SUMMIT PARTNERS L P

CIK 0000830588 · BOSTON, MA · Quarter end: 2026-06-30 · Filed on: 2026-07-30 · Open the SEC source ↗

SUMMIT PARTNERS L P reported 5 positions worth $608.9M as of June 30, 2026 (13F filed July 30, 2026). Largest holding: KVYO (46.8%).

Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.

$608.9M

2026 Q2

Positions

Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.

100.0%

Est. Net Flow (Q)

—

2026 Q2

Positions Changes Mix History BacktestPRO

5 positions shown

#	Symbol	Company	Type	Value ↓	% Port.	Shares	1Y	YTD
▸ 1	KVYO	KLAVIYO INC	SH	$284.7M	46.75%	18,852,778	—	—
▸ 2	LFST	LIFESTANCE HEALTH GROUP INC	SH	$249.7M	41.00%	23,310,115	—	—
▸ 3	AKA	A K A BRANDS HLDG CORP	SH	$64.8M	10.65%	6,053,693	—	—
▸ 4	ATEN	A10 NETWORKS INC	SH	$7.5M	1.23%	200,065	—	—
▸ 5	MTSI	MACOM TECH SOLUTIONS HLDGS I	SH	$2.3M	0.38%	6,005	—	—

Read the 2026-Q2 quarterly report · 13F Filing Calendar

Frequently Asked Questions

What stocks does SUMMIT PARTNERS L P hold as of Q2 2026?

SUMMIT PARTNERS L P reported 5 positions worth $608.9M in its Q2 2026 13F filing. Largest positions: KVYO (46.8%), LFST (41.0%), AKA (10.6%), ATEN (1.2%) and MTSI (0.4%).

What did SUMMIT PARTNERS L P buy in Q2 2026?

No previous quarter is available yet; the comparison appears with the next filing.

What did SUMMIT PARTNERS L P sell in Q2 2026?

No previous quarter is available yet.

13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.