SUMMIT PARTNERS L P
CIK: 830588
New Positions
0
Increased
0
Exit Positions
0
Holdings (5)
Q3 2026 13F, quarter ended Sep 30, 2026, filed Oct 29, 2026
- KVYO
KLAVIYO INC
$217.9M
13.85M sh44.39%-26.5% - LFST
LIFESTANCE HEALTH GROUP INC
$199.98M
16.62M sh40.74%-28.7% - AKA
A K A BRANDS HLDG CORP
$65.86M
6.05M sh13.42%+0.0% - ATEN
A10 NETWORKS INC
$5.42M
200,065 sh1.10%+0.0% - MTSI
MACOM TECH SOLUTIONS HLDGS I
$1.71M
6,005 sh0.35%+0.0%
| Security | Shares | Value | Change | Weight | Period |
|---|---|---|---|---|---|
 KVYO KLAVIYO INC | 13.85M | $217.9M | -26.5% | 44.39% | Q3 2026 |
 LFST LIFESTANCE HEALTH GROUP INC | 16.62M | $199.98M | -28.7% | 40.74% | Q3 2026 |
 AKA A K A BRANDS HLDG CORP | 6.05M | $65.86M | +0.0% | 13.42% | Q3 2026 |
 ATEN A10 NETWORKS INC | 200,065 | $5.42M | +0.0% | 1.10% | Q3 2026 |
 MTSI MACOM TECH SOLUTIONS HLDGS I | 6,005 | $1.71M | +0.0% | 0.35% | Q3 2026 |
1-5 of 5 holdings
Sector Allocation
SEC Filings
| Form | Description | Filed |
|---|---|---|
About SUMMIT PARTNERS L P
SUMMIT PARTNERS L P is an Investment Adviser that reports its US-listed stock and option positions to the SEC on Form 13F (CIK 830588). Signal8 holds 15 13F filings from it. Its SEC filings list Delaware as its state of incorporation.
Its most recent 13F holdings report covers Q3 2026 (the quarter ended Sep 30, 2026) and was filed on Oct 29, 2026. That report lists 5 securities, not counting options, the same number as in Q2 2026.
Its five largest reported positions, in order, are KLAVIYO INC (KVYO), LIFESTANCE HEALTH GROUP INC (LFST), A K A BRANDS HLDG CORP (AKA), A10 NETWORKS INC (ATEN) and MACOM TECH SOLUTIONS HLDGS I (MTSI).
Recent 13F filings by SUMMIT PARTNERS L P
- Q3 2026: 13F-HR filed Oct 29, 2026, listing 5 securities.
- Q2 2026: 13F-HR filed Jul 30, 2026, listing 5 securities.
- Q1 2026: 13F-HR filed May 8, 2026, listing 7 securities.
- Q4 2025: 13F-HR filed Feb 6, 2026, listing 8 securities.
- Q3 2025: 13F-HR filed Nov 4, 2025, listing 8 securities.
- Q2 2025: 13F-HR/A filed Nov 4, 2025, listing 7 securities.