SUMMIT PARTNERS L P

Updated 7 days ago

Managed by Summit Partners L P • Latest filing Q3 2026

Portfolio value

$490.9M

Q3 2026

Filings

Quarterly 13F history

Top-10 concentration

100.0%

Weight of largest holdings

Annualized return

—

Implied from 13F holdings

Portfolio value history

13F-disclosed portfolio value over 6 quarters

Show data table

Period	Portfolio value
Q2 2025	$1.4B
Q3 2025	$924.3M
Q4 2025	$1.1B
Q1 2026	$670.2M
Q2 2026	$608.9M
Q3 2026	$490.9M

Top holdings

5 positions as of Q3 2026

View filing

#	Stock	Value	Shares	% Portfolio	Change
1	K KSS History → KLAVIYO INC	$217.9M	13.85M	44.39%	—
2	L LFST History → LIFESTANCE HEALTH GROUP INC	$200M	16.62M	40.74%	—
3	? N/A A K A BRANDS HLDG CORP	$65.9M	6.05M	13.42%	—
4	A ATEN History → A10 NETWORKS INC	$5.4M	200.1K	1.10%	—
5	M MTSI History → MACOM TECH SOLUTIONS HLDGS I	$1.7M	6.0K	0.35%	—

1.KSS History →

KLAVIYO INC

Value

$217.9M

13.85M

% Port

44.39%

2.LFST History →

LIFESTANCE HEALTH GROUP INC

Value

$200M

16.62M

% Port

40.74%

3.N/A

A K A BRANDS HLDG CORP

Value

$65.9M

6.05M

% Port

13.42%

4.ATEN History →

A10 NETWORKS INC

Value

$5.4M

200.1K

% Port

1.10%

5.MTSI History →

MACOM TECH SOLUTIONS HLDGS I

Value

$1.7M

6.0K

% Port

0.35%

Explore

All funds Consensus buys Trending this quarter Compare portfolios What is a 13F?Filing deadlines