CIK: 0000830588
Total reported value
$670.2M
Reporting period: 2026-03-31 · Number of holdings: 7
SUMMIT PARTNERS L P disclosed 7 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $670.2M and a quarterly turnover rate of 45.2%.
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Summit Partners L P's disclosed holdings carry a Herfindahl concentration index of 0.389 — mathematically equivalent to about 3 equally-sized positions, well below its 7 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 1.42), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 2% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Add LFST
-12.9% -$49.9M
Trim KVYO
0.0% -$245.3M
Add AKA
0.0% -$2.3M
Add MTSI
+3.4% $2.8M
Trim AVAH
-27.8% -$26.6M
Add ATEN
+6.8% $1.3M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | KVYO | Klaviyo Inc-a | Stock-Other | 54.74% | -3.50% | — | |
| 2 | LFST | Lifestance Health Group INC | Stock-Other | 27.76% | +5.30% | -12.87% | |
| 3 | AKA | Aka Brands Holding CORP | Stock-Other | 9.32% | +3.16% | — | |
| 4 | AVAH | Aveanna Healthcare Holdings | Stock-Other | 5.23% | -0.64% | -27.81% | |
| 5 | MTSI | Macom Technology Solutions H | Stock-Tech | 1.63% | +0.85% | +3.41% | |
| 6 | ATEN | A10 Networks INC | Stock-Other | 0.69% | +0.37% | +6.78% | |
| 7 | SBDS | Solo Brands INC - Class A | Stock-Other | 0.62% | -0.01% | — |
Performance for Q3 2026
-4.7%
Performance Last 4 Quarters
-33.4%
Based on 72% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 7 | $670.2M | 45 | |
| 2025-12-31 | 8 | $1.1B | 20 | |
| 2025-09-30 | 8 | $924.3M | 52 | |
| 2025-06-30 | 7 | $1.4B | 20 | |
| 2025-03-31 | 9 | $1.6B | 100 | |
| 2024-12-31 | 8 | $2.2B | 0 | |
| 2024-09-30 | 9 | $2.2B | 0 | |
| 2024-06-30 | 9 | $1.7B | 0 | |
| 2024-03-31 | 10 | $1.8B | 0 | |
| 2023-12-31 | 11 | $2.7B | 0 | |
| 2023-09-30 | 11 | $2.9B | 0 | |
| 2023-06-30 | 10 | $1.4B | 0 | |
| 2023-03-31 | 10 | $1.4B | 0 | |
| 2022-12-31 | 10 | $1.2B | 0 | |
| 2022-09-30 | 11 | $1.4B | 0 | |
| 2022-06-30 | 11 | $1.5B | 0 | |
| 2022-03-31 | 12 | $2.3B | 0 | |
| 2021-12-31 | 11 | $3.1B | 0 | |
| 2021-09-30 | 9 | $2.9B | 0 | |
| 2021-06-30 | 5 | $1.9B | 100 | |
| 2021-03-31 | 4 | $626.7M | 26 | |
| 2020-12-31 | 5 | $488.5M | 41 | |
| 2020-09-30 | 6 | $350.6M | 57 | |
| 2020-06-30 | 5 | $209.0M | 15 | |
| 2020-03-31 | 5 | $180.3M | 15 | |
| 2019-12-31 | 6 | $208.4M | 84 | |
| 2019-09-30 | 8 | $508.8M | 28 | |
| 2019-06-30 | 8 | $560.2M | 70 | |
| 2019-03-31 | 7 | $452.4M | 46 | |
| 2018-12-31 | 7 | $641.8M | 17 | |
| 2018-09-30 | 8 | $728.8M | 100 | |
| 2018-06-30 | 10 | $804.4M | 100 | |
| 2018-03-31 | 7 | $1.2B | 46 | |
| 2017-12-31 | 7 | $813.8M | 100 | |
| 2017-09-30 | 6 | $136.2M | 12 | |
| 2017-06-30 | 6 | $137.6M | 52 | |
| 2017-03-31 | 7 | $233.5M | 50 | |
| 2016-12-31 | 7 | $367.7M | 59 | |
| 2016-09-30 | 6 | $453.6M | 100 | |
| 2016-06-30 | 2 | $115.7M | 100 | |
| 2016-03-31 | 3 | $173.4M | 59 | |
| 2015-12-31 | 3 | $318.9M | 28 | |
| 2015-09-30 | 3 | $239.6M | 23 | |
| 2015-06-30 | 3 | $301.7M | 9 | |
| 2015-03-31 | 3 | $277.0M | 12 | |
| 2014-12-31 | 4 | $311.1M | 73 | |
| 2014-09-30 | 6 | $415.8M | 19 | |
| 2014-06-30 | 5 | $423.5M | 53 | |
| 2014-03-31 | 4 | $295.6M | 88 | |
| 2013-12-31 | 6 | $655.6M | 42 | |
| 2013-09-30 | 5 | $867.6M | 11 | |
| 2013-06-30 | 5 | $860.4M | 100 |
Summit Partners L P's most significant position changes for 2026-03-31: Sold out: Jamf Holding CORP (JAMF); Trim: Lifestance Health Group INC (LFST) — shares -12.87%; Add: Macom Technology Solutions H (MTSI) — shares +3.41%; Trim: Aveanna Healthcare Holdings (AVAH) — shares -27.81%; Add: A10 Networks INC (ATEN) — shares +6.78%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | LFST | Lifestance Health Group INC | +5.3% | -12.87% | Trim |
| 2 | AKA | Aka Brands Holding CORP | +3.2% | — | Unchanged |
| 3 | MTSI | Macom Technology Solutions H | +0.9% | +3.41% | Add |
| 4 | ATEN | A10 Networks INC | +0.4% | +6.78% | Add |
| 5 | SBDS | Solo Brands INC - Class A | 0% | — | Unchanged |
| 6 | AVAH | Aveanna Healthcare Holdings | -0.6% | -27.81% | Trim |
| 7 | KVYO | Klaviyo Inc-a | -3.5% | — | Unchanged |
| 8 | JAMF | Jamf Holding CORP | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-08 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-06 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-04 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-11-04 | Amendment | View on EDGAR |
| 2025-06-30 | 2025-07-16 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-05 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-04 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-10-31 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-18 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-01-12 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-10-24 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-07-21 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-04-20 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-04 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-07-26 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-11 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-09 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-12 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-07-26 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-04-23 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-03 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-12 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-07 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-04-21 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-05 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-10-22 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-01 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-13 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-11 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-10-25 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-07-13 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-04-17 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-09 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-10-24 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-07-25 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-02 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-01-30 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-10 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-11-10 | Amendment | View on EDGAR |
| 2016-06-30 | 2016-07-12 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-04-15 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-01-15 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-03 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-07-07 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-04-08 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-02 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-21 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-07-22 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-04-08 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-01-14 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-10-22 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-07-30 | 13F-HR | View on EDGAR |
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