Stocks/Funds/CIK 830588

SUMMIT PARTNERS L P

long-term holderconcentrated
Quarterly 13F filings · Latest period 2026-03-31 · CIK 830588
Assets
$670M
-58.4% YoY
Holdings
7
Lifetime alpha vs market
-22.26% annual
Average hold time
4.6 yr
median 2.8 yr

Quarterly history

Cum return -44% vs S&P +52% · α -97% lifetimeAUM $670M · peak $3.1BFlow $-83M (-8%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-4.79%
trims when stocks drop
when a holding falls −10%+
Middle response
-6.91%
baseline attrition
Rally response
-5.45%
trims into rallies
when a holding rises +10%+

Top positions · 7

Ticker$ value% portYoYHold time
KVYOKlaviyo, Inc.$367M54.7%-35.7%2.8 yr
LFSTLifeStance Health Group,$186M27.8%-4.4%5.0 yr
AKAa.k.a. Brands Holding Co$62M9.3%-23.5%2.3 yr
AVAHAveanna Healthcare Holdi$35M5.2%+18.8%1.0 yr
MTSIMACOM Technology Solutio$11M1.6%+121.2%10.3 yr
ATENA10 Networks, Inc.$5M0.7%+43.3%10.5 yr
DTCBSolo Brands, Inc.$4M0.6%0.8 yr

Portfolio composition (YoY)

Industry mix
Software - Infrastructure55.4%-17.6pp$372M
Medical - Care Facilities33.0%+15.7pp$221M
Specialty Retail9.9%+4.4pp$67M
Semiconductors1.6%+1.3pp$11M
Country
US100.0%+0.0pp
Top 5: 98.7% · Top 10: 100.0% · Top 25: 100.0%

Winners

TickerPrev $PnLYoY %
MTSI$5M+0.01B121.2%
ATEN$3M+0.00B43.3%
LFST$279M-0.01B-4.4%
AKA$82M-0.02B-23.5%
KVYO$1.17B-0.42B-35.7%

Losers

TickerPrev $PnLYoY %
KVYO$1.17B-0.42B-35.7%
AKA$82M-0.02B-23.5%
LFST$279M-0.01B-4.4%

Top buys this quarter · 2

MTSI MACOM Technology Solutions Hol+$0M
ATEN A10 Networks, Inc.+$0M

Top sells this quarter · 3

LFST LifeStance Health Group, Inc.$27M
AVAH Aveanna Healthcare Holdings In$14M
JAMF Jamf Holding Corp.exit$0M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$670M7-22.43%+17.59%-40.03%-0.08B
2025-12-31$1.05B8-17.90%+17.72%-35.62%-0.03B
2025-09-30$924M8-20.86%+17.52%-38.38%-0.35B
2025-06-30$1.42B7+25.43%+14.94%+10.49%-0.24B
2025-03-31$1.61B9+17.72%+8.30%+9.41%-0.08B
2024-12-31$2.23B8+39.60%+24.89%+14.72%-0.29B
2024-09-30$2.24B9+6.53%+36.04%-29.51%-0.16B
2024-06-30$1.68B9-41.17%+24.49%-65.66%-0.07B
2024-03-31$1.81B10-27.92%+29.62%-57.55%-0.65B
2023-12-31$2.74B11+10.55%+26.18%-15.62%+0.24B
2023-09-30$2.92B11+8.50%+21.57%-13.07%+1.83B
2023-06-30$1.38B10+52.38%+19.42%+32.96%-0.26B
2023-03-31$1.38B10-15.55%-7.82%-7.73%-0.31B
2022-12-31$1.23B10-15.76%+7.56%-23.32%+0.01B
2022-09-30$1.44B11+10.62%-4.93%+15.55%-0.22B
2022-06-30$1.50B11-34.29%-16.11%-18.18%+0.01B