SUMMIT PARTNERS L P

13D and 13G Filings

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Every filing since 12/18/2024, newest first.

Issuer	Symbol	CUSIP	% of Class	Shares	Form	Filed
LifeStance Health Group, Inc. 13G/A Amendment 4 LFST · 53228F101	LFST	53228F101	6.1%	23,310,115	13G/A Amendment 4	8/11/2026 Event 6/30/2026
Summit Partners, L.P.			6.1%	23,310,115
Summit Partners Growth Equity Fund IX-A, L.P.			3.7%	14,274,150
Summit Partners Growth Equity Fund IX-B, L.P.			2.3%	8,912,582
Summit Investors GE IX/VC IV (UK), L.P.			0%	10,424
Summit Partners Entrepreneur Advisors Fund II, L.P.			0%	13,320
Summit Investors GE IX/VC IV, LLC			<0.1%	99,639
LifeStance Health Group, Inc. 13G/A Amendment 3 LFST · 53228F101	LFST	53228F101	7.5%	29,209,776	13G/A Amendment 3	5/8/2026 Event 3/31/2026
Summit Partners, L.P.			7.5%	29,209,776
Summit Partners Growth Equity Fund IX-A, L.P.			4.6%	17,886,858
Summit Partners Growth Equity Fund IX-B, L.P.			2.9%	11,168,308
Summit Investors GE IX/VC IV (UK), L.P.			0%	13,062
Summit Partners Entrepreneur Advisors Fund II, L.P.			0%	16,691
Summit Investors GE IX/VC IV, LLC			<0.1%	124,857
Klaviyo, Inc. 13G/A Amendment 5 KVYO · 49845K101	KVYO	49845K101	12.0%	18,852,778	13G/A Amendment 5	11/13/2025 Event 9/30/2025
Summit Partners Growth Equity Fund IX-A, L.P.			7.1%	11,142,414
Summit Partners Growth Equity Fund IX-B, L.P.			4.4%	6,957,168
Summit Partners Co-Invest (Kiwi), L.P.			0.4%	687,035
Summit Investors GE IX/VC IV, LLC			<0.1%	58,561
Summit Investors GE IX/VC IV (UK), L.P.			<0.1%	7,600
Summit Partners, L.P.			12.0%	18,852,778
LifeStance Health Group, Inc 13G/A Amendment 2 LFST · 53228F101	LFST	53228F101	8.6%	33,524,715	13G/A Amendment 2	11/13/2025 Event 9/30/2025
Summit Partners, L.P.			8.6%	33,524,715
Summit Partners Growth Equity Fund IX-A, L.P.			5.3%	20,529,149
Summit Partners Growth Equity Fund IX-B, L.P.			3.3%	12,818,117
Summit Investors GE IX/VC IV (UK), L.P.			<0.1%	14,991
Summit Partners Entrepreneur Advisors Fund II, L.P.			<0.1%	19,157
Summit Investors GE IX/VC IV, LLC			<0.1%	143,301
Klaviyo, Inc. 13G/A Amendment 4 KVYO · 49845K101	KVYO	49845K101	20.9%	30,827,778	13G/A Amendment 4	8/8/2025 Event 6/30/2025
Summit Partners Growth Equity Fund IX-A, L.P.			12.3%	18,219,907
Summit Partners Growth Equity Fund IX-B, L.P.			7.7%	11,376,255
Summit Partners Co-Invest (Kiwi), L.P.			0.8%	1,123,429
Summit Investors GE IX/VC IV, LLC			0.1%	95,759
Summit Investors GE IX/VC IV (UK), L.P.			<0.1%	12,428
Summit Partners, L.P.			20.9%	30,827,778
Klaviyo, Inc. 13G/A Amendment 3 KVYO · 49845K101	KVYO	49845K101	30.0%	38,827,778	13G/A Amendment 3	5/7/2025 Event 3/31/2025
Summit Partners Growth Equity Fund IX-A, L.P.			17.7%	22,948,085
Summit Partners Growth Equity Fund IX-B, L.P.			11.1%	14,328,463
Summit Partners Co-Invest (Kiwi), L.P.			1.1%	1,414,967
Summit Investors GE IX/VC IV, LLC			0.1%	120,609
Summit Investors GE IX/VC IV (UK), L.P.			<0.1%	15,654
Summit Partners, L.P.			30.0%	38,827,778
Klaviyo, Inc. 13G/A Amendment 2 KVYO · 49845K101	KVYO	49845K101	34.1%	40,827,778	13G/A Amendment 2	2/7/2025 Event 12/31/2024
Summit Partners Growth Equity Fund IX-A, L.P.			20.2%	24,130,130
Summit Partners Growth Equity Fund IX-B, L.P.			12.6%	15,066,515
Summit Partners Co-Invest (Kiwi), L.P.			1.2%	1,487,851
Summit Investors GE IX/VC IV, LLC			0.1%	126,822
Summit Investors GE IX/VC IV (UK), L.P.			<0.1%	16,460
Summit Partners, L.P.			34.1%	40,827,778