SUMMIT PARTNERS L P

BOSTON, MA · CIK 830588 · 13F filing filed 2025-11-04

SEC-registered investment adviser since 2005 · limited partnership

Assets managed$42.0bn
Staff218 · 118 in investment roles
Main clients (by assets)Private funds 100%
Private funds87 · $42.0bn gross assets
Websitesummitpartners.com
Form ADV · 2026-08-20SEC adviser record

Legal entitySUMMIT PARTNERS, L.P. (US)

$1.4bn reported value -12.1% vs Q1 2025

7positions

100.0%in top 10

1 new 0 added 1 reduced 3 sold out vs Q1 2025

Holdings, Q2 2025

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	KLAVIYO INC COM SER A KVYO	KVYO	30,827,778	$1.0bn73.01%	73.01%	Reduced -8.0m	-8,000,000 -20.6%
2	LIFESTANCE HEALTH GROUP INC COM LFST	LFST	41,932,358	$216.8m15.29%	15.29%	Unchanged
3	A K A BRANDS HLDG CORP COM SHS AKA	AKA	6,053,693	$62.4m4.40%	4.40%	Unchanged
4	AVEANNA HEALTHCARE HLDGS INC COM AVAH	AVAH	9,651,422	$50.5m3.56%	3.56%	New
5	JAMF HLDG CORP COM JAMF	JAMF	4,475,381	$42.6m3.00%	3.00%	Unchanged
6	MACOM TECH SOLUTIONS HLDGS I COM MTSI	MTSI	47,650	$6.8m0.48%	0.48%	Unchanged
7	A10 NETWORKS INC COM ATEN	ATEN	187,367	$3.6m0.26%	0.26%	Unchanged

Sold out since Q1 2025

Security	Ticker	Shares held before	Value then
SOLO BRANDS INC		44,034,960	$7.4m44.0m shares
MARKFORGED HOLDING CORPORATI		1,473,154	$6.9m1.5m shares
8X8 INC NEW EGHT	EGHT	69,842	$139.7k69.8k shares

Stakes above 5%

Companies where this manager has reported owning more than 5% of a class of shares, on Schedule 13D (may seek influence) or 13G (passive): its latest filing for each, from 19 Dec 2024 on.

Company	Ticker	Stake	Change	Schedule	Last filed
KLAVIYO INC KVYO · 13G · filed 2025-11-13	KVYO	12.0%≈ $284.7m	-8.8 pts	13G	2025-11-13
LIFESTANCE HEALTH GROUP INC LFST · 13G · filed 2026-08-11	LFST	6.1%≈ $249.7m	-1.4 pts	13G	2026-08-11

Trades reported as a company insider in Q2 2025

Owning 10% or more of a company, or having someone on its board, makes this manager an insider there: it reports its trades in that company's shares on Form 4 within two business days. Open-market and private purchases and sales only.

Date	Company	Ticker	Trade	Shares	Value	Their holding
2025-06-04	KLAVIYO INC 10% owner · See footnotes	KVYO	Sold	4,000,000	$133.4m4.0m shares	-100%
2025-05-19	KLAVIYO INC 10% owner · See footnotes	KVYO	Sold	4,000,000	$132.0m4.0m shares	-100%