Summit Partners portfolio
Private equity or venture capitalPortfolio as of Sep 30, 2026 (Q3 2026) · filed with the SEC on Oct 29, 2026 · data updated on Nov 5, 2026 · Q3 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Summit Partners reported a $491M portfolio of 5 positions to the SEC as of the end of Q3 2026. Its largest positions are KVYO, LFST, AKA.
Sections with a free account
What changed this quarter
2 positions with a change (2 trimmed). 2 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- LifeStance Health Group−29%fewer sharesReduced41.0% → 40.7%
- Klaviyo−27%fewer sharesReduced46.8% → 44.4%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- KlaviyoKVYO44.4%
- LifeStance Health GroupLFST40.7%
- a.k.a. Brands HoldingAKA13.4%
- A10 NetworksATEN1.1%
- MACOM Technology Solutions HoldingsMTSI0.3%
“Since”: first quarter of the current run, unbroken until today. In the details, prices are the quarter-end prices of the quarters in which it added shares, per the 13F. The manager may have bought at any price within each quarter; the SEC only publishes the value at quarter end.
Portfolio by sector
- ● Information Technology 46%
- ● Health Care 41%
- ● Consumer Discretionary 13%
How its portfolio changed (8 quarters)
Q3 2026: 5
Q3 2026: 100%
Q3 2026: 13.1%
Traded turnover: the weight it bought plus the weight it sold in the quarter, divided by two, excluding price moves. The plain “turnover” in the header does include that effect. With a free account: the full history and sectors over time.
13F filings with amendments or confidential positions
- 13F Q2 2025 ↗filed Jul 16, 2025Amendment of Nov 4, 2025 (replaces the original) ↗
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Private equity or venture capital, per its Form ADV of Aug 20, 2026 (high confidence).
The data, as reported: SUMMIT PARTNERS, L.P. (CRD 135271): 7.B private funds: 87 pe (gross assets $42.0 bn); 5.D assets by client type: pooled vehicles 100% (of $42.0 bn) · 13F: 88% of the portfolio was already held when the stock started trading
The type comes from a rule applied to that data. If it looks wrong, tell us.
Not counted as a concentrated manager: it is a private equity or venture firm; its stocks are usually holdings that went public. Its portfolio is shown all the same, but it is left out of manager counts, the consensus and the ranking. How this is decided
Managers of a similar size
A 13F portfolio value between a third and three times this one, whatever the type of filer. It is not a comparison of what they hold.
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