SUMMIT PARTNERS L P

BOSTON, MA · CIK 830588 · 13F filing filed 2024-10-31

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)

$2.2bn reported value +33.3% vs Q2 2024

9positions

100.0%in top 10

1 new 0 added 1 reduced 1 sold out vs Q2 2024

Holdings, Q3 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	46,427,778	$1.6bn73.34%	73.34%	Reduced -1.3m	-1,313,851 -2.8%
2	LIFESTANCE HEALTH GROUP INC COM LFST	LFST	41,932,358	$293.5m13.11%	13.11%	Unchanged
3	A K A BRANDS HLDG CORP COM SHS AKA	AKA	6,053,693	$142.9m6.38%	6.38%	Unchanged
4	JAMF HLDG CORP COM JAMF	JAMF	4,475,381	$77.6m3.47%	3.47%	Unchanged
5	SOLO BRANDS INC COM CL A COM CL A		44,034,960	$62.1m2.77%	2.77%	Unchanged
6	A10 NETWORKS INC COM ATEN	ATEN	606,263	$8.8m0.39%	0.39%	Unchanged
7	MARKFORGED HOLDING CORPORATI COM NEW COM NEW		1,473,154	$7.0m0.31%	0.31%	New
8	MACOM TECH SOLUTIONS HLDGS I COM MTSI	MTSI	45,512	$5.1m0.23%	0.23%	Unchanged
9	8X8 INC NEW COM EGHT	EGHT	52,919	$108.0k0.00%	0.00%	Unchanged

Sold out since Q2 2024

Security	Ticker	Shares held before	Value then
MARKFORGED HOLDING CORPORATI		14,731,565	$6.0m14.7m 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 Q3 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
2024-09-13	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	113,561	$3.6m113.6k shares	-100%
2024-09-12	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	107,205	$3.4m107.2k shares	-100%
2024-09-11	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	2,942	$91.2k2.9k shares	-100%
2024-09-03	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	6,039	$190.4k6.0k shares	-100%
2024-08-30	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	1,300	$41.1k1.3k shares	-100%
2024-08-29	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	16,931	$534.2k16.9k shares	-100%
2024-08-28	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	27,445	$869.5k27.4k shares	-100%
2024-08-27	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	67,436	$2.2m67.4k shares	-100%
2024-08-26	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	90,502	$2.9m90.5k shares	-100%
2024-08-23	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	305,638	$9.9m305.6k shares	-100%
2024-08-22	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	82,499	$2.6m82.5k shares	-100%
2024-08-21	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	113,850	$3.6m113.8k shares	-100%
2024-08-20	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	135,902	$4.3m135.9k shares	-100%
2024-08-16	KLAVIYO INC 10% owner · See footnote	KVYO	Sold	242,601	$7.7m242.6k shares	-100%