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 (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
ALPHABET INC CAP STK CL A 02079K305 44,456 21,554 SH   SOLE   21,554 0 0
ALPHABET INC CAP STK CL C 02079K107 44,457 21,491 SH   SOLE   21,491 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 9,479,061 37,104,399 SH   SOLE   37,104,399 0 0
CANADIAN NATL RY CO COM 136375102 1,612,967 13,907,283 SH   SOLE   13,907,283 0 0
CATERPILLAR INC COM 149123101 2,355,047 10,156,756 SH   SOLE   10,156,756 0 0
COCA-COLA FEMSA SAB DE CV SPONSORD ADR REP 191241108 287,120 6,214,719 SH   SOLE   6,214,719 0 0
COUPANG INC CL A 22266T109 282,000 5,714,285 SH   SOLE   5,714,285 0 0
CROWN CASTLE INTL CORP NEW COM 22822V101 875,570 5,086,680 SH   SOLE   5,086,680 0 0
ECOLAB INC COM 278865100 934,721 4,366,426 SH   SOLE   4,366,426 0 0
FEDEX CORP COM 31428X106 424,274 1,493,712 SH   SOLE   1,493,712 0 0
GRUPO TELEVISA SA SPON ADR REP ORD 40049J206 149,549 16,879,104 SH   SOLE   16,879,104 0 0
LIBERTY GLOBAL PLC SHS CL A G5480U104 9,771 380,772 SH   SOLE   380,772 0 0
LIBERTY GLOBAL PLC SHS CL C G5480U120 12,962 507,517 SH   SOLE   507,517 0 0
SCHRODINGER INC COM 80810D103 532,631 6,981,664 SH   SOLE   6,981,664 0 0
UNITED PARCEL SERVICE INC CL B 911312106 476,276 2,801,790 SH   SOLE   2,801,790 0 0
WALMART INC COM 931142103 1,032,404 7,600,706 SH   SOLE   7,600,706 0 0
WASTE MGMT INC DEL COM 94106L109 2,404,116 18,633,672 SH   SOLE   18,633,672 0 0