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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 (2015Q4)
Portfolio Summary: 169 holdings with a total value of $3,565,740,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ANSYS 1,848,745 171,009,000 4.80%
2 RED HAT INC 1,898,448 157,210,000 4.41%
3 LKQ CORP 5,221,053 154,700,000 4.34%
4 SEI INVESTMENTS CO 2,633,959 138,019,000 3.87%
5 VISA INC 1,720,019 133,387,000 3.74%
6 MOODYS CORP 1,303,985 130,842,000 3.67%
7 ECOLAB INC 1,047,236 119,783,000 3.36%
8 IMAX CORP COM 3,323,595 118,121,000 3.31%
9 STERICYCLE 930,638 112,235,000 3.15%
10 MARKEL CORP 121,059 106,937,000 3.00%
11 ROPER TECHNOLOGIES INC 558,145 105,930,000 2.97%
12 FASTENAL CO 2,591,876 105,800,000 2.97%
13 INTUITIVE SURGICAL INC 186,709 101,973,000 2.86%
14 VERISK ANALYTICS INC 1,313,719 100,999,000 2.83%
15 WAGEWORKS INC COM 2,171,589 98,525,000 2.76%
16 CARMAX 1,817,442 98,087,000 2.75%
17 SIGNET JEWELERS LIMITED SHS 711,819 88,045,000 2.47%
18 WASTE CONNECTIONS INC COM 1,532,044 86,285,000 2.42%
19 COSTAR GROUP 399,075 82,485,000 2.31%
20 AMERICAN TOWER CORP NEW 838,260 81,269,000 2.28%
21 CELGENE CORP 646,609 77,438,000 2.17%
22 ALPHABET INC 98,916 75,065,000 2.11%
23 DISCOVER FINANCIAL 1,377,294 73,851,000 2.07%
24 HEALTHCARE SVCS GROUP INC COM 2,023,170 70,548,000 1.98%
25 S&P GLOBAL INC 687,411 67,765,000 1.90%
26 TRIMBLE INC 3,124,266 67,016,000 1.88%
27 TRANSDIGM GROUP INC COM 278,013 63,512,000 1.78%
28 PRA GROUP INC 1,738,730 60,317,000 1.69%
29 MASTERCARD INCORPORATED 600,929 58,506,000 1.64%
30 EXAMWORKS GROUP INC 2,176,609 57,898,000 1.62%
31 ENVESTNET INC 1,898,641 56,674,000 1.59%
32 BLACKBAUD INC COM 695,302 45,793,000 1.28%
33 TYLER TECHNOLOGIES INC 249,829 43,550,000 1.22%
34 QUALCOMM INC 730,826 36,530,000 1.02%
35 BIOGEN INC 116,729 35,760,000 1.00%
36 EXPONENT INC COM 646,158 32,276,000 0.91%
37 FINANCIAL ENGINES INC 916,856 30,871,000 0.87%
38 CHIPOTLE MEXICAN GRILL INC 42,203 20,251,000 0.57%
39 PROCTER AND GAMBLE CO 230,107 18,273,000 0.51%
40 O REILLY AUTOMOTIVE INC NEW 72,032 18,254,000 0.51%
41 BIO TECHNE CORP 202,505 18,225,000 0.51%
42 ILLUMINA INC 90,023 17,279,000 0.48%
43 AAC HLDGS INC COM 868,785 16,559,000 0.46%
44 SCHLUMBERGER LTD 206,855 14,428,000 0.40%
45 INTEL CORP 396,399 13,656,000 0.38%
46 PRICE T ROWE GROUP INC 162,029 11,583,000 0.32%
47 RANGE RES CORP 436,983 10,754,000 0.30%
48 JOHNSON & JOHNSON 99,670 10,238,000 0.29%
49 POTASH CORP SASK INC 524,319 8,976,000 0.25%
50 IDEXX LAB 120,278 8,771,000 0.25%
Page 1 of 4

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000934999-16-000018, filed 2016.02.12).

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.