Stocks/Funds/CIK 934999

DF DENT & CO INC

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 934999
Assets
$5.22B
-30.3% YoY
Holdings
262
Lifetime alpha vs market
-5.51% annual
Average hold time
5.4 yr
median 4.5 yr

Quarterly history

Cum return +30% vs S&P +72% · α -43% lifetimeAUM $5.2B · peak $9.9BFlow $-1.1B (-16%)2016-032017-092019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-2.13%
trims when stocks drop
when a holding falls −10%+
Middle response
-3.75%
baseline attrition
Rally response
-7.79%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
$217M4.2%3.8 yr
$187M3.6%3.5 yr
AMZNAmazon.com, Inc.$166M3.2%+9.5%10.3 yr
HEI-AHEICO Corporation$164M3.1%10.0 yr
VMCVulcan Materials Company$148M2.8%+17.5%7.8 yr
$143M2.7%3.5 yr
TDGTransDigm Group Incorpor$142M2.7%-10.5%10.3 yr
$140M2.7%3.3 yr
ECLEcolab Inc.$138M2.6%+6.0%10.3 yr
MCOMoody's Corporation$129M2.5%-5.6%10.3 yr
$127M2.4%3.5 yr
FASTFastenal Company$124M2.4%+22.1%10.3 yr
MSFTMicrosoft Corporation$109M2.1%-0.6%10.3 yr
$107M2.0%3.5 yr
MPWRMonolithic Power Systems$97M1.9%+89.6%3.8 yr

Portfolio composition (YoY)

Industry mix
Unknown48.7%-0.0pp$2.54B
Aerospace & Defense6.2%-0.4pp$321M
Software - Application4.8%-1.2pp$251M
Specialty Retail3.5%+0.4pp$181M
Chemicals - Specialty3.3%-0.4pp$173M
Semiconductors3.3%+1.1pp$171M
Medical - Diagnostics & Research3.0%-0.9pp$154M
Construction Materials2.8%-0.0pp$148M
Financial - Data & Stock Exchanges2.8%-0.2pp$146M
Industrial - Distribution2.6%+0.2pp$135M
Country
US50.8%+0.8pp
Unknown48.7%-0.0pp
CA0.4%-0.1pp
AU0.2%-0.7pp
CH0.0%+0.0pp
FR0.0%-0.0pp
TW0.0%
GB0.0%+0.0pp
Top 5: 16.9% · Top 10: 30.1% · Top 25: 56.5%

Winners

TickerPrev $PnLYoY %
MPWR$93M+0.08B89.6%
VMC$215M+0.04B17.5%
AMZN$195M+0.02B9.5%
FAST$169M+0.02B22.1%
ECL$211M+0.01B6.0%

Losers

TickerPrev $PnLYoY %
VEEV$166M-0.04B-24.2%
TYL$58M-0.02B-41.1%
TDG$232M-0.02B-10.5%
MCO$203M-0.01B-5.6%
DHR$117M-0.01B-7.1%

Top buys this quarter · 15

APH Amphenol Corporation+$23M
MSI Motorola Solutions, Inc.+$16M
VSEC VSE Corporationnew+$14M
PDFS PDF Solutions, Inc.new+$12M
SYK Stryker Corporation+$10M
RMBS Rambus Inc.new+$9M
BMI Badger Meter, Inc.+$4M
LB LandBridge Company LLC+$4M
WING Wingstop Inc.new+$4M
FSS Federal Signal Corporation+$1M

Top sells this quarter · 15

VMC Vulcan Materials Company$54M
ECL Ecolab Inc.$51M
WST West Pharmaceutical Services, $50M
MPWR Monolithic Power Systems, Inc.$42M
TMO Thermo Fisher Scientific Inc.$42M
INTU Intuit Inc.$36M
TDG TransDigm Group Incorporated$31M
ODFL Old Dominion Freight Line, Inc$28M
MASI Masimo Corporationexit$25M
MCO Moody's Corporation$25M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$5.22B262-3.21%+17.59%-20.80%-1.10B
2025-12-31$6.95B263+1.32%+17.72%-16.40%-0.56B
2025-09-30$7.74B272+2.49%+17.52%-15.03%-0.31B
2025-06-30$7.88B251+7.01%+14.94%-7.93%-0.16B
2025-03-31$7.49B260-4.97%+8.30%-13.27%-0.04B
2024-12-31$7.90B248+10.95%+24.89%-13.94%-0.17B
2024-09-30$8.22B261+27.67%+36.04%-8.37%-0.03B
2024-06-30$7.74B244+12.18%+24.49%-12.31%-0.07B
2024-03-31$8.19B265+25.65%+29.62%-3.97%-0.20B
2023-12-31$7.55B250+20.59%+26.18%-5.59%-0.16B
2023-09-30$6.83B255+14.12%+21.57%-7.45%-0.09B
2023-06-30$7.39B256+14.78%+19.42%-4.64%-0.18B
2023-03-31$7.09B238-11.28%-7.82%-3.46%-0.05B
2022-12-31$6.69B239-20.76%-18.17%-2.59%-0.23B
2022-09-30$6.47B243-17.64%-15.51%-2.14%-0.21B
2022-06-30$7.09B233+1.31%-10.62%+11.93%-0.07B