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
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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
SABRE CORP 4 CONVERT DUE 04/15/2025 Convertible Bonds 78573NAE2   883,117 1,150,000 PRN   SOLE 0 1,150,000 0 0
APPLE INC. Common Stocks 037833100   39,873,443 205,565 SH   SOLE 0 205,565 0 0
ACCENTURE PLC Common Stocks G1151C101   8,691,156 28,165 SH   SOLE 0 28,165 0 0
AMGEN INC Common Stocks 031162100   333,030 1,500 SH   SOLE 0 1,500 0 0
AMAZON COM INC Common Stocks 023135106   704,596 5,405 SH   SOLE 0 5,405 0 0
ACTIVISION BLIZZARD, INC. Common Stocks 00507V109   27,626,965 327,722 SH   SOLE 0 327,722 0 0
BRISTOL-MYERS SQUIBB CO Common Stocks 110122108   24,137,352 377,441 SH   SOLE 0 377,441 0 0
BLACK STONE MINERALS LP Common Stocks 09225M101   23,968,001 1,502,696 SH   SOLE 0 1,502,696 0 0
ANHEUSER-BUSCH INBEV SA Common Stocks 03524A108   16,471,828 290,406 SH   SOLE 0 290,406 0 0
CHECK POINT SOFTWARE TECH Common Stocks M22465104   16,684,095 132,814 SH   SOLE 0 132,814 0 0
DESPEGAR.COM Common Stocks G27358103   1,399,425 198,500 SH   SOLE 0 198,500 0 0
WALT DISNEY COMPANY Common Stocks 254687106   220,879 2,474 SH   SOLE 0 2,474 0 0
DORCHESTER MINERALS LP Common Stocks 25820R105   571,637 19,080 SH   SOLE 0 19,080 0 0
EBAY INC Common Stocks 278642103   1,302,088 29,136 SH   SOLE 0 29,136 0 0
ENTERPRISE PRODUCTS PRTNS Common Stocks 293792107   32,172,033 1,220,950 SH   SOLE 0 1,220,950 0 0
SPDR GOLD TRUST Common Stocks 78463V107   447,993 2,513 SH   SOLE 0 2,513 0 0
ALPHABET INC CL C (GOOGLE C) Common Stocks 02079K107   60,930,412 503,682 SH   SOLE 0 503,682 0 0
ALPHABET INC CL A (GOOGLE A) Common Stocks 02079K305   24,096,568 201,308 SH   SOLE 0 201,308 0 0
HONEYWELL INTL INC Common Stocks 438516106   2,171,073 10,463 SH   SOLE 0 10,463 0 0
JP MORGAN CHASE & CO Common Stocks 46625H100   341,784 2,350 SH   SOLE 0 2,350 0 0
KINDER MORGAN, INC. Common Stocks 49456B101   28,420,594 1,650,441 SH   SOLE 0 1,650,441 0 0
LOCKHEED MARTIN CORP Common Stocks 539830109   20,583,590 44,710 SH   SOLE 0 44,710 0 0
LIBERTY MEDIA - SIRIUSXM CL C Common Stocks 531229607   14,117,529 431,333 SH   SOLE 0 431,333 0 0
LAS VEGAS SANDS Common Stocks 517834107   19,028,814 328,083 SH   SOLE 0 328,083 0 0
MICROSOFT CORPORATION Common Stocks 594918104   564,956 1,659 SH   SOLE 0 1,659 0 0
MATCH GROUP INC. Common Stocks 57667L107   9,258,141 221,222 SH   SOLE 0 221,222 0 0
MATADOR RESOURCES CO. Common Stocks 576485205   1,569,600 30,000 SH   SOLE 0 30,000 0 0
NVIDIA CORP Common Stocks 67066G104   790,201 1,868 SH   SOLE 0 1,868 0 0
PAYCHEX INC. Common Stocks 704326107   657,907 5,881 SH   SOLE 0 5,881 0 0
PEPSICO INC Common Stocks 713448108   423,413 2,286 SH   SOLE 0 2,286 0 0
PROCTER & GAMBLE Common Stocks 742718109   217,747 1,435 SH   SOLE 0 1,435 0 0
PAYPAL HOLDINGS, INC. Common Stocks 70450Y103   27,438,375 411,185 SH   SOLE 0 411,185 0 0
QUALCOMM INC Common Stocks 747525103   26,287,365 220,828 SH   SOLE 0 220,828 0 0
REATA PHARMACEUTICALS INC. Common Stocks 75615P103   261,527 2,565 SH   SOLE 0 2,565 0 0
RAYTHEON TECHNOLOGIES CORP. Common Stocks 75513E101   19,528,130 199,348 SH   SOLE 0 199,348 0 0
SPROUTS FARMERS MARKET INC Common Stocks 85208M102   16,910,602 460,403 SH   SOLE 0 460,403 0 0
SHELL PLC Common Stocks 780259305   34,017,186 563,385 SH   SOLE 0 563,385 0 0
SPIRIT AEROSYSTEMS Common Stocks 848574109   18,065,282 618,886 SH   SOLE 0 618,886 0 0
SPDR S & P 500 ETF Common Stocks 78462F103   318,621 719 SH   SOLE 0 719 0 0
UNITEDHEALTH GROUP INC. Common Stocks 91324P102   25,323,960 52,688 SH   SOLE 0 52,688 0 0
VISA, INC. Common Stocks 92826C839   760,411 3,202 SH   SOLE 0 3,202 0 0
VANGUARD S&P 500 ETF Common Stocks 922908413   1,099,249 2,699 SH   SOLE 0 2,699 0 0
EXXON MOBIL CORP Common Stocks 30231G102   290,326 2,707 SH   SOLE 0 2,707 0 0
XYLEM INC. Common Stocks 98419M100   12,539,223 111,341 SH   SOLE 0 111,341 0 0