Power of Attorney for Sarah Personette at LifeStance Health Group, Inc.

Sarah Personette, a director of LifeStance Health Group, Inc., has appointed David Bourdon, Ryan McGroarty, and Ryan Pardo as her attorneys-in-fact. This power of attorney allows them to prepare, execute, and submit various SEC forms on her behalf, including Forms 3, 4, 5, and Schedules 13D or 13G. The attorneys-in-fact are also authorized to obtain codes and passwords for electronic filings with the SEC. This power of attorney remains in effect until Personette is no longer required to file these forms or until she revokes it in writing. The document was executed on September 2, 2025.