The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number: 3235-0006
Estimated average burden
hours per response: 23.8
COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP FIGI (to the nearest dollar) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
AMETEK INC COM 031100100   123,772,328 686,632 SH   SOLE   614,336 72,000 296
AMPHENOL CORP NEW CL A 032095101   97,401,420 1,402,468 SH   SOLE   1,264,807 136,871 790
ARCH CAP GROUP LTD ORD G0450A105   33,689,742 364,805 SH   SOLE   290,669 74,015 121
BERKLEY W R CORP COM 084423102   58,824,024 1,005,195 SH   SOLE   898,320 106,500 375
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702   317,296 700 SH   SOLE   700 0 0
CANADIAN PACIFIC KANSAS CITY COM 13646K108   86,801,562 1,199,414 SH   SOLE   1,053,121 145,743 550
COPART INC COM 217204106   61,000,634 1,062,914 SH   SOLE   956,973 105,000 941
GRACO INC COM 384109104   50,128,374 594,713 SH   SOLE   525,359 69,086 268
HEICO CORP NEW CL A 422806208   97,723,072 525,167 SH   SOLE   524,867 0 300
HINGHAM INSTN SVGS MASS COM 433323102   42,626,990 167,730 SH   SOLE   150,360 17,250 120
IDEX CORP COM 45167R104   51,928,153 248,116 SH   SOLE   217,708 30,283 125
KINSALE CAP GROUP INC COM 49714P108   70,187,890 150,900 SH   SOLE   133,352 17,500 48
LINDE PLC SHS G54950103   92,662,648 221,326 SH   SOLE   194,655 26,571 100
MASTERCARD INCORPORATED CL A 57636Q104   1,097,898 2,085 SH   SOLE   2,085 0 0
MICROSOFT CORP COM 594918104   1,025,931 2,434 SH   SOLE   2,434 0 0
OREILLY AUTOMOTIVE INC COM 67103H107   1,826,132 1,540 SH   SOLE   1,540 0 0
PROGRESSIVE CORP COM 743315103   3,222,755 13,450 SH   SOLE   13,450 0 0
RBC BEARINGS INC COM 75524B104   120,793,629 403,803 SH   SOLE   360,650 42,969 184
RLI CORP COM 749607107   115,480,328 700,603 SH   SOLE   625,278 75,000 325
SIMPSON MFG INC COM 829073105   47,701,296 287,652 SH   SOLE   247,139 40,400 113
SPDR S&P MIDCAP 400 ETF TR UTSER1 S&PDCRP 78467Y107   549,075 964 SH   SOLE   964 0 0
TELEDYNE TECHNOLOGIES INC COM 879360105   132,074,689 284,564 SH   SOLE   256,429 28,000 135
THERMO FISHER SCIENTIFIC INC COM 883556102   1,541,962 2,964 SH   SOLE   2,964 0 0
VISA INC COM CL A 92826C839   1,059,366 3,352 SH   SOLE   3,352 0 0
WILLSCOT HLDGS CORP COM CL A 971378104   15,476,445 462,674 SH   SOLE   402,543 60,000 131