners Growth Equity Fund IX-A, L.P., by Summit Partners GE IX, L.P., its GP, by Summit Partners GE IX, LLC, its GP, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its GP, by /s/ Adam Hennessey, Member
Signature date: 20 Aug 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

LFST transaction

Common Stock

Sale

Transaction value: $42,626,750
Shares: -8,407,643
Change %: -20%
Price: $5.07
Shares after: 33,524,715
Date: 18 Aug 2025
Ownership: Direct
Footnotes: F1, F2, F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

SUMMIT PARTNERS L P is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 4 footnotes

Footnote F1

Represents 5,148,494 shares sold by Summit Partners Growth Equity Fund IX-A, L.P., 3,214,648 shares sold by Summit Partners Growth Equity Fund IX-B, L.P., 35,938 shares sold by Summit Investors GE IX/VC IV, LLC, 4,804 shares sold by Summit Partners Entrepreneur Advisors Fund II, L.P. and 3,759 shares sold by Summit Investors GE IX/VC IV (UK), L.P.

Footnote F2

The reported securities are held as follows: 20,529,149 shares in the name of Summit Partners Growth Equity Fund IX-A, L.P.; 12,818,117 shares in the name of Summit Partners Growth Equity Fund IX-B, L.P.; 143,301 shares in the name of Summit Investors GE IX/VC IV, LLC; 19,157 shares in the name of Summit Partners Entrepreneur Advisors Fund II, L.P.; and 14,991 shares in the name of Summit Investors GE IX/ VC IV (UK), L.P.

Footnote F3

Summit Partners, L.P. is the managing member of Summit Partners GE IX, LLC, which is general partner of Summit Partners GE IX, L.P., which is the general partner of Summit Partners Growth Equity Fund IX-A, L.P. and Summit Partners Growth Equity Fund IX-B, L.P. Summit Master Company, LLC is (i) the sole member of Summit Partners Entrepreneur Advisors GP II, LLC, which is the general partner of Summit Partners Entrepreneur Advisors Fund II, L.P. and (ii) the general partner of Summit Partners L.P., which is the manager of Summit Investors Management, LLC, which is the manager of Summit Investors GE IX/VC IV, LLC, and the general partner of Summit Investors GE IX/VC IV (UK), L.P.

Footnote F4

Summit Master Company, LLC, as the sole member of Summit Partners Entrepreneur Advisors GP II, LLC and the managing member of Summit Investors Management, LLC, has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its investment committee responsible for voting and investment decisions with respect to LifeStance Health Group, Inc. Summit Partners, L.P., through a four-person investment committee, currently composed of Peter Y. Chung, Mark A. deLaar, Darren M. Black and Craig D. Frances, has voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares. Each of the Summit Funds, Mr. Chung, Mr. deLaar, Mr. Black and Dr. Frances disclaim beneficial ownership of the shares, except, in each case, to the extent of such person's or entity's pecuniary interest therein.