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Institutional Investment Manager
DF DENT & CO INC
DF DENT & CO INC (CIK: 0000934999) incorporated in Maryland, located at 400 East Pratt Street, Baltimore, MD. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q2)
Portfolio Summary: 178 holdings with a total value of $3,561,948,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 LKQ CORP 5,083,128 161,135,000 4.52%
2 ANSYS INC 1,766,005 160,265,000 4.50%
3 RED HAT INC 1,925,925 139,822,000 3.93%
4 SEI INVESTMENTS CO 2,615,074 125,811,000 3.53%
5 ECOLAB INC 1,044,383 123,864,000 3.48%
6 WAGEWORKS INC COM 2,068,905 123,741,000 3.47%
7 ROPER TECHNOLOGIES INC 713,781 121,743,000 3.42%
8 VISA INC CL A COMMON STOCK 1,558,541 115,597,000 3.25%
9 CARMAX 2,229,354 109,305,000 3.07%
10 MOODYS CORP 1,156,833 108,407,000 3.04%
11 Verisk Analytics Inc 1,311,669 106,350,000 2.99%
12 Intuitive Surgical Inc 154,073 101,905,000 2.86%
13 TYLER TECHNOLOGIES INC 587,270 97,904,000 2.75%
14 MARKEL CORP 101,929 97,116,000 2.73%
15 IMAX CORP 3,225,399 95,085,000 2.67%
16 COSTAR GROUP INC 429,243 93,858,000 2.64%
17 STERICYCLE 894,674 93,153,000 2.62%
18 AMERICAN TOWER CORP REIT 804,050 91,348,000 2.56%
19 FASTENAL CO 1,931,164 85,724,000 2.41%
20 HEALTHCARE SVCS GROUP INC COM 1,997,094 82,640,000 2.32%
21 ALPHABET INC 110,581 76,533,000 2.15%
22 TRANSDIGM GROUP INC COM 287,202 75,732,000 2.13%
23 S&P GLOBAL INC 686,609 73,646,000 2.07%
24 Signet Jewelers Ltd. 869,923 71,690,000 2.01%
25 TRIMBLE INC 2,920,599 71,146,000 2.00%
26 Blackbaud Inc 1,037,947 70,477,000 1.98%
27 WASTE CONNECTIONS INC 959,310 69,118,000 1.94%
28 CELGENE CORP 642,679 63,387,000 1.78%
29 ENVESTNET INC 1,886,655 62,844,000 1.76%
30 DISCOVER FINANCIAL 1,154,451 61,867,000 1.74%
31 ILLUMINA INC 392,859 55,150,000 1.55%
32 MASTERCARD INCORPORATED 569,077 50,113,000 1.41%
33 QUALCOMM INC 700,104 37,505,000 1.05%
34 PRA GROUP INC. 1,490,576 35,983,000 1.01%
35 EXPONENT INC 580,502 33,907,000 0.95%
36 WABTEC 435,135 30,560,000 0.86%
37 AAC HLDGS INC COM 1,058,698 24,159,000 0.68%
38 BIO-TECHNE CORPORATION 212,735 23,990,000 0.67%
39 BIOGEN INC 87,982 21,276,000 0.60%
40 CHIPOTLE MEXICAN GRILL INC 50,951 20,521,000 0.58%
41 O'Reilly Automotive Inc 68,986 18,702,000 0.53%
42 PROCTER AND GAMBLE CO 219,533 18,588,000 0.52%
43 FINANCIAL ENGINES INC 648,539 16,778,000 0.47%
44 SBA COMMUN 135,536 14,630,000 0.41%
45 PROS HOLDINGS INC 837,786 14,603,000 0.41%
46 SCHLUMBERGER LTD 168,779 13,347,000 0.37%
47 INTEL CORP 378,606 12,418,000 0.35%
48 T Rowe Price Group Inc 160,914 11,742,000 0.33%
49 JOHNSON & JOHNSON 95,540 11,589,000 0.33%
50 IDEXX LABS INC COM 123,634 11,481,000 0.32%
Page 1 of 4

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000934999-16-000024, filed 2016.08.12).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.