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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F
FORM 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: December 31, 1999
Check here if Amendment [ ] Amendment Number:
This Amendment (Check only one.) [ ] is restatement.
[ ] adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: J. & W. Seligman & Co. Incorporated
Address: 100 Park Avenue
New York, NY 10017
13F File Number:28-861
The institutional investment manager filing this report and the
person by whom it is signed hereby represent that the person
signing the report is authorized to submit it, that all
information contained herein is true, correct and complete, and
that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of
this form.
Person Signing this Report on Behalf of reporting Manager:
Name: Brian T. Zino
Title: President
Phone: 212-850-1864
Signature, Placce, and Date of Signing:
Brian T. Zino New York, New York February 8, 2000
Report Type (Check only one.):
[ ] 13F HOLDINGS REPORT.
[ ] 13F NOTICE.
[X] 13F COMBINATION REPORT.
List of Other Managers Reporting for this Manager:
I AM SIGNING THIS REPORT AS REQUIRED BY THE SECUTIRIES EXCHANGE
ACT OF 1934.
J. & W. Seligman & Co. Incorporated
(Name of Institutional Investment Manager)
/s/ Brian T. Zino
------------------------------------
(Manual Signature of Person Duly Authorized to submit This Report)
<PAGE>
FORM 13F SUMMARY PAGE
Report Summary:
Number of Other Included Managers: 1
Form 13F Information Table Entry Total: 642
Form 13F Information Table Value Total: $28,084,126,927
List of Other Included Managers:
No. 13F File Number Name
01 28-3314 Seligman Henderson Co.
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12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 1
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
ABC-NACO INC COMMON 000752105 5,191,519 629,275 X 629,275
359,329 43,555 X 43,555
ACT MFG INC COMMON 000973107 16,286,250 434,300 X 434,300
AFLAC INC COMMON 001055102 9,579,063 203,000 X 203,000
246,319 5,220 X 5,220
AES CORP COMMON 00130H105 98,419,588 1,316,650 X 1,316,650
2,711,183 36,270 X 36,270
4,492,475 60,100 X 60,100
AK STL HLDG CORP COMMON 001547108 7,419,385 393,080 X 393,080
429,123 22,735 X 22,735
AMFM INC COMMON 001693100 534,745,007 6,833,802 X 6,833,802
AMFM INC PFD CONV 7% CONVERT 001693209 408,738 1,900 X 1,900
AT&T CORP COMMON 001957109 119,739,656 2,356,500 X 2,356,500
AT&T CORP - LIBERTY MEDIA COMMON 001957208 133,168,500 2,344,000 X 2,344,000
AVX CORP NEW COMMON 002444107 509,363 10,200 X 10,200
58,376,938 1,169,000 X 1,169,000
11,686,673 234,026 X 234,026
AXA FINANCIAL INC COMMON 002451102 108,003,890 3,176,585 X 3,176,585
30,968,560 910,840 X 910,840
ABBOTT LABS COMMON 002824100 50,423,538 1,388,600 X 1,388,600
ABERCROMBIE & FITCH CO COMMON 002896207 12,431,705 465,825 X 465,825
408,452 15,305 X 15,305
ABRAXAS PETROLEUM CORP COMMON 003830106 1,213,104 1,021,561 X 1,021,561
ABRAXAS PETROLEUM CONTINGENT RIGHCOMMON 003831112 102,156 1,021,561 X 1,021,561
ACCLAIM ENTMT INC COMMON 004325205 22,715,025 4,432,200 X 4,432,200
ACKERLEY GROUP INC COMMON 004527107 18,853,625 1,040,200 X 1,040,200
ACNIELSEN CORP COMMON 004833109 256,100 10,400 X 10,400
4,021,263 163,300 X 163,300
2,224,253 90,325 X 90,325
ACORN PRODS INC COMMON 004857108 1,048,088 698,725 X 698,725
46,650 31,100 X 31,100
Total 1,256,485,513
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 2
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
ACTIVISION INC NEW COMMON 004930202 29,014,125 1,894,800 X 1,894,800
ACTIVISION INC. CONVERT 004930AA1 10,349,063 10,375,000 X 10,375,000
ACXIOM CORP COMMON 005125109 7,173,600 298,900 X 298,900
ADAPTEC INC COMMON 00651F108 209,036,100 4,191,200 X 4,191,200
ADELPHIA COMMUNICATIONS CORP COMMON 006848105 341,250 5,200 X 5,200
104,366,719 1,590,350 X 1,590,350
2,496,047 38,035 X 38,035
ADVANCED FIBRE COMMUNICATIONS COMMON 00754A105 777,563 17,400 X 17,400
1,890,281 42,300 X 42,300
6,259,825 140,080 X 140,080
ADVANCED MICRO DEVICES INC COMMON 007903107 75,431,381 2,606,700 X 2,606,700
ADVENT SOFTWARE INC COMMON 007974108 34,021,196 527,972 X 527,972
5,125,423 79,541 X 79,541
AFFILIATED COMPUTER SERVICES COMMON 008190100 22,875,800 497,300 X 497,300
3,336,104 72,524 X 72,524
AFFILIATED MANAGERS GROUP COMMON 008252108 45,597,325 1,127,600 X 1,127,600
6,824,556 168,768 X 168,768
AFFYMETRIX INC COMMON 00826T108 24,706,500 145,600 X 145,600
2,881,294 16,980 X 16,980
AGENCY.COM LIMITED COMMON 008447104 2,346,000 46,000 X 46,000
AGILENT TECHNOLOGIES INC COMMON 00846U101 15,354,263 198,600 X 198,600
467,354 6,045 X 6,045
935,481 12,100 X 12,100
ELECTROLUX AB COMMON 010198208 140,449 2,795 X 2,795
672,948 13,392 X 13,392
ALLIED CAPITAL CORP COMMON 01903Q108 6,052,281 330,500 X 330,500
118,482 6,470 X 6,470
ALLIED ZURICH PLC COMMON 01959Q101 117,354 4,960 X 4,960
563,727 23,826 X 23,826
ALLSTATE CORP COMMON 020002101 73,244,445 3,043,925 X 3,043,925
18,974,749 788,561 X 788,561
ALLTEL CORP COMMON 020039103 49,613 600 X 600
Total 711,541,297
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 3
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
ALPHARMA INC COMMON 020813101 20,205,825 657,100 X 657,100
2,159,111 70,215 X 70,215
ALZA CORP DEL COMMON 022615108 6,983,863 201,700 X 201,700
139,193 4,020 X 4,020
AMERICA ONLINE INC DEL COMMON 02364J104 104,009,450 1,370,800 X 1,370,800
1,470,458 19,380 X 19,380
3,035,000 40,000 X 40,000
AMERICAN CAPITAL STRATEGIES COMMON 024937104 2,040,675 89,700 X 89,700
AMERICAN GENERAL CORP COMMON 026351106 96,998,600 1,278,400 X 1,278,400
AMERICAN HOME PRODS CORP COMMON 026609107 112,843,750 2,875,000 X 2,875,000
10,138,275 258,300 X 258,300
AMERICAN INTL GROUP INC COMMON 026874107 138,666,501 1,282,465 X 1,282,465
1,331,695 12,316 X 12,316
2,176,016 20,125 X 20,125
AMERICAN MOBILE SATELLITE CORP COMMON 02755R103 32,891,200 1,561,600 X 1,561,600
AMERICAN NATIONAL CAN GROUP COMMON 027714104 6,924,775 532,675 X 532,675
562,055 43,235 X 43,235
AMERICAN PWR CONVERSION CORP COMMON 029066107 281,297,288 10,665,300 X 10,665,300
207,571 7,870 X 7,870
AMERICAN TOWER CORP -CL A COMMON 029912201 504,281 16,500 X 16,500
1,228,613 40,200 X 40,200
3,726,486 121,930 X 121,930
AMGEN INC COMMON 031162100 14,030,600 233,600 X 233,600
518,339 8,630 X 8,630
997,038 16,600 X 16,600
AMKOR TECHNOLOGIES INC COMMON 031652100 306,478,600 10,848,800 X 10,848,800
ANADARKO PETE CORP COMMON 032511107 10,238 300 X 300
ANADIGICS INC COMMON 032515108 45,658,625 967,600 X 967,600
8,080,482 171,242 X 171,242
ANALOG DEVICES INC COMMON 032654105 38,771,700 416,900 X 416,900
ANHEUSER BUSCH COS INC COMMON 035229103 54,410,738 767,700 X 767,700
ANSWERTHINK CONSULTING GROUP COMMON 036916104 16,289,300 475,600 X 475,600
Total 1,314,786,337
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 4
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
82,200 2,400 X 2,400
APEX INC COMMON 037548104 128,280,825 3,977,700 X 3,977,700
4,138,320 128,320 X 128,320
APOGEE ENTERPRISES INC COMMON 037598109 2,731,725 539,600 X 539,600
122,842 24,265 X 24,265
APRIA HEALTHCARE GROUP INC COMMON 037933108 8,085,597 450,765 X 450,765
606,826 33,830 X 33,830
APPLIED GRAPHICS TECHNOLOGIES COMMON 037937109 8,519,775 987,800 X 987,800
1,211,856 140,505 X 140,505
APPLIED EXTRUSION TECHNOLOGIES COMMON 038196101 4,454,161 727,210 X 727,210
140,048 22,865 X 22,865
APPLIED MATLS INC COMMON 038222105 231,280,700 1,825,600 X 1,825,600
APPLIED PWR INC COMMON 038225108 448,350 12,200 X 12,200
1,389,150 37,800 X 37,800
3,396,251 92,415 X 92,415
APPLIED MICRO CIRCUITS CORP COMMON 03822W109 38,556,750 303,000 X 303,000
1,963,213 15,428 X 15,428
APPNET SYSTEMS INC COMMON 03831Q101 51,003,750 1,165,800 X 1,165,800
ARGENTARIA CAJA POSTAL Y BANCO SPCOMMON 04011W108 132,525 2,850 X 2,850
652,628 14,035 X 14,035
ARIBA INC COMMON 04033V104 7,449,750 42,000 X 42,000
148,995 840 X 840
ARMSTRONG WORLD INDS INC COMMON 042476101 56,220,989 1,684,524 X 1,684,524
15,144,006 453,753 X 453,753
ARROW ELECTRS INC COMMON 042735100 2,740,500 108,000 X 108,000
ARTESYN TECHNOLOGIES INC COMMON 043127109 5,718,300 272,300 X 272,300
ASAHI CHEM INDUS - UNSPON ADR COMMON 043389204 115,922 2,260 X 2,260
546,270 10,650 X 10,650
ASPECT DEV INC COMMON 045234101 44,148,250 644,500 X 644,500
5,090,920 74,320 X 74,320
ASPECT COMMUNICATIONS CORP. COMMON 04523Q102 516,450 13,200 X 13,200
75,116,088 1,919,900 X 1,919,900
Total 700,153,931
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 5
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
3,897,437 99,615 X 99,615
ASTRAZENECA PLC -SPONS ADR COMMON 046353108 X
X
ASYST TECHNOLOGY CORP COMMON 04648X107 44,379,256 676,900 X 676,900
ATLANTIC RICHFIELD CO COMMON 048825103 2,076,000 24,000 X 24,000
ATMEL CORP COMMON 049513104 61,578,688 2,083,000 X 2,083,000
AUTOBYTEL.COM INC COMMON 05275N106 10,505,194 691,700 X 691,700
AUTODESK INC COMMON 052769106 185,625 5,500 X 5,500
117,372,375 3,477,700 X 3,477,700
1,431,675 42,420 X 42,420
AVANT CORP COMMON 053487104 286,500 19,100 X 19,100
24,042,750 1,602,850 X 1,602,850
5,189,760 345,984 X 345,984
AVERY DENNISON CORP COMMON 053611109 13,212,238 181,300 X 181,300
262,350 3,600 X 3,600
AVNET INC COMMON 053807103 38,157,350 630,700 X 630,700
AXA-UAP COMMON 054536107 152,650 2,150 X 2,150
776,527 10,937 X 10,937
BJS WHOLESALE CLUB INC COMMON 05548J106 445,300 12,200 X 12,200
7,761,725 212,650 X 212,650
3,304,710 90,540 X 90,540
BP AMOCO PLC - SPONS ADR COMMON 055622104 78,485,028 1,323,246 X 1,323,246
BMC SOFTWARE INC COMMON 055921100 113,399,338 1,418,600 X 1,418,600
848,137 10,610 X 10,610
1,558,781 19,500 X 19,500
BWAY CORP COMMON 056039100 2,973,841 485,525 X 485,525
140,477 22,935 X 22,935
BANK OF AMERICA CORP COMMON 060505104 183,795,016 3,662,167 X 3,662,167
20,793,986 414,326 X 414,326
BANK OF NEW YORK CO INC. COMMON 064057102 234,337,880 5,858,447 X 5,858,447
31,652,000 791,300 X 791,300
BANK TOKYO-MITSUBISHI LTD COMMON 065379109 112,127 8,045 X 8,045
Total 1,003,114,721
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 6
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
552,315 39,628 X 39,628
BANK UTD CORP COMMON 065412108 5,537,200 203,200 X 203,200
288,441 10,585 X 10,585
BARR LABS INC COMMON 068306109 25,200,400 803,200 X 803,200
4,071,816 129,779 X 129,779
BARRETT RES CORP COMMON 068480201 264,938 9,000 X 9,000
3,940,209 133,850 X 133,850
2,043,993 69,435 X 69,435
BAXTER INTL INC COMMON 071813109 149,823,013 2,385,242 X 2,385,242
27,200,953 433,050 X 433,050
BAY VIEW CAP CORP DEL COMMON 07262L101 6,398,421 450,990 X 450,990
396,470 27,945 X 27,945
BAYER A G COMMON 072730302 87,388 1,855 X 1,855
460,541 9,776 X 9,776
BAYERISCHE HYPO-UND VER-ADR COMMON 072735103 99,217 1,460 X 1,460
504,241 7,420 X 7,420
BERKLEY W R CORP COMMON 084423102 4,752,841 227,681 X 227,681
310,098 14,855 X 14,855
BESTFOODS COMMON 08658U101 65,934,400 1,254,400 X 1,254,400
BEYOND.COM CORPORATION COMMON 08860E101 9,746,875 1,247,600 X 1,247,600
BINDVIEW DEVELOPMENT CORP COMMON 090327107 253,406 5,100 X 5,100
9,187,219 184,900 X 184,900
1,825,519 36,740 X 36,740
BIOGEN INC COMMON 090597105 456,300 5,400 X 5,400
10,714,600 126,800 X 126,800
3,521,538 41,675 X 41,675
BIOMET INC COMMON 090613100 3,800,000 95,000 X 95,000
75,800 1,895 X 1,895
BLUESTONE SOFTWARE RESTRICTED COMMON 096239991 2,832,030 166,590 X 166,590
BOEING CO COMMON 097023105 12,431 300 X 300
BRISTOL MYERS SQUIBB CO COMMON 110122108 165,413,498 2,577,036 X 2,577,036
29,656,486 462,029 X 462,029
BRITISH AWYS PLC COMMON 110419306 6,438 100 X 100
Total 535,369,035
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 7
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
BRITISH AMERICAN TOBACCO COMMON 110448107 X
BRITISH TELECOMMUNICATIONS PLC COMMON 111021408 135,660 570 X 570
642,124 2,698 X 2,698
BROADCOM CORP-CL A COMMON 111320107 25,821,150 94,800 X 94,800
714,984 2,625 X 2,625
898,838 3,300 X 3,300
BROKEN HILL PROPRIETARY COMPANY LCOMMON 112169602 110,500 4,160 X 4,160
564,188 21,240 X 21,240
BURR BROWN CORP COMMON 122574106 97,576,678 2,701,085 X 2,701,085
13,107,631 362,841 X 362,841
CBT GROUP PLC SPONS ADR COMMON 124853300 314,900 9,400 X 9,400
21,339,500 637,000 X 637,000
5,334,038 159,225 X 159,225
CBS CORP COMMON 12490K107 256,095,263 4,005,400 X 4,005,400
1,342,048 20,990 X 20,990
2,627,831 41,100 X 41,100
C-CUBE MICROSYSTEMS INC COMMON 125015107 269,013,375 4,321,500 X 4,321,500
CSG SYS INTL INC COMMON 126349109 406,725 10,200 X 10,200
149,622,963 3,752,300 X 3,752,300
8,257,714 207,090 X 207,090
CVS CORP COMMON 126650100 12,042,250 302,000 X 302,000
CABLE & WIRELESS PLC-SP ADR COMMON 126830207 121,756 2,300 X 2,300
626,780 11,840 X 11,840
CABLEVISION SYS CORP COMMON 12686C109 94,994,100 1,258,200 X 1,258,200
CABOT OIL & GAS CORP COMMON 127097103 3,940,131 245,300 X 245,300
CADENCE DESIGN SYSTEM INC COMMON 127387108 18,669,600 777,900 X 777,900
370,440 15,435 X 15,435
CADMUS COMMUNICATIONS CORP COMMON 127587103 6,201,728 729,615 X 729,615
315,733 37,145 X 37,145
CALIPER TECHNOLOGIES CORP COMMON 130876105 23,035,425 345,100 X 345,100
2,624,610 39,320 X 39,320
CANDESCENT TECHNOLOGY CORP CONVERT 137392AA4 2,280,000 3,000,000 X 3,000,000
Total 1,019,148,660
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 8
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
CANON INC COMMON 138006309 185,573 4,575 X 4,575
925,717 22,822 X 22,822
CAPITAL ONE FINL CORP COMMON 14040H105 5,662,031 117,500 X 117,500
106,976 2,220 X 2,220
CAPITAL SR LIVING CORP COMMON 140475104 5,747,203 1,135,250 X 1,135,250
842,770 166,473 X 166,473
CAPSTAR COMMUNICATIONS INC CONVERT 14066Q203 X
CAREER EDUCATION CORP COMMON 141665109 6,968,900 181,600 X 181,600
CAREMARK RX INC COMMON 141705103 232,875 46,000 X 46,000
653,822 129,150 X 129,150
1,781,975 351,995 X 351,995
CAREINSITE INC COMMON 14170M106 24,198,300 300,600 X 300,600
2,887,535 35,870 X 35,870
CAREY INTERNATIONAL INC COMMON 141750109 24,657,750 1,011,600 X 1,011,600
2,881,247 118,205 X 118,205
CARNIVAL CORP COMMON 143658102 22,988,250 480,800 X 480,800
792,731 16,580 X 16,580
1,630,406 34,100 X 34,100
CENDANT CORP COMMON 151313103 23,933 901 X 901
CENTURYTEL INC COMMON 156700106 464,275 9,800 X 9,800
60,483,663 1,276,700 X 1,276,700
3,435,825 72,524 X 72,524
CERIDIAN CORP COMMON 15677T106 327,750 15,200 X 15,200
4,577,719 212,300 X 212,300
2,415,108 112,005 X 112,005
CHAMPION INTL CORP COMMON 158525105 126,735,583 2,046,185 X 2,046,185
40,192,792 648,925 X 648,925
CHARTER COMMUNICATIONS INC-A COMMON 16117M107 196,875 9,000 X 9,000
107,398,594 4,909,650 X 4,909,650
1,481,703 67,735 X 67,735
439,688 20,100 X 20,100
CHINA TELECOM HK LTD-SP ADR COMMON 169428109 151,134 1,175 X 1,175
798,761 6,210 X 6,210
CHIRON CORP COMMON 170040109 550,875 13,000 X 13,000
Total 452,818,339
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 9
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
1,701,356 40,150 X 40,150
4,077,958 96,235 X 96,235
CHOICEPOINT INC COMMON 170388102 488,225 11,800 X 11,800
868,875 21,000 X 21,000
3,453,571 83,470 X 83,470
CHUBB CORP COMMON 171232101 45,224,569 803,100 X 803,100
CIENA CORP COMMON 171779101 13,190,500 229,400 X 229,400
255,875 4,450 X 4,450
CIRCUIT CITY STORE INC COMMON 172737108 14,478,581 321,300 X 321,300
277,360 6,155 X 6,155
CISCO SYS INC COMMON 17275R102 270,929,838 2,529,100 X 2,529,100
1,826,481 17,050 X 17,050
3,631,538 33,900 X 33,900
CINTAS CORP COMMON 172908105 17,013,281 320,250 X 320,250
229,234 4,315 X 4,315
CITIGROUP INC COMMON 172967101 264,803,056 4,755,162 X 4,755,162
42,650,527 765,891 X 765,891
1,194,497 21,450 X 21,450
CITRIX SYS INC COMMON 177376100 64,575,000 525,000 X 525,000
CLEAR CHANNEL COMMUNICATIONS COMMON 184502102 45,517,500 510,000 X 510,000
376,189 4,215 X 4,215
696,150 7,800 X 7,800
CLOROX CO DEL COMMON 189054109 83,642,549 1,660,398 X 1,660,398
127,953 2,540 X 2,540
COCA COLA CO COMMON 191216100 110,558,500 1,898,000 X 1,898,000
1,996,519 34,275 X 34,275
3,937,700 67,600 X 67,600
COGNEX CORP COMMON 192422103 170,596,374 4,374,266 X 4,374,266
7,499,895 192,305 X 192,305
COLGATE PALMOLIVE CO COMMON 194162103 20,488,000 315,200 X 315,200
598,650 9,210 X 9,210
1,228,500 18,900 X 18,900
COMCAST CORP -CL A COMMON 200300101 6,075,338 126,900 X 126,900
365,286 7,630 X 7,630
718,125 15,000 X 15,000
Total 1,205,293,549
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 10
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
COMCAST CORP COMMON 200300200 5,056,250 100,000 X 100,000
COMDISCO INC COMMON 200336105 271,925 7,300 X 7,300
57,908,850 1,554,600 X 1,554,600
2,092,519 56,175 X 56,175
COMMERCE BANCORP INC NJ COMMON 200519106 2,940,029 72,706 X 72,706
1,490,001 36,847 X 36,847
COMMERCE ONE INC COMMON 200693109 4,883,025 24,850 X 24,850
105,128 535 X 535
COMMERCIAL FEDERAL CORPORATION COMMON 201647104 5,289,066 296,930 X 296,930
394,013 22,120 X 22,120
COMPLETE BUSINESS SOLUTIONS COMMON 20452F107 8,591,996 341,970 X 341,970
538,052 21,415 X 21,415
COMPUTER ASSOC INTL INC COMMON 204912109 138,616,125 1,982,000 X 1,982,000
1,107,460 15,835 X 15,835
2,587,688 37,000 X 37,000
COMPUWARE CORP COMMON 205638109 301,169,975 8,085,100 X 8,085,100
1,426,005 38,282 X 38,282
2,398,900 64,400 X 64,400
COMVERSE TECHNOLOGY INC COMMON 205862402 217,125 1,500 X 1,500
506,625 3,500 X 3,500
1,598,040 11,040 X 11,040
CONAGRA INC COMMON 205887102 91,336,132 4,025,835 X 4,025,835
6,885,770 303,505 X 303,505
CONCORD COMMUNICATIONS INC COMMON 206186108 16,165,813 364,300 X 364,300
1,143,322 25,765 X 25,765
CONCORD EFS INC COMMON 206197105 10,446,775 405,700 X 405,700
207,030 8,040 X 8,040
COPART INC COMMON 217204106 7,238,400 166,400 X 166,400
COPPER MOUNTAIN NETWORKS INC COMMON 217510106 16,204,500 332,400 X 332,400
1,724,531 35,375 X 35,375
CORN PRODS INTL INC COMMON 219023108 3,275 100 X 100
CORNELL CORRECTIONS INC COMMON 219141108 5,643,075 673,800 X 673,800
1,241,979 148,296 X 148,296
Total 697,429,395
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 11
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
CORNING INC COMMON 219350105 69,265,225 537,200 X 537,200
2,053,974 15,930 X 15,930
3,468,419 26,900 X 26,900
CORPORATE EXECUTIVE BOARD CO COMMON 21988R102 23,545,725 421,400 X 421,400
2,487,946 44,527 X 44,527
CORRECTIONAL PROPERTIES TRST COMMON 22025E104 13,372,100 1,091,600 X 1,091,600
2,461,576 200,945 X 200,945
COSTAR GROUP INC COMMON 22160N109 35,662,261 994,070 X 994,070
3,412,789 95,130 X 95,130
COVAD COMMUNICATIONS GROUP COMMON 222814204 7,814,469 139,700 X 139,700
COX RADIO INC COMMON 224051102 458,850 4,600 X 4,600
1,541,138 15,450 X 15,450
3,984,015 39,940 X 39,940
CREDENCE SYS CORP COMMON 225302108 202,319,089 2,338,949 X 2,338,949
11,475,177 132,661 X 132,661
CREO PRODUCTS INC COMMON 225606102 3,236,438 84,200 X 84,200
CROSS TIMBERS OIL CO COMMON 227573102 18,790,396 2,073,423 X 2,073,423
3,553,850 392,149 X 392,149
CROWN CASTLE INTL CORP COMMON 228227104 14,048,263 437,300 X 437,300
CROWN CORK & SEAL INC COMMON 228255105 64,646,633 2,889,235 X 2,889,235
18,641,217 833,127 X 833,127
CUBIC CORP COMMON 229669106 6,299,891 287,995 X 287,995
439,578 20,095 X 20,095
CUMULUS MEDIA INC COMMON 231082108 27,217,225 536,300 X 536,300
4,680,470 92,226 X 92,226
CUTTER & BUCK INC COMMON 232217109 6,941,241 458,925 X 458,925
395,277 26,134 X 26,134
CYPRESS SEMICONDUCTOR CORP COMMON 232806109 50,618,313 1,563,500 X 1,563,500
CYTYC CORP COMMON 232946103 9,635,663 157,800 X 157,800
940,057 15,395 X 15,395
DII GROUP INC COMMON 232949107 126,381,150 1,780,800 X 1,780,800
DQE INC COMMON 23329J104 1,212 35 X 35
Total 739,789,623
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 12
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
55,227 1,595 X 1,595
DAIWA SECURITIES-UNSPONS ADR COMMON 234064202 210,119 1,345 X 1,345
1,017,010 6,510 X 6,510
DAL-TILE INTL INC COMMON 23426R108 7,507,434 741,475 X 741,475
464,940 45,920 X 45,920
DALLAS SEMICONDUCTOR CORP COMMON 235204104 103,409,300 1,604,800 X 1,604,800
DANAHER CORP DEL COMMON 235851102 1,075,975 22,300 X 22,300
77,441 1,605 X 1,605
DAYTON HUDSON CORP COMMON 239753106 18,976,250 258,400 X 258,400
625,541 8,518 X 8,518
1,362,266 18,550 X 18,550
DELL COMPUTER CORP COMMON 247025109 81,492,900 1,597,900 X 1,597,900
798,405 15,655 X 15,655
1,601,400 31,400 X 31,400
DELPHI AUTOMOTIVE SYSTEMS COMMON 247126105 7,151 454 X 454
DELTATHREE.COM INC CL A COMMON 24783N102 1,246,300 48,400 X 48,400
DEVRY INC DEL COMMON 251893103 24,577,500 1,310,800 X 1,310,800
3,659,138 195,154 X 195,154
DIAL CORP NEW COMMON 25247D101 93,460,897 3,844,150 X 3,844,150
24,721,850 1,016,837 X 1,016,837
DIGITAL MICROWAVE CORP COMMON 253859102 10,546,875 450,000 X 450,000
DISNEY WALT CO COMMON 254687106 21,232,575 725,900 X 725,900
706,446 24,152 X 24,152
1,404,000 48,000 X 48,000
DOBSON COMMUNICATIONS CONVERT 256072505 10,330,171 9,456 X 9,456
DOCUMENTUM INC COMMON 256159104 9,771,600 163,200 X 163,200
DOLE FOOD INC COMMON 256605106 48,115,275 2,960,940 X 2,960,940
12,305,231 757,245 X 757,245
DOUBLECLICK INC. COMMON 258609304 96,847,019 382,700 X 382,700
10,531,196 41,615 X 41,615
DOW CHEM CO COMMON 260543103 77,626,103 580,925 X 580,925
24,017,089 179,735 X 179,735
Total 689,780,623
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 13
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
DOW JONES & CO INC COMMON 260561105 4,134,400 60,800 X 60,800
DU PONT E I DE NEMOURS & CO COMMON 263534109 54,341,934 824,925 X 824,925
73,582 1,117 X 1,117
DURA PHARMACEUTICALS INC COMMON 26632S109 20,304,150 1,456,800 X 1,456,800
2,878,651 206,540 X 206,540
ENSCO INTL INC COMMON 26874Q100 377,438 16,500 X 16,500
1,685,888 73,700 X 73,700
2,900,436 126,795 X 126,795
EOG RESOURCES INC COMMON 26875P101 105,375 6,000 X 6,000
5,072,050 288,800 X 288,800
1,066,658 60,735 X 60,735
E-STAMP CORP COMMON 269154100 3,321,925 149,300 X 149,300
EARTHLINK NETWORK INC COMMON 270322100 858,500 20,200 X 20,200
ECHOSTAR COMMUNICATIONS NEW COMMON 278762109 81,753,750 838,500 X 838,500
EGREETINGS NETWORK INC COMMON 282343102 3,109,388 307,100 X 307,100
360,045 35,560 X 35,560
EL PASO NAT GAS CO COMMON 283905107 44,633,987 1,149,990 X 1,149,990
11,269,209 290,350 X 290,350
ELAN PLC COMMON 284131208 11,210,590 380,020 X 380,020
833,228 28,245 X 28,245
ELECTRO SCIENTIFIC INDS COMMON 285229100 116,836,500 1,600,500 X 1,600,500
ELECTRONIC ARTS INC COMMON 285512109 336,000 4,000 X 4,000
59,425,800 707,450 X 707,450
2,629,620 31,305 X 31,305
ELECTRONIC DATA SYS NEW COMMON 285661104 109,814,316 1,640,550 X 1,640,550
ELECTRONICS FOR IMAGING INC COMMON 286082102 351,923,625 6,054,600 X 6,054,600
EMUSIC.COM INC COMMON 292476108 10,076,775 983,100 X 983,100
EMUSIC.COM-RESTRICTED COMMON 292476991 11,925,000 1,000,000 X 1,000,000
ENGAGE TECHNOLOGIES INC COMMON 292827102 56,016,000 933,600 X 933,600
6,163,800 102,730 X 102,730
ENRON CORP COMMON 293561106 25,861,750 582,800 X 582,800
Total 1,001,300,369
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 14
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
931,209 20,985 X 20,985
1,832,688 41,300 X 41,300
ENTRUST TECHNOLOGIES INC COMMON 293848107 66,153,019 1,103,700 X 1,103,700
EQUITABLE RES INC COMMON 294549100 6,712,213 201,115 X 201,115
451,898 13,540 X 13,540
ERICSSON L M TEL CO COMMON 294821400 184,253 2,805 X 2,805
936,769 14,261 X 14,261
ESPEED INC- CL A COMMON 296643109 2,133,750 60,000 X 60,000
ETOYS INC COMMON 297862104 6,636,000 252,800 X 252,800
E-STAMP RESTRICTED COMMON 297999997 3,036,204 152,765 X 152,765
EXAR CORP COMMON 300645108 22,378,388 380,100 X 380,100
2,145,994 36,450 X 36,450
EXPEDITORS INTL WASH INC COMMON 302130109 21,178,963 483,400 X 483,400
2,182,301 49,810 X 49,810
EXXON MOBIL CORP COMMON 30231G102 139,258,162 1,728,573 X 1,728,573
83,785 1,040 X 1,040
FAIRCHILD SEMICON INTL - CL A COMMON 303726103 28,098,875 944,500 X 944,500
FAMILY DLR STORES INC COMMON 307000109 156,600 9,600 X 9,600
443,700 27,200 X 27,200
1,129,804 69,260 X 69,260
FASTENAL CO COMMON 311900104 7,751,719 172,500 X 172,500
152,563 3,395 X 3,395
FEDERAL NATL MTG ASSN COMMON 313586109 157,444,211 2,521,629 X 2,521,629
24,277,698 388,832 X 388,832
FINISAR CORPORATION COMMON 31787A101 15,889,900 176,800 X 176,800
151,889 1,690 X 1,690
FIRST DATA CORP COMMON 319963104 51,428,006 1,042,900 X 1,042,900
FIRSTSERVICE CORP COMMON 33761N109 6,487,875 474,000 X 474,000
FISERV INC COMMON 337738108 434,847 11,350 X 11,350
6,167,470 160,978 X 160,978
3,414,793 89,130 X 89,130
FLUOR CORP COMMON 343861100 8,174,925 178,200 X 178,200
Total 587,840,469
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 15
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
224,099 4,885 X 4,885
FORD MTR CO DEL COMMON 345370100 153,901,459 2,886,780 X 2,886,780
25,742,847 482,867 X 482,867
FOREST LABS INC COMMON 345838106 337,906 5,500 X 5,500
17,823,019 290,100 X 290,100
3,042,385 49,520 X 49,520
FORRESTER RESH INC COMMON 346563109 25,428,650 369,200 X 369,200
2,715,053 39,420 X 39,420
FORTIS (NL) - SPONS ADR COMMON 34956J101 150,853 4,210 X 4,210
753,010 21,015 X 21,015
FORWARD AIR CORPORATION COMMON 349853101 2,476,713 57,100 X 57,100
FOUNDRY NETWORKS INC COMMON 35063R100 8,899,781 29,500 X 29,500
159,894 530 X 530
FOX ENTERTAINMENT GRP INC-A COMMON 35138T107 78,014,475 3,128,400 X 3,128,400
FREDS INC COMMON 356108100 9,768,126 612,902 X 612,902
680,213 42,680 X 42,680
FREEPORT-MCMORAN COPPER & GOLD COMMON 35671D857 169,000 8,000 X 8,000
407,713 19,300 X 19,300
1,292,850 61,200 X 61,200
FUJITSU LTD - UNSPON ADR COMMON 359590304 143,414 630 X 630
730,726 3,210 X 3,210
FURNITURE BRANDS INTL INC COMMON 360921100 7,774,470 353,385 X 353,385
526,790 23,945 X 23,945
GKN PUB LTD COMMON 361755200 120,279 7,425 X 7,425
610,549 37,690 X 37,690
GTE CORP COMMON 362320103 87,111,523 1,234,530 X 1,234,530
95,965 1,360 X 1,360
GALILEO INTERNATIONAL INC COMMON 363547100 215,550 7,200 X 7,200
64,203,963 2,144,600 X 2,144,600
1,622,762 54,205 X 54,205
GANNETT INC COMMON 364730101 41,686,594 511,100 X 511,100
GATEWAY INC. COMMON 367626108 6,190,169 85,900 X 85,900
121,786 1,690 X 1,690
Total 543,142,583
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 16
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
GENERAL DYNAMICS CORP COMMON 369550108 26,960,525 511,100 X 511,100
GENERAL ELEC CO COMMON 369604103 286,217,863 1,849,550 X 1,849,550
2,728,552 17,632 X 17,632
4,046,713 26,150 X 26,150
GENERAL INSTRUMENT CORP COMMON 370120107 340,000 4,000 X 4,000
1,045,500 12,300 X 12,300
2,601,425 30,605 X 30,605
GENERAL MTRS CORP COMMON 370442105 88,423,690 1,216,491 X 1,216,491
22,928,036 315,433 X 315,433
GENERAL MOTORS CORP COMMON 370442832 28,800 300 X 300
594,720 6,195 X 6,195
GENERAL SEMICONDUCTOR INC COMMON 370787103 218,488 15,400 X 15,400
52,995,988 3,735,400 X 3,735,400
8,813,048 621,184 X 621,184
GENTEX CORP COMMON 371901109 11,235,975 404,900 X 404,900
225,885 8,140 X 8,140
GENUINE PARTS CO COMMON 372460105 17,369 700 X 700
GEORGIA PAC CORP COMMON 373298108 135,493,365 2,669,820 X 2,669,820
42,282,616 833,155 X 833,155
GEOGRAPHIC NETWORKS AFFILIATES INCOMMON 373999994 10,000,000 100,000 X 100,000
GILLETTE CO COMMON 375766102 63,198,100 1,534,400 X 1,534,400
GLOBAL CROSSING CP CONVERT 37932J301 10,985,538 39,025 X 39,025
GOODRICH B F CO COMMON 382388106 70,125,688 2,550,025 X 2,550,025
16,767,355 609,722 X 609,722
GROUPE DANONE - SPONS ADR COMMON 399449107 55,177 1,185 X 1,185
276,814 5,945 X 5,945
GUIDANT CORP COMMON 401698105 11,096,700 236,100 X 236,100
117,500 2,500 X 2,500
HNC SOFTWARE INC COMMON 40425P107 111,386,475 1,053,300 X 1,053,300
3,318,964 31,385 X 31,385
HADCO CORP COMMON 404681108 108,859,500 2,134,500 X 2,134,500
2,443,665 47,915 X 47,915
Total 1,095,830,030
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 17
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
HALLIBURTON CO COMMON 406216101 4,862,200 120,800 X 120,800
HANGER ORTHOPEDIC GROUP INC COMMON 41043F208 6,499,000 649,900 X 649,900
581,900 58,190 X 58,190
HANOVER COMPRESSOR CO COMMON 410768105 200,075 5,300 X 5,300
643,638 17,050 X 17,050
1,810,868 47,970 X 47,970
HARLEY DAVIDSON INC COMMON 412822108 512,500 8,000 X 8,000
31,867,891 497,450 X 497,450
4,586,170 71,589 X 71,589
2,037,188 31,800 X 31,800
HARMAN INTL INDS INC COMMON 413086109 8,298,362 147,855 X 147,855
454,893 8,105 X 8,105
HARRAHS ENTMT INC COMMON 413619107 280,238 10,600 X 10,600
877,725 33,200 X 33,200
2,752,012 104,095 X 104,095
HARRIS CORP DEL COMMON 413875105 27,746,994 1,039,700 X 1,039,700
HARRIS INTERACTIVE INC COMMON 414549105 10,440,856 799,300 X 799,300
977,271 74,815 X 74,815
HARTFORD FINL SVCS GROUP INC COMMON 416515104 11,843,750 250,000 X 250,000
HASBRO INC COMMON 418056107 11,363 600 X 600
HEALTH MGMT ASSOC INC NEW COMMON 421933102 315,650 23,600 X 23,600
973,031 72,750 X 72,750
2,418,334 180,810 X 180,810
HEALTHEON CORPORATION COMMON 422209106 218,850 5,836 X 5,836
HELLENIC TELECOMMUN ORG-ADR COMMON 423325307 40,946 3,430 X 3,430
221,560 18,560 X 18,560
HEWLETT PACKARD CO COMMON 428236103 52,859,625 464,700 X 464,700
HOME DEPOT INC COMMON 437076102 28,967,813 421,350 X 421,350
717,888 10,442 X 10,442
1,454,063 21,150 X 21,150
HONEYWELL INTL COMMON 438516106 62,077,519 1,076,100 X 1,076,100
528,129 9,155 X 9,155
1,049,913 18,200 X 18,200
Total 269,128,210
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 18
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
HOUSEHOLD INTL INC COMMON 441815107 3,911,250 105,000 X 105,000
HUMANA INC COMMON 444859102 66,645,734 8,139,937 X 8,139,937
16,788,960 2,050,560 X 2,050,560
ICG COMMUNICATIONS INC COMMON 449246107 30,258,750 1,613,800 X 1,613,800
I-CABLE COMMUNICATIONS-ADR COMMON 44934B104 150,375 6,000 X 6,000
IDEC PHARMACEUTICALS CORP COMMON 449370105 412,650 4,200 X 4,200
1,021,800 10,400 X 10,400
2,743,140 27,920 X 27,920
IMS HEALTH INC COMMON 449934108 228,375 8,400 X 8,400
4,133,859 152,050 X 152,050
1,731,028 63,670 X 63,670
ISS GROUP INC COMMON 450306105 97,811,100 1,375,200 X 1,375,200
7,146,996 100,485 X 100,485
ITT EDUCATIONAL SERVICES INC COMMON 45068B109 23,201,019 1,502,900 X 1,502,900
2,825,526 183,030 X 183,030
IXL ENTERPRISES INC COMMON 450718101 59,851,200 1,078,400 X 1,078,400
ILLINOIS TOOL WKS INC COMMON 452308109 2,702,500 40,000 X 40,000
2,703 40 X 40
ILLUMINET HOLDINGS INC COMMON 452334105 16,379,000 297,800 X 297,800
1,673,925 30,435 X 30,435
INDUS INTL INC COMMON 45578L100 8,999,250 738,400 X 738,400
INFINITY BROADCASTING CORP-A COMMON 45662S102 127,150,209 3,513,650 X 3,513,650
INET TECHNOLOGIES COMMON 45662V105 28,348,288 405,700 X 405,700
2,564,762 36,705 X 36,705
INFONET SERVICES CORPORATION COMMON 45666T106 19,766,250 753,000 X 753,000
INFORMATION HOLDINGS INC COMMON 456727106 23,023,313 792,200 X 792,200
4,252,280 146,315 X 146,315
INFOUSA INC. COMMON 456818301 18,607,956 1,335,100 X 1,335,100
2,650,425 190,165 X 190,165
ING GROEP N V COMMON 456837103 100,467 1,647 X 1,647
497,394 8,154 X 8,154
Total 575,580,482
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 19
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
INSO CORP COMMON 457674109 3,828,075 118,700 X 118,700
INSIGNIA FINANCIAL GROUP INC COMMON 45767A105 9,656,938 1,111,590 X 1,111,590
1,879,098 216,299 X 216,299
INSIGHT COMMUNICATIONS INC COMMON 45768V108 21,060,413 710,900 X 710,900
2,274,163 76,765 X 76,765
INTEGRATED DEVICE TECHNOLOGY COMMON 458118106 75,611,700 2,607,300 X 2,607,300
INTEL CORP COMMON 458140100 347,580,994 4,222,700 X 4,222,700
875,393 10,635 X 10,635
2,205,975 26,800 X 26,800
INTERIM SVCS INC COMMON 45868P100 425,700 17,200 X 17,200
1,037,025 41,900 X 41,900
3,258,833 131,670 X 131,670
INTERMEDIA COMMUNICATIONS INC COMMON 458801107 20,213,550 520,800 X 520,800
INTERNATIONAL BUSINESS MACHS COMMON 459200101 117,788,713 1,091,900 X 1,091,900
225,998 2,095 X 2,095
906,150 8,400 X 8,400
INTL PAPER CO COMMON 460146103 11,288 200 X 200
INTERPUBLIC GROUP COS INC COMMON 460690100 25,434,419 440,900 X 440,900
836,757 14,505 X 14,505
1,459,494 25,300 X 25,300
INTERWOVEN INC-RESTRICTE COMMON 46114T999 33,287,878 471,166 X 471,166
INTUIT COMMON 461202103 14,996,363 250,200 X 250,200
INVENSYS PLC -SPON ADR COMMON 461204109 112,719 10,440 X 10,440
549,723 50,915 X 50,915
I2 TECHNOLOGIES INC COMMON 465754109 6,181,500 31,700 X 31,700
117,000 600 X 600
IVEX PACKAGING CORP DEL COMMON 465855104 7,605,000 760,500 X 760,500
1,641,010 164,101 X 164,101
JDS UNIPHASE CORP COMMON 46612J101 14,711,700 91,200 X 91,200
274,231 1,700 X 1,700
JDA SOFTWARE GROUP INC COMMON 46612K108 20,933,800 1,278,400 X 1,278,400
1,396,788 85,300 X 85,300
Total 738,378,385
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 20
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
JACK IN THE BOX INC COMMON 466367109 7,506,770 362,865 X 362,865
529,290 25,585 X 25,585
JOHNSON & JOHNSON COMMON 478160104 105,048,456 1,126,525 X 1,126,525
573,954 6,155 X 6,155
951,150 10,200 X 10,200
KLA-TENCORP CORP COMMON 482480100 389,813 3,500 X 3,500
70,617,319 634,050 X 634,050
2,670,216 23,975 X 23,975
KOZMO.COM, INC. COMMON 48299E959 2,520,000 1,400,000 X 1,400,000
KEANE INC COMMON 486665102 12,522,325 389,800 X 389,800
89,950 2,800 X 2,800
KEMET CORP COMMON 488360108 57,585,369 1,277,900 X 1,277,900
10,417,053 231,169 X 231,169
KENNAMETAL INC COMMON 489170100 20,175 600 X 600
KENT ELECTRS CORP COMMON 490553104 7,100,275 312,100 X 312,100
1,644,734 72,296 X 72,296
KIMBERLY CLARK CORP COMMON 494368103 112,753,328 1,723,069 X 1,723,069
27,998,939 427,873 X 427,873
KONIKKLIFKE PHILIPS ELECTRS NV SCOMMON 500472204 191,376 1,418 X 1,418
949,050 7,030 X 7,030
LCC INTERNATIONAL INC COMMON 501810105 9,103,463 456,600 X 456,600
LAM RESH CORP COMMON 512807108 58,168,688 521,400 X 521,400
LAMSON & SESSIONS CO COMMON 513696104 3,568,988 732,100 X 732,100
275,608 56,535 X 56,535
LANIER WORLDWIDE INC COMMON 51589L105 4,028,838 1,039,700 X 1,039,700
LATTICE SEMICONDUCTOR CORP COMMON 518415104 299,941,200 6,364,800 X 6,364,800
3,253,793 69,046 X 69,046
LAUDER ESTEE COS INC COMMON 518439104 X
LEARNING TREE INTL INC COMMON 522015106 20,412,000 729,000 X 729,000
2,163,336 77,262 X 77,262
LEXMARK INTL GROUP INC COMMON 529771107 173,950,050 1,922,100 X 1,922,100
Total 996,945,502
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 21
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
LIBERTY FINL COS INC COMMON 530512102 6,094,035 265,680 X 265,680
407,829 17,780 X 17,780
LILLY ELI & CO COMMON 532457108 24,871,000 374,000 X 374,000
901,740 13,560 X 13,560
1,762,250 26,500 X 26,500
LIMITED INC COMMON 532716107 14,093,888 325,400 X 325,400
278,499 6,430 X 6,430
LINCARE HLDGS INC COMMON 532791100 249,750 7,200 X 7,200
851,578 24,550 X 24,550
1,939,898 55,925 X 55,925
LINCOLN NATL CORP IND COMMON 534187109 14,800,000 370,000 X 370,000
LINEAR TECHNOLOGY CORP COMMON 535678106 393,594 5,500 X 5,500
91,134,844 1,273,500 X 1,273,500
2,844,252 39,745 X 39,745
LIZ CLAIBORNE INC COMMON 539320101 11,288 300 X 300
LOEHMANNS INC NEW COMMON 540417102 59,438 1,170,470 X 1,170,470
3,345 65,870 X 65,870
LUCENT TECHNOLOGIES INC COMMON 549463107 113,917,500 1,518,900 X 1,518,900
1,136,625 15,155 X 15,155
2,557,500 34,100 X 34,100
MBNA CORP COMMON 55262L100 5,811,390 213,262 X 213,262
MCI WORLDCOM INC COMMON 55268B106 185,007,713 3,486,600 X 3,486,600
1,683,275 31,723 X 31,723
3,334,978 62,850 X 62,850
MSC INDL DIRECT INC COMMON 553530106 1,819,225 137,300 X 137,300
520,725 39,300 X 39,300
MACROMEDIA INC COMMON 556100105 85,212,563 1,165,300 X 1,165,300
MATAV RT- MAGYAR TAVKOZLESI COMMON 559776109 90,720 2,520 X 2,520
477,792 13,272 X 13,272
MANNESMANN A G COMMON 563775303 303,664 1,265 X 1,265
1,449,907 6,040 X 6,040
MANOR CARE INC COMMON 564055101 168,000 10,500 X 10,500
473,600 29,600 X 29,600
Total 564,662,402
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 22
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
1,282,000 80,125 X 80,125
MANUGISTICS GROUP INC COMMON 565011103 962,913 29,800 X 29,800
10,550,031 326,500 X 326,500
7,438,984 230,220 X 230,220
MARINE DRILLING COS INC COMMON 568240204 9,129,325 406,878 X 406,878
658,989 29,370 X 29,370
MARTHA STEWART LIVING - CL A COMMON 573083102 2,928,000 122,000 X 122,000
MASTECH CORP COMMON 57632N105 16,270,650 657,400 X 657,400
MAXIM INTEGRATED PRODS INC COMMON 57772K101 547,375 11,600 X 11,600
54,699,750 1,159,200 X 1,159,200
4,114,042 87,185 X 87,185
MAXYGEN COMMON 577776107 21,143,800 297,800 X 297,800
156,200 2,200 X 2,200
MAY DEPT STORES CO COMMON 577778103 49,471,500 1,534,000 X 1,534,000
MCDONALDS CORP COMMON 580135101 14,887,406 369,300 X 369,300
MCKESSON HBOC INC COMMON 58155Q103 9,848,250 437,700 X 437,700
341,325 15,170 X 15,170
686,250 30,500 X 30,500
MEAD CORP COMMON 582834107 60,279,956 1,387,740 X 1,387,740
82,097 1,890 X 1,890
MEDIAONE GROUP INC COMMON 58440J104 176,184,831 2,293,700 X 2,293,700
MEDIAPLEX INC COMMON 58446B105 3,915,600 62,400 X 62,400
MEDICALOGIC INC COMMON 584642102 6,358,800 302,800 X 302,800
670,425 31,925 X 31,925
MEDICIS PHARMACEUTICAL CORP COMMON 584690309 344,756 8,100 X 8,100
1,059,806 24,900 X 24,900
2,635,257 61,915 X 61,915
MEDSCAPE INC COMMON 585046105 3,590,000 359,000 X 359,000
MEDTRONIC INC COMMON 585055106 138,835,401 3,810,234 X 3,810,234
30,045,561 824,578 X 824,578
1,690,700 46,400 X 46,400
MELLON FINANCIAL COMMON 58551A108 65,621,406 1,926,500 X 1,926,500
Total 696,431,388
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 23
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
MEMBERWORKS INC COMMON 586002107 73,716,075 2,221,200 X 2,221,200
9,786,828 294,895 X 294,895
MERCK & CO INC COMMON 589331107 96,380,469 1,434,500 X 1,434,500
1,266,686 18,853 X 18,853
1,101,875 16,400 X 16,400
MERRILL LYNCH & CO INC COMMON 590188108 61,184,700 734,400 X 734,400
METAMOR WORLDWIDE INC COMMON 59133P100 299,988 10,300 X 10,300
34,156,344 1,172,750 X 1,172,750
7,165,187 246,015 X 246,015
METRIS COS INC COMMON 591598107 43,499,494 1,218,900 X 1,218,900
4,905,604 137,460 X 137,460
METRO GOLDWYN MAYER INC COMMON 591610100 164,938 7,000 X 7,000
5,593,738 237,400 X 237,400
1,255,410 53,280 X 53,280
METROMEDIA FIBER NETWORK INC COMMON 591689104 9,587,500 200,000 X 200,000
MICROSOFT CORP COMMON 594918104 811,768,588 6,953,050 X 6,953,050
3,203,737 27,441 X 27,441
7,180,125 61,500 X 61,500
MICROCHIP TECHNOLOGY INC COMMON 595017104 465,375 6,800 X 6,800
242,056,594 3,536,900 X 3,536,900
9,762,473 142,648 X 142,648
MICRON TECHNOLOGY INC COMMON 595112103 201,854,550 2,596,200 X 2,596,200
619,668 7,970 X 7,970
1,640,525 21,100 X 21,100
MIDCOAST ENERGY RESOURCES COMMON 59563W104 6,940,848 414,379 X 414,379
361,046 21,555 X 21,555
MINERALS TECHNOLOGIES INC COMMON 603158106 3,357,238 83,800 X 83,800
MOBIUS MANAGEMENT SOLUTIONS COMMON 606925105 3,020,219 380,500 X 380,500
MODIS PROFESSIONAL SERVICES INC COMMON 607830106 68,732,025 4,823,300 X 4,823,300
4,018,286 281,985 X 281,985
MOLEX INC COMMON 608554101 7,984,434 140,850 X 140,850
161,843 2,855 X 2,855
MONSANTO CO COMMON 611662107 488,683 13,790 X 13,790
Total 1,723,681,088
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 24
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
MORGAN J P & CO INC COMMON 616880100 48,946,894 386,550 X 386,550
MOTOROLA INC COMMON 620076109 44,844,988 304,550 X 304,550
1,731,660 11,760 X 11,760
3,224,775 21,900 X 21,900
MP3.COM INC COMMON 62473M109 4,749,956 149,900 X 149,900
644,524 20,340 X 20,340
MUELLER INDS INC COMMON 624756102 7,811,513 215,490 X 215,490
490,100 13,520 X 13,520
NBC INTERNET INC-A COMMON 62873D105 9,710,325 125,700 X 125,700
186,559 2,415 X 2,415
NDS GROUP PLC-SPONSORED ADR COMMON 628891103 366,000 12,000 X 12,000
NFO WORLDWIDE INC COMMON 62910N108 17,770,225 794,200 X 794,200
2,295,765 102,604 X 102,604
NTL INC CONVERT 629407AN7 43,000,000 40,000,000 X 40,000,000
NTT MOBILE COMM NTWK-SP ADR COMMON 629424508 286,051 1,490 X 1,490
1,487,849 7,750 X 7,750
NABISCO GROUP HOLDINGS COMMON 62952P102 6,375 600 X 600
NATIONAL EQUIPMENT SERVICES COMMON 635847106 6,514,375 1,042,300 X 1,042,300
982,406 157,185 X 157,185
NATIONAL INSTRS CORP COMMON 636518102 441,788 11,550 X 11,550
13,135,050 343,400 X 343,400
3,112,211 81,365 X 81,365
NATIONAL SEMICONDUCTOR CORP COMMON 637640103 66,945,906 1,563,700 X 1,563,700
NATIONWIDE FINL SVCS INC COMMON 638612101 310,106 11,100 X 11,100
894,000 32,000 X 32,000
2,301,910 82,395 X 82,395
NAVIGANT CONSULTING CO COMMON 63935N107 123,975 11,400 X 11,400
55,063,931 5,063,350 X 5,063,350
931,716 85,675 X 85,675
NETRADIO CORPORATION COMMON 64114E108 3,300,000 400,000 X 400,000
NETIQ CORP COMMON 64115P102 5,206,250 100,000 X 100,000
NETSCOUT SYSTEMS INC COMMON 64115T104 11,925,700 384,700 X 384,700
Total 358,742,881
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 25
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
86,800 2,800 X 2,800
NETWORK APPLIANCE INC COMMON 64120L104 2,907,188 35,000 X 35,000
54,821 660 X 660
NETWORK ACCESS SOLUTIONS CORPORATCOMMON 64120S109 18,219,300 552,100 X 552,100
1,126,125 34,125 X 34,125
NEW ERA OF NETWORKS INC COMMON 644312100 13,706,475 287,800 X 287,800
NEWELL RUBBERMAID INC COMMON 651229106 27,609,450 952,050 X 952,050
749,795 25,855 X 25,855
1,441,300 49,700 X 49,700
NIPPON TELEG & TEL CORP COMMON 654624105 286,366 3,325 X 3,325
1,459,388 16,945 X 16,945
NOKIA CORP-SPONSORED ADR A COMMON 654902204 34,505,888 180,600 X 180,600
1,624,031 8,500 X 8,500
2,674,875 14,000 X 14,000
NORFOLK SOUTHERN CORP COMMON 655844108 8,200 400 X 400
NORTEL NETWORKS CORPORATION COMMON 656569100 56,358,001 558,000 X 558,000
NOVA CORP GA COMMON 669784100 498,688 15,800 X 15,800
85,365,863 2,704,661 X 2,704,661
14,029,405 444,496 X 444,496
NOVARTIS A G COMMON 66987V109 81,060 1,110 X 1,110
405,156 5,548 X 5,548
NOVELLUS SYS INC COMMON 670008101 353,294,353 2,883,300 X 2,883,300
NOVEN PHARMACEUTICALS INC COMMON 670009109 2,890,938 159,500 X 159,500
NUCOR CORP COMMON 670346105 11,324,263 206,600 X 206,600
239,531 4,370 X 4,370
OM GROUP INC COMMON 670872100 4,786,813 139,000 X 139,000
OAK INDS INC COMMON 671400505 77,779,013 732,900 X 732,900
OLYMPIC STEEL INC COMMON 68162K106 4,047,499 852,105 X 852,105
190,238 40,050 X 40,050
OMNICARE INC COMMON 681904108 193,200 16,100 X 16,100
36,891,000 3,074,250 X 3,074,250
6,155,148 512,929 X 512,929
Total 760,990,167
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 26
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
ONDISPLAY INC COMMON 68232L100 118,138 1,300 X 1,300
299,888 3,300 X 3,300
936,013 10,300 X 10,300
ORACLE CORP COMMON 68389X105 33,517,894 299,100 X 299,100
1,169,933 10,440 X 10,440
2,375,725 21,200 X 21,200
OUTBACK STEAKHOUSE INC COMMON 689899102 5,057,813 195,000 X 195,000
P-COM INC COMMON 693262107 118,506 13,400 X 13,400
289,191 32,700 X 32,700
915,328 103,500 X 103,500
PE CORP-PE BIOSYSTEMS GROUP COMMON 69332S102 8,915,156 74,100 X 74,100
156,406 1,300 X 1,300
PE CORP-CELERA GENOMICS GRP COMMON 69332S201 75 1 X 1
PMC-SIERRA INC COMMON 69344F106 35,910,000 224,000 X 224,000
4,778,916 29,810 X 29,810
PSS WORLD MEDICAL INC COMMON 69366A100 213,288 22,600 X 22,600
40,014,056 4,239,900 X 4,239,900
5,891,709 624,287 X 624,287
PACIFIC GATEWAY EXCHANGE INC COMMON 694327107 14,673,750 860,000 X 860,000
PACTIV CORPORATION COMMON 695257105 2,125 200 X 200
PANAMSAT CORP NEW COMMON 697933109 6,014,688 101,300 X 101,300
PARAMETRIC TECHNOLOGY CORP COMMON 699173100 289,831,256 10,709,700 X 10,709,700
PEGASUS COMMUNICATIONS CORP COMMON 705904100 9,149,400 93,600 X 93,600
705904308 4,515,750 4,050 X 4,050
PENINSULAR & ORIENTAL-SP ADR COMMON 707190401 101,398 3,060 X 3,060
520,677 15,713 X 15,713
PENTON MEDIA INC COMMON 709668107 386,400 16,100 X 16,100
5,184,000 216,000 X 216,000
3,877,080 161,545 X 161,545
PEPSICO INC COMMON 713448108 70,325,513 1,995,050 X 1,995,050
81,040 2,299 X 2,299
PEREGRINE SYSTEMS INC COMMON 71366Q101 547,219 6,500 X 6,500
Total 545,888,327
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 27
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
54,763,969 650,500 X 650,500
4,141,604 49,195 X 49,195
PERFORMANCE FOOD GROUP CO COMMON 713755106 16,974,750 696,400 X 696,400
3,672,971 150,686 X 150,686
PERSONNEL GROUP AMER INC COMMON 715338109 28,005,050 2,732,200 X 2,732,200
4,420,261 431,245 X 431,245
PFIZER INC COMMON 717081103 61,470,684 1,895,050 X 1,895,050
863,259 26,613 X 26,613
1,686,750 52,000 X 52,000
PHARMACOPEIA INC COMMON 71713B104 8,781,554 388,135 X 388,135
395,485 17,480 X 17,480
PHILIP MORRIS COS INC COMMON 718154107 99,126,665 4,309,855 X 4,309,855
17,709,264 769,968 X 769,968
PHOTON DYNAMICS INC COMMON 719364101 16,844,625 434,700 X 434,700
1,774,944 45,805 X 45,805
PITNEY BOWES INC COMMON 724479100 123,143,731 2,548,900 X 2,548,900
PITTSTON BAX GROUP COMMON 725701882 7,514,531 707,250 X 707,250
453,688 42,700 X 42,700
PLUG POWER INC. COMMON 72919P103 401,150 14,200 X 14,200
POGO PRODUCING CO COMMON 730448107 13,185,070 647,120 X 647,120
1,976,538 97,008 X 97,008
PRAXAIR INC COMMON 74005P104 7,028,656 139,700 X 139,700
138,108 2,745 X 2,745
PRE PAID LEGAL SVCS INC COMMON 740065107 17,236,800 718,200 X 718,200
2,299,632 95,818 X 95,818
PREMIER PKS INC COMMON 740540208 66,588,638 2,306,100 X 2,306,100
9,226,977 319,549 X 319,549
PREVIEW SYSTEMS INC COMMON 741379101 6,487,500 100,000 X 100,000
PRICE COMMUNICATIONS CORP COMMON 741437305 37,642,533 1,353,439 X 1,353,439
PRICE T ROWE & ASSOCIATES COMMON 741477103 217,931 5,900 X 5,900
727,669 19,700 X 19,700
1,810,492 49,015 X 49,015
PRICELINE.COM INC COMMON 741503106 13,478,188 284,500 X 284,500
Total 630,189,667
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 28
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
PRIMARK CORP COMMON 741903108 25,882,313 930,600 X 930,600
3,407,003 122,499 X 122,499
PRIDE INTL INC COMMON 741932107 13,082,063 894,500 X 894,500
1,330,656 90,985 X 90,985
PRIORITY HEALTHCARE CORP COMMON 74264T102 14,390,619 497,300 X 497,300
2,073,083 71,640 X 71,640
PROCTER & GAMBLE CO COMMON 742718109 134,613,966 1,228,650 X 1,228,650
1,336,991 12,203 X 12,203
2,640,456 24,100 X 24,100
PROFESSIONAL DETAILING INC COMMON 74312N107 20,830,513 695,800 X 695,800
PROFIT RECOVERY GROUP INTL INC COMMON 743168106 10,111,002 380,650 X 380,650
1,890,480 71,171 X 71,171
PROVANT INC COMMON 743724106 15,672,675 620,700 X 620,700
PROVANTAGE HEALTH SERVICES COMMON 743725103 4,497,350 503,200 X 503,200
595,595 66,640 X 66,640
PROVINCE HEALTHCARE CO COMMON 743977100 22,332,410 1,175,390 X 1,175,390
3,328,439 175,181 X 175,181
PSINET INC COMMON 74437C101 38,056,525 616,300 X 616,300
QLT PHOTOTHERAPEUTICS INC. COMMON 746927102 505,250 8,600 X 8,600
11,808,750 201,000 X 201,000
5,649,106 96,155 X 96,155
QRS CORP COMMON 74726X105 241,500 2,300 X 2,300
588,000 5,600 X 5,600
1,896,300 18,060 X 18,060
QUALCOMM INC COMMON 747525103 11,342,450 64,400 X 64,400
522,563 2,967 X 2,967
774,950 4,400 X 4,400
QUEST SOFTWARE INC COMMON 74834T103 173,400 1,700 X 1,700
408,000 4,000 X 4,000
1,259,700 12,350 X 12,350
QUINTILES TRANSNATIONAL CORP COMMON 748767100 5,015,725 268,400 X 268,400
97,175 5,200 X 5,200
QWEST COMMUNICATIONS INTL COMMON 749121109 22,420,200 521,400 X 521,400
Total 378,775,206
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 29
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
RWE AG COMMON 74975E303 39 1 X 1
RATIONAL SOFTWARE CORP COMMON 75409P202 178,819,913 3,640,100 X 3,640,100
187,166 3,810 X 3,810
RAYTHEON CO COMMON 755111309 3,077 124 X 124
755111408 44,683,836 1,682,215 X 1,682,215
18,992 715 X 715
READERS DIGEST ASSN INC COMMON 755267101 7,643,025 261,300 X 261,300
201,679 6,895 X 6,895
REMEDY CORP COMMON 759548100 819,588 17,300 X 17,300
1,989,750 42,000 X 42,000
5,888,476 124,295 X 124,295
RENEX CORP COMMON 759683105 699,369 75,100 X 75,100
RENT-A-CENTER INC COMMON 76009N100 11,400,113 575,400 X 575,400
1,440,963 72,730 X 72,730
RENT WAY INC COMMON 76009U104 9,005,189 481,883 X 481,883
687,420 36,785 X 36,785
RJ REYNOLDS TOBACCO HOLDINGS, INCCOMMON 76182K105 3,525 200 X 200
RITCHIE BROS. AUCTIONEERS COMMON 767744105 10,719,825 386,300 X 386,300
2,569,428 92,592 X 92,592
ROCHE HOLDINGS LTD COMMON 771195104 153,491 1,300 X 1,300
754,469 6,390 X 6,390
ROGERS COMMUNICATIONS - CL B COMMON 775109200 319,275 12,900 X 12,900
64,498,500 2,606,000 X 2,606,000
2,365,976 95,595 X 95,595
ROSS STORES INC COMMON 778296103 184,756 10,300 X 10,300
574,000 32,000 X 32,000
1,411,412 78,685 X 78,685
ROYAL BANK OF CANADA COMMON 780087102 1,986 45 X 45
84,941 1,925 X 1,925
ROYAL DUTCH PETE CO COMMON 780257804 89,687,006 1,480,900 X 1,480,900
ROYAL OAK MINES INC COMMON 78051D105 32 8,204 X 8,204
ROYAL OAK MINES COMMON 78051D998 390 39,007 X 39,007
Total 436,817,605
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 30
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
RUDOLPH TECHNOLOGIES INC COMMON 781270103 9,483,850 283,100 X 283,100
SBC COMMUNICATIONS INC COMMON 78387G103 118,173,422 2,424,070 X 2,424,070
SCI SYS INC COMMON 783890106 237,308,188 2,887,400 X 2,887,400
SM&A CORPORATION COMMON 784432106 6,978,825 1,139,400 X 1,139,400
1,273,345 207,893 X 207,893
SPX CORP COMMON 784635104 11,152 138 X 138
SAFEWAY INC COMMON 786514208 81,072,599 2,267,765 X 2,267,765
23,220,662 649,529 X 649,529
ST PAUL COS INC COMMON 792860108 96,756,665 2,872,183 X 2,872,183
28,663,346 850,860 X 850,860
SANMINA CORP COMMON 800907107 239,700 2,400 X 2,400
579,275 5,800 X 5,800
1,715,853 17,180 X 17,180
SANTA FE SNYDER CORP COMMON 80218K105 5,188,800 648,600 X 648,600
SAP AG-SPONSORED ADR COMMON 803054204 1,056,869 20,300 X 20,300
SARA LEE CORP COMMON 803111103 55,270,534 2,505,180 X 2,505,180
73,027 3,310 X 3,310
SCHEIN PHARMACEUTICAL INC COMMON 806416103 6,768,175 558,200 X 558,200
640,430 52,819 X 52,819
SCHERING PLOUGH CORP COMMON 806605101 52,528,050 1,239,600 X 1,239,600
526,298 12,420 X 12,420
SCHLUMBERGER LTD COMMON 806857108 83,255,825 1,483,400 X 1,483,400
1,190,131 21,205 X 21,205
1,824,063 32,500 X 32,500
SCHOLASTIC CORP COMMON 807066105 199,000 3,200 X 3,200
478,844 7,700 X 7,700
1,521,417 24,465 X 24,465
SCHWEITZER-MAUDUIT INTL INC COMMON 808541106 9,406 700 X 700
SCIQUEST.COM INC COMMON 80908Q107 23,905,650 300,700 X 300,700
166,950 2,100 X 2,100
SEARS ROEBUCK & CO COMMON 812387108 1,519 50 X 50
Total 840,081,867
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 31
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
SENSORMATIC ELECTRS CORP COMMON 817265101 38,250,900 2,193,600 X 2,193,600
SHERWIN WILLIAMS CO COMMON 824348106 14,700 700 X 700
SHIRE PHARMACEUTICALS-ADR COMMON 82481R106 320,375 11,000 X 11,000
932,000 32,000 X 32,000
2,473,149 84,915 X 84,915
SIEBEL SYS INC COMMON 826170102 22,738,800 270,700 X 270,700
466,620 5,555 X 5,555
554,400 6,600 X 6,600
SITEL CORP COMMON 82980K107 7,665,000 1,095,000 X 1,095,000
1,151,780 164,540 X 164,540
SMITHKLINE BEECHAM COMMON 832378301 138,189 2,155 X 2,155
687,741 10,725 X 10,725
SNYDER COMMUNICATIONS INC COMMON 832914105 537,075 27,900 X 27,900
1,654,538 85,950 X 85,950
4,139,231 215,025 X 215,025
SOCIETE GENERALE FRANCE COMMON 83364L109 122,949 2,655 X 2,655
637,438 13,765 X 13,765
SOFTWARE.COM INC COMMON 83402P104 7,603,200 79,200 X 79,200
150,720 1,570 X 1,570
SOMERA COMMUNICATIONS INC COMMON 834458101 4,106,863 330,200 X 330,200
SOUTHTRUST CORP COMMON 844730101 347,875 9,200 X 9,200
7,120,888 188,321 X 188,321
2,681,852 70,925 X 70,925
SPLITROCK SERVICES INC. COMMON 848636304 588,936 29,632 X 29,632
STAGE STORES INC COMMON 85254C107 3,867,795 1,672,560 X 1,672,560
172,767 74,710 X 74,710
STATE STR CORP COMMON 857477103 51,144 700 X 700
STEWART & STEVENSON SVCS INC COMMON 860342104 7,545,025 637,047 X 637,047
376,098 31,755 X 31,755
STRUCTURAL DYNAMICS RESH CORP COMMON 863555108 18,886,575 1,481,300 X 1,481,300
2,816,921 220,935 X 220,935
SUMMIT BANCORP COMMON 866005101 95,534,841 3,119,505 X 3,119,505
Total 234,336,384
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 32
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
25,053,118 818,061 X 818,061
SUN MICROSYSTEMS INC COMMON 866810104 11,151,000 144,000 X 144,000
389,511 5,030 X 5,030
789,863 10,200 X 10,200
SUNGARD DATA SYS INC COMMON 867363103 482,125 20,300 X 20,300
168,683,948 7,102,482 X 7,102,482
7,286,001 306,779 X 306,779
SYBASE INC COMMON 871130100 401,200 23,600 X 23,600
977,500 57,500 X 57,500
3,024,810 177,930 X 177,930
SYBRON INTL CORP COMMON 87114F106 345,625 14,000 X 14,000
844,313 34,200 X 34,200
2,560,711 103,725 X 103,725
SYMANTEC CORP COMMON 871503108 270,988,200 4,622,400 X 4,622,400
SYMBOL TECHNOLOGIES INC COMMON 871508107 19,682,128 309,650 X 309,650
388,367 6,110 X 6,110
SYNOPSYS INC COMMON 871607107 547,350 8,200 X 8,200
368,500,050 5,520,600 X 5,520,600
3,725,318 55,810 X 55,810
TDK CORP-SPONSORED ADR COMMON 872351408 127,870 945 X 945
634,616 4,690 X 4,690
T&HQ INC COMMON 872443403 12,569,944 542,100 X 542,100
1,322,290 57,026 X 57,026
TJX COS INC NEW COMMON 872540109 4,353,188 213,000 X 213,000
TSI INTL SOFTWARE LTD COMMON 872879101 12,032,813 212,500 X 212,500
TV GUIDE INC - CL A COMMON 87307Q109 335,400 7,800 X 7,800
14,430,800 335,600 X 335,600
2,613,325 60,775 X 60,775
TANDY CORP COMMON 875382103 110,717,128 2,250,920 X 2,250,920
32,189,284 654,420 X 654,420
TEKELEC COMMON 879101103 25,398,000 1,128,800 X 1,128,800
2,705,400 120,240 X 120,240
TELEFONICA DE ESPANA S A COMMON 879382208 239,157 3,035 X 3,035
1,183,582 15,018 X 15,018
Total 1,106,673,932
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 33
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
TELEMATE.NET SOFTWARE INC COMMON 87943L100 7,249,125 446,100 X 446,100
TELESPECTRUM WORLDWIDE INC COMMON 87951U109 3,495,525 490,600 X 490,600
393,692 55,255 X 55,255
TELSTRA CORP-ADR (FINAL) COMMON 87969N204 93,740 3,440 X 3,440
460,798 16,910 X 16,910
TENNECO AUTOMOTIVE COMMON 880349105 373 40 X 40
TERADYNE INC COMMON 880770102 215,569,200 3,266,200 X 3,266,200
TEVA PHARMACEUTICAL-SP ADR COMMON 881624209 19,140,563 267,000 X 267,000
TEXACO INC COMMON 881694103 86,749,717 1,597,233 X 1,597,233
23,487,278 432,447 X 432,447
3DO CO COMMON 88553W105 35,193,722 3,870,100 X 3,870,100
TIFFANY & CO NEW COMMON 886547108 169,575 1,900 X 1,900
419,475 4,700 X 4,700
1,312,421 14,705 X 14,705
TIME WARNER INC COMMON 887315109 13,092,178 181,050 X 181,050
TITAN CORPORATION COMMON 888266103 298,069 6,300 X 6,300
719,150 15,200 X 15,200
2,289,925 48,400 X 48,400
TOTAL RENAL CARE HLDGS INC COMMON 89151A107 133,750 20,000 X 20,000
20,027,257 2,994,730 X 2,994,730
3,696,108 552,689 X 552,689
TOTAL FINA SA SPON ADR COMMON 89151E109 146,048 2,109 X 2,109
694,855 10,034 X 10,034
TRANS WORLD ENTMT CORP COMMON 89336Q100 6,363,420 606,040 X 606,040
443,415 42,230 X 42,230
TRANSACTION SYS ARCHITECTS COMMON 893416107 263,200 9,400 X 9,400
10,473,400 374,050 X 374,050
2,009,560 71,770 X 71,770
TRANSWITCH CORP COMMON 894065101 11,203,650 154,400 X 154,400
1,222,678 16,850 X 16,850
TRIANGLE PHARMACEUTICALS INC COMMON 89589H104 2,076,906 162,100 X 162,100
TRICON GLOBAL RESTAURANTS COMMON 895953107 3,090 80 X 80
Total 468,891,861
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 34
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
TRIBUNE CO NEW COMMON 896047107 33,038 600 X 600
TRUE NORTH COMMUNICATIONS INC COMMON 897844106 7,461,695 166,975 X 166,975
479,273 10,725 X 10,725
TYCO INTL LTD NEW COMMON 902124106 46,753,512 1,198,808 X 1,198,808
1,414,725 36,275 X 36,275
3,120,000 80,000 X 80,000
UCAR INTL INC COMMON 90262K109 28,424,297 1,595,750 X 1,595,750
3,975,216 223,170 X 223,170
UST INC COMMON 902911106 10,075 400 X 400
USA NETWORKS INC COMMON 902984103 69,112,225 1,250,900 X 1,250,900
U S FOODSERVICE COMMON 90331R101 262,975 15,700 X 15,700
63,910,463 3,815,550 X 3,815,550
10,533,522 628,867 X 628,867
UNILEVER N V COMMON 904784709 29,233 537 X 537
UNICOM CORP COMMON 904911104 49,801,100 1,486,600 X 1,486,600
UNIGRAPHICS SOLUTIONS INC COMMON 904928108 6,542,100 242,300 X 242,300
UNION PAC RES GROUP INC COMMON 907834105 7,650 600 X 600
UNITED HEALTHCARE CORP COMMON 910581107 85,371,078 1,606,985 X 1,606,985
17,065,078 321,225 X 321,225
UNITED PARCEL SERVICE - CL B COMMON 911312106 9,487,500 137,500 X 137,500
UNITED RENTALS INC COMMON 911363109 191,800 11,200 X 11,200
4,852,369 283,350 X 283,350
1,443,552 84,295 X 84,295
UNITED TECHNOLOGIES CORP COMMON 913017109 275,402,205 4,236,957 X 4,236,957
37,200,150 572,310 X 572,310
UNIVERSAL STAINLESS & ALLOY COMMON 913837100 3,790,125 561,500 X 561,500
199,564 29,565 X 29,565
UNIVISION COMMUNICATIONS INC COMMON 914906102 296,344 2,900 X 2,900
11,884,406 116,300 X 116,300
2,243,016 21,950 X 21,950
URBAN OUTFITTERS INC COMMON 917047102 7,226,495 248,120 X 248,120
Total 748,524,780
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 35
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
328,821 11,290 X 11,290
USWEB CORP COMMON 917327108 9,176,344 206,500 X 206,500
VALASSIS COMMUNICATIONS INC COMMON 918866104 392,925 9,300 X 9,300
1,206,238 28,550 X 28,550
2,819,343 66,730 X 66,730
VALERO ENERGY CORP NEW COMMON 91913Y100 9,353,771 470,630 X 470,630
580,748 29,220 X 29,220
VARIAN SEMICONDUCTOR EQUIP COMMON 922207105 431,800 12,700 X 12,700
1,047,200 30,800 X 30,800
3,184,270 93,655 X 93,655
VEECO INSTRS INC DEL COMMON 922417100 20,990,725 448,400 X 448,400
2,875,926 61,435 X 61,435
VENTIV HEALTH INC COMMON 922793104 X
- X -
X
VERIO INC COMMON 923433106 9,911,838 214,600 X 214,600
VERIO INC. CONVERT 923433304 5,367,500 95,000 X 95,000
VERITAS SOFTWARE CO COMMON 923436109 17,389,688 121,500 X 121,500
678,985 4,744 X 4,744
493,781 3,450 X 3,450
VERISIGN COMMON 92343E102 7,484,750 39,200 X 39,200
160,388 840 X 840
VERTICALNET INC COMMON 92532L107 32,373,600 197,400 X 197,400
3,338,220 20,355 X 20,355
VIATEL INC COMMON 925529208 429 8 X 8
VIGNETTE CORPORATION COMMON 926734104 11,784,900 72,300 X 72,300
242,870 1,490 X 1,490
VISIO CORP COMMON 927914101 132,577,250 2,791,100 X 2,791,100
4,397,313 92,575 X 92,575
VISHAY INTERTECHNOLOGY INC COMMON 928298108 X
VISUAL NETWORKS INC COMMON 928444108 19,558,900 246,800 X 246,800
1,976,099 24,935 X 24,935
VITESSE SEMICONDUCTOR CORP COMMON 928497106 11,011,875 210,000 X 210,000
Total 311,136,494
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 36
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
214,994 4,100 X 4,100
VIVENDI (EX-GEN EAUX) SP ADR COMMON 92851S105 116,553 6,485 X 6,485
591,570 32,915 X 32,915
WPP GROUP PLC COMMON 929309300 311,719 3,750 X 3,750
1,560,339 18,771 X 18,771
WABASH NATL CORP COMMON 929566107 15 1 X 1
WAL MART STORES INC COMMON 931142103 222,801,626 3,223,170 X 3,223,170
2,388,891 34,559 X 34,559
4,541,513 65,700 X 65,700
WASHINGTON MUT INC COMMON 939322103 73,455,632 2,838,865 X 2,838,865
19,402,498 749,855 X 749,855
WASTE CONECTIONS INC COMMON 941053100 609,263 42,200 X 42,200
WATSON PHARMACEUTICALS INC COMMON 942683103 6,790,050 189,600 X 189,600
132,685 3,705 X 3,705
WEATHERFORD INTERNATIONAL COMMON 947074100 11,210,456 280,700 X 280,700
219,656 5,500 X 5,500
WEBVAN GROUP INC COMMON 94845V103 4,207,500 255,000 X 255,000
WELLS FARGO CO COMMON 949746101 15,798,931 390,700 X 390,700
468,428 11,584 X 11,584
938,150 23,200 X 23,200
WESTWOOD ONE INC COMMON 961815107 10,290,400 135,400 X 135,400
WET SEAL INC COMMON 961840105 3,163,942 258,281 X 258,281
250,574 20,455 X 20,455
WILLIAMS COS INC DEL COMMON 969457100 90,654,488 2,966,200 X 2,966,200
WILLIAMS-SONOMA INC COMMON 969904101 285,200 6,200 X 6,200
5,991,500 130,250 X 130,250
2,270,100 49,350 X 49,350
WILMAR INDS INC COMMON 971426101 5,940,513 341,900 X 341,900
WIND RIVER SYSTEMS INC COMMON 973149107 9,163,575 250,200 X 250,200
WINDMERE-DURABLE HLDGS INC COMMON 973411101 9,924,124 583,772 X 583,772
695,980 40,940 X 40,940
WORLD ACCESS INC COMMON 98141A101 1,900,225 98,713 X 98,713
Total 506,291,089
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 37
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
XM SATELLITE RADIO HOLDINGS COMMON 983759101 7,041,688 184,700 X 184,700
XILINX INC COMMON 983919101 55,476,422 1,220,100 X 1,220,100
469,010 10,315 X 10,315
845,719 18,600 X 18,600
XIRCOM INC COMMON 983922105 133,072,500 1,774,300 X 1,774,300
XEROX CORP COMMON 984121103 17,349,948 764,736 X 764,736
19,398 855 X 855
XPEDIOR INCORPORATED COMMON 98413B100 25,357,500 882,000 X 882,000
186,875 6,500 X 6,500
YAHOO INC COMMON 984332106 22,759,363 52,600 X 52,600
2,005,507 4,635 X 4,635
1,644,213 3,800 X 3,800
YOUNG & RUBICAM INC COMMON 987425105 3,155,450 44,600 X 44,600
141,500 2,000 X 2,000
YUPI INTERNET INC SER C COMMON 988996997 7,000,004 608,696 X 608,696
ZEBRA TECHNOLOGIES CORP COMMON 989207105 27,717,300 473,800 X 473,800
7,708,194 131,764 X 131,764
ZIFF-DAVIS INC COMMON 989511100 40,949,631 2,589,700 X 2,589,700
ZIFF DAVIS INC - ZDNET COMMON 989511209 13,666,800 650,800 X 650,800
DAIMLERCHRYSLER AG COMMON D1668R123 57,860,244 741,798 X 741,798
ACE LTD COMMON G0070K103 6,364,613 381,400 X 381,400
122,570 7,345 X 7,345
AMDOCS LTD COMMON G02602103 74,906,400 2,171,200 X 2,171,200
FRESH DEL MONTE PRODUCE INC COMMON G36738105 3,801,330 422,370 X 422,370
176,355 19,595 X 19,595
GLOBAL CROSSING LTD COMMON G3921A100 26,065,000 521,300 X 521,300
RENAISSANCE RE HLDGS LTD COMMON G7496G103 7,965,720 194,880 X 194,880
599,841 14,675 X 14,675
HILFIGER TOMMY CORP COMMON G8915Z102 21,038 900 X 900
TRANSOCEAN SEDCO FOREX INC COMMON G90078109 212,875 6,500 X 6,500
Total 544,663,004
<PAGE>
12/31/1999 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 38
ITEM 1: ITEM 2: ITEM 3: ITEM 4: ITEM 5: ITEM 6: ITEM 7: ITEM 8:
SHARES OR INVST DISCRET V O T I N G A U T H O R I T Y
TITLE CUSIP FAIR MARKET PRINCIPAL SOLE OTHR (S H A R E S)
NAME OF ISSUER OF CLASS NUMBER VALUE AMOUNT SHRD MGRS (A)SOLE (B)SHARED (C)NONE
10,643,030 324,978 X 324,978
1,662,870 50,775 X 50,775
206,063 6,292 X 6,292
SBS BROADCASTING SA COMMON L8137F102 340,813 7,000 X 7,000
29,677,466 609,550 X 609,550
7,072,103 145,255 X 145,255
CHECK POINT SOFTWARE TECH LTD COMMON M22465104 452,931,375 2,278,900 X 2,278,900
GILAT SATELLITE NETWORKS LTD COMMON M51474100 96,413,125 811,900 X 811,900
ORBOTECH LTD COMMON M75253100 243,477,875 3,141,650 X 3,141,650
1,934,633 24,963 X 24,963
ORCKIT COMMUNICATIONS LTD COMMON M7531S107 6,862,500 200,000 X 200,000
TECNOMATIX TECHNOLOGIES LTD COMMON M8743P105 43,685,625 1,519,500 X 1,519,500
ROYAL CARIBBEAN CRUISES LTD COMMON V7780T103 9,739,219 197,500 X 197,500
202,921 4,115 X 4,115
CREATIVE TECHNOLOGY LTD COMMON Y1775U107 188,642,113 10,857,100 X 10,857,100
Total 1,093,491,728
Grand Total 28,084,126,927
Total Number of Securities 642
</TABLE>
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