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
INTL GNRL INSURANCE HLDNGS L SHS G4809J106   1,342,065 55,400 SH   SOLE   55,400 0 0
ALPHABET INC CAP STK CL A 02079K305   34,349,042 119,450 SH   SOLE   119,450 0 0
AMPHENOL CORP CL A 032095101   884,450 7,000 SH   SOLE   7,000 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108   1,436,280 2 SH   SOLE   2 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702   19,862,840 41,450 SH   SOLE   41,450 0 0
CAPITAL BANCORP INC MD COM 139737100   580,049 19,504 SH   SOLE   19,504 0 0
CHAIN BRIDGE BANCORP INC CL A 15746L100   10,770,559 308,612 SH   SOLE   308,612 0 0
HEICO CORP NEW CL A 422806208   3,482,985 16,500 SH   SOLE   16,500 0 0
KINSALE CAP GROUP INC COM 49714P108   1,366,640 4,000 SH   SOLE   4,000 0 0
MASTERCARD INCORPORATED CL A 57636Q104   9,043,846 18,100 SH   SOLE   18,100 0 0
MOODYS CORP COM 615369105   1,963,125 4,500 SH   SOLE   4,500 0 0
PROGRESSIVE CORP COM 743315103   1,288,560 6,500 SH   SOLE   6,500 0 0
RLI CORP COM 749607107   1,996,400 35,000 SH   SOLE   35,000 0 0
S&P GLOBAL INC COM 78409V104   5,104,080 12,000 SH   SOLE   12,000 0 0
VISA INC COM CL A 92826C839   19,690,936 65,150 SH   SOLE   65,150 0 0