Report of Independent Registered Public Accounting Firm

To the Shareholders and
Board of Trustees of Massachusetts Investors Growth Stock Fund

In planning and performing our audit of the financial statements
of Massachusetts Investors Growth Stock Fund (the "Fund") as of
and for the year ended November 30, 2021, in accordance with the
standards of the Public Company Accounting Oversight Board
(United States), we considered the Fund's internal control over
financial reporting, including controls over safeguarding
securities, as a basis for designing our auditing procedures
for the purpose of expressing our opinion on the financial
statements and to comply with the requirements of Form N-CEN,
but not for the purpose of expressing an opinion on the
effectiveness of the Fund's internal control over financial
reporting. Accordingly, we express no such opinion.
The management of the Fund is responsible for establishing and
maintaining effective internal control over financial reporting.
In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and
related costs of controls. A company's internal control over
financial reporting is a process designed to provide reasonable
assurance regarding the reliability of financial reporting and
the preparation of financial statements for external purposes
in accordance with U.S. generally accepted accounting principles.
A company's internal control over financial reporting includes
those policies and procedures that (1) pertain to the
maintenance of records that, in reasonable detail, accurately
and fairly reflect the transactions and dispositions of the
assets of the company; (2) provide reasonable assurance that
transactions are recorded as necessary to permit preparation
of financial statements in accordance with U.S. generally
accepted accounting principles, and that receipts and
expenditures of the company are being made only in accordance
with authorizations of management and directors of the company;
and (3) provide reasonable assurance regarding prevention or
timely detection of unauthorized acquisition, use or
disposition of a company's assets that could have a material
effect on the financial statements.
Because of its inherent limitations, internal control over
financial reporting may not prevent or detect misstatements.
Also, projections of any evaluation of effectiveness to future
periods are subject to the risk that controls may become
inadequate because of changes in conditions, or that the degree
of compliance with the policies or procedures may deteriorate.
A deficiency in internal control over financial reporting exists
when the design or operation of a control does not allow
management or employees, in the normal course of performing their
assigned functions, to prevent or detect misstatements on a timely
basis. A material weakness is a deficiency, or a combination of
deficiencies, in internal control over financial reporting, such
that there is a reasonable possibility that a material misstatement
of the company's annual or interim financial statements will not
be prevented or detected on a timely basis.
Our consideration of the Fund's internal control over financial
reporting was for the limited purpose described in the first
paragraph and would not necessarily disclose all deficiencies in
internal control that might be material weaknesses under standards
established by the Public Company Accounting Oversight Board (United
States). However, we noted no deficiencies in the Fund's internal
control over financial reporting and its operation, including
controls over safeguarding securities, that we consider to be a
material weakness as defined above as of November 30, 2021.
This report is intended solely for the information and use of
management and the Board of Trustees of Massachusetts Investors
Growth Stock Fund and the Securities and Exchange Commission and
is not intended to be and should not be used by anyone other than
these specified parties.

/s/ Ernst & Young LLP

Boston, Massachusetts
January 14, 2022