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 52,630 21,554 SH   SOLE   21,554 0 0
ALPHABET INC CAP STK CL C 02079K107 53,863 21,491 SH   SOLE   21,491 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 12,141,402 43,686,679 SH   SOLE   43,686,679 0 0
CANADIAN NATL RY CO COM 136375102 1,467,747 13,907,283 SH   SOLE   13,907,283 0 0
CATERPILLAR INC COM 149123101 2,210,415 10,156,756 SH   SOLE   10,156,756 0 0
COCA-COLA FEMSA SAB DE CV SPONSORD ADR REP 191241108 328,945 6,214,719 SH   SOLE   6,214,719 0 0
COUPANG INC CL A 22266T109 238,971 5,714,285 SH   SOLE   5,714,285 0 0
CROWN CASTLE INTL CORP NEW COM 22822V101 992,411 5,086,680 SH   SOLE   5,086,680 0 0
ECOLAB INC COM 278865100 899,353 4,366,427 SH   SOLE   4,366,427 0 0
FEDEX CORP COM 31428X106 445,619 1,493,712 SH   SOLE   1,493,712 0 0
GRUPO TELEVISA S A B SPON ADR REP ORD 40049J206 241,034 16,879,104 SH   SOLE   16,879,104 0 0
SCHRODINGER INC COM 80810D103 527,884 6,981,664 SH   SOLE   6,981,664 0 0
UNITED PARCEL SERVICE INC CL B 911312106 582,688 2,801,790 SH   SOLE   2,801,790 0 0
WALMART INC COM 931142103 1,071,852 7,600,706 SH   SOLE   7,600,706 0 0
WASTE MGMT INC DEL COM 94106L109 2,610,764 18,633,672 SH   SOLE   18,633,672 0 0