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Mainsail Management Company, LLC Historical SEC 13F Holdings & Archive (Q3 2025)
Mainsail Management Company, LLCCIK: 0001883367
Concentrated strategyHigh-turnover trader
Total reported value
$66.0M
Reporting period: 2025-09-30 · Number of holdings: 1
MAINSAIL MANAGEMENT COMPANY, LLC disclosed 1 holdings in its latest 13F filing for the period ending 2025-09-30, with total reported value of $66.0M and a quarterly turnover rate of 75.4%.
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Personality snowflake
- Concentration
- 100
- Portfolio Stability
- 75.44
- Momentum
- 50
- Sector conviction
- 0
- Diversification
- 2
- Sizing Uniformity
- —
Sector classification currently covers about 0% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govAdd BRLT
0.0% $15.6M
Sold out TTAN
Sold out SSTI
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | BRLT | Brilliant Earth Group Inc-a | Stock-Other | 100.00% | +40.43% | — |
Portfolio Performance
Performance for Q3 2026
+4.7%
Performance Last 4 Quarters
-51.6%
- Stdev
- +64.8%
- Beta
- +0.94
- Alpha
- -31%
- Max Drawdown
- -71.8%
- Annualized Perf
- -26.7%
- Batting Avg vs S&P
- +41.7%
- Sortino
- -0.31
- Stutzer
- -0.05
- Treynor
- -0.13
- Sterling
- -0.48
- Calmar
- -0.37
- Information Ratio
- -0.5
- Tracking Error
- +63.7%
- Stdev Down
- +39.1%
- Winning Months %
- +36.1%
- Losing Months %
- +63.9%
- Best 12 Months
- +48.1%
- Worst 12 Months
- -52.5%
- Efficiency Ratio
- +0.12
- Sharpe
- -0.19
- Stdev Sectors
- —
- Skewness
- +1.23
- Kurtosis
- +1.5
- Upside Potential
- +2.07
Reported value over time
Sector allocation
Not enough sector-mapped data yet
Sector allocation over time
Quarterly history
Holding changes this quarter
Mainsail Management Company, LLC's most significant position changes for 2025-09-30: Sold out: Servicetitan Inc-a (TTAN); Sold out: Soundthinking Inc (SSTI).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | BRLT | Brilliant Earth Group Inc-a | +40.4% | — | Unchanged |
| 2 | TTAN | Servicetitan Inc-a | — | EXIT | Sold out |
| 3 | SSTI | Soundthinking Inc | — | EXIT | Sold out |
Filing History
FAQ
What is Mainsail Management Company, LLC and what type of investor is it?
Mainsail Management Company, LLC is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2025-09-30), the firm manages a tracked equity portfolio valued at approximately $66.0M, spread across 1 disclosed positions.
What are Mainsail Management Company, LLC's largest equity positions?
Based on the latest 13F filing, Mainsail Management Company, LLC's top holdings by market value are:
1. Brilliant Earth Group Inc-a (BRLT) — $66.0M (100.0%)
What changes did Mainsail Management Company, LLC make in its most recent portfolio filing?
In the latest quarter, Mainsail Management Company, LLC took a more defensive posture — trimming 0 positions and completely exiting 2 holdings. The largest of these moves: Sold out: Servicetitan Inc-a (TTAN); Sold out: Soundthinking Inc (SSTI)
What sectors does Mainsail Management Company, LLC focus on?
Sector breakdown data is not yet available for Mainsail Management Company, LLC. Check back after the next 13F processing cycle.
Investment Profile
Mainsail Management Company, LLC returned an annualized -26.7% over the trailing 36 months — underperforming the S&P 500 by 31.0 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 0.94 (roughly in line with the market) and a 42% quarterly batting average against the index.
Its portfolio is concentrated and fast-trading.
Its turnover score has risen from 0 to 75 over the past 4 quarters — a shift toward more active trading.
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VA
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KC
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Sector conviction100.0
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Developer Access
Access Mainsail Management Company, LLC's institutional profile programmatically:
REST API
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