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
BARCLAYS BK PLC CONV ZERO CPN Convertible Bonds 06741JV89 41 46,000 PRN   SOLE 0 46,000 0 0
LAYNE CHRISTENSEN 4.25 CONVERT DUE 11/15/2018 Convertible Bonds 521050AB0 10,860 10,909,000 PRN   SOLE 0 10,909,000 0 0
APPLE INC. Common Stocks 037833100 18,160 108,238 SH   SOLE 0 108,238 0 0
ABB LIMITED Common Stocks 000375204 9,330 393,009 SH   SOLE 0 393,009 0 0
ACCENTURE PLC Common Stocks G1151C101 7,402 48,224 SH   SOLE 0 48,224 0 0
AMGEN INC Common Stocks 031162100 256 1,500 SH   SOLE 0 1,500 0 0
BRISTOL-MYERS SQUIBB CO Common Stocks 110122108 8,520 134,710 SH   SOLE 0 134,710 0 0
CELGENE CORPORATION Common Stocks 151020104 15,678 175,748 SH   SOLE 0 175,748 0 0
CHECK POINT SOFTWARE TECH Common Stocks M22465104 10,655 107,261 SH   SOLE 0 107,261 0 0
CISCO SYSTEMS, INC. Common Stocks 17275R102 240 5,600 SH   SOLE 0 5,600 0 0
DISH NETWORK CORP Common Stocks 25470M109 397 10,475 SH   SOLE 0 10,475 0 0
DORCHESTER MINERALS LP Common Stocks 25820R105 984 61,130 SH   SOLE 0 61,130 0 0
DELL TECHNOLOGIES CLASS V Common Stocks 24703L103 14,704 200,848 SH   SOLE 0 200,848 0 0
ENTERPRISE PRODUCTS PRTNS Common Stocks 293792107 26,133 1,067,538 SH   SOLE 0 1,067,538 0 0
TWENTY-FIRST CENTURY FOX, INC Common Stocks 90130A101 11,330 308,799 SH   SOLE 0 308,799 0 0
GILEAD SCIENCES, INC Common Stocks 375558103 12,657 167,881 SH   SOLE 0 167,881 0 0
ALPHABET INC CL C (GOOGLE C) Common Stocks 02079K107 29,391 28,485 SH   SOLE 0 28,485 0 0
ALPHABET INC CL A (GOOGLE A) Common Stocks 02079K305 18,072 17,425 SH   SOLE 0 17,425 0 0
HONEYWELL INTL INC Common Stocks 438516106 1,897 13,126 SH   SOLE 0 13,126 0 0
INDEPENDENT BANK GROUP, INC Common Stocks 45384B106 393 5,564 SH   SOLE 0 5,564 0 0
INOVALON HOLDINGS INC. (Class A) Common Stocks 45781D101 8,312 784,115 SH   SOLE 0 784,115 0 0
KINDER MORGAN, INC. Common Stocks 49456B101 15,331 1,018,004 SH   SOLE 0 1,018,004 0 0
LAS VEGAS SANDS Common Stocks 517834107 12,498 173,828 SH   SOLE 0 173,828 0 0
MONSANTO COMPANY Common Stocks 61166W101 20,860 178,760 SH   SOLE 0 178,760 0 0
THE MOSAIC COMPANY Common Stocks 61945C103 4,723 194,532 SH   SOLE 0 194,532 0 0
MATADOR RESOURCES CO. Common Stocks 576485205 1,346 45,000 SH   SOLE 0 45,000 0 0
NOBLE ENERGY INC Common Stocks 655044105 8,588 283,422 SH   SOLE 0 283,422 0 0
NIELSEN HOLDINGS PLC Common Stocks G6518L108 8,624 271,284 SH   SOLE 0 271,284 0 0
NVIDIA CORP Common Stocks 67066G104 232 1,000 SH   SOLE 0 1,000 0 0
QUALCOMM INC Common Stocks 747525103 26,017 469,543 SH   SOLE 0 469,543 0 0
SCHLUMBERGER LTD Common Stocks 806857108 11,048 170,551 SH   SOLE 0 170,551 0 0
XYLEM INC. Common Stocks 98419M100 12,574 163,467 SH   SOLE 0 163,467 0 0