SUMMIT PARTNERS L P

BOSTON, MA · CIK 830588 · 13F filing filed 2024-07-18

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)

$1.7bn reported value -7.3% vs Q1 2024

9positions

100.0%in top 10

0 new 1 added 2 reduced 1 sold out vs Q1 2024

Holdings, Q2 2024

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	47,741,629	$1.2bn70.72%	70.72%	Unchanged
2	LIFESTANCE HEALTH GROUP INC COM LFST	LFST	41,932,358	$205.9m12.25%	12.25%	Reduced -3.8m	-3,802,345 -8.3%
3	SOLO BRANDS INC COM CL A COM CL A		44,034,960	$100.4m5.97%	5.97%	Unchanged
4	A K A BRANDS HLDG CORP COM SHS AKA	AKA	6,053,693	$92.3m5.49%	5.49%	Unchanged
5	JAMF HLDG CORP COM JAMF	JAMF	4,475,381	$73.8m4.39%	4.39%	Unchanged
6	A10 NETWORKS INC COM ATEN	ATEN	606,263	$8.4m0.50%	0.50%	Reduced -3.3m	-3,296,047 -84.5%
7	MARKFORGED HOLDING CORPORATI COM COM		14,731,565	$6.0m0.36%	0.36%	Added +136.4k	+136,364 0.9%
8	MACOM TECH SOLUTIONS HLDGS I COM MTSI	MTSI	45,512	$5.1m0.30%	0.30%	Unchanged
9	8X8 INC NEW COM EGHT	EGHT	52,919	$117.5k0.01%	0.01%	Unchanged

Sold out since Q1 2024

Security	Ticker	Shares held before	Value then
CASA SYS INC		34,124,480	$9.3m34.1m 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 2024

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
2024-05-24	LIFESTANCE HEALTH GROUP INC Manager of GP of 10% owner · See Footnotes.	LFST	Sold	3,802,345	$22.4m3.8m shares	-8%