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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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<PAGE> PAGE 11
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SIGNATURE FRANK STRAUSS
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000060332
<NAME> CGM CAPITAL DEVELOPMENT FUND
<SERIES>
<NUMBER> 1
<NAME> CGM CAPITAL DEVELOPMENT FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 557355928
<INVESTMENTS-AT-VALUE> 636090456
<RECEIVABLES> 3250611
<ASSETS-OTHER> 444
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 639341511
<PAYABLE-FOR-SECURITIES> 1953663
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4850776
<TOTAL-LIABILITIES> 6804439
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 557539898
<SHARES-COMMON-STOCK> 24140456
<SHARES-COMMON-PRIOR> 28197266
<ACCUMULATED-NII-CURRENT> 243258
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (3980612)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 78734528
<NET-ASSETS> 632537072
<DIVIDEND-INCOME> 9430258
<INTEREST-INCOME> 135187
<OTHER-INCOME> 0
<EXPENSES-NET> 6700328
<NET-INVESTMENT-INCOME> 2865117
<REALIZED-GAINS-CURRENT> 11715570
<APPREC-INCREASE-CURRENT> 27062257
<NET-CHANGE-FROM-OPS> 41642944
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2621859
<DISTRIBUTIONS-OF-GAINS> 13266691
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 772324
<NUMBER-OF-SHARES-REDEEMED> 5359335
<SHARES-REINVESTED> 530201
<NET-CHANGE-IN-ASSETS> (70880892)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (2429491)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6128531
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6700328
<AVERAGE-NET-ASSETS> 618793294
<PER-SHARE-NAV-BEGIN> 24.95
<PER-SHARE-NII> 0.12
<PER-SHARE-GAIN-APPREC> 1.80
<PER-SHARE-DIVIDEND> 0.11
<PER-SHARE-DISTRIBUTIONS> 0.56
<RETURNS-OF-CAPITAL> 0
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<EXPENSE-RATIO> 1.08
</TABLE>
February 8, 2000
To the Board of Trustees and the Shareholders of the
CGM Capital Development Fund
In planning and performing our audit of the financial
statements of the CGM Capital Development Fund (the "Fund")
for the year ended December 31, 1999, we considered its
internal control, including control activities for
safeguarding securities, in order to determine our auditing
procedures for the purpose of expressing our opinion on the
financial statements and to comply with the requirements of
Form N-SAR, not to provide assurance on internal control.
The management of the Fund is responsible for establishing and
maintaining internal control. In fulfilling this
responsibility, estimates and judgments by management are
required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit
pertain to the entity's objective of preparing financial
statements for external purposes that are fairly presented in
conformity with generally accepted accounting principles.
Those controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, errors or
fraud may occur and not be detected. Also, projection of any
evaluation of internal control to future periods is subject to
the risk that it may become inadequate because of changes in
conditions or that the effectiveness of the design and
operation may deteriorate.
Our consideration of internal control would not necessarily
disclose all matters in internal control that might be
material weaknesses under standards established by the
American Institute of Certified Public Accountants. A
material weakness is a condition in which the design or
operation of one or more of the internal control components
does not reduce to a relatively low level the risk that
misstatements caused by error or fraud in amounts that would
be material in relation to the financial statements being
audited may occur and not be detected within a timely period
by employees in the normal course of performing their assigned
functions. However, we noted no matters involving internal
control and its operation, including controls for safeguarding
securities, that we consider to be material weaknesses as
defined above as of December 31, 1999.
This report is intended solely for the information and use of
the Board of Trustees, management and the Securities and
Exchange Commission and is not intended to be and should not
be used by anyone other than these specified parties.
PricewaterhouseCoopers LLP
Boston, Massachusetts
