Summit Partners L P 13F holdings
Summit Partners L P reported 5 positions with a total reported value of $608.9M as of 2026-06-30, in its 13F for Q2 2026, filed 2026-07-30. Top holdings by reported value: KVYO KLAVIYO INC (46.8%), LFST LIFESTANCE HEALTH GROUP INC (41.0%), A K A BRANDS HLDG CORP (10.6%), ATEN A10 NETWORKS INC (1.2%), MTSI MACOM TECH SOLUTIONS HLDGS I (0.4%). Against 2026-03-31 it opened 0 new positions and exited 2. Next 13F due by 2026-11-14, the legal deadline 45 days after the quarter ending 2026-09-30.
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Top holdings
5 largest of 5 positions · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| KVYO KLAVIYO INC | 18,852,778 | $284.7M | 46.8% |
| LFST LIFESTANCE HEALTH GROUP INC | 23,310,115 | $249.7M | 41.0% |
| A K A BRANDS HLDG CORP | 6,053,693 | $64.8M | 10.6% |
| ATEN A10 NETWORKS INC | 200,065 | $7.5M | 1.2% |
| MTSI MACOM TECH SOLUTIONS HLDGS I | 6,005 | $2.3M | 0.4% |
SEC FORM 13F · Q2 2026 · VALUES AS REPORTED, NOT PRICES
New positions this quarter
Held at 2026-06-30, not at 2026-03-31 · 0 in all · reported value as of 2026-06-30
No new positions.
Sold out
Held at 2026-03-31, gone by 2026-06-30 · 2 in all · reported value as of 2026-03-31
Biggest increases and decreases
Positions held at both quarter ends, by change in shares · reported value as of 2026-06-30
Increases
No position was increased.
Decreases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| LFST LIFESTANCE HEALTH GROUP INC | 29,209,776 | 23,310,115 | -20.2% | $249.7M |
| MTSI MACOM TECH SOLUTIONS HLDGS I | 49,273 | 6,005 | -87.8% | $2.3M |
CIK 830588 · 13F FILINGS ON EDGAR · INFORMATIONAL ONLY
