000 A000000 05/31/2013
000 C000000 0000063090
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MASSACHUSETTS INVESTORS GROWTH STOCK FUND
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001 C000000 6179545000
002 A000000 111 HUNTINGTON AVE
002 B000000 BOSTON
002 C000000 MA
002 D010000 02199
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
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007 C010100  1
008 A000001 MASSACHUSETTS FINANCIAL SERVICES COMPANY
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008 D010001 BOSTON
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010 A000001 MASSACHUSETTS FINANCIAL SERVICES
010 B000001 801-17352
010 C010001 BOSTON
010 C020001 MA
010 C030001 02199
011 A000001 MFS FUND DISTRIBUTORS, INC.
011 B000001 8-27864
011 C010001 BOSTON
011 C020001 MA
011 C030001 02199
012 A000001 MFS SERVICE CENTER, INC.
012 B000001 84-1316
012 C010001 BOSTON
012 C020001 MA
012 C030001 02199
013 A000001 ERNST & YOUNG, LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
013 B040001 1617
015 A000001 JP MORGAN CHASE BANK
015 B000001 C

015 C010001 NEW YORK
015 C020001 NY
015 C030001 10081
015 E010001 X
015 A000002 THE BANK OF NEW YORK
015 B000002 S
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10286
015 E010002 X
015 A000003 BANK OF AMERICA/MERRILL LYNCH
015 B000003 C
015 C010003 Charlotte
015 C020003 NC
015 C030003 28255
015 E010003 X
018  000000 Y
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020 B000001 00-0000000
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020 A000002 CREDIT SUISSE GROUP
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020 C000002    118
020 A000003 GOLDMAN SACHS GROUP, INC.
020 B000003 13-5108880
020 C000003    117
020 A000004 JPMORGAN CHASE & CO.
020 B000004 13-3224017
020 C000004     98
020 A000005 UBS AG
020 B000005 13-2638166
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020 A000006 CITIGROUP, INC.
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020 A000007 DEUTSCHE BANK AG
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020 A000008 MORGAN STANLEY
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020 A000009 BARCLAYS PLC
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025 C000002 E
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SIGNATURE   KINO CLARK
TITLE       ASSISTANT TREASURER

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