Upgrade to SI Premium - Free Trial

Form SCHEDULE 13G/A LifeStance Health Group, Filed by: SUMMIT PARTNERS L P

August 11, 2026 4:15 PM





Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)




schemaVersion:


SCHEDULE 13G




Comment for Type of Reporting Person: *Calculated based on 382,055,609 shares of common stock, par value $0.01 per share ("Common Stock") outstanding as of July 29, 2026, as reported on the Issuer's Form 10-Q, filed with the Securities and Exchange Commission ("SEC") on August 6, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: *Calculated based on 382,055,609 shares of Common Stock outstanding as of July 29, 2026, as reported on the Issuer's Form 10-Q, filed with the SEC on August 6, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: *Calculated based on 382,055,609 shares of Common Stock outstanding as of July 29, 2026, as reported on the Issuer's Form 10-Q, filed with the SEC on August 6, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: *Calculated based on 382,055,609 shares of Common Stock outstanding as of July 29, 2026, as reported on the Issuer's Form 10-Q, filed with the SEC on August 6, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: *Calculated based on 382,055,609 shares of Common Stock outstanding as of July 29, 2026, as reported on the Issuer's Form 10-Q, filed with the SEC on August 6, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: *Calculated based on 382,055,609 shares of Common Stock outstanding as of July 29, 2026, as reported on the Issuer's Form 10-Q, filed with the SEC on August 6, 2026.


SCHEDULE 13G



Summit Partners, L.P.
Signature:By: Summit Master Company, LLC / /s/ Adam H. Hennessey, as Member
Name/Title:Its: General Partner / Adam H. Hennessey, as Power of Attorney
Date:08/11/2026
Summit Partners Growth Equity Fund IX-A, L.P.
Signature:By: Summit Partners GE IX, L.P. / /s/ Adam H. Hennessey, as POA
Name/Title:Its: General Partner / Adam H. Hennessey, as Power of Attorney
Date:08/11/2026
Summit Partners Growth Equity Fund IX-B, L.P.
Signature:By: Summit Partners GE IX, L.P. / /s/ Adam H. Hennessey, as POA
Name/Title:Its: General Partner / Adam H. Hennessey, as Power of Attorney
Date:08/11/2026
Summit Investors GE IX/VC IV (UK), L.P.
Signature:By: Summit Investors Management, LLC / /s/ Adam H. Hennessey, as POA
Name/Title:Its: Manager / Adam H. Hennessey, as Power of Attorney
Date:08/11/2026
Summit Partners Entrepreneur Advisors Fund II, L.P.
Signature:By: Summit Partners Entrepreneur Advisors GP II, LLC / /s/ Adam H. Hennessey, as POA
Name/Title:Its: General Partner / Adam H. Hennessey, as Power of Attorney
Date:08/11/2026
Summit Investors GE IX/VC IV, LLC
Signature:By: Summit Investors Management, LLC / /s/ Adam H. Hennessey, as POA
Name/Title:Its: Manager / Adam H. Hennessey, as Power of Attorney
Date:08/11/2026
Exhibit Information

Exhibit A: Joint Filing Agreement, dated as of February 4, 2022, incorporated herein by reference to the statement on Schedule 13G filed by the Reporting Persons on February 4, 2022. Exhibit B: Powers of Attorney, dated as of October 25, 2021, incorporated herein by reference to the statement on Schedule 13G filed by the Reporting Persons on February 4, 2022.

Categories

SEC Filings