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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
ALPHABET INC CAP STK CL A 02079K305   46,621,350 148,950 SH   SOLE   148,950 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108   1,509,600 2 SH   SOLE   2 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702   20,834,843 41,450 SH   SOLE   41,450 0 0
CHAIN BRIDGE BANCORP INC CL A 15746L100   10,169,092 293,565 SH   SOLE   293,565 0 0
HEICO CORP NEW CL A 422806208   2,776,730 11,000 SH   SOLE   11,000 0 0
MASTERCARD INCORPORATED CL A 57636Q104   9,647,872 16,900 SH   SOLE   16,900 0 0
MOODYS CORP COM 615369105   1,277,125 2,500 SH   SOLE   2,500 0 0
PROGRESSIVE CORP COM 743315103   1,480,180 6,500 SH   SOLE   6,500 0 0
RLI CORP COM 749607107   1,919,400 30,000 SH   SOLE   30,000 0 0
S&P GLOBAL INC COM 78409V104   4,964,605 9,500 SH   SOLE   9,500 0 0
VISA INC COM CL A 92826C839   20,744,497 59,150 SH   SOLE   59,150 0 0