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Previous: BANCTEC INC, 8-K, 2000-07-20 |
Next: TECO ENERGY INC, 8-K, 2000-07-20 |
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F
FORM 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: June 30, 2000
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 July 20, 2000
Report Type (Check only one.):
[X] 13F HOLDINGS REPORT.
[ ] 13F NOTICE.
[ ] 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: 0
Form 13F Information Table Entry Total: 703
Form 13F Information Table Value Total: $29,649,657,581
List of Other Included Managers:
<PAGE>
<TABLE>
<CAPTION>
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C>
6/30/2000 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 5,085,560 635,695 X 635,695
323,840 40,480 X 40,480
ACT MFG INC COMMON 000973107 85,245,783 1,835,710 X 1,835,710
AFLAC INC COMMON 001055102 13,955,813 303,800 X 303,800
17,456 380 X 380
AES CORP COMMON 00130H105 79,935,000 1,752,000 X 1,752,000
2,356,303 51,645 X 51,645
3,864,438 84,700 X 84,700
AMFM INC COMMON 001693100 499,094,043 7,233,247 X 7,233,247
198,375 2,875 X 2,875
AT&T CORP COMMON 001957109 71,787,169 2,269,950 X 2,269,950
ATMI INC COMMON 00207R101 46,681,350 1,003,900 X 1,003,900
AXA FINANCIAL INC COMMON 002451102 99,623,468 2,930,102 X 2,930,102
30,024,040 883,060 X 883,060
ABBOTT LABS COMMON 002824100 59,592,317 1,337,275 X 1,337,275
ABERCROMBIE & FITCH CO COMMON 002896207 6,526,894 535,540 X 535,540
322,786 26,485 X 26,485
ABGENIX INC COMMON 00339B107 251,705 2,100 X 2,100
753,915 6,290 X 6,290
2,367,822 19,755 X 19,755
ABOUT.COM INC COMMON 003736105 8,716,050 276,700 X 276,700
1,824,386 57,917 X 57,917
ABRAXAS PETROLEUM CORP COMMON 003830106 1,433,073 955,382 X 955,382
7,601 5,068 X 5,068
ABRAXAS PETROLEUM CONTINGENT RIGHCOMMON 003831112 1 X 1
1 X 1
ACCELERATED NETWORKS INC COMMON 00429P107 1,400,625 33,200 X 33,200
33,750 800 X 800
ACCRUE SOFTWARE INC COMMON 00437W102 20,135,600 567,200 X 567,200
6,320,243 178,035 X 178,035
ACKERLEY GROUP INC COMMON 004527107 12,214,125 1,039,500 X 1,039,500
ACTIVISION INC. CONVERT 004930AA1 6,743,750 10,375,000 X 10,375,000
Total 1,066,837,279
6/30/2000 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
ACTUATE SOFTWARE CORP COMMON 00508B102 30,946,825 579,800 X 579,800
8,813,867 165,131 X 165,131
ACXIOM CORP COMMON 005125109 6,905,150 253,400 X 253,400
ADAPTEC INC COMMON 00651F108 204,638,070 8,995,080 X 8,995,080
ADELPHIA COMMUNICATIONS CORP COMMON 006848105 243,750 5,200 X 5,200
117,338,906 2,503,230 X 2,503,230
2,295,469 48,970 X 48,970
ADVANCED FIBRE COMMUNICATIONS COMMON 00754A105 774,844 17,100 X 17,100
2,179,305 48,095 X 48,095
7,230,516 159,570 X 159,570
ADVANCED MICRO DEVICES INC COMMON 007903107 201,035,014 2,602,395 X 2,602,395
ADVANCED ENERGY INDS COMMON 007973100 11,186,338 189,800 X 189,800
3,112,254 52,806 X 52,806
ADVENT SOFTWARE INC COMMON 007974108 67,059,360 1,039,680 X 1,039,680
20,274,672 314,336 X 314,336
AETHER SYSTEMS INC. COMMON 00808V105 22,099,000 107,800 X 107,800
127,100 620 X 620
AFFILIATED MANAGERS GROUP COMMON 008252108 35,012,250 769,500 X 769,500
10,466,183 230,026 X 230,026
AGILENT TECHNOLOGIES INC COMMON 00846U101 64,593,710 875,847 X 875,847
AIRGATE PCS INC COMMON 009367103 24,325,925 462,800 X 462,800
6,742,139 128,269 X 128,269
ELECTROLUX AB COMMON 010198208 80,010 2,540 X 2,540
397,751 12,627 X 12,627
ALAMOSA PCS HOLDINGS INC COMMON 011593100 17,985,900 861,600 X 861,600
5,187,333 248,495 X 248,495
ALCATEL SA COMMON 013904305 14,571,813 219,125 X 219,125
520,363 7,825 X 7,825
ALKERMES INC COMMON 01642T108 494,813 10,500 X 10,500
1,446,502 30,695 X 30,695
4,614,716 97,925 X 97,925
ALLIED CAPITAL CORP COMMON 01903Q108 10,568,900 621,700 X 621,700
Total 903,268,744
6/30/2000 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
10,115 595 X 595
ALLIED ZURICH PLC COMMON 01959Q101 106,703 4,521 X 4,521
525,701 22,274 X 22,274
ALLSTATE CORP COMMON 020002101 71,585,593 3,217,330 X 3,217,330
20,803,661 934,996 X 934,996
ALLTEL CORP COMMON 020039103 91,275,436 1,473,670 X 1,473,670
ALPHA INDUSTRIES INC COMMON 020753109 28,495,219 646,700 X 646,700
8,416,378 191,010 X 191,010
ALPHARMA INC COMMON 020813101 37,250,400 598,400 X 598,400
10,834,550 174,049 X 174,049
ALTEON WEBSYSTEMS INC COMMON 02145A109 56,732,436 566,970 X 566,970
ALZA CORP DEL COMMON 022615108 473,000 8,000 X 8,000
83,403,499 1,410,630 X 1,410,630
6,640,151 112,307 X 112,307
3,240,050 54,800 X 54,800
AMERICA ONLINE INC DEL COMMON 02364J104 55,030,777 1,044,475 X 1,044,475
UNITED CUSTOMER MNGNT SOLUTIONS COMMON 0246718 586,000 5,860 X 5,860
AMERICAN CAPITAL STRATEGIES COMMON 024937104 19,322,038 809,300 X 809,300
4,949,288 207,300 X 207,300
AMERICAN GENERAL CORP COMMON 026351106 75,126,075 1,231,575 X 1,231,575
AMERICAN HOME PRODS CORP COMMON 026609107 177,967,321 3,029,231 X 3,029,231
18,698,069 318,265 X 318,265
AMERICAN INTL GROUP INC COMMON 026874107 134,515,469 1,144,813 X 1,144,813
1,109,582 9,443 X 9,443
1,095,688 9,325 X 9,325
AMERICAN NATIONAL CAN GROUP COMMON 027714104 6,555,431 388,470 X 388,470
511,144 30,290 X 30,290
AMERICAN PWR CONVERSION CORP COMMON 029066107 428,306,781 10,494,500 X 10,494,500
AMERICAN TOWER CORP -CL A COMMON 029912201 687,844 16,500 X 16,500
1,791,937 42,985 X 42,985
6,473,443 155,285 X 155,285
AMERISOURCE HEALTH CORP COMMON 03071P102 12,322,500 397,500 X 397,500
Total 1,364,842,276
6/30/2000 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
3,070,860 99,060 X 99,060
AMKOR TECHNOLOGIES INC COMMON 031652100 416,748,591 11,801,730 X 11,801,730
AMKOR TECH IND CONVERT 031652AF7 10,612,219 11,775,000 X 11,775,000
90,125 100,000 X 100,000
AMPHENOL CORP NEW COMMON 032095101 83,282,738 1,258,285 X 1,258,285
ANADARKO PETE CORP COMMON 032511107 14,794 300 X 300
ANADIGICS INC COMMON 032515108 258,875 7,600 X 7,600
641,738 18,840 X 18,840
2,423,240 71,141 X 71,141
ANDREW CORP COMMON 034425108 13,673,363 407,400 X 407,400
4,006,221 119,366 X 119,366
ANDRX CORP COMMON 034551101 14,497,481 226,800 X 226,800
19,177 300 X 300
ANHEUSER BUSCH COS INC COMMON 035229103 55,216,469 739,300 X 739,300
ANTEC CORP COMMON 03664P105 38,042,156 915,300 X 915,300
10,433,060 251,021 X 251,021
APEX INC COMMON 037548104 146,363,875 3,345,460 X 3,345,460
APOLLO GROUP INC COMMON 037604105 322,000 11,500 X 11,500
943,880 33,710 X 33,710
3,017,420 107,765 X 107,765
APRIA HEALTHCARE GROUP INC COMMON 037933108 6,856,938 559,750 X 559,750
581,936 47,505 X 47,505
APPLICA INC COMMON 03815A106 5,861,934 518,182 X 518,182
367,883 32,520 X 32,520
APPLIED EXTRUSION TECHNOLOGIES COMMON 038196101 3,703,298 705,390 X 705,390
108,124 20,595 X 20,595
APPLIED MATLS INC COMMON 038222105 268,191,094 2,959,350 X 2,959,350
ARMSTRONG HOLDINGS INC COMMON 042384107 25,908,903 1,692,010 X 1,692,010
7,516,033 490,843 X 490,843
ARROW ELECTRS INC COMMON 042735100 93,904,580 3,029,180 X 3,029,180
ART TECHNOLOGY GROUP INC COMMON 04289L107 16,281,219 161,300 X 161,300
Total 1,232,960,222
6/30/2000 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
15,645 155 X 155
ARTESYN TECHNOLOGIES INC COMMON 043127109 22,478,063 808,200 X 808,200
ASAHI CHEM INDUS - UNSPON ADR COMMON 043389204 147,090 2,075 X 2,075
703,551 9,925 X 9,925
ASPECT COMMUNICATIONS CORP. COMMON 04523Q102 581,825 14,800 X 14,800
45,686,432 1,162,135 X 1,162,135
5,453,233 138,715 X 138,715
ASPEN TECHNOLOGY INC COMMON 045327103 23,096,150 599,900 X 599,900
6,100,133 158,445 X 158,445
ATMEL CORP COMMON 049513104 69,070,009 1,873,085 X 1,873,085
AUTOBYTEL.COM INC COMMON 05275N106 4,089,597 664,300 X 664,300
AUTODESK INC COMMON 052769106 346,875 10,000 X 10,000
220,747,261 6,363,885 X 6,363,885
3,270,684 94,290 X 94,290
AUTONOMY CORPORATION PLC COMMON 05329Q105 26,789,400 217,800 X 217,800
AVANT CORP COMMON 053487104 357,827 19,100 X 19,100
1,021,960 54,550 X 54,550
3,359,916 179,345 X 179,345
AVIS RENT A CAR INC COMMON 053790101 7,798,781 415,935 X 415,935
555,375 29,620 X 29,620
AVNET INC COMMON 053807103 74,022,210 1,249,320 X 1,249,320
AXA-UAP COMMON 054536107 154,351 1,940 X 1,940
815,675 10,252 X 10,252
BJS WHOLESALE CLUB INC COMMON 05548J106 250,800 7,600 X 7,600
728,145 22,065 X 22,065
2,344,320 71,040 X 71,040
BP AMOCO PLC - SPONS ADR COMMON 055622104 74,480,991 1,316,791 X 1,316,791
438,642 7,755 X 7,755
BMC SOFTWARE INC COMMON 055921100 152,962,931 4,192,560 X 4,192,560
442,738 12,135 X 12,135
970,484 26,600 X 26,600
BWAY CORP COMMON 056039100 5,493,344 829,184 X 829,184
246,152 37,155 X 37,155
Total 755,020,591
6/30/2000 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
BANCO BILBAO VIZCAYA - SPON ADR COMMON 05946K101 127,248 8,627 X 8,627
643,557 43,631 X 43,631
BANK OF AMERICA CORP COMMON 060505104 87,715,313 2,039,891 X 2,039,891
138,331 3,217 X 3,217
BANK OF NEW YORK CO INC. COMMON 064057102 246,229,823 5,295,265 X 5,295,265
35,997,975 774,150 X 774,150
BANK TOKYO-MITSUBISHI LTD COMMON 065379109 88,573 7,305 X 7,305
448,661 37,003 X 37,003
BANK UTD CORP COMMON 065412108 8,779,985 249,520 X 249,520
507,052 14,410 X 14,410
BARCLAYS PLC -SPONS ADR COMMON 06738E204 101,500 1,015 X 1,015
519,500 5,195 X 5,195
BARR LABS INC COMMON 068306109 40,506,019 903,900 X 903,900
12,787,426 285,354 X 285,354
BARRETT RES CORP COMMON 068480201 273,938 9,000 X 9,000
818,160 26,880 X 26,880
2,590,079 85,095 X 85,095
BAXTER INTL INC COMMON 071813109 157,165,805 2,235,247 X 2,235,247
31,098,867 442,295 X 442,295
BAY VIEW CAP CORP DEL COMMON 07262L101 4,783,741 487,515 X 487,515
259,933 26,490 X 26,490
BAYER A G COMMON 072730302 65,313 1,670 X 1,670
357,303 9,136 X 9,136
BAYERISCHE HYPO-UND VER-ADR COMMON 072735103 85,845 1,315 X 1,315
455,337 6,975 X 6,975
BE FREE INC COMMON 073308108 2,782,800 309,200 X 309,200
457,200 50,800 X 50,800
BERKLEY W R CORP COMMON 084423102 4,728,019 252,161 X 252,161
262,688 14,010 X 14,010
BESTFOODS COMMON 08658U101 41,550 600 X 600
BINDLEY WESTN INDS INC COMMON 090324104 16,639,763 629,400 X 629,400
4,597,878 173,915 X 173,915
BINDVIEW DEVELOPMENT CORP COMMON 090327107 262,800 21,900 X 21,900
Total 662,317,980
6/30/2000 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
11,463,180 955,265 X 955,265
2,447,340 203,945 X 203,945
BIOMET INC COMMON 090613100 399,750 10,400 X 10,400
1,160,620 30,195 X 30,195
3,719,405 96,765 X 96,765
BOEING CO COMMON 097023105 12,544 300 X 300
BRINKER INTL INC COMMON 109641100 19,784,700 676,400 X 676,400
5,702,726 194,965 X 194,965
BRISTOL MYERS SQUIBB CO COMMON 110122108 47,763,544 819,975 X 819,975
121,451 2,085 X 2,085
BRITISH AWYS PLC COMMON 110419306 5,750 100 X 100
BRITISH AMERICAN TOBACCO COMMON 110448107 X
BROADBASE SOFTWARE, INC. COMMON 11130R100 7,120,313 232,500 X 232,500
1,913,450 62,480 X 62,480
BROADCOM CORP-CL A COMMON 111320107 24,378,691 111,350 X 111,350
876,845 4,005 X 4,005
1,444,988 6,600 X 6,600
BROCADE COMMUNICATIONS SYS COMMON 111621108 25,706,161 140,100 X 140,100
25,688 140 X 140
BROKEN HILL PROPRIETARY COMPANY LCOMMON 112169602 113,406 4,775 X 4,775
599,331 25,235 X 25,235
BROTHERS GOURMET COFFEES INC COMMON 114822109 4 1,086 X 1,086
BURR BROWN CORP COMMON 122574106 14,221,865 164,059 X 164,059
4,668,209 53,851 X 53,851
C COR ELECTRS INC COMMON 125010108 24,580,800 910,400 X 910,400
6,968,430 258,090 X 258,090
C-CUBE MICROSYSTEMS INC-NEW COMMON 12501N108 57,444,338 2,927,100 X 2,927,100
CSG SYS INTL INC COMMON 126349109 515,775 9,200 X 9,200
248,269,137 4,428,435 X 4,428,435
13,079,942 233,310 X 233,310
CTS CORP COMMON 126501105 157,500 3,500 X 3,500
102,764,700 2,283,660 X 2,283,660
1,467,225 32,605 X 32,605
Total 628,897,806
6/30/2000 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
CVS CORP COMMON 126650100 74,290,000 1,857,250 X 1,857,250
CABLE & WIRELESS PLC-SP ADR COMMON 126830207 271,839 5,430 X 5,430
CABLEVISION SYS CORP COMMON 12686C109 123,136,110 1,814,160 X 1,814,160
CADBURY SCHWEPPES PLC - SP ADR COMMON 127209302 105,131 4,005 X 4,005
541,931 20,645 X 20,645
CADMUS COMMUNICATIONS CORP COMMON 127587103 6,773,325 694,700 X 694,700
348,075 35,700 X 35,700
CALIPER TECHNOLOGIES CORP COMMON 130876105 3,077,400 66,900 X 66,900
1,244,208 27,048 X 27,048
CALPINE CORP COMMON 131347106 5,759,700 87,600 X 87,600
5,918 90 X 90
CANAL PLUS - SPONSORED ADR COMMON 137041208 3,712 110 X 110
149,140 4,420 X 4,420
CANDESCENT TECHNOLOGY CORP CONVERT 137392AA4 2,340,000 3,000,000 X 3,000,000
CANON INC COMMON 138006309 208,553 4,140 X 4,140
1,073,088 21,302 X 21,302
CAPITAL ONE FINL CORP COMMON 14040H105 263,288 5,900 X 5,900
773,798 17,340 X 17,340
2,471,779 55,390 X 55,390
CAPSTONE TURBINE CORP COMMON 14067D102 7,210,000 160,000 X 160,000
CAREER EDUCATION CORP COMMON 141665109 7,648,450 157,700 X 157,700
CAREMARK RX INC COMMON 141705103 313,375 46,000 X 46,000
842,877 123,725 X 123,725
2,936,630 431,065 X 431,065
CAREY INTERNATIONAL INC COMMON 141750109 9,204,675 663,400 X 663,400
2,745,571 197,879 X 197,879
CASELLA WASTE SYS INC COMMON 147448104 8,644,075 804,100 X 804,100
2,135,111 198,615 X 198,615
CENDANT CORP COMMON 151313103 12,614 901 X 901
CENTURYTEL INC COMMON 156700106 1,782,500 62,000 X 62,000
29 1 X 1
Total 266,312,901
6/30/2000 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
CERIDIAN CORP COMMON 15677T106 435,531 18,100 X 18,100
1,170,641 48,650 X 48,650
4,073,300 169,280 X 169,280
CHARLES RIVER LABORATORIES COMMON 159864107 6,660,688 300,200 X 300,200
1,073,875 48,400 X 48,400
CHARTER COMMUNICATIONS INC-A COMMON 16117M107 192,319 11,700 X 11,700
97,549,494 5,934,570 X 5,934,570
5,988,428 364,315 X 364,315
CHINA TELECOM COMMON 169428109 19,488,250 109,600 X 109,600
679,244 3,820 X 3,820
CHOICEPOINT INC COMMON 170388102 440,550 9,900 X 9,900
1,182,365 26,570 X 26,570
3,748,458 84,235 X 84,235
CHOICE ONE COMMUNCATIONS IN COMMON 17038P104 22,524,419 551,900 X 551,900
5,815,169 142,485 X 142,485
CHUBB CORP COMMON 171232101 115,795,275 1,882,850 X 1,882,850
CIENA CORP COMMON 171779101 94,198,440 565,120 X 565,120
895,945 5,375 X 5,375
1,433,513 8,600 X 8,600
CIRCUIT CITY STORE INC COMMON 172737108 10,684,716 321,950 X 321,950
10,122 305 X 305
CISCO SYS INC COMMON 17275R102 320,782,140 5,046,720 X 5,046,720
3,799,639 59,778 X 59,778
6,260,906 98,500 X 98,500
CITIGROUP INC COMMON 172967101 244,664,164 4,060,816 X 4,060,816
35,253,179 585,115 X 585,115
1,057,388 17,550 X 17,550
CLOROX CO DEL COMMON 189054109 4,392 98 X 98
COASTAL CORP COMMON 190441105 77,670,413 1,275,900 X 1,275,900
COCA COLA CO COMMON 191216100 110,829,964 1,929,575 X 1,929,575
2,460,910 42,845 X 42,845
4,221,656 73,500 X 73,500
COGNEX CORP COMMON 192422103 154,197,923 2,979,670 X 2,979,670
1,724,983 33,333 X 33,333
Total 1,356,968,395
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 10
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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
COLGATE PALMOLIVE CO COMMON 194162103 1,963,900 32,800 X 32,800
COMCAST CORP -CL A COMMON 200300101 3,273,275 84,200 X 84,200
250,355 6,440 X 6,440
583,125 15,000 X 15,000
COMCAST CORP COMMON 200300200 42,168,600 1,041,200 X 1,041,200
COMDISCO INC COMMON 200336105 58,104,428 2,604,120 X 2,604,120
COMMERCE BANCORP INC NJ COMMON 200519106 46 1 X 1
7 X
COMMERCIAL FEDERAL CORPORATION COMMON 201647104 5,913,439 379,980 X 379,980
385,561 24,775 X 24,775
COMMUNITY HEALTH SYSTEMS COMMON 203668108 278,425 17,200 X 17,200
11,849,250 732,000 X 732,000
6,246,352 385,875 X 385,875
BRASIL DISTR PAO ACU COMMON 20440T201 719,600 22,400 X 22,400
COMPLETE BUSINESS SOLUTIONS COMMON 20452F107 5,375,881 306,100 X 306,100
250,090 14,240 X 14,240
COMPUTER ASSOC INTL INC COMMON 204912109 193,156,031 3,773,500 X 3,773,500
COMPUTER SCIENCES CORP COMMON 205363104 16,491,000 220,800 X 220,800
10,456 140 X 140
COMPUWARE CORP COMMON 205638109 15,674,550 1,510,800 X 1,510,800
COMVERSE TECHNOLOGY INC COMMON 205862402 25,305,300 272,100 X 272,100
CONAGRA INC COMMON 205887102 67,060,083 3,517,906 X 3,517,906
22,417,977 1,176,025 X 1,176,025
COM21 INC COMMON 205937105 8,030,000 321,200 X 321,200
2,726,250 109,050 X 109,050
CONCORD EFS INC COMMON 206197105 30,100,200 1,157,700 X 1,157,700
CONEXANT SYSTEMS INC COMMON 207142100 58,063,113 1,194,100 X 1,194,100
COPART INC COMMON 217204106 4,968,000 310,500 X 310,500
COPPER MOUNTAIN NETWORKS INC COMMON 217510106 3,392,813 38,500 X 38,500
CORN PRODS INTL INC COMMON 219023108 2,650 100 X 100
Total 584,760,755
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 11
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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 151,094,916 559,870 X 559,870
3,837,623 14,220 X 14,220
6,288,088 23,300 X 23,300
CORPORATE EXECUTIVE BOARD CO COMMON 21988R102 19,058,213 318,300 X 318,300
5,248,583 87,659 X 87,659
CORRECTIONAL PROPERTIES TRST COMMON 22025E104 5,217,450 496,900 X 496,900
2,353,502 224,143 X 224,143
COSTCO WHOLESALE CORPORATION COMMON 22160K105 19,438,650 589,050 X 589,050
COSTAR GROUP INC COMMON 22160N109 14,294,146 570,340 X 570,340
4,507,892 179,866 X 179,866
COX RADIO INC COMMON 224051102 422,800 15,100 X 15,100
21,630,980 772,535 X 772,535
9,743,328 347,976 X 347,976
CREDENCE SYS CORP COMMON 225302108 246,779,184 4,471,650 X 4,471,650
2,226,264 40,340 X 40,340
CROMPTON CORPORATION COMMON 227116100 9,547,993 779,428 X 779,428
605,579 49,435 X 49,435
CROSS TIMBERS OIL CO COMMON 227573102 26,017,319 1,175,924 X 1,175,924
10,802,841 488,264 X 488,264
CROWN CASTLE INTL CORP COMMON 228227104 10,329,500 283,000 X 283,000
CROWN CORK & SEAL INC COMMON 228255105 44,505,825 2,967,055 X 2,967,055
13,150,500 876,700 X 876,700
CUBIC CORP COMMON 229669106 4,748,906 253,275 X 253,275
248,531 13,255 X 13,255
CUTTER & BUCK INC COMMON 232217109 4,144,470 522,138 X 522,138
249,269 31,404 X 31,404
CYLINK CORP COMMON 232565101 201,000 12,000 X 12,000
563,721 33,655 X 33,655
1,876,335 112,020 X 112,020
CYPRESS SEMICONDUCTOR CORP COMMON 232806109 96,821,790 2,291,640 X 2,291,640
CYTYC CORP COMMON 232946103 20,213,113 378,700 X 378,700
6,385,785 119,640 X 119,640
DQE INC COMMON 23329J104 110,008 2,785 X 2,785
Total 762,664,102
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 12
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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
DAIWA SECURITIES-UNSPONS ADR COMMON 234064202 162,759 1,230 X 1,230
780,713 5,900 X 5,900
DAL-TILE INTL INC COMMON 23426R108 6,295,740 763,120 X 763,120
361,391 43,805 X 43,805
DALLAS SEMICONDUCTOR CORP COMMON 235204104 146,443,275 3,593,700 X 3,593,700
DANA CORP COMMON 235811106 21 1 X 1
DELL COMPUTER CORP COMMON 247025109 117,001,303 2,372,650 X 2,372,650
1,019,536 20,675 X 20,675
1,671,694 33,900 X 33,900
DELPHI AUTOMOTIVE SYSTEMS COMMON 247126105 X
DEVRY INC DEL COMMON 251893103 10,725,694 405,700 X 405,700
3,218,660 121,746 X 121,746
DIAL CORP NEW COMMON 25247D101 40,519,148 3,905,460 X 3,905,460
11,865,545 1,143,667 X 1,143,667
DIALOG SEMICONDUCTOR PLC - ADR COMMON 25250P108 19,165,350 381,400 X 381,400
DIGITAL ISLAND INC COMMON 25385N101 622,400 12,800 X 12,800
1,811,768 37,260 X 37,260
5,815,307 119,595 X 119,595
DISNEY WALT CO COMMON 254687106 26,578,800 684,800 X 684,800
1,074,563 27,686 X 27,686
1,230,356 31,700 X 31,700
DOBSON COMMUNICATIONS CORPORATIONCOMMON 256069105 413,875 21,500 X 21,500
27,265,700 1,416,400 X 1,416,400
10,934,000 568,000 X 568,000
DOBSON COMMUNICATIONS CONVERT 256072505 X
DOCUMENTUM INC COMMON 256159104 187,688 2,100 X 2,100
38,954,988 435,860 X 435,860
12,051,951 134,847 X 134,847
DOLE FOOD INC COMMON 256605106 45,391,290 3,242,235 X 3,242,235
12,219,270 872,805 X 872,805
DOW CHEM CO COMMON 260543103 56,720,803 1,878,950 X 1,878,950
18,640,781 617,500 X 617,500
DU PONT E I DE NEMOURS & CO COMMON 263534109 34,762,656 794,575 X 794,575
Total 653,907,023
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 13
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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
84,438 1,930 X 1,930
DURA PHARMACEUTICALS INC COMMON 26632S109 14,307,438 995,300 X 995,300
3,986,331 277,310 X 277,310
DYCOM INDS INC COMMON 267475101 13,294,000 289,000 X 289,000
3,563,160 77,460 X 77,460
DYNEGY INC COMMON 26816Q101 7,353,841 107,650 X 107,650
7,856 115 X 115
ECI TELECOM LTD COMMON 268258100 357,500 10,000 X 10,000
E M C CORP MASS COMMON 268648102 22,534,994 292,900 X 292,900
572,030 7,435 X 7,435
1,384,875 18,000 X 18,000
ENSCO INTL INC COMMON 26874Q100 526,444 14,700 X 14,700
1,591,508 44,440 X 44,440
4,914,908 137,240 X 137,240
EOG RESOURCES INC COMMON 26875P101 338,350 10,100 X 10,100
894,450 26,700 X 26,700
3,195,733 95,395 X 95,395
EARTHGRAINS CO COMMON 270319106 1,944 100 X 100
ECHOSTAR COMMUNICATIONS NEW COMMON 278762109 59,092,950 1,784,780 X 1,784,780
EDWARDS LIFESCIENCES CORP COMMON 28176E108 222 12 X 12
EFFICIENT NETWORKS INC COMMON 282056100 12,064,250 164,000 X 164,000
7,724 105 X 105
EL PASO NAT GAS CO COMMON 283905107 109,971,770 2,158,955 X 2,158,955
29,161,719 572,500 X 572,500
ELAN PLC COMMON 284131208 63,437,625 1,309,680 X 1,309,680
1,844,016 38,070 X 38,070
2,087,656 43,100 X 43,100
ELECTRO SCIENTIFIC INDS COMMON 285229100 134,074,055 3,044,975 X 3,044,975
ELECTRONIC DATA SYS NEW COMMON 285661104 108,125,531 2,621,225 X 2,621,225
ELECTRONICS FOR IMAGING INC COMMON 286082102 207,046,125 8,179,600 X 8,179,600
EMBRATEL PARTICIPACOES COMMON 29081N100 999,338 42,300 X 42,300
EMMIS BROADCASTING CORP COMMON 291525103 9,942,413 240,300 X 240,300
Total 816,765,191
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 14
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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
2,646,966 63,975 X 63,975
ENDOCARE INC COMMON 29264P104 10,789,200 532,800 X 532,800
2,566,890 126,760 X 126,760
ENRON CORP COMMON 293561106 37,042,350 574,300 X 574,300
1,728,923 26,805 X 26,805
2,663,850 41,300 X 41,300
ENTERCOM COMMUNICATIONS CORP COMMON 293639100 18,666,375 382,900 X 382,900
17,794 365 X 365
ENTRUST TECHNOLOGIES INC COMMON 293848107 6,140,050 74,200 X 74,200
EQUITABLE RES INC COMMON 294549100 8,407,080 174,240 X 174,240
615,188 12,750 X 12,750
ERICSSON L M TEL CO COMMON 294821400 17,623,500 881,175 X 881,175
1,067,280 53,364 X 53,364
E-STAMP RESTRICTED COMMON 297999997 243,469 152,765 X 152,765
EUROPEJSKI FUNDUSZ LEASINGOWY COMMON 298793100 484,500 30,000 X 30,000
EXAR CORP COMMON 300645108 22,420,266 257,150 X 257,150
7,435,350 85,280 X 85,280
EXFO ELECTRONICS -OPTICAL ENG INCCOMMON 302043104 52,650 1,200 X 1,200
4,501,575 102,600 X 102,600
587,925 13,400 X 13,400
EXODUS COMMUNICATIONS INC COMMON 302088109 20,364,231 442,100 X 442,100
367,118 7,970 X 7,970
967,313 21,000 X 21,000
EXODUS COMMUNICATIONS CONVERT 302088AJ8 2,838,550 1,985,000 X 1,985,000
21,450 15,000 X 15,000
EXPEDITORS INTL WASH INC COMMON 302130109 14,069,500 296,200 X 296,200
4,469,655 94,098 X 94,098
EXXON MOBIL CORP COMMON 30231G102 107,226,997 1,365,949 X 1,365,949
140,986 1,796 X 1,796
FAIRCHILD SEMICON INTL - CL A COMMON 303726103 162,196,223 4,004,845 X 4,004,845
FAMILY DLR STORES INC COMMON 307000109 338,431 17,300 X 17,300
833,363 42,600 X 42,600
3,147,998 160,920 X 160,920
Total 462,682,992
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 15
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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
FEDERAL NATL MTG ASSN COMMON 313586109 125,373,319 2,402,363 X 2,402,363
20,757,422 397,747 X 397,747
FINISAR CORPORATION COMMON 31787A101 17,980,338 686,600 X 686,600
18,855 720 X 720
FIRST DATA CORP COMMON 319963104 108,476,776 2,185,930 X 2,185,930
FIRSTSERVICE CORP COMMON 33761N109 2,234,400 186,200 X 186,200
FISERV INC COMMON 337738108 382,763 8,850 X 8,850
1,105,600 25,563 X 25,563
3,560,556 82,325 X 82,325
FORD MTR CO DEL COMMON 345370100 118,847,270 2,763,890 X 2,763,890
21,984,051 511,257 X 511,257
FOREST LABS INC COMMON 345838106 555,500 5,500 X 5,500
10,607,525 105,025 X 105,025
5,188,875 51,375 X 51,375
FORRESTER RESH INC COMMON 346563109 29,022,334 398,590 X 398,590
9,476,547 130,150 X 130,150
FORT JAMES CORP COMMON 347471104 40,297,371 1,742,589 X 1,742,589
15,608,219 674,950 X 674,950
FORTIS (NL) - SPONS ADR COMMON 34956J101 111,061 3,800 X 3,800
575,003 19,674 X 19,674
FORWARD AIR CORPORATION COMMON 349853101 2,382,000 59,550 X 59,550
FREDS INC COMMON 356108100 8,854,974 491,943 X 491,943
621,720 34,540 X 34,540
FUJITSU LTD - UNSPON ADR COMMON 359590304 99,727 575 X 575
527,250 3,040 X 3,040
FURNITURE BRANDS INTL INC COMMON 360921100 5,935,126 392,405 X 392,405
342,808 22,665 X 22,665
GKN PUB LTD COMMON 361755200 85,474 6,710 X 6,710
447,177 35,105 X 35,105
GTE CORP COMMON 362320103 74,026,144 1,189,175 X 1,189,175
144,420 2,320 X 2,320
GALILEO INTERNATIONAL INC COMMON 363547100 65,157,138 3,121,300 X 3,121,300
Total 690,787,741
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 16
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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
GARTNER GROUP INC COMMON 366651107 232,800 19,400 X 19,400
44,083,680 3,673,640 X 3,673,640
2,172,960 181,080 X 181,080
GARTNER GROUP INC - CL B COMMON 366651206 172,813 17,500 X 17,500
480,962 48,705 X 48,705
1,609,181 162,955 X 162,955
GENETECH INC COMMON 368710406 16,047,600 93,300 X 93,300
565,192 3,286 X 3,286
1,169,600 6,800 X 6,800
GENERAL DYNAMICS CORP COMMON 369550108 17,341,775 331,900 X 331,900
764,156 14,625 X 14,625
1,259,225 24,100 X 24,100
GENERAL ELEC CO COMMON 369604103 245,083,925 4,624,225 X 4,624,225
1,420,506 26,802 X 26,802
2,361,150 44,550 X 44,550
GENERAL MTRS CORP COMMON 370442105 69,103,665 1,190,160 X 1,190,160
20,695,391 356,433 X 356,433
GENERAL MOTORS CORP COMMON 370442832 26,325 300 X 300
GENERAL SEMICONDUCTOR INC COMMON 370787103 8,167,075 553,700 X 553,700
3,182,062 215,733 X 215,733
GENOMIC SOLUTIONS COMMON 37243R109 16,754,400 1,145,600 X 1,145,600
4,953,590 338,707 X 338,707
GENUINE PARTS CO COMMON 372460105 14,000 700 X 700
GEORGIA PAC CORP COMMON 373298108 69,000,094 2,628,575 X 2,628,575
23,442,615 893,052 X 893,052
GEOGRAPHIC NETWORKS AFFILIATES INCOMMON 373999994 1,000,000 10,000 X 10,000
GILEAD SCIENCES INC COMMON 375558103 4,822,275 67,800 X 67,800
4,979 70 X 70
GILLETTE CO COMMON 375766102 27,616,347 790,450 X 790,450
GLOBAL CROSSING CP 144A CONVERT 37932J301 13,367,188 73,750 X 73,750
GLOBAL TELESYSTEMS , INC. COMMON 37936U104 19,151,631 1,587,700 X 1,587,700
5,392,963 447,085 X 447,085
GLOBESPAN INC COMMON 379571102 24,220,300 198,400 X 198,400
Total 645,680,423
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 17
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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
20,143 165 X 165
GOODRICH B F CO COMMON 382388106 89,072,586 2,614,975 X 2,614,975
24,415,557 716,787 X 716,787
GOTO.COM INC COMMON 38348T107 5,673,588 370,520 X 370,520
1,665,005 108,735 X 108,735
GROUPE DANONE - SPONS ADR COMMON 399449107 142,769 5,300 X 5,300
GRUPO CARSO - SPONSORED ADR COMMON 400485207 1,199,004 171,000 X 171,000
GUIDANT CORP COMMON 401698105 67,918,950 1,372,100 X 1,372,100
387,833 7,835 X 7,835
648,450 13,100 X 13,100
HNC SOFTWARE INC COMMON 40425P107 58,934,200 954,400 X 954,400
HACI OMER SABANCI HLDG ADR COMMON 40450N209 490,044 166,381 X 166,381
HALLIBURTON CO COMMON 406216101 6,719,500 142,400 X 142,400
HANOVER COMPRESSOR CO COMMON 410768105 456,000 12,000 X 12,000
1,372,560 36,120 X 36,120
4,332,760 114,020 X 114,020
HARLEY DAVIDSON INC COMMON 412822108 23,947,000 622,000 X 622,000
724,840 18,827 X 18,827
1,139,600 29,600 X 29,600
HARMAN INTL INDS INC COMMON 413086109 8,095,615 132,715 X 132,715
464,210 7,610 X 7,610
HARRAHS ENTMT INC COMMON 413619107 263,813 12,600 X 12,600
604,256 28,860 X 28,860
2,463,611 117,665 X 117,665
HARRIS CORP DEL COMMON 413875105 222,700 6,800 X 6,800
627,326 19,155 X 19,155
1,993,656 60,875 X 60,875
HARRIS INTERACTIVE INC COMMON 414549105 2,722,672 562,100 X 562,100
963,732 198,964 X 198,964
HARTFORD FINL SVCS GROUP INC COMMON 416515104 12,848,844 229,700 X 229,700
HASBRO INC COMMON 418056107 9,038 600 X 600
HEALTH MGMT ASSOC INC NEW COMMON 421933102 455,881 34,900 X 34,900
Total 320,995,741
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 18
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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
1,245,967 95,385 X 95,385
4,240,871 324,660 X 324,660
HEWLETT PACKARD CO COMMON 428236103 45,304,650 362,800 X 362,800
HISPANIC BROADCASTING CORP CL A COMMON 43357B104 159,000 4,800 X 4,800
453,150 13,680 X 13,680
1,462,469 44,150 X 44,150
HOME DEPOT INC COMMON 437076102 32,714,056 655,100 X 655,100
HONEYWELL INTL COMMON 438516106 61,602,478 1,828,645 X 1,828,645
20,099,478 596,645 X 596,645
HOUSEHOLD INTL INC COMMON 441815107 3,699,063 89,000 X 89,000
HUMANA INC COMMON 444859102 40,280,492 8,262,665 X 8,262,665
11,653,200 2,390,400 X 2,390,400
HYPERION SOLUTIONS CORP COMMON 44914M104 17,516,250 540,000 X 540,000
I-CABLE COMMUNICATIONS-ADR COMMON 44934B104 606,825 78,300 X 78,300
IDEC PHARMACEUTICALS CORP COMMON 449370105 469,250 4,000 X 4,000
6,141,896 52,355 X 52,355
4,386,314 37,390 X 37,390
IMS HEALTH INC COMMON 449934108 151,200 8,400 X 8,400
452,340 25,130 X 25,130
1,426,500 79,250 X 79,250
ISS GROUP INC COMMON 450306105 345,570 3,500 X 3,500
78,927,272 799,390 X 799,390
20,045,053 203,020 X 203,020
ITC DELTACOM INC COMMON 45031T104 21,986,738 985,400 X 985,400
5,754,840 257,920 X 257,920
ITT EDUCATIONAL SERVICES INC COMMON 45068B109 9,000,781 512,500 X 512,500
2,692,454 153,307 X 153,307
IXL ENTERPRISES INC COMMON 450718101 17,110 1,180 X 1,180
ILLINOIS TOOL WKS INC COMMON 452308109 2,280,000 40,000 X 40,000
ILLUMINET HOLDINGS INC COMMON 452334105 21,362,413 419,900 X 419,900
6,081,394 119,536 X 119,536
IMAX CORP COMMON 45245E109 5,642,000 248,000 X 248,000
Total 428,201,074
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 19
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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
IMMUNEX CORP NEW COMMON 452528102 4,479,038 90,600 X 90,600
4,202 85 X 85
INMC MTG HLDGS INC COMMON 456607100 211,575 15,600 X 15,600
7,199,775 530,859 X 530,859
2,417,109 178,220 X 178,220
INFINITY BROADCASTING CORP-A COMMON 45662S102 114,325,389 3,137,575 X 3,137,575
INET TECHNOLOGIES COMMON 45662V105 19,698,175 363,100 X 363,100
5,500,516 101,392 X 101,392
INFORMATION ARCHITECTS CORP COMMON 45669R107 1,040,625 150,000 X 150,000
INFORMATION HOLDINGS INC COMMON 456727106 17,534,300 473,900 X 473,900
7,106,849 192,077 X 192,077
INFOSPACE.COM INC COMMON 45678T102 8,961,550 162,200 X 162,200
8,564 155 X 155
INFOUSA INC. COMMON 456818301 5,350,150 823,100 X 823,100
2,256,716 347,187 X 347,187
ING GROEP N V COMMON 456837103 100,710 1,492 X 1,492
519,008 7,689 X 7,689
INSIGNIA FINANCIAL GROUP INC COMMON 45767A105 80 8 X 8
X
INTEGRATED DEVICE TECHNOLOGY COMMON 458118106 327,704,258 5,473,140 X 5,473,140
INTEL CORP COMMON 458140100 637,339,782 4,767,385 X 4,767,385
3,539,377 26,475 X 26,475
5,815,406 43,500 X 43,500
INTERIM SVCS INC COMMON 45868P100 292,875 16,500 X 16,500
883,418 49,770 X 49,770
2,736,784 154,185 X 154,185
INTERMEDIA COMMUNICATIONS INC COMMON 458801107 29,468,268 990,530 X 990,530
INTERMUNE PHARMACEUTICALS COMMON 45885B100 25,935,988 627,800 X 627,800
7,123,308 172,425 X 172,425
INTERNATIONAL BUSINESS MACHS COMMON 459200101 88,852,448 810,975 X 810,975
399,355 3,645 X 3,645
920,325 8,400 X 8,400
INTL PAPER CO COMMON 460146103 89,020 2,986 X 2,986
Total 1,327,814,940
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 20
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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
X
INTERNATIONAL RECTIFIER CORP COMMON 460254105 131,178,040 2,342,465 X 2,342,465
INTERPUBLIC GROUP COS INC COMMON 460690100 3,225,000 75,000 X 75,000
INTERWOVEN INC-RESTRICTE COMMON 46114T999 2,640 24 X 24
INTRAWARE INC COMMON 46118M103 8,561,313 533,000 X 533,000
2,413,953 150,285 X 150,285
INTUIT COMMON 461202103 335,138 8,100 X 8,100
29,966,464 724,265 X 724,265
3,102,918 74,995 X 74,995
INVENSYS PLC -SPON ADR COMMON 461204109 71,288 9,505 X 9,505
356,813 47,575 X 47,575
INVITROGEN CORP COMMON 46185R100 315,853 4,200 X 4,200
848,291 11,280 X 11,280
2,924,650 38,890 X 38,890
I2 TECHNOLOGIES INC COMMON 465754109 41,024,353 393,460 X 393,460
12,703,828 121,841 X 121,841
JDS UNIPHASE CORP COMMON 46612J101 27,559,263 229,900 X 229,900
924,956 7,716 X 7,716
1,822,100 15,200 X 15,200
JDA SOFTWARE GROUP INC COMMON 46612K108 28,902,131 1,506,300 X 1,506,300
5,113,334 266,493 X 266,493
JACK IN THE BOX INC COMMON 466367109 8,134,130 330,320 X 330,320
595,556 24,185 X 24,185
JOHNSON & JOHNSON COMMON 478160104 133,871,391 1,314,075 X 1,314,075
1,941,738 19,060 X 19,060
2,913,625 28,600 X 28,600
KLA-TENCORP CORP COMMON 482480100 103,629,858 1,769,560 X 1,769,560
KOZMO.COM, INC. COMMON 48299E959 10,570,000 1,400,000 X 1,400,000
KEANE INC COMMON 486665102 3,005,875 139,000 X 139,000
1,155,597 53,438 X 53,438
KENNAMETAL INC COMMON 489170100 12,863 600 X 600
KEYNOTE SYSTEMS INC COMMON 493308100 8,601,569 121,900 X 121,900
Total 575,784,523
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 21
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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
2,539,192 35,985 X 35,985
KIMBERLY CLARK CORP COMMON 494368103 98,955,466 1,724,714 X 1,724,714
25,793,964 449,568 X 449,568
562,275 9,800 X 9,800
KINDER MORGAN INC COMMON 49455P101 15,190,219 439,500 X 439,500
14,343 415 X 415
KING PHARMACEUTICALS INC COMMON 495582108 19,353,263 441,100 X 441,100
5,147,854 117,330 X 117,330
KONIKKLIFKE PHILIPS ELECTRS NV SCOMMON 500472204 15,910,030 334,948 X 334,948
946,533 19,927 X 19,927
KOPIN CORP COMMON 500600101 21,142,025 305,300 X 305,300
5,891,444 85,075 X 85,075
KOREA TELECOM CORP - COMMON 50063P103 758,036 15,670 X 15,670
KULICKE & SOFFA INDS INC COMMON 501242101 95,685,781 1,611,550 X 1,611,550
LAM RESH CORP COMMON 512807108 137,449,125 3,665,310 X 3,665,310
LAMSON & SESSIONS CO COMMON 513696104 7,783,497 508,310 X 508,310
826,875 54,000 X 54,000
LATTICE SEMICONDUCTOR CORP COMMON 518415104 419,227,226 6,064,770 X 6,064,770
LAUDER ESTEE COS INC COMMON 518439104 X
LEARNING TREE INTL INC COMMON 522015106 32,952,500 538,000 X 538,000
10,196,165 166,468 X 166,468
LEVEL 3 COMMUNICATIONS INC COMMON 52729N100 27,475,360 312,220 X 312,220
LEVEL 3 COMMUNICATIONS CONVERT 52729NAS9 1,791,900 1,980,000 X 1,980,000
18,100 20,000 X 20,000
LEXMARK INTL GROUP INC COMMON 529771107 139,106,625 2,068,500 X 2,068,500
LIBERTY FINL COS INC COMMON 530512102 6,340,925 289,045 X 289,045
368,221 16,785 X 16,785
LILLY ELI & CO COMMON 532457108 47,175,956 472,350 X 472,350
2,081,395 20,840 X 20,840
3,425,713 34,300 X 34,300
LINCARE HLDGS INC COMMON 532791100 221,625 9,000 X 9,000
Total 1,144,331,631
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 22
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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
677,434 27,510 X 27,510
2,092,633 84,980 X 84,980
LINCOLN NATL CORP IND COMMON 534187109 12,282,500 340,000 X 340,000
LINEAR TECHNOLOGY CORP COMMON 535678106 396,413 6,200 X 6,200
102,014,519 1,595,535 X 1,595,535
3,697,825 57,835 X 57,835
LITTELFUSE INC COMMON 537008104 8,594,600 175,400 X 175,400
2,483,957 50,693 X 50,693
LIZ CLAIBORNE INC COMMON 539320101 10,575 300 X 300
LUCENT TECHNOLOGIES INC COMMON 549463107 112,846,069 1,904,575 X 1,904,575
2,357,735 39,793 X 39,793
3,904,575 65,900 X 65,900
MBNA CORP COMMON 55262L100 3,926,344 144,750 X 144,750
MGC COMMUNICCATIONS INC COMMON 552763302 7,426,256 123,900 X 123,900
2,026,727 33,814 X 33,814
MSC INDL DIRECT INC COMMON 553530106 295,219 14,100 X 14,100
14,299,266 682,950 X 682,950
6,089,421 290,838 X 290,838
MACROMEDIA INC COMMON 556100105 106,274,066 1,099,150 X 1,099,150
MACRONIX INTL CO LTD-SP ADR COMMON 556103109 1,469,844 57,500 X 57,500
MATAV RT- MAGYAR TAVKOZLESI COMMON 559776109 95,220 2,765 X 2,765
427,610 12,417 X 12,417
MANUGISTICS GROUP INC COMMON 565011103 986,425 21,100 X 21,100
10,039,095 214,740 X 214,740
9,239,904 197,645 X 197,645
MARCHFIRST INC COMMON 566244109 51,316,993 2,811,890 X 2,811,890
MATTSON TECHNOLOGY INC COMMON 577223100 25,801,750 793,900 X 793,900
MAXIM INTEGRATED PRODS INC COMMON 57772K101 44,441,316 654,150 X 654,150
10,191 150 X 150
MAXYGEN COMMON 577776107 4,013,330 70,700 X 70,700
1,590,573 28,020 X 28,020
MAY DEPT STORES CO COMMON 577778103 29,457,000 1,227,375 X 1,227,375
Total 570,585,380
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 23
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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
MCLEODUSA INC CLASS A COMMON 582266102 9,177,389 443,620 X 443,620
14,130 683 X 683
MEAD CORP COMMON 582834107 33,745,994 1,336,475 X 1,336,475
83,073 3,290 X 3,290
MEDIAPLEX INC COMMON 58446B105 1,181,925 61,200 X 61,200
MEDICIS PHARMACEUTICAL CORP COMMON 584690309 473,100 8,300 X 8,300
1,436,685 25,205 X 25,205
4,415,505 77,465 X 77,465
MEDIMMUNE INC COMMON 584699102 4,972,800 67,200 X 67,200
4,440 60 X 60
MEDTRONIC INC COMMON 585055106 140,875,927 2,828,124 X 2,828,124
32,442,234 651,287 X 651,287
1,215,425 24,400 X 24,400
MELLON FINANCIAL COMMON 58551A108 51,013 1,400 X 1,400
MEMBERWORKS INC COMMON 586002107 39,471,715 1,173,880 X 1,173,880
11,462,258 340,885 X 340,885
MERCK & CO INC COMMON 589331107 110,257,628 1,438,925 X 1,438,925
1,592,497 20,783 X 20,783
2,314,075 30,200 X 30,200
MERCURY INTERACTIVE CORP COMMON 589405109 5,756,625 59,500 X 59,500
5,805 60 X 60
MERRILL LYNCH & CO INC COMMON 590188108 81,348,125 707,375 X 707,375
METAWAVE COMMUNICATIONS CORP COMMON 591409107 17,876,355 669,840 X 669,840
4,557,691 170,780 X 170,780
METRIS COS INC COMMON 591598107 31,915,031 1,270,250 X 1,270,250
9,583,956 381,451 X 381,451
METRO GOLDWYN MAYER INC COMMON 591610100 182,875 7,000 X 7,000
540,526 20,690 X 20,690
1,719,417 65,815 X 65,815
MICROSOFT CORP COMMON 594918104 795,950,800 9,949,385 X 9,949,385
3,942,240 49,278 X 49,278
6,520,000 81,500 X 81,500
MICROCHIP TECHNOLOGY INC COMMON 595017104 524,391 9,000 X 9,000
Total 1,355,611,649
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 24
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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
284,466,765 4,882,240 X 4,882,240
4,881,348 83,778 X 83,778
MICRON TECHNOLOGY INC COMMON 595112103 234,754,371 2,665,770 X 2,665,770
3,194,027 36,270 X 36,270
5,336,588 60,600 X 60,600
MIDCOAST ENERGY RESOURCES COMMON 59563W104 7,603,139 482,739 X 482,739
322,166 20,455 X 20,455
MICROCOSM TECHNOLOGIES INC. COMMON 595999939 7,500,001 1,173,709 X 1,173,709
MINERALS TECHNOLOGIES INC COMMON 603158106 2,438,000 53,000 X 53,000
MITCHELL ENERGY & DEV CORP COMMON 606592202 1,651,225 51,400 X 51,400
MOBIUS MANAGEMENT SOLUTIONS COMMON 606925105 2,840,156 622,500 X 622,500
MOBILITY ELECTRONICS INC COMMON 60741U101 3,250,000 250,000 X 250,000
MODIS PROFESSIONAL SERVICES INC COMMON 607830106 32,578,575 4,272,600 X 4,272,600
3,484,526 456,987 X 456,987
MOLEX INC COMMON 608554101 8,259,453 171,625 X 171,625
9,240 192 X 192
MORGAN J P & CO INC COMMON 616880100 41,002,291 372,325 X 372,325
MUELLER INDS INC COMMON 624756102 6,024,340 215,155 X 215,155
348,880 12,460 X 12,460
MUTUAL RISK MGMT LTD COMMON 628351108 8,310,866 480,050 X 480,050
555,298 32,075 X 32,075
NCO GROUP INC COMMON 628858102 252,063 10,900 X 10,900
686,813 29,700 X 29,700
2,339,209 101,155 X 101,155
NCR CORP NEW COMMON 62886E108 6,642,738 170,600 X 170,600
7,203 185 X 185
NTL INC COMMON 629407107 4,700,188 78,500 X 78,500
CONVERT 629407AN7 31,750,000 40,000,000 X 40,000,000
NTT DOCOMO INC COMMON 62942M201 184,461 1,360 X 1,360
977,913 7,210 X 7,210
NABISCO GROUP HOLDINGS COMMON 62952P102 15,563 600 X 600
ELEC & ELTEK INT CO LTD COMMON 6298188 112,950 45,000 X 45,000
Total 706,480,353
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 25
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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
NATIONAL BANK OF GREECE-ADR COMMON 633643408 24,063 3,080 X 3,080
NATIONAL INSTRS CORP COMMON 636518102 503,869 11,550 X 11,550
1,454,239 33,335 X 33,335
4,549,651 104,290 X 104,290
NATIONAL-OILWELL INC COMMON 637071101 20,671,800 628,800 X 628,800
5,840,573 177,660 X 177,660
NATIONAL SEMICONDUCTOR CORP COMMON 637640103 225,791,793 3,978,710 X 3,978,710
NAVIGANT CONSULTING CO COMMON 63935N107 17,902,275 4,212,300 X 4,212,300
NESTLE S A COMMON 641069406 135,533 1,350 X 1,350
658,086 6,555 X 6,555
NETWORK APPLIANCE INC COMMON 64120L104 31,572,100 392,200 X 392,200
768,212 9,543 X 9,543
1,634,150 20,300 X 20,300
NETWORKS PLUS CORP COMMON 64122D506 1,835,863 129,400 X 129,400
1,372,144 96,715 X 96,715
NEW ERA OF NETWORKS INC COMMON 644312100 4,250,000 100,000 X 100,000
NEWFIELD EXPL CO COMMON 651290108 269,963 6,900 X 6,900
750,222 19,175 X 19,175
2,530,409 64,675 X 64,675
NEWPORT NEWS SHIPBUILDING INC COMMON 652228107 5,835,900 158,800 X 158,800
2,205 60 X 60
NICE SYSTEMS LTD-SPONS ADR COMMON 653656108 1,103,781 14,300 X 14,300
NIPPON TELEG & TEL CORP COMMON 654624105 205,809 3,010 X 3,010
1,078,274 15,770 X 15,770
NOKIA CORP-SPONSORED ADR A COMMON 654902204 65,001,147 1,301,650 X 1,301,650
NORFOLK SOUTHERN CORP COMMON 655844108 5,950 400 X 400
NORTEL NETWORKS CORP (HLDG) COMMON 656568102 126,969,912 1,860,365 X 1,860,365
863,363 12,650 X 12,650
2,477,475 36,300 X 36,300
NOVA CORP GA COMMON 669784100 374,363 13,400 X 13,400
39,545,420 1,415,496 X 1,415,496
15,129,665 541,554 X 541,554
Total 581,108,205
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 26
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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
NOVARTIS A G COMMON 66987V109 79,200 1,980 X 1,980
409,040 10,226 X 10,226
NOVELLUS SYS INC COMMON 670008101 595,111,031 10,521,300 X 10,521,300
NYFIX INC COMMON 670712108 12,149,944 289,716 X 289,716
3,673,473 87,594 X 87,594
OLYMPIC STEEL INC COMMON 68162K106 2,295,230 655,780 X 655,780
94,430 26,980 X 26,980
OMNICARE INC COMMON 681904108 67,063 7,400 X 7,400
5,690,897 627,961 X 627,961
988,991 109,130 X 109,130
ONI SYSTEMS CORP COMMON 68273F103 7,782,288 66,400 X 66,400
ONYX SOFTWARE CORP COMMON 683402101 16,455,781 554,300 X 554,300
3,596,641 121,150 X 121,150
ORACLE CORP COMMON 68389X105 94,168,914 1,120,225 X 1,120,225
2,023,384 24,070 X 24,070
2,908,563 34,600 X 34,600
OUTBACK STEAKHOUSE INC COMMON 689899102 3,510,000 120,000 X 120,000
OXFORD HEALTH PLANS INC COMMON 691471106 252,413 10,600 X 10,600
11,498,342 482,870 X 482,870
2,902,982 121,910 X 121,910
PC-TEL INC COMMON 69325Q105 18,053,800 475,100 X 475,100
5,334,022 140,369 X 140,369
P-COM INC. COMMON 693262107 113,750 20,000 X 20,000
333,430 58,625 X 58,625
994,431 174,845 X 174,845
PE CORP-PE BIOSYSTEMS GROUP COMMON 69332S102 4,631,013 70,300 X 70,300
4,611 70 X 70
PE CORP-CELERA GENOMICS GRP COMMON 69332S201 184 2 X 2
PMC-SIERRA INC COMMON 69344F106 33,334,175 187,600 X 187,600
946,897 5,329 X 5,329
1,528,113 8,600 X 8,600
PACTIV CORPORATION COMMON 695257105 1,575 200 X 200
PARAMETRIC TECHNOLOGY CORP COMMON 699173100 113,703,700 10,336,700 X 10,336,700
Total 944,638,304
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 27
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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
PATINA OIL & GAS CORP COMMON 703224105 3,154,000 152,000 X 152,000
PAYCHEX INC COMMON 704326107 9,958,200 237,100 X 237,100
9,240 220 X 220
PEGASUS COMMUNICATIONS CORP COMMON 705904100 8,298,922 169,150 X 169,150
PEGASUS COMMUNICATIONS CONVERT 705904506 6,083,366 69,425 X 69,425
50,384 575 X 575
PENTON MEDIA INC COMMON 709668107 563,500 16,100 X 16,100
7,536,200 215,320 X 215,320
6,938,400 198,240 X 198,240
PEPSICO INC COMMON 713448108 85,388,878 1,921,550 X 1,921,550
177,395 3,992 X 3,992
PEREGRINE SYSTEMS INC COMMON 71366Q101 450,938 13,000 X 13,000
5,423,564 156,355 X 156,355
4,251,994 122,580 X 122,580
PERFORMANCE FOOD GROUP CO COMMON 713755106 13,708,800 428,400 X 428,400
6,021,216 188,163 X 188,163
PERSONNEL GROUP AMER INC COMMON 715338109 1,359,181 462,700 X 462,700
896,637 305,238 X 305,238
PETROLEO BRASILEIRO SA PETROBR COMMON 71654V101 1,504,505 49,800 X 49,800
PFIZER INC COMMON 717081103 152,539,200 3,177,900 X 3,177,900
3,093,600 64,450 X 64,450
5,073,600 105,700 X 105,700
PHILIP MORRIS COS INC COMMON 718154107 79,888,578 3,007,570 X 3,007,570
23,494,611 884,503 X 884,503
PHONE.COM INC COMMON 71920Q100 26,851,038 412,300 X 412,300
596,806 9,164 X 9,164
944,313 14,500 X 14,500
PHOTON DYNAMICS INC COMMON 719364101 23,675,938 317,000 X 317,000
6,564,359 87,891 X 87,891
PINNACLE HOLDINGS COMMON 72346N101 28,868,400 534,600 X 534,600
7,911,000 146,500 X 146,500
PITNEY BOWES INC COMMON 724479100 203,294,800 5,082,370 X 5,082,370
PITTSTON BRINKS GROUP COMMON 725701106 5,934,845 433,596 X 433,596
Total 730,506,405
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 28
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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
366,469 26,774 X 26,774
POGO PRODUCING CO COMMON 730448107 4,593,770 207,628 X 207,628
2,428,352 109,756 X 109,756
POHANG IRON & STL LTD COMMON 730450103 1,037,520 43,230 X 43,230
168,960 7,040 X 7,040
PORTAL SOFTWARE COMMON 736126103 9,472,663 148,300 X 148,300
POWER INTEGRATIONS INC COMMON 739276103 287,463 12,200 X 12,200
839,296 35,620 X 35,620
2,690,484 114,185 X 114,185
POWERTEL INC COMMON 73936C109 42,527,031 599,500 X 599,500
12,160,816 171,430 X 171,430
PRAECIS PHARMACEUTICALS INC. COMMON 739421105 14,414,163 517,100 X 517,100
3,916,187 140,491 X 140,491
PRE PAID LEGAL SVCS INC COMMON 740065107 15,771,013 527,900 X 527,900
4,543,599 152,087 X 152,087
PREMIER PKS INC COMMON 740540208 27,463,800 1,207,200 X 1,207,200
7,684,336 337,773 X 337,773
PRICE COMMUNICATIONS CORP COMMON 741437305 49,343,177 2,094,140 X 2,094,140
4,408,880 187,114 X 187,114
PRIDE INTL INC COMMON 741932107 17,127,000 692,000 X 692,000
4,376,889 176,844 X 176,844
PRIORITY HEALTHCARE CORP COMMON 74264T102 33,143,375 446,000 X 446,000
9,717,994 130,772 X 130,772
PROCTER & GAMBLE CO COMMON 742718109 56,147,938 980,750 X 980,750
668,680 11,680 X 11,680
1,110,650 19,400 X 19,400
PROFESSIONAL STAFF-SPON COMMON 74315R105 121,500 27,000 X 27,000
PROVINCE HEALTHCARE CO COMMON 743977100 20,894,339 578,390 X 578,390
6,866,134 190,066 X 190,066
PROXIM INC COMMON 744284100 31,749,175 320,800 X 320,800
9,581,066 96,809 X 96,809
PSINET INC COMMON 74437C101 291,450 11,600 X 11,600
18,256,076 726,610 X 726,610
Total 414,170,242
6/30/2000 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
2,710,736 107,890 X 107,890
CONVERT 74437C408 8,399,016 246,125 X 246,125
63,984 1,875 X 1,875
PSI TECHNOLOGIES HOLDINGS-ADR COMMON 74438Q109 6,789,400 327,200 X 327,200
QLT, INC. COMMON 746927102 819,513 10,600 X 10,600
5,502,717 71,175 X 71,175
10,410,283 134,652 X 134,652
QUALCOMM INC COMMON 747525103 7,152,000 119,200 X 119,200
245,940 4,099 X 4,099
528,000 8,800 X 8,800
QUEST SOFTWARE INC COMMON 74834T103 50,036,850 903,600 X 903,600
6,989,156 126,215 X 126,215
QUICKLOGIC CORP COMMON 74837P108 18,171,575 816,700 X 816,700
QWEST COMMUNICATIONS INTL COMMON 749121109 117,896,818 2,372,766 X 2,372,766
28,679,728 577,202 X 577,202
RSA SECURITY INC. COMMON 749719100 8,628,550 124,600 X 124,600
8,656 125 X 125
RWE AG COMMON 74975E303 34 1 X 1
RADIOSHACK CORPORATION COMMON 750438103 101,474,171 2,141,935 X 2,141,935
30,863,154 651,465 X 651,465
RATIONAL SOFTWARE CORP COMMON 75409P202 399,631 4,300 X 4,300
248,373,610 2,672,480 X 2,672,480
3,753,746 40,390 X 40,390
RAYTHEON CO COMMON 755111309 2,410 124 X 124
755111408 23,870 1,240 X 1,240
READERS DIGEST ASSN INC COMMON 755267101 13,721,700 345,200 X 345,200
11,726 295 X 295
REDBACK NETWORKS COMMON 757209101 27,155,350 151,600 X 151,600
29,914 167 X 167
REMEC INC COMMON 759543101 31,582,125 754,200 X 754,200
9,850,675 235,240 X 235,240
REMEDY CORP COMMON 759548100 964,475 17,300 X 17,300
93,047,865 1,669,020 X 1,669,020
9,025,368 161,890 X 161,890
Total 843,312,745
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 30
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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
RENT WAY INC COMMON 76009U104 12,306,413 421,633 X 421,633
910,358 31,190 X 31,190
RJ REYNOLDS TOBACCO HOLDINGS, INCCOMMON 76182K105 5,588 200 X 200
RITEK CORP -GDR- W/I COMMON 767767304 57,606 7,246 X 7,246
ROCHE HOLDINGS LTD COMMON 771195104 114,751 1,175 X 1,175
590,844 6,050 X 6,050
ROGERS COMMUNICATIONS - CL B COMMON 775109200 367,650 12,900 X 12,900
54,949,710 1,928,060 X 1,928,060
3,467,453 121,665 X 121,665
ROYAL BANK OF CANADA COMMON 780087102 171,603 3,320 X 3,320
ROYAL DUTCH PETE CO COMMON 780257804 87,423,367 1,420,075 X 1,420,075
ROYAL OAK MINES INC COMMON 78051D105 32 8,204 X 8,204
ROYAL OAK MINES COMMON 78051D998 390 39,007 X 39,007
RURAL CELLULAR CORP - CL A COMMON 781904107 451,719 5,900 X 5,900
74,814,578 977,170 X 977,170
21,072,373 275,231 X 275,231
SBC COMMUNICATIONS INC COMMON 78387G103 100,989,615 2,335,020 X 2,335,020
SCG HOLDING CORP COMMON 783884109 179,375 8,200 X 8,200
67,970,219 3,107,210 X 3,107,210
1,667,969 76,250 X 76,250
SBA COMMUNICATIONS CORP COMMON 78388J106 25,937,588 499,400 X 499,400
7,003,253 134,840 X 134,840
SCI SYS INC COMMON 783890106 308,240,646 7,865,790 X 7,865,790
SDL INC COMMON 784076101 20,818,688 73,000 X 73,000
807,651 2,832 X 2,832
1,511,494 5,300 X 5,300
SK TELECOM CO LTD-ADR COMMON 78440P108 1,512,416 41,650 X 41,650
SPX CORP COMMON 784635104 16,689 138 X 138
SSI LTD - 144A SP GDR COMMON 784663106 458,500 70,000 X 70,000
SABRE GROUP HLDGS INC COMMON 785905100 10 X
Total 793,818,544
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 31
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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
SAFEWAY INC COMMON 786514208 89,759,025 1,994,645 X 1,994,645
29,165,175 648,115 X 648,115
ST PAUL COS INC COMMON 792860108 86,180,060 2,525,423 X 2,525,423
29,113,300 853,137 X 853,137
SANMINA CORP COMMON 800907107 350,550 4,100 X 4,100
96,887,403 1,133,186 X 1,133,186
3,308,850 38,700 X 38,700
SARA LEE CORP COMMON 803111103 13,519 700 X 700
111,800 5,789 X 5,789
SAWTEK INC COMMON 805468105 259,031 4,500 X 4,500
160,400,497 2,786,545 X 2,786,545
11,396,512 197,985 X 197,985
SCHERING PLOUGH CORP COMMON 806605101 57,851,538 1,145,575 X 1,145,575
SCHLUMBERGER LTD COMMON 806857108 105,185,803 1,409,525 X 1,409,525
1,394,368 18,685 X 18,685
2,335,763 31,300 X 31,300
SCHOLASTIC CORP COMMON 807066105 195,600 3,200 X 3,200
540,345 8,840 X 8,840
1,820,303 29,780 X 29,780
SCHWEITZER-MAUDUIT INTL INC COMMON 808541106 8,750 700 X 700
SCIENTIFIC ATLANTA INC COMMON 808655104 9,685,000 130,000 X 130,000
8,568 115 X 115
SEARS ROEBUCK & CO COMMON 812387108 1,631 50 X 50
SELECTICA INC COMMON 816288104 13,634,163 194,600 X 194,600
3,587,130 51,199 X 51,199
SELIGMAN CAPITAL FD INC COMMON 816326102 1,590,175 45,576 X 45,576
SELIGMAN COM STK FD INC COMMON 816332100 308,462 21,199 X 21,199
SELIGMAN COMM&INFO FD COMMON 816333108 698,185 14,243 X 14,243
SELIGMAN FRONTIER FD INC COMMON 816334106 204,169 11,646 X 11,646
SELIGMAN GROWTH FD INC COMMON 816335103 763,766 79,969 X 79,969
SELIGMAN US GOVT SECS FD- A COMMON 816336101 397,490 60,426 X 60,426
Total 707,156,929
6/30/2000 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
SELIGMAN HIGH YIELD BOND FUND COMMON 816336309 1,183,526 204,718 X 204,718
SELIGMAN INTERNATIONAL GROWTH FDCOMMON 81633C108 887,657 53,607 X 53,607
SELIGMAN GLB SMALLER COMPANIES FDCOMMON 81633C207 849,335 44,256 X 44,256
SELIGMAN EMERGING MKTS FD COMMON 81633C702 477,583 62,093 X 62,093
SELIGMAN GLB GROWTH FUND COMMON 81633C884 103,655 7,274 X 7,274
SELIGMAN LARGE CAP VALUE FD INC COMMON 816356109 744,196 79,183 X 79,183
SELIGMAN SMALL CAP VALUE-A COMMON 816356406 576,361 71,695 X 71,695
SEMTECH CORP COMMON 816850101 718,953 9,400 X 9,400
2,035,632 26,615 X 26,615
6,712,651 87,765 X 87,765
SENSORMATIC ELECTRS CORP COMMON 817265101 32,946,925 2,083,600 X 2,083,600
SHERWIN WILLIAMS CO COMMON 824348106 14,831 700 X 700
SIEBEL SYS INC COMMON 826170102 57,369,547 350,750 X 350,750
1,412,689 8,637 X 8,637
2,289,875 14,000 X 14,000
SILICON LABORATORIES INC COMMON 826919102 9,233,125 173,800 X 173,800
9,297 175 X 175
SILICON IMAGE INC. COMMON 82705T102 2,344,125 47,000 X 47,000
684,983 13,734 X 13,734
SILICONWARE PRECISI-TEMP ADR COMMON 827084872 1,480,000 160,000 X 160,000
SILVERLINE TECHNOLOGIES - ADR COMMON 828408104 616,313 28,500 X 28,500
SMARTFORCE PUBLIC LIMITED CO COMMON 83170A206 480,000 10,000 X 10,000
19,099,680 397,910 X 397,910
11,609,856 241,872 X 241,872
SMITHKLINE BEECHAM COMMON 832378301 127,442 1,955 X 1,955
654,157 10,035 X 10,035
SNYDER COMMUNICATIONS INC COMMON 832914105 705,375 29,700 X 29,700
2,041,313 85,950 X 85,950
6,614,375 278,500 X 278,500
SNOWBALL.COM INC COMMON 83335R102 962,813 197,500 X 197,500
Total 164,986,267
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 33
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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
SOCIETE GENERALE FRANCE COMMON 83364L109 113,897 9,430 X 9,430
608,134 50,350 X 50,350
SOFTWARE.COM INC COMMON 83402P104 15,773,319 121,450 X 121,450
16,234 125 X 125
SONICWALL INC COMMON 835470105 29,183,913 331,400 X 331,400
8,557,473 97,175 X 97,175
SPECTRASITE HOLDINGS INC COMMON 84760T100 309,288 10,900 X 10,900
905,304 31,905 X 31,905
2,892,831 101,950 X 101,950
SPRINT CORP COMMON 852061100 46,578,300 913,300 X 913,300
STATE STR CORP COMMON 857477103 74,244 700 X 700
STET HELLAS TELECOMM SA COMMON 859823106 1,454,850 73,200 X 73,200
STEWART & STEVENSON SVCS INC COMMON 860342104 12,546,565 832,967 X 832,967
682,407 45,305 X 45,305
ST MICROELECTRONICS COMMON 861012102 54,565,794 850,100 X 850,100
STORAGENETWORKS INC COMMON 86211E103 9,025 100 X 100
8,988,900 99,600 X 99,600
72,200 800 X 800
STRYKER CORP COMMON 863667101 13,807,500 315,600 X 315,600
14,000 320 X 320
SUMMIT BANCORP COMMON 866005101 76,150,350 3,092,400 X 3,092,400
21,855,919 887,550 X 887,550
SUN MICROSYSTEMS INC COMMON 866810104 55,544,625 610,800 X 610,800
645,656 7,100 X 7,100
1,373,156 15,100 X 15,100
SUNGARD DATA SYS INC COMMON 867363103 629,300 20,300 X 20,300
230,918,845 7,448,995 X 7,448,995
16,387,871 528,641 X 528,641
SURGUTNEFTEGAZ COMMON 868861204 975,333 73,200 X 73,200
SYBASE INC COMMON 871130100 609,500 26,500 X 26,500
1,743,630 75,810 X 75,810
5,719,640 248,680 X 248,680
SYBRON INTL CORP COMMON 87114F106 360,588 18,200 X 18,200
Total 610,068,590
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 34
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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
971,308 49,025 X 49,025
3,356,337 169,405 X 169,405
SYCAMORE NETWORKS INC COMMON 871206108 54,712,888 495,700 X 495,700
885,649 8,024 X 8,024
1,799,113 16,300 X 16,300
SYMANTEC CORP COMMON 871503108 420,713 7,800 X 7,800
289,325,335 5,364,085 X 5,364,085
3,925,571 72,780 X 72,780
SYMBOL TECHNOLOGIES INC COMMON 871508107 28,402,650 525,975 X 525,975
23,436 434 X 434
SYNOPSYS INC COMMON 871607107 228,883,762 6,622,315 X 6,622,315
2,765 80 X 80
SYNTROLEUM CORP COMMON 871630109 75,350 4,400 X 4,400
10,275 600 X 600
TDK CORP-SPONSORED ADR COMMON 872351408 123,911 865 X 865
614,543 4,290 X 4,290
T&HQ INC COMMON 872443403 4,170,563 342,200 X 342,200
1,294,898 106,248 X 106,248
TJX COS INC NEW COMMON 872540109 2,812,500 150,000 X 150,000
TV GUIDE INC - CL A COMMON 87307Q109 25,023,050 730,600 X 730,600
856 25 X 25
TAIWAN SEMICONDUCTOR MFG LTD-ADR COMMON 874039100 3,552,484 91,677 X 91,677
TAIWAN SEMICONDUCTOR-ADR NEW COMMON 874039209 17,015,400 438,400 X 438,400
TANOX INC COMMON 87588Q109 17,671,219 373,500 X 373,500
5,184,977 109,590 X 109,590
TEKELEC COMMON 879101103 18,190,781 377,500 X 377,500
5,393,145 111,920 X 111,920
TELE CELULAR SUL PART-ADR COMMON 879238103 601,825 13,300 X 13,300
BRASIL TELECOM PAR COMMON 879239101 891,363 12,200 X 12,200
TELE CENTRO OESTE CEL -ADR COMMON 87923P105 1,080,000 90,000 X 90,000
TELESP PARTICIPACOES SA-ADR COMMON 87929A102 1,128,500 61,000 X 61,000
TELEFONICA DE ESPANA S A COMMON 879382208 17,557,705 274,072 X 274,072
Total 735,102,869
6/30/2000 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
746,565 11,654 X 11,654
TELEFONOS DE MEXICO S A COMMON 879403780 1,473,825 25,800 X 25,800
TELLABS INC COMMON 879664100 35,634,722 520,690 X 520,690
TELSTRA CORP-ADR (FINAL) COMMON 87969N204 46,464 2,246 X 2,246
224,604 10,857 X 10,857
TENNECO AUTOMOTIVE COMMON 880349105 210 40 X 40
TERADYNE INC COMMON 880770102 227,295,810 3,092,460 X 3,092,460
TEVA PHARMACEUTICAL-SP ADR COMMON 881624209 4,329,669 78,100 X 78,100
TEXACO INC COMMON 881694103 80,337,530 1,508,686 X 1,508,686
23,142,557 434,602 X 434,602
3DO CO COMMON 88553W105 20,429,047 2,604,500 X 2,604,500
TICKETMASTER ONLINE-CITY B COMMON 88633P203 1,504,500 94,400 X 94,400
TIME WARNER INC COMMON 887315109 90,379,200 1,189,200 X 1,189,200
TITAN CORPORATION COMMON 888266103 183,475 4,100 X 4,100
537,448 12,010 X 12,010
1,724,218 38,530 X 38,530
TOO INC. COMMON 890333107 310,338 12,200 X 12,200
7,029,017 276,325 X 276,325
3,911,779 153,780 X 153,780
TOTAL FINA ELF SA SPON ADR COMMON 89151E109 146,328 1,905 X 1,905
734,251 9,559 X 9,559
TRANSWITCH CORP COMMON 894065101 15,109,453 195,750 X 195,750
4,182,019 54,180 X 54,180
TRICON GLOBAL RESTAURANTS COMMON 895953107 2,260 80 X 80
TRIBUNE CO NEW COMMON 896047107 21,000 600 X 600
TRITON PCS HOLDINGS INC CL A COMMON 89677M106 17,244,150 298,600 X 298,600
4,551,278 78,810 X 78,810
TRUE NORTH COMMUNICATIONS INC COMMON 897844106 7,244,820 164,655 X 164,655
409,640 9,310 X 9,310
TUBOS DE ACERO DE MEX COMMON 898592506 971,250 70,000 X 70,000
Total 549,857,423
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 36
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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
TUT SYSTEMS INC COMMON 901103101 72,465 1,263 X 1,263
TYCO INTL LTD NEW COMMON 902124106 84,342,092 1,780,308 X 1,780,308
3,341,122 70,525 X 70,525
5,476,550 115,600 X 115,600
UST INC COMMON 902911106 5,875 400 X 400
USA NETWORKS INC COMMON 902984103 33,780,413 1,562,100 X 1,562,100
US UNWIRED INC CL -A COMMON 90338R104 8,944,000 688,000 X 688,000
2,656,485 204,345 X 204,345
UNILEVER N V COMMON 904784709 23,048 536 X 536
UNICOM CORP COMMON 904911104 55,394,697 1,431,850 X 1,431,850
UNIGRAPHICS SOLUTIONS INC COMMON 904928108 3,178,500 163,000 X 163,000
UNION PAC RES GROUP INC COMMON 907834105 13,200 600 X 600
UNITED TECHNOLOGIES CORP COMMON 913017109 235,636,001 4,002,310 X 4,002,310
30,102,493 511,295 X 511,295
UNITED THERAPEUTICS CORP COMMON 91307C102 26,681,925 246,200 X 246,200
7,850,252 72,436 X 72,436
UNITEDGLOBALCOM INC COMMON 913247508 9,228,450 197,400 X 197,400
UNITEDHEALTH GROUP COMMON 91324P102 117,491,220 1,370,160 X 1,370,160
28,281,636 329,815 X 329,815
URBAN OUTFITTERS INC COMMON 917047102 3,355,712 380,790 X 380,790
165,763 18,810 X 18,810
VALASSIS COMMUNICATIONS INC COMMON 918866104 38 1 X 1
VALERO ENERGY CORP NEW COMMON 91913Y100 8,057,833 253,790 X 253,790
745,744 23,488 X 23,488
VARIAN SEMICONDUCTOR EQUIP COMMON 922207105 533,906 8,500 X 8,500
14,053,669 223,740 X 223,740
8,420,016 134,050 X 134,050
VEECO INSTRS INC DEL COMMON 922417100 114,422,360 1,562,080 X 1,562,080
VENCOR INC COMMON 92260R102 45 414 X 414
VENTIV HEALTH INC COMMON 922793104 X
Total 802,255,508
6/30/2000 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
- X -
X
VERITAS SOFTWARE CO COMMON 923436109 19,828,591 175,450 X 175,450
737,483 6,526 X 6,526
1,443,775 12,775 X 12,775
VERISIGN COMMON 92343E102 54,159,025 306,850 X 306,850
1,180,432 6,688 X 6,688
1,870,900 10,600 X 10,600
VIATEL INC COMMON 925529208 229 8 X 8
VIRATA CORPORATION COMMON 927646109 27,564,638 462,300 X 462,300
7,972,459 133,710 X 133,710
VISHAY INTERTECHNOLOGY INC COMMON 928298108 206,485,466 5,442,780 X 5,442,780
VISTEON CORP COMMON 92839U107 3,484,531 287,384 X 287,384
530,675 43,767 X 43,767
VISUAL NETWORKS INC COMMON 928444108 13,885,200 487,200 X 487,200
3,288,159 115,374 X 115,374
VITESSE SEMICONDUCTOR CORP COMMON 928497106 20,413,594 277,500 X 277,500
18,023 245 X 245
VIVENDI (EX-GEN EAUX) SP ADR COMMON 92851S105 64,865 3,660 X 3,660
329,996 18,620 X 18,620
VODAFONE AIRTOUCH PLC-SP ADR COMMON 92857T107 235,945 5,694 X 5,694
1,126,561 27,187 X 27,187
WPP GROUP PLC COMMON 929309300 94,413 1,300 X 1,300
480,124 6,611 X 6,611
WABASH NATL CORP COMMON 929566107 12 1 X 1
WAL MART STORES INC COMMON 931142103 154,628,044 2,683,350 X 2,683,350
1,507,931 26,168 X 26,168
2,005,350 34,800 X 34,800
WAL-MART DE MEXICO SA -SP ADR COMMON 93114W107 824,927 35,150 X 35,150
WASHINGTON MUT INC COMMON 939322103 84,385,022 2,922,425 X 2,922,425
22,861,435 791,738 X 791,738
WASTE CONECTIONS INC COMMON 941053100 14,938,900 756,400 X 756,400
4,251,978 215,290 X 215,290
Total 650,598,680
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 38
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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
WATSON PHARMACEUTICALS INC COMMON 942683103 494,500 9,200 X 9,200
64,554,288 1,201,010 X 1,201,010
5,553,181 103,315 X 103,315
1,849,000 34,400 X 34,400
WEATHERFORD INTERNATIONAL COMMON 947074100 11,107,688 279,000 X 279,000
11,944 300 X 300
WELLS FARGO CO COMMON 949746101 2,604,000 67,200 X 67,200
WEST TELESERVICES CORP COMMON 956188106 16,136,719 637,500 X 637,500
4,720,781 186,500 X 186,500
WESTERN WIRELESS CORP COMMON 95988E204 69,340,350 1,272,300 X 1,272,300
19,553,347 358,777 X 358,777
WET SEAL INC COMMON 961840105 3,810,463 290,321 X 290,321
311,522 23,735 X 23,735
WILLIAMS COS INC DEL COMMON 969457100 131,501,134 3,154,450 X 3,154,450
1,445,723 34,680 X 34,680
2,401,200 57,600 X 57,600
WILLIAMS-SONOMA INC COMMON 969904101 386,006 11,900 X 11,900
1,113,742 34,335 X 34,335
3,608,834 111,255 X 111,255
WIND RIVER SYSTEMS INC COMMON 973149107 10,972,388 289,700 X 289,700
WORLD ACCESS INC COMMON 98141A101 1,085,950 98,165 X 98,165
6,084 550 X 550
WORLDCOM INC COMMON 98157D106 135,257,850 2,948,400 X 2,948,400
1,338,403 29,175 X 29,175
2,202,000 48,000 X 48,000
XILINX INC COMMON 983919101 57,562,575 697,200 X 697,200
1,429,570 17,315 X 17,315
2,633,744 31,900 X 31,900
XIRCOM INC COMMON 983922105 170,069,475 3,580,410 X 3,580,410
XEROX CORP COMMON 984121103 10,707 516 X 516
26,664 1,285 X 1,285
YAGEO CORP - 144A COMMON 984326108 71,650 9,292 X 9,292
YUPI INTERNET INC SER C COMMON 988996997 7,000,004 608,696 X 608,696
Total 730,171,484
6/30/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 39
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
ZIFF-DAVIS INC COMMON 989511100 9,357,300 1,039,700 X 1,039,700
ZIFF DAVIS INC - ZDNET COMMON 989511209 11,094,300 1,232,700 X 1,232,700
BAYERISCHE MOTOREN WERKE AG COMMON D12096125 100,300 3,400 X 3,400
552,830 18,740 X 18,740
ACE LTD COMMON G0070K103 352,800 12,600 X 12,600
21,799,400 778,550 X 778,550
3,334,520 119,090 X 119,090
AMDOCS LTD COMMON G02602103 60,357,735 786,420 X 786,420
CHINADOTCOM CORP - CL A COMMON G2108N109 613,125 30,000 X 30,000
CORECOMM LIMITED COMMON G2422R109 4,500,600 230,800 X 230,800
1,335,750 68,500 X 68,500
FRESH DEL MONTE PRODUCE INC COMMON G36738105 5,303,169 771,370 X 771,370
256,678 37,335 X 37,335
GLOBAL CROSSING LTD COMMON G3921A100 2,631,250 100,000 X 100,000
GLOBAL CROSSING CONVERTIBLE PFD 7CONVERT G3921A142 6,938,306 38,175 X 38,175
163,575 900 X 900
RENAISSANCE RE HLDGS LTD COMMON G7496G103 7,746,284 177,820 X 177,820
604,648 13,880 X 13,880
HILFIGER TOMMY CORP COMMON G8915Z102 6,750 900 X 900
TRANSOCEAN SEDCO FOREX INC COMMON G90078109 336,656 6,300 X 6,300
986,349 18,458 X 18,458
3,116,208 58,315 X 58,315
SBS BROADCASTING SA COMMON L8137F102 299,750 5,500 X 5,500
7,516,640 137,920 X 137,920
5,267,316 96,648 X 96,648
ALADDIN KNOWLEDGE SYSTEMS COMMON M0392N101 632,500 40,000 X 40,000
AUDIOCODES LTD COMMON M15342104 1,896,000 15,800 X 15,800
CHECK POINT SOFTWARE TECH LTD COMMON M22465104 227,408,913 1,073,950 X 1,073,950
COMMTOUCH SOFTWARE LTD COMMON M25596103 650,000 20,000 X 20,000
E-SIMS LTD COMMON M40990109 824,850 84,600 X 84,600
Total 385,984,501
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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
GALILEO TECHNOLOGY LTD COMMON M47298100 7,774,400 361,600 X 361,600
GILAT SATELLITE NETWORKS LTD COMMON M51474100 56,584,331 815,630 X 815,630
NOVA MEASURING INSTRUMENTS COMMON M7516K103 6,425,000 400,000 X 400,000
ORBOTECH LTD COMMON M75253100 261,079,984 2,811,090 X 2,811,090
6,064,273 65,295 X 65,295
RADVISION LTD COMMON M81869105 838,125 30,000 X 30,000
TECNOMATIX TECHNOLOGIES LTD COMMON M8743P105 3,551,901 260,690 X 260,690
TTI TEAM TELECOM INTL LTD COMMON M88258104 1,317,600 36,600 X 36,600
ASM INTERNATIONAL N.V. COMMON N07045102 13,250,000 500,000 X 500,000
ASM LITHOGRAPHY HOLDING NV ADR COMMON N07059111 31,218,438 707,500 X 707,500
MADGE NETWORKS N.V. COMMON N5424G106 46 10 X 10
SAPIENS INTL CORP COMMON N7716A102 474,069 75,100 X 75,100
AL-AHRAM BEVERAGES CO -GDR COMMON US0102032 566,825 32,800 X 32,800
BORSODCHEM RT-SPONSORED GDR COMMON US1000642 629,696 20,300 X 20,300
GRUPO TELEVISA SA-SPONS COMMON US40049J2 1,158,150 16,800 X 16,800
HON HAI PRECISION INDUSTRY CO. COMMON US4380902 10,607,129 587,500 X 587,500
MAHANAGAR TELE NIGAM COMMON US5597782 905,796 94,300 X 94,300
PLIVA D.D. - GDR REG S COMMON US72917Q2 437,305 40,650 X 40,650
SAMSUNG ELECTRONICS COMMON US7960502 35,047 478 X 478
US7960508 19,543,644 118,108 X 118,108
TELEKOMUNIKACJA POLSKA- COMMON US87943D2 464,231 64,800 X 64,800
TURKIYE IS BANKASI COMMON US9001512 108,188 50,320 X 50,320
UNIAO DE BANCOS BRASILIEROS COMMON US90458E1 917,125 31,900 X 31,900
VIDESH SANCHAR NIGAM-SP COMMON US92659G1 463,036 34,200 X 34,200
OTP BANK COMMON USX607461 732,813 14,000 X 14,000
LARSEN & TOUBRO LTD. COMMON USY5217N1 785,433 71,100 X 71,100
Total 425,932,585
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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
VIDESH SANCHAR NIGAM LTD-GDR COMMON USY9371X1 20,038 1,480 X 1,480
YAGEO CORPORATION COMMON USY9723R1 2,492,661 323,263 X 323,263
ASE TEST LIMITED COMMON Y02516105 6,411,488 217,800 X 217,800
CREATIVE TECHNOLOGY LTD COMMON Y1775U107 207,251,713 8,680,700 X 8,680,700
FLEXTRONICS INTL LTD COMMON Y2573F102 79,332,689 1,154,980 X 1,154,980
Total 295,508,587
Grand Total 29,649,657,581
Total Number of Securities 703
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