MAINSAIL MANAGEMENT COMPANY, LLC — 13F Holdings & Portfolio
CIK 1883367 · latest 13F-HR filed 2025-11-06
MAINSAIL MANAGEMENT COMPANY, LLC manages $66.0M in 13F-reported U.S. long-equity assets across 1 reported positions as of its 2025-09-30 13F-HR filing. Its largest disclosed positions are BRLT (100.00%). Quarter over quarter (versus its 2025-06-30 filing) the fund opened 0 new positions and exited 1; 1 existing position rose in reported value and 0 fell.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
Long-equity book
Distinct positions
Filed 2025-11-06
vs 2025-06-30
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q3 25Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q2 25 → Q3 25Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
2 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 100%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Sep 3, 2026.
SUITE 3100
AUSTIN, TX 78701
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| ATKINSON, LYNN, MARIE Control | CHIEF OPERATING OFFICER since Feb 2020 | Less than 5% | Individual |
| MAINSAIL MANAGEMENT COMPANY HOLDINGS, LLC Control | MANAGER since Aug 2022 | 75% or more | Domestic Entity |
| SALISBURY, WILLIAM, RICHARD Control | CHIEF COMPLIANCE OFFICER, CHIEF FINANCIAL OFFICER AND PARTNER since Jul 2016 | Less than 5% | Individual |
| SEDLOFF, ERIN, BROOKE Control | CHIEF LEGAL OFFICER since Jul 2025 | Less than 5% | Individual |
| TURNER, GAVIN, MITCHELL Control | MANAGING DIRECTOR, MANAGING MEMBER since Aug 2004 | Less than 5% | Individual |
| TURNER, GAVIN, MITCHELL Control Indirect owner via MAINSAIL MANAGEMENT COMPANY HOLDINGS, LLC | MANAGING MEMBER since Jul 2022 | 75% or more | Individual |
Ownership & leadership changes · 10 filings with changes since Feb 14, 2012
From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.
- AddedSEDLOFF, ERIN, BROOKE · CHIEF LEGAL OFFICER · Less than 5% · control person
- ChangedSALISBURY, WILLIAM, RICHARD · title CHIEF COMPLIANCE OFFICER, CHIEF FINANCIAL OFFICER AND OPERATING PARTNER → CHIEF COMPLIANCE OFFICER, CHIEF FINANCIAL OFFICER AND PARTNER
- AddedMAINSAIL MANAGEMENT COMPANY HOLDINGS, LLC · MANAGER · 75% or more · control person
- AddedTURNER, GAVIN, MITCHELL · MANAGING MEMBER · 75% or more · indirect via MAINSAIL MANAGEMENT COMPANY HOLDINGS, LLC · control person
- ChangedTURNER, GAVIN, MITCHELL · ownership 75% or more → Less than 5%
- AddedATKINSON, LYNN, MARIE · CHIEF OPERATING OFFICER · Less than 5% · control person
- No longer listedCHERITY AND C. JASON PAYNE FAMILY TRUST · MEMBER · 50–75% · control person · listed since Oct 2008
- No longer listedPAYNE, CHERITY, MORRISON · TRUSTEE · Less than 5% · control person · listed since Oct 2008
- No longer listedPAYNE, CHRISTOPHER, JASON · MANAGING DIRECTOR, TRUSTEE, MANAGING MEMBER · Less than 5% · control person · listed since Aug 2004
- ChangedTURNER, GAVIN, MITCHELL · ownership 50–75% → 75% or more
- ChangedCHERITY AND C. JASON PAYNE FAMILY TRUST · now a control person
- ChangedPAYNE, CHERITY, MORRISON · ownership 50–75% → Less than 5%
- ChangedPAYNE, CHRISTOPHER, JASON · title MANAGING PARTNER, TRUSTEE, MANAGING MEMBER → MANAGING DIRECTOR, TRUSTEE, MANAGING MEMBER; ownership 50–75% → Less than 5%
- ChangedTURNER, GAVIN, MITCHELL · title MANAGING PARTNER, MANAGING MEMBER → MANAGING DIRECTOR, MANAGING MEMBER
- No longer listedMCKINLEY, TAYLOR, ANDERSON · OPERATING PARTNER AND CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Jun 2014
- AddedSALISBURY, WILLIAM, RICHARD · CHIEF COMPLIANCE OFFICER, CHIEF FINANCIAL OFFICER AND OPERATING PARTNER · Less than 5% · control person
- No longer listedWILL, RONNIE, [NMN] · CHIEF COMPLIANCE OFFICER, CHIEF FINANCIAL OFFICER, AND OPERATING PARTNER · Less than 5% · control person · listed since Jul 2015
- Listed againMCKINLEY, TAYLOR, ANDERSON · OPERATING PARTNER AND CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- No longer listedMCKINLEY, TAYLOR, ANDERSON · OPERATING PARTNER AND CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Jun 2014
- AddedWILL, RONNIE, [NMN] · CHIEF COMPLIANCE OFFICER, CHIEF FINANCIAL OFFICER, AND OPERATING PARTNER · Less than 5% · control person
- No longer listedAHLSTROM, LARS, BJORN · CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Jul 2007
- AddedMCKINLEY, TAYLOR, ANDERSON · OPERATING PARTNER AND CHIEF COMPLIANCE OFFICER · Less than 5% · control person
Older changes (1 more filing)
- ListedAHLSTROM, LARS, BJORN · CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ListedCHERITY AND C. JASON PAYNE FAMILY TRUST · MEMBER · 50–75%
- ListedPAYNE, CHERITY, MORRISON · TRUSTEE · 50–75% · control person
- ListedPAYNE, CHRISTOPHER, JASON · MANAGING PARTNER, TRUSTEE, MANAGING MEMBER · 50–75% · control person
- ListedTURNER, GAVIN, MITCHELL · MANAGING PARTNER, MANAGING MEMBER · 50–75% · control person
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
MAINSAIL MANAGEMENT COMPANY, LLC Holdings (2025-09-30)
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | BRILLIANT EARTH GROUP INC | BRLT | 109504100 | $66.0M | 100.00% | 31,898,071 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2025-09-30 | 2025-11-06 | $66.0M | 1 | 0001883367-25-000006 |
| 2025-06-30 | 2025-08-04 | $66.1M | 2 | 0001883367-25-000004 |