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DF DENT & CO INC — 13F Holdings & Portfolio

CIK 934999 · latest 13F-HR filed 2026-08-14

Backtest portfolio

DF DENT & CO INC manages $5.27B in 13F-reported U.S. long-equity assets across 271 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are GOOG (4.55%), V (3.61%), HEI.A (3.42%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 18 new positions, exited 9, added to 127, and trimmed 82.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Filer Information
Address
400 EAST PRATT STREET
7TH FLOOR
BALTIMORE, MD 21202
Phone
(410) 837-2544
Filing Manager
DF DENT & CO INC
BALTIMORE, MD
Signatory
Carolyn Gaynor
Chief Compliance Officer
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AUM

$5.27B

Long-equity book

Holdings

271

Distinct positions

Period

2026-06-30

Filed 2026-08-14

Q/Q Activity

+18 / −9 / ↑127 / ↓82

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • TAIWAN SEMICONDUCTOR MFG LTD A$50.4M +15447.7%
  • META PLATFORMS INC CL A$27.1M +1233.2%
  • STRYKER CORP$26.9M +235.3%
  • ASML HOLDINGS N.V.$23.2M +29.1%
  • ALPHABET INC CL C$23.0M +10.6%
Show all 127 →

Top Trims

  • TYLER TECHNOLOGIES INC-$37.4M -64.4%
  • BIO-TECHNE CORP-$34.0M -31.9%
  • KINSALE CAPITAL GROUP INC.-$32.1M -37.7%
  • WEST PHARMACEUTICALS, INC.-$28.6M -94.6%
  • COSTAR GROUP INC-$27.4M -42.3%
Show all 82 →

New Positions

  • DATADOG INC CL A$62.3M
  • MEDLINE INC CL A$31.6M
  • INSULET CORP COM$21.0M
  • MERCURY SYS INC$13.9M
  • PRIMORIS SVCS CORP$7.9M
Show all 18 →

Exited Positions

  • OLD DOMINION FGHT LINES INC CO$32.9M
  • UTZ BRANDS INC.$10.5M
  • SYNOPSYS INC$10.5M
  • HONEYWELL INTL INC$892.4K
  • COMCAST CORP NEW CL A$476.1K
Show all 9 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ALPHABET INC CL C GOOG 02079K107 $240.1M 4.55% 679,481 SH
2 VISA INC CL A V 92826C839 $190.1M 3.61% 554,092 SH
3 HEICO CORP CL A HEI.A 422806208 $180.3M 3.42% 699,176 SH
4 AMAZON.COM INC AMZN 023135106 $165.1M 3.13% 692,739 SH
5 TRANSDIGM GROUP INC TDG 893641100 $149.1M 2.83% 111,941 SH
6 VULCAN MATERIALS CO VMC 929160109 $144.6M 2.74% 490,212 SH
7 ECOLAB INC ECL 278865100 $130.3M 2.47% 467,771 SH
8 WASTE CONNECTIONS INC WCN 94106B101 $128.3M 2.43% 769,572 SH
9 MASTERCARD INC CL A MA 57636Q104 $126.6M 2.40% 246,504 SH
10 FASTENAL CO FAST 311900104 $123.8M 2.35% 2,577,410 SH
11 MOODYS CORP MCO 615369105 $122.0M 2.31% 269,427 SH
12 PERIMETER SOLUTIONS INC PRM 71385M107 $118.5M 2.25% 3,322,708 SH
13 ASML HOLDINGS N.V. ASML N07059210 $103.1M 1.96% 51,824 SH
14 MONOLITHIC PWR SYS INC COM MPWR 609839105 $100.8M 1.91% 72,954 SH
15 INTUITIVE SURGICAL INC ISRG 46120E602 $99.6M 1.89% 250,449 SH
16 CADENCE DESIGN SYSTEMS INC. CDNS 127387108 $97.3M 1.85% 259,282 SH
17 MICROSOFT CORP MSFT 594918104 $97.2M 1.84% 260,499 SH
18 GUIDEWIRE SOFTWARE INC GWRE 40171V100 $89.4M 1.70% 726,645 SH
19 CBRE GROUP INC CBRE 12504L109 $80.2M 1.52% 595,199 SH
20 BIO-TECHNE CORP TECH 09073M104 $72.8M 1.38% 1,029,772 SH
21 DANAHER CORP DHR 235851102 $70.3M 1.33% 368,898 SH
22 BROADCOM INC AVGO 11135F101 $64.9M 1.23% 171,833 SH
23 MOTOROLA SOLUTIONS INC. MSI 620076307 $64.8M 1.23% 156,051 SH
24 DATADOG INC CL A DDOG 23804L103 $62.3M 1.18% 239,350 SH
25 VEEVA SYSTEMS, INC. VEEV 922475108 $59.3M 1.13% 334,373 SH
26 MSCI INC COM MSCI 55354G100 $58.1M 1.10% 103,680 SH
27 APPLE INC AAPL 037833100 $57.2M 1.08% 197,541 SH
28 NOVANTA INC COM NPV NOVT 67000B104 $53.9M 1.02% 332,049 SH
29 KINSALE CAPITAL GROUP INC. KNSL 49714P108 $53.0M 1.00% 160,589 SH
30 APPFOLIO, INC APPF 03783C100 $51.1M 0.97% 318,951 SH
31 MEDPACE HOLDINGS, INC. MEDP 58506Q109 $51.1M 0.97% 96,455 SH
32 TAIWAN SEMICONDUCTOR MFG LTD A TSM 874039100 $50.8M 0.96% 106,282 SH
33 REPLIGEN CORPORATION RGEN 759916109 $48.7M 0.92% 356,854 SH
34 MARKEL GROUP INC MKL 570535104 $46.9M 0.89% 24,038 SH
35 LANDBRIDGE COMPANY LLC CL A LB 514952100 $45.0M 0.85% 567,536 SH
36 FLOOR & DECOR HOLDINGS, INC. FND 339750101 $44.5M 0.85% 750,501 SH
37 CASELLA WASTE SYSTEMS INC CL A CWST 147448104 $43.3M 0.82% 446,270 SH
38 O REILLY AUTOMOTIVE ORLY 67103H107 $43.1M 0.82% 467,562 SH
39 S & P GLOBAL INC SPGI 78409V104 $39.9M 0.76% 98,000 SH
40 AMPHENOL CORP NEW CL A APH 032095101 $39.9M 0.76% 226,067 SH
41 UBER TECHNOLOGIES, INC. UBER 90353T100 $39.3M 0.75% 545,122 SH
42 STRYKER CORP SYK 863667101 $38.4M 0.73% 121,896 SH
43 HAYWARD HOLDINGS INC HAYW 421298100 $38.0M 0.72% 2,192,729 SH
44 GOOSEHEAD INSURANCE, INC. GSHD 38267D109 $37.6M 0.71% 775,412 SH
45 HAMILTON LANE INC HLNE 407497106 $37.5M 0.71% 476,169 SH
46 COSTAR GROUP INC CSGP 22160N109 $37.4M 0.71% 1,319,009 SH
47 CROWDSTRIKE HOLDINGS, INC. CRWD 22788C105 $37.1M 0.70% 48,630 SH
48 VERALTO CORP VLTO 92338C103 $37.1M 0.70% 417,939 SH
49 RBC BEARINGS INC RBC 75524B104 $36.2M 0.69% 56,282 SH
50 ONTO INNOVATION INC ONTO 683344105 $35.5M 0.67% 93,905 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $5.27B 271 0000934999-26-000003
2026-03-31 2026-05-15 $5.22B 262 0000934999-26-000002
2025-12-31 2026-02-17 $6.95B 263 0000934999-26-000001
2025-09-30 2025-11-14 $7.74B 272 0000934999-25-000008