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Form NSAR-A TEKLA LIFE SCIENCES INVE For: Mar 31

May 25, 2018 11:02 AM EDT
      PAGE  1
000 A000000 03/31/2018
000 C000000 0000884121
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 TEKLA LIFE SCIENCES INVESTORS
001 B000000 811-6565
001 C000000 6177728500
002 A000000 100 Federal Street, 19th Floor
002 B000000 BOSTON
002 C000000 MA
002 D010000 02110
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 TEKLA CAPITAL MANAGEMENT LLC
008 B000001 A
008 C000001 801-000000
008 D010001 BOSTON
008 D020001 MA
008 D030001 02110
010 A000001 STATE STREET BANK AND TRUST CO.
010 B000001 85-85003
010 C010001 BOSTON
010 C020001 MA
010 C030001 02111
012 A000001 COMPUTERSHARE TRUST CO. N.A.
012 B000001 85-113400
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02110
015 A000001 STATE STREET BANK & TRUST CO.
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
015 E010001 X
018  000000 Y
019 A000000 Y
      PAGE  2
019 B000000    4
019 C000000 TEKLAFUNDS
020 A000001 NATIONAL FINANCIAL SERVICES CORP.
020 B000001 04-2785576
020 C000001     37
020 A000002 JP MORGAN CHASE & CO.
020 B000002 13-3224013
020 C000002     28
020 A000003 BANK OF NEW YORK MELLON
020 B000003 13-5160382
020 C000003     21
020 A000004 JEFFERIES & CO.
020 B000004 95-2622900
020 C000004     13
020 A000005 OPPENHEIMER & CO., INC.
020 B000005 13-5657518
020 C000005     10
020 A000006 MIZUHO CORPORATE BANK LTD.
020 B000006 13-5624234
020 C000006      7
020 A000007 WEDBUSH MORGAN SECURITIES, INC.
020 B000007 95-2495390
020 C000007      6
020 A000008 MORGAN STANLEY
020 B000008 13-2655998
020 C000008      6
020 A000009 SANFORD C. BERNSTEIN CO., LLC
020 B000009 13-2625874
020 C000009      5
020 A000010 WELLS FARGO BANK
020 B000010 94-3379992
020 C000010      5
021  000000      148
022 A000001 STATE STREET BANK AND TRUST CO.
022 B000001 04-1867445
022 C000001   1141418
022 D000001         0
022 A000002 JPMORGAN CHASE & CO.
022 B000002 13-3224016
022 C000002      2722
022 D000002         0
022 A000003 GOLDMAN SACHS
022 B000003 13-5108880
022 C000003      1790
022 D000003         0
022 A000004 NATIONAL FINANCIAL SERVICES CORP.
022 B000004 04-2785576
022 C000004      1265
022 D000004         0
022 A000005 JEFFERIES & CO.
022 B000005 95-2622900
      PAGE  3
022 C000005       800
022 D000005         0
022 A000006 ILLUMINOSS MEDICAL, INC
022 C000006       475
022 D000006         0
022 A000007 BANK OF NEW YORK MELLON
022 B000007 13-5160382
022 C000007       390
022 D000007         0
022 A000008 GENOMEDX BIOSCEINCES, INC.
022 C000008       137
022 D000008         0
022 A000009 AMPHIVENA THERAPEUTICS, INC.
022 C000009       113
022 D000009         0
023 C000000    1149110
023 D000000          0
024  000000 N
025 D000001       0
025 D000002       0
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
028 A010000         0
028 A020000         0
028 A030000         0
028 A040000         0
028 B010000         0
028 B020000         0
028 B030000         0
028 B040000         0
028 C010000         0
028 C020000         0
028 C030000         0
028 C040000         0
028 D010000         0
028 D020000         0
028 D030000         0
028 D040000         0
028 E010000         0
028 E020000         0
028 E030000         0
028 E040000         0
028 F010000         0
      PAGE  4
028 F020000         0
028 F030000         0
028 F040000         0
028 G010000         0
028 G020000         0
028 G030000         0
028 G040000         0
028 H000000         0
030 A000000      0
030 B000000  0.00
030 C000000  0.00
031 A000000      0
031 B000000      0
032  000000      0
033  000000      0
035  000000      0
036 B000000      0
038  000000      0
042 A000000   0
042 B000000   0
042 C000000   0
042 D000000   0
042 E000000   0
042 F000000   0
042 G000000   0
042 H000000   0
043  000000      0
044  000000      0
045  000000 Y
046  000000 N
047  000000 N
048  000000  0.000
048 A010000        0
048 A020000 0.000
048 B010000        0
048 B020000 0.000
048 C010000        0
048 C020000 0.000
048 D010000        0
048 D020000 0.000
048 E010000        0
048 E020000 0.000
048 F010000        0
048 F020000 0.000
048 G010000        0
048 G020000 0.000
048 H010000        0
048 H020000 0.000
048 I010000        0
048 I020000 0.000
048 J010000        0
      PAGE  5
048 J020000 0.000
048 K010000        0
048 K020000 0.000
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 N
054 A000000 Y
054 B000000 N
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 N
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 N
055 B000000 N
056  000000 N
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 N
060 B000000 N
061  000000        0
062 A000000 N
062 B000000   0.0
062 C000000   0.0
062 D000000   0.0
062 E000000   0.0
062 F000000   0.0
062 G000000   0.0
062 H000000   0.0
062 I000000   0.0
062 J000000   0.0
062 K000000   0.0
062 L000000   0.0
062 M000000   0.0
062 N000000   0.0
062 O000000   0.0
062 P000000   0.0
062 Q000000   0.0
062 R000000   0.0
063 A000000   0
      PAGE  6
063 B000000  0.0
066 A000000 Y
066 B000000 N
066 C000000 Y
066 D000000 N
066 E000000 N
066 F000000 N
066 G000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 Y
070 B010000 Y
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 N
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000     92063
071 B000000     95616
071 C000000    437797
      PAGE  7
071 D000000   21
072 A000000  6
072 B000000       55
072 C000000      942
072 D000000        0
072 E000000        0
072 F000000     2199
072 G000000       45
072 H000000        0
072 I000000       26
072 J000000       57
072 K000000       42
072 L000000       26
072 M000000       70
072 N000000        0
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       50
072 S000000       88
072 T000000      110
072 U000000        0
072 V000000        0
072 W000000       64
072 X000000     2777
072 Y000000        0
072 Z000000    -1780
072AA000000     1975
072BB000000        0
072CC010000        0
072CC020000    19939
072DD010000        0
072DD020000        0
072EE000000    17998
073 A010000   0.0000
073 A020000   0.0000
073 B000000   0.8300
073 C000000   0.0000
074 A000000        0
074 B000000     3537
074 C000000        0
074 D000000     1023
074 E000000    18818
074 F000000   396632
074 G000000        0
074 H000000        0
074 I000000    16892
074 J000000        0
074 K000000        0
074 L000000       87
074 M000000      648
      PAGE  8
074 N000000   437637
074 O000000        0
074 P000000      382
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000      305
074 S000000        0
074 T000000   436950
074 U010000    22008
074 U020000        0
074 V010000    19.85
074 V020000     0.00
074 W000000   0.0000
074 X000000      178
074 Y000000        0
075 A000000        0
075 B000000   443286
076  000000    19.22
077 A000000 N
078  000000 N
080 C000000        0
081 B000000   0
082 B000000        0
083 B000000        0
084 B000000        0
086 A010000    436
086 A020000   8341
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 TEKLA LIFE SCIENCES INVESTORS
087 A020000 87911K100
087 A030000 HQL
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   LAURA WOODWARD
TITLE       TREASURER
 



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