Mainsail Management Company, LLC Investment Portfolio — 13F Data

CIK: 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/Contrarian: 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.

Recent moves

Add 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

-21.5%

Performance Last 4 Quarters

-12.3%

Stdev: +92.7%
Beta: +1.34
Alpha: -35.5%
Max Drawdown: -65.6%
Annualized Perf: -32.8%
Batting Avg vs S&P: +39.4%
Sortino: -0.2
Stutzer: -0.03
Treynor: -0.06
Sterling: -0.53
Calmar: -0.5
Information Ratio: -0.32
Tracking Error: +91.3%
Stdev Down: +43.6%
Winning Months %: +33.3%
Losing Months %: +66.7%
Best 12 Months: +37.2%
Worst 12 Months: -53.7%
Efficiency Ratio: +0.12
Sharpe: -0.09
Stdev Sectors: —
Skewness: +2.89
Kurtosis: +10.33
Upside Potential: +2.23

Reported value over time

Sector allocation

Not enough sector-mapped data yet

Sector allocation over time

Quarterly history

Period	Holdings	Total value	Stability	Top holdings
2025-09-30	1	$66.0M	75	1BRLT Top holdings2025-09-30 1.BRLT
2025-06-30	2	$66.1M	0	1BRLT 2TTAN Top holdings2025-06-30 1.BRLT 2.TTAN
2025-03-31	3	$84.6M	91	1BRLT 2TTAN 3SSTI Top holdings2025-03-31 1.BRLT 2.TTAN 3.SSTI
2024-12-31	1	$35.3M	0	1TTAN Top holdings2024-12-31 1.TTAN
2024-09-30	2	$69.3M	0	1BRLT 2SSTI Top holdings2024-09-30 1.BRLT 2.SSTI
2024-06-30	2	$71.9M	0	1BRLT 2SSTI Top holdings2024-06-30 1.BRLT 2.SSTI
2024-03-31	2	$96.8M	0	1BRLT 2SSTI Top holdings2024-03-31 1.BRLT 2.SSTI
2023-12-31	2	$121.0M	0	1BRLT 2SSTI Top holdings2023-12-31 1.BRLT 2.SSTI
2023-09-30	2	$95.9M	0	1BRLT 2SSTI Top holdings2023-09-30 1.BRLT 2.SSTI
2023-06-30	2	$126.0M	0	1BRLT 2SSTI Top holdings2023-06-30 1.BRLT 2.SSTI
2023-03-31	2	$128.6M	0	1BRLT 2SSTI Top holdings2023-03-31 1.BRLT 2.SSTI
2022-12-31	2	$141.6M	0	1BRLT 2SSTI Top holdings2022-12-31 1.BRLT 2.SSTI

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).

Position changes disclosed by Mainsail Management Company, LLC for the quarter ending 2025-09-30, including ticker, issuer, weight change, shares change, and action
#	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

Period	Filed	Type	EDGAR
2025-09-30	2025-11-06	13F-HR	View on EDGAR
2025-06-30	2025-08-04	13F-HR	View on EDGAR
2025-03-31	2025-05-13	13F-HR	View on EDGAR
2024-12-31	2025-05-13	Amendment	View on EDGAR
2024-12-31	2025-02-13	13F-HR	View on EDGAR
2024-09-30	2024-11-13	13F-HR	View on EDGAR
2024-06-30	2024-08-12	13F-HR	View on EDGAR
2024-03-31	2024-05-07	13F-HR	View on EDGAR
2023-12-31	2024-02-12	13F-HR	View on EDGAR
2023-09-30	2023-11-07	13F-HR	View on EDGAR
2023-06-30	2023-08-14	13F-HR	View on EDGAR
2023-03-31	2023-05-12	13F-HR	View on EDGAR
2022-12-31	2023-02-14	13F-HR	View on EDGAR

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.

Peer Institutions

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Redmont Wealth Advisors LLC

CIK 0001910482

Total reported value

$66.0M

307 stks

2025-12-31

Stale — no recent filing

Concentration15.9

Portfolio Stability22.3

Sector conviction61.2

AUM within 0.0% of this institution

View detail

Emeth Value Capital, LLC

CIK 0002053013

Total reported value

$66.0M

4 stks

2026-03-31

Concentration100.0

Portfolio Stability34.3

Sector conviction100.0

AUM within 0.1% of this institution

View detail

KeyPoint Capital Management, LLC

CIK 0001571207

Total reported value

$65.9M

22 stks

2015-12-31

Stale — no recent filing

Concentration23.0

Portfolio Stability100.0

Sector conviction100.0

AUM within 0.2% of this institution

View detail

Personality snowflake

Concentration

100

Portfolio Stability

75.44

Momentum/Contrarian

Sector conviction

Diversification

Sizing Uniformity

—

Ticker

Issuer

Asset Subclass

Weight

Weight Change

Shares Change

4Q Trend

BRLT

Brilliant Earth Group Inc-a

Stock-Other

100.00%

+40.43%

—

Portfolio Performance

Performance for Q3 2026

-21.5%

Performance Last 4 Quarters

-12.3%

Stdev: +92.7%
Beta: +1.34
Alpha: -35.5%
Max Drawdown: -65.6%
Annualized Perf: -32.8%
Batting Avg vs S&P: +39.4%
Sortino: -0.2
Stutzer: -0.03
Treynor: -0.06
Sterling: -0.53
Calmar: -0.5
Information Ratio: -0.32
Tracking Error: +91.3%
Stdev Down: +43.6%
Winning Months %: +33.3%
Losing Months %: +66.7%
Best 12 Months: +37.2%
Worst 12 Months: -53.7%
Efficiency Ratio: +0.12
Sharpe: -0.09
Stdev Sectors: —
Skewness: +2.89
Kurtosis: +10.33
Upside Potential: +2.23

Quarterly history

Period	Holdings	Total value	Stability	Top holdings
2025-09-30	1	$66.0M	75	1BRLT Top holdings2025-09-30 1.BRLT
2025-06-30	2	$66.1M	0	1BRLT 2TTAN Top holdings2025-06-30 1.BRLT 2.TTAN
2025-03-31	3	$84.6M	91	1BRLT 2TTAN 3SSTI Top holdings2025-03-31 1.BRLT 2.TTAN 3.SSTI
2024-12-31	1	$35.3M	0	1TTAN Top holdings2024-12-31 1.TTAN
2024-09-30	2	$69.3M	0	1BRLT 2SSTI Top holdings2024-09-30 1.BRLT 2.SSTI
2024-06-30	2	$71.9M	0	1BRLT 2SSTI Top holdings2024-06-30 1.BRLT 2.SSTI
2024-03-31	2	$96.8M	0	1BRLT 2SSTI Top holdings2024-03-31 1.BRLT 2.SSTI
2023-12-31	2	$121.0M	0	1BRLT 2SSTI Top holdings2023-12-31 1.BRLT 2.SSTI
2023-09-30	2	$95.9M	0	1BRLT 2SSTI Top holdings2023-09-30 1.BRLT 2.SSTI
2023-06-30	2	$126.0M	0	1BRLT 2SSTI Top holdings2023-06-30 1.BRLT 2.SSTI
2023-03-31	2	$128.6M	0	1BRLT 2SSTI Top holdings2023-03-31 1.BRLT 2.SSTI
2022-12-31	2	$141.6M	0	1BRLT 2SSTI Top holdings2022-12-31 1.BRLT 2.SSTI

Ticker

Issuer

Weight Change

Shares Change

Action

BRLT

Brilliant Earth Group Inc-a

+40.4%

—

Unchanged

TTAN

Servicetitan Inc-a

—

EXIT

Sold out

SSTI

Soundthinking INC

—

EXIT

Sold out

Filing History

Period	Filed	Type	EDGAR
2025-09-30	2025-11-06	13F-HR	View on EDGAR
2025-06-30	2025-08-04	13F-HR	View on EDGAR
2025-03-31	2025-05-13	13F-HR	View on EDGAR
2024-12-31	2025-05-13	Amendment	View on EDGAR
2024-12-31	2025-02-13	13F-HR	View on EDGAR
2024-09-30	2024-11-13	13F-HR	View on EDGAR
2024-06-30	2024-08-12	13F-HR	View on EDGAR
2024-03-31	2024-05-07	13F-HR	View on EDGAR
2023-12-31	2024-02-12	13F-HR	View on EDGAR
2023-09-30	2023-11-07	13F-HR	View on EDGAR
2023-06-30	2023-08-14	13F-HR	View on EDGAR
2023-03-31	2023-05-12	13F-HR	View on EDGAR
2022-12-31	2023-02-14	13F-HR	View on EDGAR

FAQ

What is Mainsail Management Company, LLC and what type of investor is it?

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?

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.