Key facts
- This page summarizes Darren M. Black's Form 4 filing for LifeStance Health Group, Inc. (LFST).
- 1 reported transaction and 0 derivative rows are listed below.
- Accepted by SEC: 14 May 2026, 17:30.
Darren M. Black - 12 May 2026 Form 4 Insider Report for LifeStance Health Group, Inc. (LFST)
- Reporting relationship
- Director
- Issuer ticker
- LFST
- Reported as of
- 12 May 2026
- Net transaction value
- -$47,315,281
- SEC form
- 4
- Accepted by SEC
- 14 May 2026, 17:30:09 UTC
- Prior SEC filing
- 04 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Adam Hennessey, POA for Darren M. Black
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Darren M. Black filed Form 4 for LifeStance Health Group, Inc. (LFST) on 14 May 2026.
Change
- Previous filing in this sequence was filed on 04 Mar 2026.
- Current net transaction value: -$47,315,281.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001843861
Primary reporting owner
BLACK DARREN M.
- Relationship
- Director
- Address
- 222 BERKELEY STREET, 18TH FLOOR, BOSTON
- Signature
- /s/ Adam Hennessey, POA for Darren M. Black
- Signature date
- 14 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
LFST
transaction
Common Stock
Sale
- Transaction value
- $47,315,281
- Shares
- -5,899,661
- Change %
- -20%
- Price
- $8.02
- Shares after
- 23,310,115
- Date
- 12 May 2026
- Ownership
- See Footnotes.
- 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
Explanation of responses 4 footnotes
Footnote F1
Represents 3,612,708 shares sold by Summit Partners Growth Equity Fund IX-A, L.P., 2,255,726 shares sold by Summit Partners Growth Equity Fund IX-B, L.P., 25,218 shares sold by Summit Investors GE IX/VC IV, LLC, 3,371 shares sold by Summit Partners Entrepreneur Advisors Fund II, L.P. and 2,638 shares sold by Summit Investors GE IX/VC IV (UK), L.P.
Footnote F2
The reported securities are held as follows: 14,274,150 shares in the name of Summit Partners Growth Equity Fund IX-A, L.P.; 8,912,582 shares in the name of Summit Partners Growth Equity Fund IX-B, L.P.; 99,639 shares in the name of Summit Investors GE IX/VC IV, LLC; 13,320 shares in the name of Summit Partners Entrepreneur Advisors Fund II, L.P.; and 10,424 shares in the name of Summit Investors GE IX/ VC IV (UK), L.P.
Footnote F3
Darren Black is a Managing Director and Member of Summit Master Company, LLC, the general partner of Summit Partners, L.P. Summit Partners, L.P. is the managing member of Summit Partners GE IX, LLC, which is general partner of Summit Partners GE IX, LP, 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 managing member 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 three person investment committee, currently composed of Peter Y. Chung, 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. 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.