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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 and exited 9; 127 existing positions rose in reported value and 82 fell.

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.

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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

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
GOOG4.6% · -10%V3.6% · -10%HEI.A3.4% · -10%AMZN3.1% · -13%TDG2.8% · -9%VMC2.7% · -10%ECL2.5% · -10%WCN2.4% · -10%MA2.4% · -14%FAST2.3% · -3%MCO2.3% · -9%PRM2.2% · -16%ASML2.0% · -14%MPWR1.9% · -18%ISRG1.9% · -9%CDNS1.8% · -10%MSFT1.8% · -11%GWRE1.7% · +18%CBRE1.5% · -10%TECH1.4% · -50%DHR1.3% · -14%AVGO1.2% · -12%MSI1.2% · +22%DDOG1.2% · newVEEV1.1% · -28%MSCI1.1% · -15%AAPL1.1% · -16%NOVT1.0% · -14%KNSL1.0% · -36%APPF1.0% · -0%MEDP1.0% · +29%TSM1.0% · +10902%RGEN0.9% · -2%MKL0.9% · -9%LB0.9% · +14%FND0.8% · +18%CWST0.8% · +36%ORLY0.8% · -1%SPGI0.8% · -36%APH0.8% · +6%UBER0.7% · -28%SYK0.7% · +250%HAYW0.7% · +2%GSHD0.7% · -1%HLNE0.7% · +204%CSGP0.7% · -18%CRWD0.7% · -13%VLTO0.7% · -21%RBC0.7% · -23%ONTO0.7% · +0%NFLX0.7% · -8%QCOM0.6% · -13%MDLN0.6% · newAIT0.6% · +1%META0.6% · +1254%FSS0.5% · +1%MTD0.5% · +8%CSW0.5% · +0%PCOR0.5% · -24%MANH0.5% · -52%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 29.9%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Jun 18, 2026.

Assets Under Management
$7.88B
Discretionary
$7.88B
Employees
31
Accounts
1,171
Address
400 EAST PRATT STREET, 7TH FLOOR
BALTIMORE, MD 21202-3127
Phone
(410) 837-2544
Website
Name Title / Status Ownership Type
DENT, DANIEL, FORBES ControlCHAIRMAN
since Jan 1976
25–50%Individual
DENT, MATTHEW, FORBES ControlPRESIDENT
since Jan 2014
25–50%Individual
GAYNOR, CAROLYN, ELIZABETH ControlCHIEF COMPLIANCE OFFICER
since Jan 2019
Less than 5%Individual
HRIMNAK, BROOKE, ELIZABETH ControlCHIEF OPERATING OFFICER
since Aug 2021
Less than 5%Individual
MORRILL, MICHAEL, NORRIS ControlHEAD OF CLIENT RELATIONS AND MARKETING
since Aug 2021
5–10%Individual
O'NEIL, THOMAS, FRANCIS ControlPORTFOLIO MANAGER, TRUSTEE
since Jun 1985
Less than 5%Individual
CURRY, MELISSASHAREHOLDER
since Feb 2025
10–25%Individual
DENT, TIMOTHYSHAREHOLDER
since Feb 2025
10–25%Individual
EKLUND, ASHLEYSHAREHOLDER
since Feb 2025
10–25%Individual
WU, GARY, GUANGYUCHIEF RISK OFFICER
since Sep 2013
Less than 5%Individual
Ownership & leadership changes · 16 filings with changes since Mar 27, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Mar 30, 2026 filing
  • ChangedDENT, DANIEL, FORBES · ownership 10–25% → 25–50%
Aug 6, 2025 filing
  • No longer listedMITCHELL, GARY, DAVID · PORTFOLIO MANAGER & ANALYST · 5–10% · listed since Sep 2007
  • ChangedCURRY, MELISSA · ownership 5–10% → 10–25%
  • ChangedDENT, TIMOTHY · ownership 5–10% → 10–25%
  • ChangedEKLUND, ASHLEY · ownership 5–10% → 10–25%
Mar 31, 2025 filing
  • No longer listedDANIEL F. DENT 2003 NON EXEMPT TRUST · TRUST · 25–50% · control person · listed since Dec 2003
  • No longer listedDENT, MARY, DECKER · TRUSTEE · 25–50% · control person · listed since Dec 2003
  • AddedCURRY, MELISSA · SHAREHOLDER · 5–10%
  • AddedDENT, TIMOTHY · SHAREHOLDER · 5–10%
  • AddedEKLUND, ASHLEY · SHAREHOLDER · 5–10%
  • ChangedDENT, MATTHEW, FORBES · ownership 10–25% → 25–50%
  • ChangedO'NEIL, THOMAS, FRANCIS · ownership 25–50% → Less than 5%
Mar 26, 2024 filing
  • ChangedDENT, DANIEL, FORBES · ownership 25–50% → 10–25%
Mar 31, 2023 filing
  • Listed againMORRILL, MICHAEL, NORRIS · HEAD OF CLIENT RELATIONS AND MARKETING · 5–10% · control person
  • ChangedGAYNOR, CAROLYN, ELIZABETH · now a control person
  • ChangedHRIMNAK, BROOKE, ELIZABETH · now a control person
Apr 1, 2022 filing
  • No longer listedKENNEDY, BRUCE, LEE · VICE PRESIDENT · Less than 5% · listed since Dec 2010
  • No longer listedMORRILL, MICHAEL, NORRIS · CHIEF OPERATING OFFICER · Less than 5% · listed since Jan 2015
  • AddedHRIMNAK, BROOKE, ELIZABETH · CHIEF OPERATING OFFICER · Less than 5%
  • ChangedMITCHELL, GARY, DAVID · title VICE PRESIDENT → PORTFOLIO MANAGER & ANALYST
  • ChangedO'NEIL, THOMAS, FRANCIS · title VICE PRESIDENT, TRUSTEE → PORTFOLIO MANAGER, TRUSTEE
Mar 31, 2021 filing
  • No longer listedMCCLEARY, LINDA, WATSON · VICE PRESIDENT · Less than 5% · listed since Jan 1999
  • No longer listedMCGURKIN, TIMOTHY, OWEN · SENIOR RELATIONSHIP MANAGER · Less than 5% · listed since Jan 2019
  • No longer listedWATSON, PETE, THOMAS PAYNE · ANALYST · Less than 5% · listed since Jan 2019
  • ChangedMORRILL, MICHAEL, NORRIS · title VICE PRESIDENT → CHIEF OPERATING OFFICER
  • ChangedWU, GARY, GUANGYU · title VICE PRESIDENT → CHIEF RISK OFFICER
Mar 30, 2020 filing
  • AddedMCGURKIN, TIMOTHY, OWEN · SENIOR RELATIONSHIP MANAGER · Less than 5%
  • AddedWATSON, PETE, THOMAS PAYNE · ANALYST · Less than 5%
Mar 28, 2019 filing
  • AddedGAYNOR, CAROLYN, ELIZABETH · CHIEF COMPLIANCE OFFICER · Less than 5%
  • ChangedMITCHELL, GARY, DAVID · title CHIEF COMPLIANCE OFFICER, VICE PRESIDENT → VICE PRESIDENT
Jan 4, 2019 filing
  • No longer listedDANIEL F. DENT 2003 IRREVOCABLE TRUST · TRUST · 25–50% · control person · listed since Dec 2003
  • AddedDANIEL F. DENT 2003 NON EXEMPT TRUST · TRUST · 25–50% · control person
Older changes (7 more filings)
Mar 30, 2018 filing
  • No longer listedROOT, AUSTIN, GREGORY · VICE PRESIDENT · Less than 5% · listed since Dec 2014
Jul 8, 2016 filing
  • No longer listedDANIEL F DENT 2011 GRANTOR RETAINED ANNUITY TRUST · TRUST · 5–10% · listed since Dec 2003
  • No longer listedDANIEL F. DENT 2010 GRANTOR RETAINED ANNUITY TRUST · TRUST · 5–10% · listed since Dec 2003
  • ChangedDANIEL F. DENT 2003 IRREVOCABLE TRUST · ownership 10–25% → 25–50%; now a control person
  • ChangedDENT, MARY, DECKER · now a control person
  • ChangedO'NEIL, THOMAS, FRANCIS · ownership 10–25% → 25–50%
Mar 23, 2016 filing
  • AddedDENT, MARY, DECKER · TRUSTEE · 25–50%
  • ChangedO'NEIL, THOMAS, FRANCIS · title VICE PRESIDENT → VICE PRESIDENT, TRUSTEE; ownership Less than 5% → 10–25%
Mar 15, 2016 filing
  • No longer listedDANIEL F. DENT 2003 GRANTOR RETAINED ANNUITY TRUST, MARY D. DENT, TRUSTEE · TRUST · 10–25% · listed since Dec 2003
  • AddedDANIEL F DENT 2011 GRANTOR RETAINED ANNUITY TRUST · TRUST · 5–10%
  • AddedDANIEL F. DENT 2003 IRREVOCABLE TRUST · TRUST · 10–25%
  • AddedDANIEL F. DENT 2010 GRANTOR RETAINED ANNUITY TRUST · TRUST · 5–10%
  • ChangedDENT, DANIEL, FORBES · ownership 50–75% → 25–50%
  • ChangedMITCHELL, GARY, DAVID · ownership Less than 5% → 5–10%
Mar 24, 2015 filing
  • AddedROOT, AUSTIN, GREGORY · VICE PRESIDENT · Less than 5%
  • ChangedDENT, DANIEL, FORBES · title PRESIDENT → CHAIRMAN
  • ChangedDENT, MATTHEW, FORBES · title VICE PRESIDENT → PRESIDENT
  • ChangedWU, GARY, GUANGYU · title PORTFOLIO MANAGER, ANALYST → VICE PRESIDENT
Mar 11, 2014 filing
  • AddedWU, GARY, GUANGYU · PORTFOLIO MANAGER, ANALYST · Less than 5%
  • ChangedDENT, MATTHEW, FORBES · now a control person
Mar 27, 2012 filing (earliest on record)
  • ListedDANIEL F. DENT 2003 GRANTOR RETAINED ANNUITY TRUST, MARY D. DENT, TRUSTEE · TRUST · 10–25%
  • ListedDENT, DANIEL, FORBES · PRESIDENT · 50–75% · control person
  • ListedDENT, MATTHEW, FORBES · VICE PRESIDENT · 10–25%
  • ListedKENNEDY, BRUCE, LEE · VICE PRESIDENT · Less than 5%
  • ListedMCCLEARY, LINDA, WATSON · VICE PRESIDENT · Less than 5%
  • ListedMITCHELL, GARY, DAVID · CHIEF COMPLIANCE OFFICER, VICE PRESIDENT · Less than 5%
  • ListedMORRILL, MICHAEL, NORRIS · VICE PRESIDENT · Less than 5%
  • ListedO'NEIL, THOMAS, FRANCIS · VICE PRESIDENT · Less than 5% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

DF DENT & CO INC Holdings (2026-06-30)

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
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