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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 (2017Q1)
Portfolio Summary: 172 holdings with a total value of $3,538,177,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ROPER TECHNOLOGIES INC 821,408 169,613,000 4.79%
2 RED HAT INC 1,803,495 156,002,000 4.41%
3 ECOLAB INC 1,145,281 143,550,000 4.06%
4 ANSYS INC 1,314,099 140,438,000 3.97%
5 VISA INC 1,446,443 128,545,000 3.63%
6 SEI INVESTMENTS CO 2,436,564 122,900,000 3.47%
7 INTUITIVE SURGICAL INC 153,376 117,558,000 3.32%
8 MOODYS CORP 1,030,031 115,405,000 3.26%
9 CELGENE CORP 894,174 111,262,000 3.14%
10 LKQ CORP 3,761,714 110,105,000 3.11%
11 VERISK ANALYTICS INC 1,210,605 98,228,000 2.78%
12 WAGEWORKS 1,347,406 97,417,000 2.75%
13 IMAX CORP 2,829,790 96,213,000 2.72%
14 TYLER TECHNOLOGIES INC 612,286 94,635,000 2.67%
15 Markel Corp 95,634 93,325,000 2.64%
16 TRIMBLE INC 2,852,896 91,321,000 2.58%
17 WASTE CONNECTIONS INC 1,005,718 88,724,000 2.51%
18 CARMAX INC 1,467,534 86,907,000 2.46%
19 COSTAR GROUP INC 416,127 86,230,000 2.44%
20 WABTEC CORP 1,074,742 83,830,000 2.37%
21 AMERICAN TOWER CORP NEW 687,352 83,541,000 2.36%
22 ALPHABET INC 96,804 80,305,000 2.27%
23 S&P GLOBAL INC 564,676 73,826,000 2.09%
24 ILLUMINA INC 425,021 72,526,000 2.05%
25 HEALTHCARE SVCS GRP INC 1,555,585 67,030,000 1.89%
26 BLACKBAUD INC 872,770 66,915,000 1.89%
27 FASTENAL CO 1,288,138 66,339,000 1.87%
28 STERIS PLC 933,169 64,818,000 1.83%
29 MASTERCARD INCORPORATED 504,207 56,708,000 1.60%
30 PROS HOLDINGS IN 2,336,673 56,524,000 1.60%
31 AMAZON COM INC 60,502 53,637,000 1.52%
32 TRANSDIGM GROUP INC 238,225 52,448,000 1.48%
33 ENVESTNET INC. 1,508,842 48,736,000 1.38%
34 DISCOVER FINL SVCS 659,438 45,099,000 1.27%
35 BIO TECHNE CORP 407,197 41,392,000 1.17%
36 CBRE GROUP INC 851,448 29,622,000 0.84%
37 EXPONENT INC 494,285 29,435,000 0.83%
38 SBA COMMUNICATIONS CORP NEW 194,627 23,427,000 0.66%
39 QUALCOMM INC 398,015 22,822,000 0.65%
40 Stericycle 240,839 19,963,000 0.56%
41 IDEXX LABS INC 122,964 19,011,000 0.54%
42 PROCTER AND GAMBLE CO 202,671 18,210,000 0.51%
43 O REILLY AUTOMOTIVE INC NEW 60,324 16,278,000 0.46%
44 BLACKLINE 518,893 15,442,000 0.44%
45 INTEL CORP 336,591 12,141,000 0.34%
46 JOHNSON & JOHNSON 86,844 10,816,000 0.31%
47 PRICE T ROWE GROUP INC 155,420 10,592,000 0.30%
48 AAC HOLDINGS INC 1,050,507 8,961,000 0.25%
49 SCHLUMBERGER LTD 104,258 8,143,000 0.23%
50 FISERV INC 68,568 7,907,000 0.22%
Page 1 of 4

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000934999-17-000003, filed 2017.05.15).

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.