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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 (2015Q2)
Portfolio Summary: 200 holdings with a total value of $3,700,922,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ANSYS 1,925,529 175,685,000 4.75%
2 SEI INVESTMENTS CO 3,367,710 165,119,000 4.46%
3 LKQ CORP 5,249,692 158,777,000 4.29%
4 RED HAT INC 1,942,728 147,511,000 3.99%
5 MARKEL CORP 161,457 129,275,000 3.49%
6 MOODYS CORP 1,158,190 125,038,000 3.38%
7 FASTENAL CO 2,811,434 118,586,000 3.20%
8 VISA INC 1,693,087 113,691,000 3.07%
9 ECOLAB INC 1,003,663 113,484,000 3.07%
10 PRA GROUP INC 1,708,934 106,484,000 2.88%
11 SIGNET JEWELERS LIMITED SHS 827,105 106,068,000 2.87%
12 CELGENE CORP 913,215 105,691,000 2.86%
13 STERICYCLE 788,751 105,622,000 2.85%
14 IMAX CORP COM 2,602,704 104,811,000 2.83%
15 VERISK ANALYTICS INC 1,415,036 102,958,000 2.78%
16 ROPER TECHNOLOGIES INC 554,805 95,682,000 2.59%
17 DISCOVER FINANCIAL 1,615,553 93,088,000 2.52%
18 QUALCOMM INC 1,428,603 89,473,000 2.42%
19 WAGEWORKS INC COM 2,187,252 88,474,000 2.39%
20 CARMAX 1,294,385 85,701,000 2.32%
21 HEALTHCARE SVCS GROUP INC COM 2,477,506 81,882,000 2.21%
22 COSTAR GROUP 401,739 80,854,000 2.18%
23 INTUITIVE SURGICAL INC 161,055 78,031,000 2.11%
24 AMERICAN TOWER CORP NEW 830,490 77,476,000 2.09%
25 WASTE CONNECTIONS INC COM 1,613,179 76,013,000 2.05%
26 TRIMBLE INC 3,015,619 70,746,000 1.91%
27 EXAMWORKS GROUP INC 1,748,433 68,364,000 1.85%
28 FINANCIAL ENGINES INC 1,428,331 60,675,000 1.64%
29 BIOGEN INC 147,364 59,526,000 1.61%
30 TYLER TECHNOLOGIES INC 415,373 53,741,000 1.45%
31 S&P GLOBAL INC 475,478 47,762,000 1.29%
32 MASTERCARD INCORPORATED 491,870 45,980,000 1.24%
33 CHIPOTLE MEXICAN GRILL INC 74,563 45,110,000 1.22%
34 TANGOE INC COM 3,462,387 43,557,000 1.18%
35 BLACKBAUD INC COM 694,469 39,550,000 1.07%
36 EXPONENT INC COM 800,474 35,845,000 0.97%
37 POTASH CORP SASK INC 736,583 22,812,000 0.62%
38 SCHLUMBERGER LTD 259,701 22,384,000 0.60%
39 ILLUMINA INC 99,554 21,739,000 0.59%
40 PROCTER AND GAMBLE CO 251,239 19,657,000 0.53%
41 O REILLY AUTOMOTIVE INC NEW 85,611 19,346,000 0.52%
42 RANGE RES CORP 374,279 18,482,000 0.50%
43 BIO TECHNE CORP 161,413 15,894,000 0.43%
44 TRANSDIGM GROUP INC COM 69,981 15,723,000 0.42%
45 INTEL CORP 440,979 13,412,000 0.36%
46 PRICE T ROWE GROUP INC 172,275 13,391,000 0.36%
47 AAC HLDGS INC COM 296,773 12,927,000 0.35%
48 3-D SYS CORP DEL 588,455 11,487,000 0.31%
49 JOHNSON & JOHNSON 105,726 10,304,000 0.28%
50 QUALYS INC 235,387 9,498,000 0.26%
Page 1 of 4

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000934999-15-000012, filed 2015.08.13).

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.