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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: March 31, 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 March 31, 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: 741
Form 13F Information Table Value Total: $31,333,997,747
List of Other Included Managers:
No. 13F File Number Name
01 28-3314 Seligman Henderson Co.
<PAGE>
<TABLE>
<CAPTION>
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C>
3/31/2000 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 5,454,094 623,325 X 623,325
350,350 40,040 X 40,040
A D C TELECOMMUNICATIONS COMMON 000886101 56,083,875 1,041,000 X 1,041,000
ACT MFG INC COMMON 000973107 36,571,938 653,800 X 653,800
AFLAC INC COMMON 001055102 13,841,888 303,800 X 303,800
277,020 6,080 X 6,080
AES CORP COMMON 00130H105 92,062,688 1,169,050 X 1,169,050
3,274,425 41,580 X 41,580
4,354,875 55,300 X 55,300
AMFM INC COMMON 001693100 454,812,590 7,320,927 X 7,320,927
178,609 2,875 X 2,875
AMFM INC PFD CONV 7% CONVERT 001693209 427,975 1,900 X 1,900
AT&T CORP COMMON 001957109 128,198,222 2,276,550 X 2,276,550
AT&T CORP - LIBERTY MEDIA COMMON 001957208 61,738,381 1,040,900 X 1,040,900
ATMI INC COMMON 00207R101 6,446,250 135,000 X 135,000
AVX CORP NEW COMMON 002444107 629,244 8,300 X 8,300
48,189,837 635,645 X 635,645
19,467,968 256,791 X 256,791
AXA FINANCIAL INC COMMON 002451102 107,269,838 2,990,100 X 2,990,100
32,087,497 894,425 X 894,425
ABBOTT LABS COMMON 002824100 47,196,114 1,341,275 X 1,341,275
ABERCROMBIE & FITCH CO COMMON 002896207 187,200 11,700 X 11,700
10,518,800 657,425 X 657,425
1,959,360 122,460 X 122,460
ABRAXAS PETROLEUM CORP COMMON 003830106 2,149,613 955,384 X 955,384
11,402 5,068 X 5,068
ABRAXAS PETROLEUM CONTINGENT RIGHCOMMON 003831112 2 X 2
1 X 1
ACKERLEY GROUP INC COMMON 004527107 15,722,438 1,039,500 X 1,039,500
ACTIVISION INC NEW COMMON 004930202 18,021,375 1,494,000 X 1,494,000
ACTIVISION INC. CONVERT 004930AA1 8,922,500 10,375,000 X 10,375,000
Total 1,176,406,363
3/31/2000 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
ACTIVE SOFTWARE INC COMMON 00504E100 5,705,761 89,700 X 89,700
107,500 1,690 X 1,690
ACTUATE SOFTWARE CORP COMMON 00508B102 15,045,975 279,600 X 279,600
4,270,614 79,361 X 79,361
ACXIOM CORP COMMON 005125109 9,103,850 273,800 X 273,800
ADAPTEC INC COMMON 00651F108 250,884,825 6,495,400 X 6,495,400
ADELPHIA COMMUNICATIONS CORP COMMON 006848105 254,800 5,200 X 5,200
118,458,970 2,417,530 X 2,417,530
2,094,015 42,735 X 42,735
ADVANCED FIBRE COMMUNICATIONS COMMON 00754A105 1,090,763 17,400 X 17,400
11,784,937 187,995 X 187,995
11,463,099 182,861 X 182,861
ADVANCED MICRO DEVICES INC COMMON 007903107 393,748,369 6,900,300 X 6,900,300
ADVENT SOFTWARE INC COMMON 007974108 35,783,785 780,028 X 780,028
14,072,477 306,757 X 306,757
AETHER SYSTEMS INC. COMMON 00808V105 14,592,600 80,400 X 80,400
492,228 2,712 X 2,712
381,150 2,100 X 2,100
AFFILIATED COMPUTER SERVICES COMMON 008190100 14,443,800 380,100 X 380,100
4,713,330 124,035 X 124,035
AFFILIATED MANAGERS GROUP COMMON 008252108 40,365,500 849,800 X 849,800
13,350,873 281,071 X 281,071
AFFYMETRIX INC COMMON 00826T108 10,049,219 67,700 X 67,700
3,205,063 21,592 X 21,592
AGILENT TECHNOLOGIES INC COMMON 00846U101 3,075,800 29,575 X 29,575
AIRGATE PCS INC COMMON 009367103 9,537,200 90,400 X 90,400
1,645,800 15,600 X 15,600
AKAMAI TECHNOLOGIES COMMON 00971T101 643 4 X 4
ELECTROLUX AB COMMON 010198208 100,762 2,630 X 2,630
489,519 12,777 X 12,777
INDIA IT FUND COMMON 0104388 1,883,240 20,470 X 20,470
ALAMOSA PCS HOLDINGS INC COMMON 011593100 9,554,525 253,100 X 253,100
Total 1,001,750,989
3/31/2000 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
1,638,350 43,400 X 43,400
ALLIED CAPITAL CORP COMMON 01903Q108 5,763,094 330,500 X 330,500
151,183 8,670 X 8,670
ALLIED ZURICH PLC COMMON 01959Q101 102,138 4,670 X 4,670
492,581 22,522 X 22,522
ALLSTATE CORP COMMON 020002101 77,211,793 3,242,490 X 3,242,490
20,583,430 864,396 X 864,396
ALLTEL CORP COMMON 020039103 60,195,025 951,700 X 951,700
ALPHA INDUSTRIES INC COMMON 020753109 16,463,500 173,300 X 173,300
4,525,420 47,636 X 47,636
ALPHARMA INC COMMON 020813101 31,880,625 867,500 X 867,500
5,886,358 160,173 X 160,173
ALTEON WEBSYSTEMS INC COMMON 02145A109 55,013,800 670,900 X 670,900
ALZA CORP DEL COMMON 022615108 47,460,219 1,263,500 X 1,263,500
1,293,277 34,430 X 34,430
1,119,363 29,800 X 29,800
AMERICA ONLINE INC DEL COMMON 02364J104 97,084,711 1,439,625 X 1,439,625
1,756,342 26,044 X 26,044
2,697,500 40,000 X 40,000
UNITED CUSTOMER MNGNT SOLUTIONS COMMON 0246718 205,100 5,860 X 5,860
AMERICAN CAPITAL STRATEGIES COMMON 024937104 2,276,138 89,700 X 89,700
AMERICAN GENERAL CORP COMMON 026351106 69,324,197 1,235,175 X 1,235,175
AMERICAN HOME PRODS CORP COMMON 026609107 163,677,673 3,045,166 X 3,045,166
16,985,538 316,010 X 316,010
AMERICAN INTL GROUP INC COMMON 026874107 131,019,898 1,196,529 X 1,196,529
1,099,298 10,039 X 10,039
1,021,088 9,325 X 9,325
AMERICAN NATIONAL CAN GROUP COMMON 027714104 7,218,619 549,990 X 549,990
540,619 41,190 X 41,190
AMERICAN PWR CONVERSION CORP COMMON 029066107 475,951,088 11,100,900 X 11,100,900
348,574 8,130 X 8,130
AMERICAN SOFTWARE- CL A COMMON 029683109 1,950,200 139,300 X 139,300
Total 1,302,936,735
3/31/2000 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
729,176 52,084 X 52,084
AMERICAN TOWER CORP -CL A COMMON 029912201 814,688 16,500 X 16,500
2,280,878 46,195 X 46,195
6,696,731 135,630 X 135,630
AMGEN INC COMMON 031162100 3,069 50 X 50
AMKOR TECHNOLOGIES INC COMMON 031652100 537,894,563 10,137,000 X 10,137,000
AMKOR TECH IND CONVERT 031652AF7 4,005,750 3,675,000 X 3,675,000
27,250 25,000 X 25,000
ANADARKO PETE CORP COMMON 032511107 11,606 300 X 300
ANADIGICS INC COMMON 032515108 53,615,100 812,350 X 812,350
16,570,950 251,075 X 251,075
ANHEUSER BUSCH COS INC COMMON 035229103 46,164,600 741,600 X 741,600
ANTENNA TV SA - SPON ADR COMMON 03672N100 825,138 35,300 X 35,300
ANSWERTHINK CONSULTING GROUP COMMON 036916104 8,875,700 363,200 X 363,200
2,545,825 104,177 X 104,177
APEX INC COMMON 037548104 116,914,050 3,149,200 X 3,149,200
7,736,033 208,378 X 208,378
APOGEE ENTERPRISES INC COMMON 037598109 2,126,734 535,870 X 535,870
88,186 22,220 X 22,220
APOLLO GROUP INC COMMON 037604105 324,156 11,500 X 11,500
1,000,938 35,510 X 35,510
2,660,759 94,395 X 94,395
APRIA HEALTHCARE GROUP INC COMMON 037933108 6,810,313 471,710 X 471,710
503,075 34,845 X 34,845
APPLIED EXTRUSION TECHNOLOGIES COMMON 038196101 5,717,536 698,325 X 698,325
170,791 20,860 X 20,860
APPLIED MATLS INC COMMON 038222105 317,881,688 3,372,750 X 3,372,750
APPLIED PWR INC COMMON 038225108 347,700 12,200 X 12,200
1,082,288 37,975 X 37,975
2,870,378 100,715 X 100,715
APPLIED MICRO CIRCUITS CORP COMMON 03822W109 33,043,763 220,200 X 220,200
4,661,842 31,066 X 31,066
Total 1,185,001,251
3/31/2000 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
APPNET SYSTEMS INC COMMON 03831Q101 49,006,900 1,042,700 X 1,042,700
ARIBA INC COMMON 04033V104 230,588 1,100 X 1,100
ARMSTRONG WORLD INDS INC COMMON 042476101 30,718,992 1,718,545 X 1,718,545
8,413,637 470,693 X 470,693
ARROW ELECTRS INC COMMON 042735100 91,762,800 2,603,200 X 2,603,200
ART TECHNOLOGY GROUP INC COMMON 04289L107 7,212,488 109,800 X 109,800
138,601 2,110 X 2,110
ARTESYN TECHNOLOGIES INC COMMON 043127109 13,356,619 705,300 X 705,300
ASAHI CHEM INDUS - UNSPON ADR COMMON 043389204 136,029 2,130 X 2,130
640,549 10,030 X 10,030
ASPECT DEV INC COMMON 045234101 59,212,125 919,800 X 919,800
17,014,956 264,310 X 264,310
ASPECT COMMUNICATIONS CORP. COMMON 04523Q102 548,525 14,800 X 14,800
40,606,602 1,095,625 X 1,095,625
4,496,237 121,315 X 121,315
ASPEN TECHNOLOGY INC COMMON 045327103 2,487,100 61,600 X 61,600
ASTRAZENECA PLC -SPONS ADR COMMON 046353108 X
X
ATLANTIC RICHFIELD CO COMMON 048825103 2,040,000 24,000 X 24,000
ATMEL CORP COMMON 049513104 53,710,650 1,040,400 X 1,040,400
AUTOBYTEL.COM INC COMMON 05275N106 5,459,716 664,300 X 664,300
AUTODESK INC COMMON 052769106 455,000 10,000 X 10,000
246,184,803 5,410,655 X 5,410,655
3,750,793 82,435 X 82,435
AVANT CORP COMMON 053487104 238,750 19,100 X 19,100
3,619,538 289,563 X 289,563
4,129,338 330,347 X 330,347
AVIS RENT A CAR INC COMMON 053790101 7,516,358 426,460 X 426,460
519,497 29,475 X 29,475
AVNET INC COMMON 053807103 65,545,200 1,040,400 X 1,040,400
AXA-UAP COMMON 054536107 145,526 2,030 X 2,030
Total 719,297,912
3/31/2000 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
744,618 10,387 X 10,387
BJS WHOLESALE CLUB INC COMMON 05548J106 468,175 12,200 X 12,200
8,277,871 215,710 X 215,710
3,762,285 98,040 X 98,040
BP AMOCO PLC - SPONS ADR COMMON 055622104 68,228,480 1,281,286 X 1,281,286
415,883 7,810 X 7,810
BMC SOFTWARE INC COMMON 055921100 149,119,906 3,020,150 X 3,020,150
798,147 16,165 X 16,165
1,313,375 26,600 X 26,600
BWAY CORP COMMON 056039100 5,273,831 691,650 X 691,650
192,417 25,235 X 25,235
BALLARD POWER SYSTEMS INC COMMON 05858H104 46,475 550 X 550
BANCO BILBAO VIZCAYA - SPON ADR COMMON 05946K101 133,310 8,962 X 8,962
656,910 44,162 X 44,162
BANCO DE A. EDWARDS-SP ADR COMMON 059504100 880,875 48,600 X 48,600
BANK OF AMERICA CORP COMMON 060505104 111,735,744 2,130,837 X 2,130,837
179,651 3,426 X 3,426
BANK OF NEW YORK CO INC. COMMON 064057102 234,365,534 5,638,870 X 5,638,870
32,159,192 773,755 X 773,755
BANK TOKYO-MITSUBISHI LTD COMMON 065379109 107,470 7,575 X 7,575
530,868 37,418 X 37,418
BANK UTD CORP COMMON 065412108 14,846,053 470,370 X 470,370
2,569,724 81,417 X 81,417
BARCLAYS PLC -SPONS ADR COMMON 06738E204 114,400 1,040 X 1,040
575,850 5,235 X 5,235
BARR LABS INC COMMON 068306109 25,733,400 612,700 X 612,700
8,618,274 205,197 X 205,197
BARRETT RES CORP COMMON 068480201 268,313 9,000 X 9,000
3,779,629 126,780 X 126,780
2,213,131 74,235 X 74,235
BAXTER INTL INC COMMON 071813109 142,703,831 2,276,432 X 2,276,432
27,788,428 443,285 X 443,285
BAY VIEW CAP CORP DEL COMMON 07262L101 3,587,213 478,295 X 478,295
Total 852,189,263
3/31/2000 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
196,988 26,265 X 26,265
BAYER A G COMMON 072730302 78,538 1,750 X 1,750
414,726 9,241 X 9,241
BAYERISCHE HYPO-UND VER-ADR COMMON 072735103 84,863 1,375 X 1,375
434,500 7,040 X 7,040
BERKLEY W R CORP COMMON 084423102 5,215,146 226,131 X 226,131
320,223 13,885 X 13,885
BESTFOODS COMMON 08658U101 104,896,280 2,240,775 X 2,240,775
BINDVIEW DEVELOPMENT CORP COMMON 090327107 316,838 10,200 X 10,200
23,187,069 746,465 X 746,465
6,198,056 199,535 X 199,535
BIOMET INC COMMON 090613100 341,925 9,400 X 9,400
4,324,806 118,895 X 118,895
2,873,989 79,010 X 79,010
BLUESTONE SOFTWARE RESTRICTED COMMON 096239991 4,779,051 166,590 X 166,590
BOEING CO COMMON 097023105 11,344 300 X 300
BRISTOL MYERS SQUIBB CO COMMON 110122108 63,307,290 1,091,505 X 1,091,505
572,750 9,875 X 9,875
551,000 9,500 X 9,500
BRITISH AWYS PLC COMMON 110419306 5,375 100 X 100
BRITISH AMERICAN TOBACCO COMMON 110448107 X
BROADCOM CORP-CL A COMMON 111320107 36,079,081 148,550 X 148,550
1,320,026 5,435 X 5,435
1,602,975 6,600 X 6,600
BROKEN HILL PROPRIETARY COMPANY LCOMMON 112169602 108,098 4,970 X 4,970
555,495 25,540 X 25,540
BROTHERS GOURMET COFFEES INC COMMON 114822109 14 3,531 X 3,531
BURR BROWN CORP COMMON 122574106 70,035,462 1,288,009 X 1,288,009
21,096,521 387,982 X 387,982
CBS CORP COMMON 12490K107 221,114,963 3,904,900 X 3,904,900
C-CUBE MICROSYSTEMS INC COMMON 125015107 246,259,156 3,382,100 X 3,382,100
CSG SYS INTL INC COMMON 126349109 497,888 10,200 X 10,200
Total 816,780,433
3/31/2000 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
220,241,756 4,511,995 X 4,511,995
17,655,579 361,702 X 361,702
CTS CORP COMMON 126501105 199,500 3,500 X 3,500
108,184,290 1,897,970 X 1,897,970
1,635,330 28,690 X 28,690
CVS CORP COMMON 126650100 69,954,522 1,862,350 X 1,862,350
CABLE & WIRELESS PLC-SP ADR COMMON 126830207 304,080 5,430 X 5,430
CABLEVISION SYS CORP COMMON 12686C109 108,402,300 1,784,400 X 1,784,400
CABOT OIL & GAS CORP COMMON 127097103 4,446,988 246,200 X 246,200
CADBURY SCHWEPPES PLC - SP ADR COMMON 127209302 117,331 4,135 X 4,135
589,916 20,790 X 20,790
CADENCE DESIGN SYSTEM INC COMMON 127387108 127,875 6,200 X 6,200
CADMUS COMMUNICATIONS CORP COMMON 127587103 6,136,929 691,485 X 691,485
315,240 35,520 X 35,520
CALIPER TECHNOLOGIES CORP COMMON 130876105 11,443,813 141,500 X 141,500
4,380,837 54,168 X 54,168
CALPINE CORP COMMON 131347106 4,117,200 43,800 X 43,800
79,430 845 X 845
CANAL PLUS - SPONSORED ADR COMMON 137041208 138,869 3,155 X 3,155
688,845 15,650 X 15,650
CANDESCENT TECHNOLOGY CORP CONVERT 137392AA4 2,295,000 3,000,000 X 3,000,000
CANON INC COMMON 138006309 185,653 4,305 X 4,305
933,958 21,657 X 21,657
CAPITAL ONE FINL CORP COMMON 14040H105 282,831 5,900 X 5,900
876,298 18,280 X 18,280
2,327,605 48,555 X 48,555
CAPITAL SR LIVING CORP COMMON 140475104 2,067,656 661,650 X 661,650
921,294 294,814 X 294,814
CAREER EDUCATION CORP COMMON 141665109 5,992,000 171,200 X 171,200
CAREMARK RX INC COMMON 141705103 192,625 46,000 X 46,000
542,386 129,525 X 129,525
1,577,410 376,695 X 376,695
Total 577,355,346
3/31/2000 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
CAREY INTERNATIONAL INC COMMON 141750109 14,723,700 866,100 X 866,100
4,055,826 238,578 X 238,578
CASH AMER INTL INC COMMON 14754D100 1,243,750 100,000 X 100,000
CENDANT CORP COMMON 151313103 16,669 901 X 901
CENTURYTEL INC COMMON 156700106 363,825 9,800 X 9,800
43,580,666 1,173,890 X 1,173,890
2,992,275 80,600 X 80,600
CERIDIAN CORP COMMON 15677T106 291,650 15,200 X 15,200
864,781 45,070 X 45,070
2,400,452 125,105 X 125,105
CHAMPION INTL CORP COMMON 158525105 101,275,376 1,901,885 X 1,901,885
32,333,134 607,195 X 607,195
CHARTER COMMUNICATIONS INC-A COMMON 16117M107 128,953 9,000 X 9,000
67,720,163 4,726,380 X 4,726,380
1,056,484 73,735 X 73,735
CHINA TELECOM* COMMON 169428109 196,748 1,110 X 1,110
1,043,116 5,885 X 5,885
CHIRON CORP COMMON 170040109 553,613 11,100 X 11,100
1,777,296 35,635 X 35,635
4,540,371 91,035 X 91,035
CHOICEPOINT INC COMMON 170388102 441,025 11,800 X 11,800
1,037,904 27,770 X 27,770
3,145,854 84,170 X 84,170
CHOICE ONE COMMUNCATIONS IN COMMON 17038P104 6,503,600 183,200 X 183,200
1,128,900 31,800 X 31,800
CHUBB CORP COMMON 171232101 127,574,891 1,888,250 X 1,888,250
CIENA CORP COMMON 171779101 19,719,644 156,350 X 156,350
385,943 3,060 X 3,060
CIRCUIT CITY STORE INC COMMON 172737108 19,598,706 321,950 X 321,950
383,817 6,305 X 6,305
CISCO SYS INC COMMON 17275R102 352,974,084 4,565,550 X 4,565,550
3,627,193 46,916 X 46,916
6,045,838 78,200 X 78,200
CINTAS CORP COMMON 172908105 21,922,467 559,425 X 559,425
Total 845,648,712
3/31/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 10
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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
312,364 7,971 X 7,971
CITIGROUP INC COMMON 172967101 260,348,445 4,348,200 X 4,348,200
40,569,893 677,577 X 677,577
1,284,319 21,450 X 21,450
CITRIX SYS INC COMMON 177376100 10,507,250 158,600 X 158,600
337,875 5,100 X 5,100
384,250 5,800 X 5,800
CLEAR CHANNEL COMMUNICATIONS COMMON 184502102 414,375 6,000 X 6,000
2,417 35 X 35
CLOROX CO DEL COMMON 189054109 24,390,234 739,098 X 739,098
COASTAL CORP COMMON 190441105 88,460,300 1,923,050 X 1,923,050
COCA COLA CO COMMON 191216100 87,199,314 1,857,775 X 1,857,775
2,146,687 45,735 X 45,735
3,172,975 67,600 X 67,600
COGNEX CORP COMMON 192422103 201,924,479 3,500,316 X 3,500,316
14,493,869 251,248 X 251,248
COLGATE PALMOLIVE CO COMMON 194162103 2,976,600 52,800 X 52,800
1,691 30 X 30
COMCAST CORP -CL A COMMON 200300101 5,123,250 124,200 X 124,200
300,506 7,285 X 7,285
618,750 15,000 X 15,000
COMCAST CORP COMMON 200300200 4,337,500 100,000 X 100,000
COMDISCO INC COMMON 200336105 322,113 7,300 X 7,300
133,206,756 3,018,850 X 3,018,850
2,633,159 59,675 X 59,675
COMMERCE BANCORP INC NJ COMMON 200519106 90 2 X 2
15 X
COMMERCIAL FEDERAL CORPORATION COMMON 201647104 5,813,430 349,680 X 349,680
342,392 20,595 X 20,595
BRASIL DISTR PAO ACU COMMON 20440T201 575,575 16,100 X 16,100
COMPLETE BUSINESS SOLUTIONS COMMON 20452F107 7,509,386 335,615 X 335,615
438,438 19,595 X 19,595
COMPUTER ASSOC INTL INC COMMON 204912109 174,011,250 2,940,000 X 2,940,000
Total 1,074,159,947
3/31/2000 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
844,014 14,260 X 14,260
1,237,019 20,900 X 20,900
COMPUWARE CORP COMMON 205638109 109,636,631 5,205,300 X 5,205,300
COMVERSE TECHNOLOGY INC COMMON 205862402 23,322,600 123,400 X 123,400
CONAGRA INC COMMON 205887102 63,024,268 3,477,201 X 3,477,201
21,298,416 1,175,085 X 1,175,085
COM21 INC COMMON 205937105 8,347,200 177,600 X 177,600
1,433,500 30,500 X 30,500
CONCORD EFS INC COMMON 206197105 14,680 640 X 640
COPART INC COMMON 217204106 5,607,000 320,400 X 320,400
COPPER MOUNTAIN NETWORKS INC COMMON 217510106 26,998,406 329,500 X 329,500
7,479,173 91,279 X 91,279
CORN PRODS INTL INC COMMON 219023108 2,406 100 X 100
CORNELL CORRECTIONS INC COMMON 219141108 4,182,000 393,600 X 393,600
1,862,637 175,307 X 175,307
CORNING INC COMMON 219350105 92,712,600 477,900 X 477,900
3,832,470 19,755 X 19,755
5,218,600 26,900 X 26,900
CORPORATE EXECUTIVE BOARD CO COMMON 21988R102 16,453,150 324,200 X 324,200
4,481,174 88,299 X 88,299
CORRECTIONAL PROPERTIES TRST COMMON 22025E104 9,003,350 782,900 X 782,900
4,119,910 358,253 X 358,253
COSTAR GROUP INC COMMON 22160N109 28,526,131 773,590 X 773,590
7,596,103 205,996 X 205,996
TURKIYE IS BANKASI - GDR 144A COMMON 2238274 571,520 132,000 X 132,000
COX RADIO INC COMMON 224051102 386,400 4,600 X 4,600
5,403,300 64,325 X 64,325
4,094,160 48,740 X 48,740
CREDENCE SYS CORP COMMON 225302108 278,715,812 2,227,499 X 2,227,499
18,494,476 147,808 X 147,808
CREO PRODUCTS INC COMMON 225606102 3,219,525 73,800 X 73,800
CROSS TIMBERS OIL CO COMMON 227573102 19,312,567 1,478,474 X 1,478,474
Total 777,431,198
3/31/2000 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
8,822,622 675,416 X 675,416
CROWN CASTLE INTL CORP COMMON 228227104 11,173,125 295,000 X 295,000
CROWN CORK & SEAL INC COMMON 228255105 47,996,720 2,999,795 X 2,999,795
14,020,480 876,280 X 876,280
CUBIC CORP COMMON 229669106 5,538,375 246,150 X 246,150
295,763 13,145 X 13,145
CUTTER & BUCK INC COMMON 232217109 6,821,278 507,630 X 507,630
418,699 31,159 X 31,159
CYLINK CORP COMMON 232565101 152,250 10,500 X 10,500
467,118 32,215 X 32,215
1,252,220 86,360 X 86,360
CYMER INC COMMON 232572107 1,103,500 22,070 X 22,070
CYPRESS SEMICONDUCTOR CORP COMMON 232806109 76,562,500 1,562,500 X 1,562,500
CYTYC CORP COMMON 232946103 15,623,350 323,800 X 323,800
4,138,161 85,765 X 85,765
DII GROUP INC COMMON 232949107 47,079,225 416,400 X 416,400
DQE INC COMMON 23329J104 1,593 35 X 35
128,083 2,815 X 2,815
DSP GROUP INC. COMMON 23332B106 1,016,400 15,400 X 15,400
DAIWA SECURITIES-UNSPONS ADR COMMON 234064202 238,037 1,265 X 1,265
1,126,209 5,985 X 5,985
DAL-TILE INTL INC COMMON 23426R108 6,010,593 757,240 X 757,240
345,440 43,520 X 43,520
DALLAS SEMICONDUCTOR CORP COMMON 235204104 117,584,750 3,221,500 X 3,221,500
DELL COMPUTER CORP COMMON 247025109 156,200,303 2,895,950 X 2,895,950
2,579,022 47,815 X 47,815
3,867,319 71,700 X 71,700
DELPHI AUTOMOTIVE SYSTEMS COMMON 247126105 X
DELTA AIR LINES INC DEL COMMON 247361108 3,408 64 X 64
DEVRY INC DEL COMMON 251893103 40,970,650 1,343,300 X 1,343,300
12,539,191 411,121 X 411,121
Total 584,076,381
3/31/2000 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
DIAL CORP NEW COMMON 25247D101 53,894,363 3,919,590 X 3,919,590
15,718,271 1,143,147 X 1,143,147
DIGITAL MICROWAVE CORP COMMON 253859102 7,510,088 221,700 X 221,700
2,073,997 61,225 X 61,225
DIGITALTHINK INC COMMON 25388M100 14,070,331 357,200 X 357,200
4,280,422 108,666 X 108,666
DISNEY WALT CO COMMON 254687106 29,669,063 719,250 X 719,250
1,429,849 34,663 X 34,663
1,980,000 48,000 X 48,000
DOBSON COMMUNICATIONS CORPORATIONCOMMON 256069105 494,500 21,500 X 21,500
23,517,500 1,022,500 X 1,022,500
8,360,155 363,485 X 363,485
DOBSON COMMUNICATIONS CONVERT 256072505 9,597,438 9,054 X 9,054
57,114 54 X 54
DOCUMENTUM INC COMMON 256159104 21,348,600 273,700 X 273,700
2,664,636 34,162 X 34,162
DOLE FOOD INC COMMON 256605106 64,871,101 3,337,420 X 3,337,420
16,960,579 872,570 X 872,570
DOUBLECLICK INC. COMMON 258609304 11,490,503 122,729 X 122,729
4,124,181 44,050 X 44,050
DOW CHEM CO COMMON 260543103 72,908,700 639,550 X 639,550
23,066,190 202,335 X 202,335
DREAMLIFE INC COMMON 26152Q103 987,500 100,000 X 100,000
DU PONT E I DE NEMOURS & CO COMMON 263534109 42,191,188 797,000 X 797,000
103,228 1,950 X 1,950
DURA PHARMACEUTICALS INC COMMON 26632S109 12,482,413 1,013,800 X 1,013,800
3,688,517 299,575 X 299,575
DYNEGY INC COMMON 26816Q101 6,753,776 107,650 X 107,650
139,906 2,230 X 2,230
E M C CORP MASS COMMON 268648102 8,687,700 68,950 X 68,950
401,310 3,185 X 3,185
617,400 4,900 X 4,900
ENSCO INTL INC COMMON 26874Q100 596,063 16,500 X 16,500
Total 466,736,580
3/31/2000 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
1,840,208 50,940 X 50,940
4,892,589 135,435 X 135,435
EOG RESOURCES INC COMMON 26875P101 213,994 10,100 X 10,100
606,386 28,620 X 28,620
1,763,965 83,255 X 83,255
ECHOSTAR COMMUNICATIONS NEW COMMON 278762109 133,067,600 1,684,400 X 1,684,400
EL PASO NAT GAS CO COMMON 283905107 90,041,095 2,230,120 X 2,230,120
23,263,873 576,195 X 576,195
ELAN PLC COMMON 284131208 34,029,475 716,410 X 716,410
1,743,013 36,695 X 36,695
593,750 12,500 X 12,500
ELECTRO SCIENTIFIC INDS COMMON 285229100 176,540,400 3,043,800 X 3,043,800
ELECTRONIC DATA SYS NEW COMMON 285661104 101,719,536 1,584,725 X 1,584,725
ELECTRONICS FOR IMAGING INC COMMON 286082102 397,392,000 6,623,200 X 6,623,200
EMBRATEL PARTICIPACOES COMMON 29081N100 787,969 30,750 X 30,750
EMUSIC.COM INC COMMON 292476108 4,753,944 753,100 X 753,100
EMUSIC.COM-RESTRICTED COMMON 292476991 6,312,500 1,000,000 X 1,000,000
ENGAGE TECHNOLOGIES INC COMMON 292827102 33,951,431 444,900 X 444,900
10,704,507 140,272 X 140,272
ENRON CORP COMMON 293561106 43,000,713 574,300 X 574,300
2,182,981 29,155 X 29,155
3,092,338 41,300 X 41,300
ENTRUST TECHNOLOGIES INC COMMON 293848107 45,720,984 537,400 X 537,400
EPRISE CORP COMMON 294352109 505,575 32,100 X 32,100
20,475 1,300 X 1,300
EQUITABLE RES INC COMMON 294549100 8,275,300 184,665 X 184,665
566,430 12,640 X 12,640
ERICSSON L M TEL CO COMMON 294821400 36,656,296 390,740 X 390,740
1,838,350 19,596 X 19,596
1,238,325 13,200 X 13,200
ESPEED INC- CL A COMMON 296643109 2,686,838 51,300 X 51,300
455,663 8,700 X 8,700
Total 1,170,458,501
3/31/2000 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
ETINUUM INC COMMON 297664104 1,444,000 152,000 X 152,000
171,950 18,100 X 18,100
E-STAMP RESTRICTED COMMON 297999997 901,314 152,765 X 152,765
EUROPE FUNDUSZ LEASINGOW COMMON 298793100 577,500 30,000 X 30,000
EXAR CORP COMMON 300645108 33,237,203 464,450 X 464,450
8,951,538 125,087 X 125,087
EXCALIBUR TECHNOLGIES CORP COMMON 300651205 4,556,875 115,000 X 115,000
EXCHANGE APPLICATIONS INC COMMON 300867108 6,181,275 116,800 X 116,800
1,058,438 20,000 X 20,000
EXODUS COMMUNICATIONS INC COMMON 302088109 27,257,000 194,000 X 194,000
741,840 5,280 X 5,280
1,039,700 7,400 X 7,400
EXPEDITORS INTL WASH INC COMMON 302130109 12,044,250 303,000 X 303,000
3,756,892 94,513 X 94,513
EXXON MOBIL CORP COMMON 30231G102 107,692,011 1,381,774 X 1,381,774
141,535 1,816 X 1,816
FAIRCHILD SEMICON INTL - CL A COMMON 303726103 83,625,150 2,291,100 X 2,291,100
FAIRMARKET INC COMMON 305158107 2,042,950 89,800 X 89,800
522,135 22,951 X 22,951
FAMILY DLR STORES INC COMMON 307000109 289,294 13,900 X 13,900
785,464 37,740 X 37,740
2,373,874 114,060 X 114,060
FARGO ELECTRONICS COMMON 30744P102 4,371,450 362,400 X 362,400
FASTENAL CO COMMON 311900104 8,856,875 185,000 X 185,000
176,898 3,695 X 3,695
FEDERAL NATL MTG ASSN COMMON 313586109 139,650,154 2,468,953 X 2,468,953
22,166,674 391,897 X 391,897
FIRST DATA CORP COMMON 319963104 96,932,750 2,184,400 X 2,184,400
FIRSTSERVICE CORP COMMON 33761N109 5,032,456 456,200 X 456,200
FISERV INC COMMON 337738108 422,078 11,350 X 11,350
5,992,691 161,148 X 161,148
Total 582,994,214
3/31/2000 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
3,600,866 96,830 X 96,830
FORD MTR CO DEL COMMON 345370100 128,318,138 2,793,320 X 2,793,320
23,471,628 510,947 X 510,947
FOREST LABS INC COMMON 345838106 464,750 5,500 X 5,500
24,442,893 289,265 X 289,265
4,219,085 49,930 X 49,930
FORMULA SYSTEMS (1985) -ADR COMMON 346414105 30,500 500 X 500
FORRESTER RESH INC COMMON 346563109 29,837,500 550,000 X 550,000
8,359,383 154,090 X 154,090
FORTIS (NL) - SPONS ADR COMMON 34956J101 101,495 3,965 X 3,965
509,419 19,901 X 19,901
FORWARD AIR CORPORATION COMMON 349853101 1,739,847 73,450 X 73,450
FOUNDRY NETWORKS INC COMMON 35063R100 8,366,250 58,200 X 58,200
152,375 1,060 X 1,060
FOX ENTERTAINMENT GRP INC-A COMMON 35138T107 29,937,500 1,000,000 X 1,000,000
FREDS INC COMMON 356108100 8,503,736 557,622 X 557,622
601,918 39,470 X 39,470
FREEPORT-MCMORAN COPPER & GOLD COMMON 35671D857 96,500 8,000 X 8,000
295,169 24,470 X 24,470
749,262 62,115 X 62,115
FRIEDMAN BILLINGS RAMSEY - A COMMON 358433100 3,035,213 279,100 X 279,100
502,425 46,200 X 46,200
FUJITSU LTD - UNSPON ADR COMMON 359590304 91,370 595 X 595
471,437 3,070 X 3,070
FRONTLINE CAPITAL UNITS COMMON 359999992 24,995,250 26,450 X 26,450
FURNITURE BRANDS INTL INC COMMON 360921100 7,113,288 378,115 X 378,115
422,999 22,485 X 22,485
GKN PUB LTD COMMON 361755200 85,648 6,985 X 6,985
435,843 35,545 X 35,545
GTE CORP COMMON 362320103 84,667,855 1,192,505 X 1,192,505
169,690 2,390 X 2,390
GALILEO INTERNATIONAL INC COMMON 363547100 243,031 10,100 X 10,100
Total 396,032,260
3/31/2000 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
75,797,116 3,150,010 X 3,150,010
1,993,698 82,855 X 82,855
GARTNER GROUP INC COMMON 366651107 236,250 15,000 X 15,000
25,065,653 1,591,470 X 1,591,470
1,941,739 123,285 X 123,285
GENERAL ELEC CO COMMON 369604103 227,605,453 1,462,525 X 1,462,525
1,575,859 10,126 X 10,126
2,777,906 17,850 X 17,850
GENERAL MTRS CORP COMMON 370442105 97,045,070 1,171,865 X 1,171,865
25,940,436 313,243 X 313,243
GENERAL MOTORS CORP COMMON 370442832 37,350 300 X 300
GENERAL SEMICONDUCTOR INC COMMON 370787103 265,650 15,400 X 15,400
47,728,335 2,766,860 X 2,766,860
16,232,819 941,033 X 941,033
GENTEX CORP COMMON 371901109 15,125,206 408,100 X 408,100
299,836 8,090 X 8,090
GENUINE PARTS CO COMMON 372460105 16,713 700 X 700
GEORGIA PAC CORP COMMON 373298108 99,501,666 2,515,050 X 2,515,050
33,406,061 844,387 X 844,387
GEOGRAPHIC NETWORKS AFFILIATES INCOMMON 373999994 1,000,000 10,000 X 10,000
GILLETTE CO COMMON 375766102 95,143,978 2,524,550 X 2,524,550
GLOBAL CROSSING CP CONVERT 37932J301 21,189,600 87,200 X 87,200
151,875 625 X 625
GLOBAL TELESYSTEMS GROUP-ADR COMMON 37936U104 9,766,200 476,400 X 476,400
GOODRICH B F CO COMMON 382388106 78,291,056 2,729,100 X 2,729,100
20,093,930 700,442 X 700,442
GOTO.COM INC COMMON 38348T107 12,682,974 308,870 X 308,870
3,524,600 85,835 X 85,835
GROUPE DANONE - SPONS ADR COMMON 399449107 117,263 2,650 X 2,650
GRUPO CARSO - SPONSORED ADR COMMON 400485207 1,319,238 171,000 X 171,000
GUIDANT CORP COMMON 401698105 36,007,950 611,600 X 611,600
1,543,997 26,225 X 26,225
Total 953,425,476
3/31/2000 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
1,442,438 24,500 X 24,500
HNC SOFTWARE INC COMMON 40425P107 63,270,875 878,000 X 878,000
4,215,296 58,495 X 58,495
HACI OMER SABANCI HLDG ADR COMMON 40450N209 306,418 67,160 X 67,160
HADCO CORP COMMON 404681108 158,684,250 2,446,000 X 2,446,000
14,787,802 227,943 X 227,943
HANOVER COMPRESSOR CO COMMON 410768105 341,250 6,000 X 6,000
1,077,213 18,940 X 18,940
2,830,669 49,770 X 49,770
HARLEY DAVIDSON INC COMMON 412822108 635,000 8,000 X 8,000
26,491,803 333,755 X 333,755
5,588,318 70,404 X 70,404
1,174,750 14,800 X 14,800
HARMAN INTL INDS INC COMMON 413086109 7,765,500 129,425 X 129,425
452,400 7,540 X 7,540
HARMONIC INC. COMMON 413160102 8,524,800 102,400 X 102,400
2,529,551 30,385 X 30,385
HARRAHS ENTMT INC COMMON 413619107 196,763 10,600 X 10,600
507,870 27,360 X 27,360
1,948,970 104,995 X 104,995
HARRIS CORP DEL COMMON 413875105 235,025 6,800 X 6,800
72,685,110 2,103,005 X 2,103,005
1,978,358 57,240 X 57,240
HARRIS INTERACTIVE INC COMMON 414549105 6,086,600 936,400 X 936,400
1,658,826 255,204 X 255,204
HARTFORD FINL SVCS GROUP INC COMMON 416515104 12,116,675 229,700 X 229,700
HASBRO INC COMMON 418056107 10,013 600 X 600
HEALTH MGMT ASSOC INC NEW COMMON 421933102 394,725 27,700 X 27,700
1,182,536 82,985 X 82,985
3,234,893 227,010 X 227,010
HEWLETT PACKARD CO COMMON 428236103 53,150 400 X 400
HOME DEPOT INC COMMON 437076102 64,119,450 994,100 X 994,100
902,807 13,997 X 13,997
1,364,175 21,150 X 21,150
Total 468,794,275
3/31/2000 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
HONEYWELL INTL COMMON 438516106 79,877,411 1,516,060 X 1,516,060
22,981,761 436,190 X 436,190
HOOPER HOLMES INC COMMON 439104100 15,701,400 457,600 X 457,600
4,110,638 119,800 X 119,800
HOTJOBS.COM LTD COMMON 441474103 6,491,775 257,100 X 257,100
HOUSEHOLD INTL INC COMMON 441815107 4,440,188 119,000 X 119,000
HUMANA INC COMMON 444859102 61,581,305 8,421,375 X 8,421,375
17,103,718 2,338,970 X 2,338,970
HYPERION SOLUTIONS CORP COMMON 44914M104 9,366,500 288,200 X 288,200
I-CABLE COMMUNICATIONS-ADR COMMON 44934B104 91,500 6,000 X 6,000
IDEC PHARMACEUTICALS CORP COMMON 449370105 393,000 4,000 X 4,000
1,308,199 13,315 X 13,315
3,214,740 32,720 X 32,720
IMS HEALTH INC COMMON 449934108 142,275 8,400 X 8,400
2,407,835 142,160 X 142,160
1,241,011 73,270 X 73,270
ISS GROUP INC COMMON 450306105 96,392,100 827,400 X 827,400
18,211,863 156,325 X 156,325
ITC DELTACOM INC COMMON 45031T104 6,305,625 177,000 X 177,000
1,086,563 30,500 X 30,500
ITT EDUCATIONAL SERVICES INC COMMON 45068B109 18,521,600 1,157,600 X 1,157,600
5,530,272 345,642 X 345,642
IXL ENTERPRISES INC COMMON 450718101 37,903,600 1,353,700 X 1,353,700
ILLINOIS TOOL WKS INC COMMON 452308109 2,210,000 40,000 X 40,000
ILLUMINET HOLDINGS INC COMMON 452334105 14,228,734 289,000 X 289,000
3,853,870 78,276 X 78,276
IMAX CORP COMMON 45245E109 6,897,844 319,900 X 319,900
INDEPENDENT ENERGY HOLDINGS -ADR COMMON 45384X108 10,541,138 234,900 X 234,900
5,829,263 129,900 X 129,900
INMC MTG HLDGS INC COMMON 456607100 6,893,283 461,475 X 461,475
483,676 32,380 X 32,380
Total 465,342,683
3/31/2000 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
INFINITY BROADCASTING CORP-A COMMON 45662S102 101,533,666 3,136,175 X 3,136,175
INET TECHNOLOGIES COMMON 45662V105 16,553,556 312,700 X 312,700
5,005,664 94,558 X 94,558
INFONET SERVICES CORPORATION COMMON 45666T106 1,228,538 54,300 X 54,300
INFORMATION ARCHITECTS CORP COMMON 45669R107 781,875 45,000 X 45,000
INFORMATION HOLDINGS INC COMMON 456727106 17,754,188 567,000 X 567,000
7,941,539 253,622 X 253,622
INFOUSA INC. COMMON 456818301 8,764,563 960,500 X 960,500
3,428,053 375,677 X 375,677
ING GROEP N V COMMON 456837103 85,360 1,552 X 1,552
427,845 7,779 X 7,779
INSIGNIA FINANCIAL GROUP INC COMMON 45767A105 11,947,474 853,391 X 853,391
4,780,776 341,484 X 341,484
INSIGHT COMMUNICATIONS INC COMMON 45768V108 11,432,438 554,300 X 554,300
3,102,330 150,416 X 150,416
INTEGRATED DEVICE TECHNOLOGY COMMON 458118106 166,040,638 4,190,300 X 4,190,300
INTEL CORP COMMON 458140100 584,789,880 4,432,325 X 4,432,325
4,280,053 32,440 X 32,440
6,412,163 48,600 X 48,600
INTERIM SVCS INC COMMON 45868P100 371,250 20,000 X 20,000
1,122,846 60,490 X 60,490
3,036,268 163,570 X 163,570
INTERMEDIA COMMUNICATIONS INC COMMON 458801107 85,131,456 1,762,100 X 1,762,100
INTERMUNE PHARMACEUTICALS COMMON 45885B100 2,436,363 122,200 X 122,200
402,738 20,200 X 20,200
INTERNATIONAL BUSINESS MACHS COMMON 459200101 75,015,550 635,725 X 635,725
461,970 3,915 X 3,915
991,200 8,400 X 8,400
INTL PAPER CO COMMON 460146103 8,550 200 X 200
INTERNATIONAL RECTIFIER CORP COMMON 460254105 65,925,750 1,729,200 X 1,729,200
INTERPUBLIC GROUP COS INC COMMON 460690100 4,725,000 100,000 X 100,000
Total 1,195,919,535
3/31/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 21
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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
INTERSIL HOLDING CORP COMMON 46069S109 661,600 12,800 X 12,800
10,338 200 X 200
INTERWOVEN INC COMMON 46114T102 2,744 25 X 25
INTERWOVEN INC-RESTRICTE COMMON 46114T999 41,368,375 471,166 X 471,166
INTRAWARE INC COMMON 46118M103 11,571,631 280,100 X 280,100
3,291,284 79,668 X 79,668
INTUIT COMMON 461202103 82,878,375 1,524,200 X 1,524,200
INVENSYS PLC -SPON ADR COMMON 461204109 87,708 9,835 X 9,835
428,999 48,105 X 48,105
JDS UNIPHASE CORP COMMON 46612J101 38,804,246 321,860 X 321,860
1,331,854 11,047 X 11,047
1,350,300 11,200 X 11,200
JDA SOFTWARE GROUP INC COMMON 46612K108 21,431,475 1,465,400 X 1,465,400
3,926,125 268,453 X 268,453
JACK IN THE BOX INC COMMON 466367109 7,035,576 330,115 X 330,115
510,861 23,970 X 23,970
JOHNSON & JOHNSON COMMON 478160104 98,083,050 1,396,200 X 1,396,200
1,559,199 22,195 X 22,195
2,276,100 32,400 X 32,400
KLA-TENCORP CORP COMMON 482480100 589,750 7,000 X 7,000
107,288,163 1,273,450 X 1,273,450
4,840,163 57,450 X 57,450
KOZMO.COM, INC. COMMON 48299E959 10,574,200 1,400,000 X 1,400,000
KEANE INC COMMON 486665102 11,337,250 449,000 X 449,000
3,197,887 126,649 X 126,649
KEMET CORP COMMON 488360108 46,710,125 738,500 X 738,500
20,748,593 328,041 X 328,041
KENNAMETAL INC COMMON 489170100 18,038 600 X 600
KENT ELECTRS CORP COMMON 490553104 704,207 24,127 X 24,127
KEYNOTE SYSTEMS INC COMMON 493308100 12,566,525 122,900 X 122,900
2,137,025 20,900 X 20,900
KIMBERLY CLARK CORP COMMON 494368103 94,717,818 1,689,504 X 1,689,504
Total 632,039,582
3/31/2000 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
24,454,631 436,203 X 436,203
KINDER MORGAN INC COMMON 49455P101 12,740,850 369,300 X 369,300
240,465 6,970 X 6,970
KONIKKLIFKE PHILIPS ELECTRS NV SCOMMON 500472204 13,865,074 80,934 X 80,934
1,140,667 6,658 X 6,658
KOREA TELECOM CORP - COMMON 50063P103 686,542 15,670 X 15,670
LAM RESH CORP COMMON 512807108 46,905,556 1,040,900 X 1,040,900
LAMSON & SESSIONS CO COMMON 513696104 4,959,697 666,850 X 666,850
399,059 53,655 X 53,655
LANDSTAR SYS INC COMMON 515098101 3,608,025 65,900 X 65,900
1,406,966 25,698 X 25,698
LATTICE SEMICONDUCTOR CORP COMMON 518415104 429,754,706 6,349,100 X 6,349,100
7,707,576 113,870 X 113,870
LAUDER ESTEE COS INC COMMON 518439104 X
LEAP WIRELESS INTERNATIONAL INC COMMON 521863100 29,606,250 300,000 X 300,000
LEARNING TREE INTL INC COMMON 522015106 24,676,050 695,100 X 695,100
6,894,207 194,203 X 194,203
LEVEL 3 COMMUNICATIONS CONVERT 52729NAS9 1,943,700 1,980,000 X 1,980,000
19,633 20,000 X 20,000
LEXMARK INTL GROUP INC COMMON 529771107 100,758,600 952,800 X 952,800
LIBERTY FINL COS INC COMMON 530512102 5,718,581 288,635 X 288,635
329,680 16,640 X 16,640
LIFEMINDERS.COM ,INC COMMON 53219H108 4,072,500 60,000 X 60,000
LILLY ELI & CO COMMON 532457108 23,274,581 371,650 X 371,650
1,131,947 18,075 X 18,075
1,659,563 26,500 X 26,500
LINCARE HLDGS INC COMMON 532791100 255,375 9,000 X 9,000
819,186 28,870 X 28,870
2,103,297 74,125 X 74,125
LINCOLN NATL CORP IND COMMON 534187109 11,390,000 340,000 X 340,000
LINEAR TECHNOLOGY CORP COMMON 535678106 511,500 9,300 X 9,300
Total 763,034,464
3/31/2000 FORM 13F J. & W. SELIGMAN & CO. INCORPORATED Page 23
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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
94,310,150 1,714,730 X 1,714,730
4,327,950 78,690 X 78,690
LIZ CLAIBORNE INC COMMON 539320101 13,744 300 X 300
LOEHMANNS INC NEW COMMON 540417102 167,928 1,161,880 X 1,161,880
8,725 60,365 X 60,365
LUCENT TECHNOLOGIES INC COMMON 549463107 141,222,594 2,305,675 X 2,305,675
758,459 12,383 X 12,383
1,139,250 18,600 X 18,600
MBNA CORP COMMON 55262L100 5,438,181 213,262 X 213,262
MCI WORLDCOM INC COMMON 55268B106 127,944,375 2,823,600 X 2,823,600
MGC COMMUNICCATIONS INC COMMON 552763302 8,787,350 122,900 X 122,900
2,418,774 33,829 X 33,829
MSC INDL DIRECT INC COMMON 553530106 4,725,000 262,500 X 262,500
1,668,114 92,673 X 92,673
MACROMEDIA INC COMMON 556100105 86,049,750 952,800 X 952,800
MACRONIX INTL CO LTD-SP ADR COMMON 556103109 870,000 30,000 X 30,000
MATAV RT- MAGYAR TAVKOZLESI COMMON 559776109 1,067,653 23,925 X 23,925
561,249 12,577 X 12,577
MANNESMANN A G COMMON 563775303 380,321 1,190 X 1,190
703,115 2,200 X 2,200
MANUGISTICS GROUP INC COMMON 565011103 1,076,100 21,100 X 21,100
16,268,490 318,990 X 318,990
8,817,900 172,900 X 172,900
MARCHFIRST INC COMMON 566244109 114,321,338 3,203,400 X 3,203,400
MARINE DRILLING COS INC COMMON 568240204 7,349,546 267,865 X 267,865
392,768 14,315 X 14,315
MATTSON TECHNOLOGY INC COMMON 577223100 17,527,400 411,200 X 411,200
MAXIM INTEGRATED PRODS INC COMMON 57772K101 824,325 11,600 X 11,600
49,016,425 689,765 X 689,765
6,961,283 97,960 X 97,960
MAXYGEN COMMON 577776107 10,795,050 165,600 X 165,600
3,563,801 54,670 X 54,670
Total 719,477,105
3/31/2000 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
MAY DEPT STORES CO COMMON 577778103 42,227,738 1,481,675 X 1,481,675
MEAD CORP COMMON 582834107 46,830,749 1,340,415 X 1,340,415
115,993 3,320 X 3,320
MEDIAONE GROUP INC COMMON 58440J104 190,277,100 2,349,100 X 2,349,100
MEDIAPLEX INC COMMON 58446B105 3,182,400 61,200 X 61,200
MEDICIS PHARMACEUTICAL CORP COMMON 584690309 332,000 8,300 X 8,300
1,020,600 25,515 X 25,515
2,716,600 67,915 X 67,915
MEDTRONIC INC COMMON 585055106 176,278,576 3,427,044 X 3,427,044
35,612,084 692,337 X 692,337
2,386,700 46,400 X 46,400
MELLON FINANCIAL COMMON 58551A108 55,366,238 1,861,050 X 1,861,050
MEMBERWORKS INC COMMON 586002107 60,622,856 1,510,850 X 1,510,850
19,855,455 494,840 X 494,840
MERCK & CO INC COMMON 589331107 89,551,634 1,441,475 X 1,441,475
1,405,143 22,618 X 22,618
1,876,175 30,200 X 30,200
MERRILL LYNCH & CO INC COMMON 590188108 74,494,875 709,475 X 709,475
METRIS COS INC COMMON 591598107 36,468,638 938,100 X 938,100
10,360,887 266,518 X 266,518
METRO GOLDWYN MAYER INC COMMON 591610100 178,063 7,000 X 7,000
551,994 21,700 X 21,700
1,456,806 57,270 X 57,270
MICROSOFT CORP COMMON 594918104 878,875,031 8,271,765 X 8,271,765
4,025,494 37,887 X 37,887
6,534,375 61,500 X 61,500
MICROCHIP TECHNOLOGY INC COMMON 595017104 670,650 10,200 X 10,200
351,815,758 5,350,810 X 5,350,810
15,319,060 232,990 X 232,990
MICRON TECHNOLOGY INC COMMON 595112103 67,410,000 535,000 X 535,000
3,148,110 24,985 X 24,985
4,914,000 39,000 X 39,000
MIDCOAST ENERGY RESOURCES COMMON 59563W104 7,377,365 435,564 X 435,564
Total 2,193,259,145
3/31/2000 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
342,900 20,245 X 20,245
MICROCOSM TECHNOLOGIES INC. COMMON 595999939 7,500,001 1,173,709 X 1,173,709
UTI INDIA IT FUND COMMON 6019293 110,722 1,049 X 1,049
MOBIUS MANAGEMENT SOLUTIONS COMMON 606925105 5,187,075 427,800 X 427,800
MODIS PROFESSIONAL SERVICES INC COMMON 607830106 70,499,138 5,696,900 X 5,696,900
9,019,049 728,812 X 728,812
MOLEX INC COMMON 608554101 10,082,969 171,625 X 171,625
209,561 3,567 X 3,567
MORGAN J P & CO INC COMMON 616880100 49,198,744 373,425 X 373,425
MOTOROLA INC COMMON 620076109 39,106,100 267,850 X 267,850
1,881,940 12,890 X 12,890
2,832,400 19,400 X 19,400
MUELLER INDS INC COMMON 624756102 6,551,736 215,695 X 215,695
374,220 12,320 X 12,320
MYLAN LABS INC COMMON 628530107 5,531,625 201,150 X 201,150
107,525 3,910 X 3,910
NCO GROUP INC COMMON 628858102 258,694 8,100 X 8,100
629,169 19,700 X 19,700
2,168,556 67,900 X 67,900
NCR CORP NEW COMMON 62886E108 6,949,650 173,200 X 173,200
135,823 3,385 X 3,385
NFO WORLDWIDE INC COMMON 62910N108 8,821,676 378,600 X 378,600
4,183,585 179,547 X 179,547
NTL INC COMMON 629407107 14,471,325 155,920 X 155,920
CONVERT 629407AN7 41,100,000 40,000,000 X 40,000,000
NTT MOBILE COMM NTWK-SP ADR COMMON 629424508 288,354 1,405 X 1,405
1,498,211 7,300 X 7,300
NABISCO GROUP HOLDINGS COMMON 62952P102 7,238 600 X 600
ELEC & ELTEK INT CO LTD COMMON 6298188 113,850 45,000 X 45,000
NATIONAL BANK OF GREECE-ADR COMMON 633643408 662,475 48,400 X 48,400
NATIONAL INSTRS CORP COMMON 636518102 542,128 11,550 X 11,550
Total 290,366,436
3/31/2000 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
6,170,169 131,455 X 131,455
4,286,098 91,315 X 91,315
NATIONAL SEMICONDUCTOR CORP COMMON 637640103 126,256,725 2,078,300 X 2,078,300
NAVIGANT CONSULTING CO COMMON 63935N107 46,383,645 4,216,695 X 4,216,695
1,925 175 X 175
NEOFORMA.COM INC COMMON 640475109 3,054,429 186,530 X 186,530
1,207,493 73,740 X 73,740
NESTLE S A COMMON 641069406 126,355 1,410 X 1,410
594,584 6,635 X 6,635
NET.GENESIS CORP COMMON 64107E107 4,475,000 100,000 X 100,000
NETRO CORPORATION COMMON 64114R109 3,166,261 48,700 X 48,700
NETIQ CORP COMMON 64115P102 6,480,813 97,000 X 97,000
NETSCOUT SYSTEMS INC COMMON 64115T104 6,907,700 412,400 X 412,400
2,023,249 120,791 X 120,791
NETWORK APPLIANCE INC COMMON 64120L104 23,509,275 284,100 X 284,100
890,638 10,763 X 10,763
1,117,125 13,500 X 13,500
NETWORK ACCESS SOLUTIONS CORPORATCOMMON 64120S109 16,093,000 731,500 X 731,500
4,537,478 206,249 X 206,249
NET2000 COMMUNICATIONS INC COMMON 64122G103 8,799,375 370,500 X 370,500
2,532,011 106,611 X 106,611
NEW ERA OF NETWORKS INC COMMON 644312100 11,194,100 285,200 X 285,200
NEWELL RUBBERMAID INC COMMON 651229106 1,985 80 X 80
NEWFIELD EXPL CO COMMON 651290108 243,225 6,900 X 6,900
717,161 20,345 X 20,345
1,989,510 56,440 X 56,440
NEXTEL COMMUNICATIONS INC COMMON 65332V103 197,943,400 1,335,200 X 1,335,200
NICE SYSTEMS LTD-SPONS ADR COMMON 653656108 1,125,750 15,800 X 15,800
NIPPON TELEG & TEL CORP COMMON 654624105 246,683 3,130 X 3,130
1,261,394 16,005 X 16,005
NOKIA CORP-SPONSORED ADR A COMMON 654902204 40,126,500 180,750 X 180,750
Total 523,463,056
3/31/2000 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
1,799,310 8,105 X 8,105
3,108,000 14,000 X 14,000
NORFOLK SOUTHERN CORP COMMON 655844108 5,700 400 X 400
NORTEL NETWORKS CORPORATION COMMON 656569100 68,047,592 539,525 X 539,525
NOVA CORP GA COMMON 669784100 474,738 16,300 X 16,300
61,966,234 2,127,596 X 2,127,596
21,147,197 726,084 X 726,084
NOVARTIS A G COMMON 66987V109 71,460 1,045 X 1,045
359,899 5,263 X 5,263
NU HORIZONS ELEC CORP COMMON 669908105 8,294,663 374,900 X 374,900
NOVELLUS SYS INC COMMON 670008101 435,356,013 7,756,900 X 7,756,900
NUCOR CORP COMMON 670346105 6,240,000 124,800 X 124,800
124,250 2,485 X 2,485
NYFIX INC COMMON 670712108 11,946,935 237,160 X 237,160
3,349,686 66,495 X 66,495
OM GROUP INC COMMON 670872100 5,760,300 126,600 X 126,600
OTG SOFTWARE INC COMMON 671059103 2,467,125 61,200 X 61,200
828,261 20,546 X 20,546
OLYMPIC STEEL INC COMMON 68162K106 3,389,800 847,450 X 847,450
146,260 36,565 X 36,565
OMNICARE INC COMMON 681904108 217,125 18,000 X 18,000
28,526,305 2,364,875 X 2,364,875
8,822,814 731,425 X 731,425
ONYX SOFTWARE CORP COMMON 683402101 10,200,000 320,000 X 320,000
2,706,984 84,925 X 84,925
ORACLE CORP COMMON 68389X105 87,595,883 1,122,125 X 1,122,125
2,063,582 26,435 X 26,435
2,700,963 34,600 X 34,600
ORAPHARMA INC COMMON 68554E106 1,476,300 79,800 X 79,800
373,700 20,200 X 20,200
OUTBACK STEAKHOUSE INC COMMON 689899102 6,252,188 195,000 X 195,000
OXFORD HEALTH PLANS INC COMMON 691471106 7,428,885 487,140 X 487,140
Total 793,248,147
3/31/2000 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
344,955 22,620 X 22,620
P-COM INC COMMON 693262107 370,000 20,000 X 20,000
1,141,173 61,685 X 61,685
3,038,070 164,220 X 164,220
PE CORP-CELERA GENOMICS GRP COMMON 69332S201 92 1 X 1
PMC-SIERRA INC COMMON 69344F106 22,609,313 111,000 X 111,000
699,667 3,435 X 3,435
916,594 4,500 X 4,500
PSS WORLD MEDICAL INC COMMON 69366A100 177,669 26,200 X 26,200
536,566 79,125 X 79,125
1,376,526 202,990 X 202,990
PACTIV CORPORATION COMMON 695257105 1,738 200 X 200
PARAMETRIC TECHNOLOGY CORP COMMON 699173100 227,401,281 10,796,500 X 10,796,500
PEGASUS COMMUNICATIONS CORP COMMON 705904100 8,867,250 63,000 X 63,000
PENTON MEDIA INC COMMON 709668107 418,600 16,100 X 16,100
5,743,140 220,890 X 220,890
4,880,824 187,724 X 187,724
PEPSICO INC COMMON 713448108 67,214,588 1,927,300 X 1,927,300
140,965 4,042 X 4,042
PEREGRINE SYSTEMS INC COMMON 71366Q101 871,813 13,000 X 13,000
55,992,828 834,935 X 834,935
7,175,017 106,990 X 106,990
PERFORMANCE FOOD GROUP CO COMMON 713755106 10,972,500 501,600 X 501,600
5,280,800 241,408 X 241,408
PERSONNEL GROUP AMER INC COMMON 715338109 5,328,750 870,000 X 870,000
3,036,077 495,686 X 495,686
PETROLEO BRASILEIRO SA PETROBR COMMON 71654V101 1,336,632 49,100 X 49,100
PFIZER INC COMMON 717081103 87,446,531 2,391,700 X 2,391,700
1,293,581 35,380 X 35,380
1,901,250 52,000 X 52,000
PHILIP MORRIS COS INC COMMON 718154107 62,706,499 2,968,355 X 2,968,355
17,832,732 844,153 X 844,153
PHONE.COM INC COMMON 71920Q100 35,724,375 219,000 X 219,000
Total 642,778,395
3/31/2000 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
979,566 6,005 X 6,005
1,533,375 9,400 X 9,400
PHOTON DYNAMICS INC COMMON 719364101 23,322,000 338,000 X 338,000
6,134,238 88,902 X 88,902
PILOT NETWORK SERVICES INC COMMON 721596104 5,170,975 156,400 X 156,400
1,265,500 38,276 X 38,276
PINNACLE HOLDINGS COMMON 72346N101 20,328,250 378,200 X 378,200
5,630,044 104,745 X 104,745
PITNEY BOWES INC COMMON 724479100 207,575,672 4,645,050 X 4,645,050
PITTSTON BRINKS GROUP COMMON 725701106 6,491,875 381,875 X 381,875
349,588 20,564 X 20,564
PLIVA D.D. - GDR REG S COMMON 72917Q202 385,967 26,050 X 26,050
POGO PRODUCING CO COMMON 730448107 13,333,546 466,820 X 466,820
5,219,054 182,724 X 182,724
POHANG IRON & STL LTD COMMON 730450103 1,438,113 52,295 X 52,295
195,800 7,120 X 7,120
PORTAL SOFTWARE COMMON 736126103 6,878,050 120,800 X 120,800
POWER INTEGRATIONS INC COMMON 739276103 232,500 9,300 X 9,300
624,875 24,995 X 24,995
1,909,750 76,390 X 76,390
POWERTEL INC COMMON 73936C109 9,610,144 138,900 X 138,900
2,723,428 39,363 X 39,363
PRAXAIR INC COMMON 74005P104 10,283,456 247,050 X 247,050
211,247 5,075 X 5,075
PRE PAID LEGAL SVCS INC COMMON 740065107 16,901,094 569,300 X 569,300
5,066,528 170,662 X 170,662
PREMIER PKS INC COMMON 740540208 21,354,900 1,016,900 X 1,016,900
6,916,329 329,349 X 329,349
PRICE COMMUNICATIONS CORP COMMON 741437305 30,945,123 1,345,440 X 1,345,440
183,983 7,999 X 7,999
PRICE T ROWE & ASSOCIATES COMMON 741477103 233,050 5,900 X 5,900
782,693 19,815 X 19,815
1,955,843 49,515 X 49,515
Total 416,166,554
3/31/2000 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
PRICELINE.COM INC COMMON 741503106 70,024,000 875,300 X 875,300
PRIDE INTL INC COMMON 741932107 16,104,000 704,000 X 704,000
4,077,332 178,244 X 178,244
PRIORITY HEALTHCARE CORP COMMON 74264T102 14,808,675 294,700 X 294,700
5,372,579 106,917 X 106,917
PROCTER & GAMBLE CO COMMON 742718109 35,433,975 627,150 X 627,150
2,260 40 X 40
PROFESSIONAL DETAILING INC COMMON 74312N107 12,153,750 486,150 X 486,150
1,100,000 44,000 X 44,000
PROFESSIONAL STAFF-SPON COMMON 74315R105 131,625 27,000 X 27,000
PROVINCE HEALTHCARE CO COMMON 743977100 23,898,726 834,890 X 834,890
8,338,062 291,286 X 291,286
PSINET INC CONVERT 74437C408 5,916,280 134,080 X 134,080
40,595 920 X 920
QLT PHOTOTHERAPEUTICS INC. COMMON 746927102 585,650 10,600 X 10,600
9,982,294 180,675 X 180,675
8,943,981 161,882 X 161,882
QRS CORP COMMON 74726X105 173,075 2,300 X 2,300
536,909 7,135 X 7,135
1,411,690 18,760 X 18,760
QLOGIC CORP COMMON 747277101 9,647,600 71,200 X 71,200
185,906 1,372 X 1,372
QUALCOMM INC COMMON 747525103 17,798,050 119,200 X 119,200
662,052 4,434 X 4,434
1,313,950 8,800 X 8,800
QUEST SOFTWARE INC COMMON 74834T103 9,628,850 85,400 X 85,400
200,695 1,780 X 1,780
RSA SECURITY INC. COMMON 749719100 6,455,838 124,600 X 124,600
125,645 2,425 X 2,425
RWE AG COMMON 74975E303 36 1 X 1
RF MICRO DEVICES INC COMMON 749941100 73,677,813 548,300 X 548,300
199,547 1,485 X 1,485
RATIONAL SOFTWARE CORP COMMON 75409P202 260,853,525 3,409,850 X 3,409,850
Total 599,784,962
3/31/2000 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
291,465 3,810 X 3,810
RAYTHEON CO COMMON 755111309 2,333 124 X 124
755111408 266 15 X 15
22,365 1,260 X 1,260
READERS DIGEST ASSN INC COMMON 755267101 9,243,488 261,300 X 261,300
243,911 6,895 X 6,895
REDBACK NETWORKS COMMON 757209101 14,726,931 49,100 X 49,100
286,740 956 X 956
REGISTER.COM COMMON 75914G101 3,412,450 49,100 X 49,100
62,550 900 X 900
REMEDY CORP COMMON 759548100 728,763 17,300 X 17,300
46,112,553 1,094,660 X 1,094,660
5,964,689 141,595 X 141,595
RENT WAY INC COMMON 76009U104 8,419,281 431,758 X 431,758
602,453 30,895 X 30,895
REYNOLDS & REYNOLDS CO COMMON 761695105 28,144,800 1,042,400 X 1,042,400
RJ REYNOLDS TOBACCO HOLDINGS, INCCOMMON 76182K105 3,400 200 X 200
RITCHIE BROS. AUCTIONEERS COMMON 767744105 6,961,500 273,000 X 273,000
3,736,694 146,537 X 146,537
ROCHE HOLDINGS LTD COMMON 771195104 132,513 1,220 X 1,220
665,280 6,125 X 6,125
ROGERS COMMUNICATIONS - CL B COMMON 775109200 384,581 12,900 X 12,900
77,415,908 2,596,760 X 2,596,760
3,165,938 106,195 X 106,195
ROMAC INTL INC COMMON 775835101 8,546,844 943,100 X 943,100
2,416,488 266,647 X 266,647
ROSS STORES INC COMMON 778296103 409,063 17,000 X 17,000
1,165,828 48,450 X 48,450
3,349,139 139,185 X 139,185
ROYAL BANK OF CANADA COMMON 780087102 2,163 45 X 45
161,490 3,360 X 3,360
ROYAL DUTCH PETE CO COMMON 780257804 82,849,648 1,433,075 X 1,433,075
ROYAL OAK MINES INC COMMON 78051D105 96 8,204 X 8,204
Total 309,631,610
3/31/2000 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
ROYAL OAK MINES COMMON 78051D998 390 39,007 X 39,007
RURAL CELLULAR CORP - CL A COMMON 781904107 249,981 3,700 X 3,700
37,239,099 551,180 X 551,180
5,722,206 84,695 X 84,695
SBC COMMUNICATIONS INC COMMON 78387G103 98,644,963 2,341,720 X 2,341,720
SCI SYS INC COMMON 783890106 416,906,500 7,756,400 X 7,756,400
SK TELECOM CO LTD-ADR COMMON 78440P108 1,917,240 49,160 X 49,160
SPX CORP COMMON 784635104 15,723 138 X 138
SSI LTD - 144A SP GDR COMMON 784663106 980,000 70,000 X 70,000
SAFEWAY INC COMMON 786514208 100,657,720 2,224,480 X 2,224,480
29,075,840 642,560 X 642,560
ST PAUL COS INC COMMON 792860108 94,858,355 2,779,732 X 2,779,732
29,610,126 867,696 X 867,696
SANMINA CORP COMMON 800907107 324,300 4,800 X 4,800
1,074,919 15,910 X 15,910
2,618,723 38,760 X 38,760
SANTA FE SNYDER CORP COMMON 80218K105 6,108,500 643,000 X 643,000
SAP AG-SPONSORED ADR COMMON 803054204 94,757,525 1,585,900 X 1,585,900
SAPIENT CORP COMMON 803062108 754,875 9,000 X 9,000
SARA LEE CORP COMMON 803111103 14,040 780 X 780
105,282 5,849 X 5,849
SATYAM INFOWAY LIMITED COMMON 804099109 441,870 8,240 X 8,240
SAWTEK INC COMMON 805468105 204,994 3,900 X 3,900
154,686,181 2,942,900 X 2,942,900
6,453,887 122,785 X 122,785
SCHEIN PHARMACEUTICAL INC COMMON 806416103 7,352,494 447,300 X 447,300
1,902,164 115,721 X 115,721
SCHERING PLOUGH CORP COMMON 806605101 51,667,791 1,391,725 X 1,391,725
341,550 9,200 X 9,200
508,613 13,700 X 13,700
SCHLUMBERGER LTD COMMON 806857108 113,604,413 1,485,025 X 1,485,025
Total 1,258,800,262
3/31/2000 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
1,585,463 20,725 X 20,725
2,822,850 36,900 X 36,900
SCHOLASTIC CORP COMMON 807066105 172,600 3,200 X 3,200
506,473 9,390 X 9,390
1,405,881 26,065 X 26,065
SCHWEITZER-MAUDUIT INTL INC COMMON 808541106 9,056 700 X 700
SCIQUEST.COM INC COMMON 80908Q107 5,976,575 232,100 X 232,100
1,639,554 63,672 X 63,672
SEARS ROEBUCK & CO COMMON 812387108 1,531 50 X 50
SELECTICA INC COMMON 816288104 6,106,900 69,200 X 69,200
1,760,411 19,948 X 19,948
SELIGMAN CAPITAL FD INC COMMON 816326102 420,834 12,745 X 12,745
SELIGMAN COM STK FD INC COMMON 816332100 143,497 9,657 X 9,657
SELIGMAN COMM&INFO FD COMMON 816333108 172,316 3,148 X 3,148
SELIGMAN FRONTIER FD INC COMMON 816334106 46,224 2,547 X 2,547
SELIGMAN GROWTH FD INC COMMON 816335103 214,892 23,261 X 23,261
SELIGMAN US GOVT SECS FD- A COMMON 816336101 136,722 20,809 X 20,809
SELIGMAN HIGH YIELD BOND FUND COMMON 816336309 404,651 68,107 X 68,107
SELIGMAN INTERNATIONAL GROWTH FDCOMMON 81633C108 251,059 12,622 X 12,622
SELIGMAN GLB SMALLER COMPANIES FDCOMMON 81633C207 207,002 9,933 X 9,933
SELIGMAN EMERGING MKTS FD COMMON 81633C702 115,366 12,275 X 12,275
SELIGMAN GLB GROWTH FUND COMMON 81633C884 46,498 3,165 X 3,165
SELIGMAN LARGE CAP VALUE FD INC COMMON 816356109 221,458 23,456 X 23,456
SELIGMAN SMALL CAP VALUE-A COMMON 816356406 147,206 18,267 X 18,267
SENSORMATIC ELECTRS CORP COMMON 817265101 46,750,775 2,083,600 X 2,083,600
SEQUENOM INC COMMON 817337108 7,415,494 188,330 X 188,330
1,883,424 47,833 X 47,833
724 SOLUTIONS INC COMMON 81788Q100 4,948,875 39,750 X 39,750
Total 85,513,588
3/31/2000 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
99,600 800 X 800
SHERWIN WILLIAMS CO COMMON 824348106 15,488 700 X 700
SHIRE PHARMACEUTICALS-ADR COMMON 82481R106 445,875 8,700 X 8,700
1,358,638 26,510 X 26,510
3,660,019 71,415 X 71,415
SIEBEL SYS INC COMMON 826170102 34,642,847 290,050 X 290,050
841,437 7,045 X 7,045
1,230,206 10,300 X 10,300
SILICON LABORATORIES INC COMMON 826919102 8,133,150 91,900 X 91,900
158,415 1,790 X 1,790
SITEL CORP COMMON 82980K107 5,586,625 812,600 X 812,600
1,880,244 273,490 X 273,490
SMARTFORCE PUBLIC LIMITED CO COMMON 83170A206 458,750 10,000 X 10,000
20,882,300 455,200 X 455,200
11,455,767 249,717 X 249,717
SMITHKLINE BEECHAM COMMON 832378301 134,107 2,030 X 2,030
670,865 10,155 X 10,155
SNYDER COMMUNICATIONS INC COMMON 832914105 668,250 29,700 X 29,700
2,039,400 90,640 X 90,640
5,479,313 243,525 X 243,525
SNOWBALL.COM INC COMMON 83335R102 3,018,750 300,000 X 300,000
SOCIETE GENERALE FRANCE COMMON 83364L109 99,707 2,500 X 2,500
507,908 12,735 X 12,735
SOFTWARE.COM INC COMMON 83402P104 15,651,869 121,450 X 121,450
299,634 2,325 X 2,325
SONERA CORP-SPON ADR COMMON 835433202 13,308,188 200,500 X 200,500
SONICWALL INC COMMON 835470105 22,279,400 334,400 X 334,400
5,631,811 84,530 X 84,530
SOUTHTRUST CORP COMMON 844730101 254,375 10,000 X 10,000
737,688 29,000 X 29,000
2,088,164 82,090 X 82,090
SPECTRASITE HOLDINGS INC COMMON 84760T100 308,606 10,900 X 10,900
950,026 33,555 X 33,555
2,524,909 89,180 X 89,180
Total 167,502,329
3/31/2000 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
SPLITROCK SERVICES INC. COMMON 848636304 1,207,122 29,442 X 29,442
7,769 189 X 189
STAGE STORES INC COMMON 85254C107 1,041,250 1,190,000 X 1,190,000
STATE STR CORP COMMON 857477103 67,813 700 X 700
STEWART & STEVENSON SVCS INC COMMON 860342104 7,181,179 638,327 X 638,327
334,969 29,775 X 29,775
SGS-THOMSON MICROELECTRONICS COMMON 861012102 18,044,875 96,400 X 96,400
STRYKER CORP COMMON 863667101 11,006,550 157,800 X 157,800
213,435 3,060 X 3,060
SUMMIT BANCORP COMMON 866005101 81,426,844 3,101,975 X 3,101,975
23,156,884 882,167 X 882,167
SUN MICROSYSTEMS INC COMMON 866810104 13,348,010 142,450 X 142,450
644,678 6,880 X 6,880
955,772 10,200 X 10,200
SUNGARD DATA SYS INC COMMON 867363103 766,325 20,300 X 20,300
269,352,932 7,135,177 X 7,135,177
20,044,533 530,981 X 530,981
SURGUTNEFTEGAZ COMMON 868861204 699,764 48,600 X 48,600
SYBASE INC COMMON 871130100 538,281 26,500 X 26,500
44,171,156 2,174,580 X 2,174,580
4,416,547 217,430 X 217,430
SYBRON INTL CORP COMMON 87114F106 455,300 15,700 X 15,700
1,345,455 46,395 X 46,395
3,733,025 128,725 X 128,725
SYCAMORE NETWORKS INC COMMON 871206108 19,569,300 151,700 X 151,700
563,085 4,365 X 4,365
1,444,800 11,200 X 11,200
SYMANTEC CORP COMMON 871503108 180,300 2,400 X 2,400
392,137,475 5,219,800 X 5,219,800
1,525,038 20,300 X 20,300
SYMBOL TECHNOLOGIES INC COMMON 871508107 23,035,153 279,850 X 279,850
456,011 5,540 X 5,540
SYNOPSYS INC COMMON 871607107 414,375 8,500 X 8,500
Total 943,486,003
3/31/2000 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
295,526,400 6,062,080 X 6,062,080
3,395,925 69,660 X 69,660
TDK CORP-SPONSORED ADR COMMON 872351408 117,035 890 X 890
570,710 4,340 X 4,340
T&HQ INC COMMON 872443403 7,536,994 421,650 X 421,650
2,032,834 113,725 X 113,725
TJX COS INC NEW COMMON 872540109 4,725,938 213,000 X 213,000
TSI INTL SOFTWARE LTD COMMON 872879101 7,409,175 89,200 X 89,200
TV GUIDE INC - CL A COMMON 87307Q109 15,937,525 331,600 X 331,600
1,202 25 X 25
TAIWAN SEMICONDUCTOR MFG LTD-ADR COMMON 874039100 3,968,511 69,623 X 69,623
TANDY CORP COMMON 875382103 110,329,993 2,173,990 X 2,173,990
32,636,310 643,080 X 643,080
TEKELEC COMMON 879101103 30,891,713 832,100 X 832,100
8,697,274 234,270 X 234,270
TELE CELULAR SUL PART-ADR COMMON 879238103 625,000 12,500 X 12,500
TELE CENTRO SUL PARTICAPOES SA - COMMON 879239101 1,014,120 12,520 X 12,520
TELE CENTRO OESTE CEL -ADR COMMON 87923P105 813,750 70,000 X 70,000
TELE NORTE CELULAR PART-ADR COMMON 87924Y105 1,401,200 22,600 X 22,600
TELECOM ARGENTINA SA-SP ADR COMMON 879273209 695,000 20,000 X 20,000
TELESP PARTICIPACOES SA-ADR COMMON 87929A102 1,810,938 61,000 X 61,000
TELEFONICA DE ESPANA S A COMMON 879382208 20,390,672 274,160 X 274,160
874,948 11,764 X 11,764
TELEFONOS DE MEXICO S A COMMON 879403780 1,712,263 25,700 X 25,700
TELSTRA CORP-ADR (FINAL) COMMON 87969N204 48,739 2,074 X 2,074
255,422 10,869 X 10,869
TENNECO AUTOMOTIVE COMMON 880349105 318 40 X 40
TERADYNE INC COMMON 880770102 224,868,600 2,742,300 X 2,742,300
TEVA PHARMACEUTICAL-SP ADR COMMON 881624209 15,492,150 415,200 X 415,200
Total 793,780,655
3/31/2000 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
TEXACO INC COMMON 881694103 82,077,379 1,527,021 X 1,527,021
23,342,389 434,277 X 434,277
3DO CO COMMON 88553W105 31,743,031 3,276,700 X 3,276,700
TIME WARNER INC COMMON 887315109 14,770,000 147,700 X 147,700
TITAN CORPORATION COMMON 888266103 209,100 4,100 X 4,100
643,620 12,620 X 12,620
1,713,855 33,605 X 33,605
TOTAL FINA SA SPON ADR COMMON 89151E109 145,998 1,983 X 1,983
712,911 9,683 X 9,683
TRANS WORLD ENTMT CORP COMMON 89336Q100 4,867,250 486,725 X 486,725
280,600 28,060 X 28,060
TRANSWITCH CORP COMMON 894065101 20,541,913 213,700 X 213,700
5,433,081 56,521 X 56,521
TRICON GLOBAL RESTAURANTS COMMON 895953107 2,485 80 X 80
TRIBUNE CO NEW COMMON 896047107 21,938 600 X 600
TRITON PCS HOLDINGS INC CL A COMMON 89677M106 3,579,025 59,900 X 59,900
TRUE NORTH COMMUNICATIONS INC COMMON 897844106 5,754,564 146,380 X 146,380
285,016 7,250 X 7,250
TUBOS DE ACERO DE MEX COMMON 898592506 1,167,538 71,300 X 71,300
TUT SYSTEMS INC COMMON 901103101 7,570,394 127,100 X 127,100
2,045,674 34,345 X 34,345
TYCO INTL LTD NEW COMMON 902124106 89,150,220 1,778,558 X 1,778,558
3,854,111 76,890 X 76,890
5,794,450 115,600 X 115,600
UCAR INTL INC COMMON 90262K109 7,095,534 538,050 X 538,050
2,501,049 189,653 X 189,653
UST INC COMMON 902911106 6,250 400 X 400
USA NETWORKS INC COMMON 902984103 46,059,088 2,041,400 X 2,041,400
U S FOODSERVICE COMMON 90331R101 509,850 19,800 X 19,800
46,884,956 1,820,775 X 1,820,775
25,729,168 999,191 X 999,191
Total 434,492,435
3/31/2000 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
UNILEVER N V COMMON 904784709 25,843 537 X 537
UNICOM CORP COMMON 904911104 52,415,825 1,436,050 X 1,436,050
UNIGRAPHICS SOLUTIONS INC COMMON 904928108 6,849,631 231,700 X 231,700
UNION PAC RES GROUP INC COMMON 907834105 8,700 600 X 600
UNITED HEALTHCARE CORP COMMON 910581107 87,916,168 1,474,485 X 1,474,485
19,651,208 329,580 X 329,580
U S WEST INC COMMON 91273H101 81,400,279 1,120,830 X 1,120,830
24,214,264 333,415 X 333,415
UNITED TECHNOLOGIES CORP COMMON 913017109 258,067,228 4,084,150 X 4,084,150
33,934,847 537,050 X 537,050
UNITEDGLOBALCOM INC COMMON 913247508 25,971,625 346,000 X 346,000
UNIVERSAL STAINLESS & ALLOY COMMON 913837100 3,975,429 548,335 X 548,335
199,701 27,545 X 27,545
UNIVISION COMMUNICATIONS INC COMMON 914906102 327,700 2,900 X 2,900
12,589,895 111,415 X 111,415
2,691,095 23,815 X 23,815
URBAN OUTFITTERS INC COMMON 917047102 5,551,679 376,385 X 376,385
275,088 18,650 X 18,650
VALASSIS COMMUNICATIONS INC COMMON 918866104 33 1 X 1
VALERO ENERGY CORP NEW COMMON 91913Y100 10,867,671 354,140 X 354,140
747,701 24,365 X 24,365
VARIAN SEMICONDUCTOR EQUIP COMMON 922207105 706,238 11,100 X 11,100
2,118,713 33,300 X 33,300
5,812,462 91,355 X 91,355
VEECO INSTRS INC DEL COMMON 922417100 42,387,200 572,800 X 572,800
8,580,892 115,958 X 115,958
VENTIV HEALTH INC COMMON 922793104 X
- X -
X
VERIO INC COMMON 923433106 9,314,419 206,700 X 206,700
VERIO INC. CONVERT 923433304 5,314,781 94,485 X 94,485
Total 701,916,314
3/31/2000 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
28,969 515 X 515
VERITAS SOFTWARE CO COMMON 923436109 23,858,375 182,125 X 182,125
993,439 7,584 X 7,584
1,070,925 8,175 X 8,175
VERISIGN COMMON 92343E102 25,033,775 167,450 X 167,450
739,726 4,948 X 4,948
1,240,850 8,300 X 8,300
VERSATA INC COMMON 925298101 1,576,913 26,200 X 26,200
24,075 400 X 400
VERTICALNET INC COMMON 92532L107 6,759,200 49,700 X 49,700
2,461,872 18,102 X 18,102
VIATEL INC COMMON 925529208 402 8 X 8
VIDESH SANCHAR NIGAM-SP COMMON 92659G105 721,540 34,200 X 34,200
VIGNETTE CORPORATION COMMON 926734104 7,924,363 49,450 X 49,450
151,436 945 X 945
VIRATA CORPORATION COMMON 927646109 4,913,850 49,200 X 49,200
1,476,352 14,782 X 14,782
VISHAY INTERTECHNOLOGY INC COMMON 928298108 181,309,688 3,259,500 X 3,259,500
VISUAL NETWORKS INC COMMON 928444108 14,091,025 248,300 X 248,300
3,955,702 69,704 X 69,704
VITESSE SEMICONDUCTOR CORP COMMON 928497106 25,987,500 270,000 X 270,000
4,770,343 49,562 X 49,562
VIVENDI (EX-GEN EAUX) SP ADR COMMON 92851S105 140,912 6,110 X 6,110
717,474 31,110 X 31,110
VODAFONE AIRTOUCH PLC-SP ADR COMMON 92857T107 121,960 2,195 X 2,195
593,963 10,690 X 10,690
WPP GROUP PLC COMMON 929309300 221,646 2,555 X 2,555
1,111,354 12,811 X 12,811
WABASH NATL CORP COMMON 929566107 14 1 X 1
WAL MART STORES INC COMMON 931142103 168,032,130 2,974,020 X 2,974,020
2,587,870 45,803 X 45,803
3,124,450 55,300 X 55,300
WAL-MART DE MEXICO SA -SP ADR COMMON 93114W107 861,115 34,450 X 34,450
Total 486,603,206
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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
WALGREEN CO COMMON 931422109 6,864,950 266,600 X 266,600
325,609 12,645 X 12,645
489,250 19,000 X 19,000
WASHINGTON MUT INC COMMON 939322103 77,739,473 2,933,565 X 2,933,565
20,895,701 788,517 X 788,517
WATSON PHARMACEUTICALS INC COMMON 942683103 27,054,969 681,700 X 681,700
336,352 8,475 X 8,475
WEATHERFORD INTERNATIONAL COMMON 947074100 16,321,500 279,000 X 279,000
321,750 5,500 X 5,500
WEBSENSE INC COMMON 947684106 797,838 16,600 X 16,600
158,606 3,300 X 3,300
WELLS FARGO CO COMMON 949746101 2,738,400 67,200 X 67,200
1,630 40 X 40
WET SEAL INC COMMON 961840105 4,503,965 285,966 X 285,966
371,070 23,560 X 23,560
WILLIAMS COS INC DEL COMMON 969457100 120,599,650 2,744,800 X 2,744,800
782,747 17,815 X 17,815
1,195,100 27,200 X 27,200
WILLIAMS-SONOMA INC COMMON 969904101 368,900 11,900 X 11,900
1,123,905 36,255 X 36,255
3,022,035 97,485 X 97,485
WILMAR INDS INC COMMON 971426101 6,408,675 375,600 X 375,600
WIND RIVER SYSTEMS INC COMMON 973149107 8,272,250 228,200 X 228,200
WINDMERE-DURABLE HLDGS INC COMMON 973411101 7,617,225 516,422 X 516,422
475,171 32,215 X 32,215
WORLD ACCESS INC COMMON 98141A101 1,877,406 98,165 X 98,165
10,519 550 X 550
XILINX INC COMMON 983919101 58,432,500 705,600 X 705,600
1,979,219 23,900 X 23,900
2,641,719 31,900 X 31,900
XIRCOM INC COMMON 983922105 132,460,000 3,580,000 X 3,580,000
XEROX CORP COMMON 984121103 13,936 536 X 536
33,670 1,295 X 1,295
Total 506,235,686
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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
YAGEO CORP - 144A COMMON 984326108 68,383 9,292 X 9,292
YAHOO INC COMMON 984332106 1,714 10 X 10
YUPI INTERNET INC SER C COMMON 988996997 7,000,004 608,696 X 608,696
ZIFF-DAVIS INC COMMON 989511100 32,482,813 2,078,900 X 2,078,900
ZIFF DAVIS INC - ZDNET COMMON 989511209 15,189,500 714,800 X 714,800
DAIMLERCHRYSLER AG COMMON D1668R123 46,890,746 716,573 X 716,573
ACE LTD COMMON G0070K103 288,225 12,600 X 12,600
17,852,794 780,450 X 780,450
2,754,722 120,425 X 120,425
AMDOCS LTD COMMON G02602103 113,412,400 1,532,600 X 1,532,600
CHINA.COM CORP - CL A COMMON G2108N109 10,878,300 134,300 X 134,300
2,946,456 36,376 X 36,376
FRESH DEL MONTE PRODUCE INC COMMON G36738105 6,507,770 765,620 X 765,620
323,893 38,105 X 38,105
GLOBAL CROSSING LTD COMMON G3921A100 43,062,156 1,051,900 X 1,051,900
RENAISSANCE RE HLDGS LTD COMMON G7496G103 7,287,604 178,290 X 178,290
562,440 13,760 X 13,760
HILFIGER TOMMY CORP COMMON G8915Z102 13,050 900 X 900
TRANSOCEAN SEDCO FOREX INC COMMON G90078109 374,581 7,300 X 7,300
1,124,667 21,918 X 21,918
3,052,324 59,485 X 59,485
SBS BROADCASTING SA COMMON L8137F102 430,500 7,000 X 7,000
26,270,340 427,160 X 427,160
13,347,038 217,025 X 217,025
AUDIOCODES LTD COMMON M15342104 1,656,188 16,500 X 16,500
CHECK POINT SOFTWARE TECH LTD COMMON M22465104 322,837,703 1,887,250 X 1,887,250
E-SIMS LTD COMMON M40990109 1,442,250 64,100 X 64,100
GILAT SATELLITE NETWORKS LTD COMMON M51474100 84,548,975 721,100 X 721,100
LANOPTICS LTD COMMON M6706C103 41,800 2,200 X 2,200
Total 762,649,334
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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
METALINK LTD COMMON M69897102 13,925,136 362,870 X 362,870
3,970,853 103,475 X 103,475
ORBOTECH LTD COMMON M75253100 237,290,250 2,791,650 X 2,791,650
4,808,280 56,568 X 56,568
RADVISION LTD COMMON M81869105 1,728,375 33,000 X 33,000
RADWARE LTD COMMON M81873107 8,067,750 208,200 X 208,200
2,462,563 63,550 X 63,550
TECNOMATIX TECHNOLOGIES LTD COMMON M8743P105 59,202,538 1,364,900 X 1,364,900
TTI TEAM TELECOM INTL LTD COMMON M88258104 1,692,900 51,300 X 51,300
COMPLETEL EUROPE NV COMMON N21590109 1,994 100 X 100
3,786,131 189,900 X 189,900
574,200 28,800 X 28,800
MADGE NETWORKS N.V. COMMON N5424G106 160,650 18,900 X 18,900
467,670 55,020 X 55,020
1,320,475 155,350 X 155,350
SAPIENS INTL CORP COMMON N7716A102 1,250,725 102,100 X 102,100
AGORA-GDR COMMON US00848R1 17,745 640 X 640
AL-AHRAM BEVERAGES CO -GDR COMMON US0102032 584,839 30,800 X 30,800
BORSODCHEM RT-SPONSORED GDR COMMON US1000642 757,758 19,500 X 19,500
FAR EASTERN TEXTILE LTD. COMMON US3073313 1,113,000 42,000 X 42,000
GRUPO TELEVISA SA-SPONS COMMON US40049J2 1,108,400 16,300 X 16,300
HON HAI PRECISION INDUSTRY CO. COMMON US4380902 13,629,541 587,500 X 587,500
MAHANAGAR TELE NIGAM COMMON US5597782 1,016,304 94,300 X 94,300
PANAFON HELLENIC TELECOM COMMON US6981131 365,509 24,800 X 24,800
US6981132 219,600 14,900 X 14,900
SAMSUNG ELECTRONICS COMMON US7960502 36,761 478 X 478
US7960508 17,899,360 118,108 X 118,108
TELEKOMUNIKACJA POLSKA- COMMON US87943D2 608,631 66,500 X 66,500
TURKIYE IS BANKASI COMMON US9001512 318,117 73,500 X 73,500
Total 378,386,055
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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
UNIAO DE BANCOS BRASILIEROS COMMON US90458E1 971,550 30,600 X 30,600
OTP BANK COMMON USX607461 773,947 14,350 X 14,350
LARSEN & TOUBRO LTD. COMMON USY5217N1 937,631 71,100 X 71,100
MAHINDRA & MAHINDRA COMMON USY541641 626,682 72,870 X 72,870
SILICONWARE PRECISION-SP COMMON USY7934R1 8,931,233 799,439 X 799,439
VIDESH SANCHAR NIGAM LTD-GDR COMMON USY9371X1 558,666 26,480 X 26,480
YAGEO CORPORATION COMMON USY9723R1 2,379,014 323,263 X 323,263
CREATIVE TECHNOLOGY LTD COMMON Y1775U107 295,802,050 9,316,600 X 9,316,600
FLEXTRONICS INTL LTD COMMON Y2573F102 7,663,600 108,800 X 108,800
Total 318,644,372
Grand Total c
Total Number of Securities 741
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