REPORT OF INDEPENDENT REGISTERED
PUBLIC ACCOUNTING FIRM

To the shareholders and Board of Trustees of
Lord Abbett Securities Trust:

In planning and performing our audits of the
financial statements of Lord Abbett Securities Trust
(the "Trust"), including the Lord Abbett Micro-Cap
Growth Fund, Lord Abbett Micro-Cap Value Fund,
Lord Abbett Alpha Strategy Fund, Lord Abbett
Fundamental Equity Fund, Lord Abbett Global
Equity Research Fund (formerly Lord Abbett
Global Core Equity Fund), Lord Abbett Global
Select Equity Fund, Lord Abbett Growth Leaders
Fund, Lord Abbett International Equity Fund, Lord
Abbett International Opportunities Fund, Lord
Abbett International Value Fund (formerly Lord
Abbett International Dividend Income Fund), and
Lord Abbett Value Opportunities Fund, as of and
for the year ended October 31, 2018, in accordance
with the standards of the Public Company
Accounting Oversight Board (United States)
(PCAOB), we considered the Trust'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 Trust's
internal control over financial reporting.
Accordingly, we express no such opinion.

The management of the Trust 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 trust'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 generally accepted
accounting principles. A trust'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 trust; (2) provide reasonable assurance
that transactions are recorded as necessary to permit
preparation of financial statements in accordance
with generally accepted accounting principles, and
that receipts and expenditures of the trust are being
made only in accordance with authorizations of
management and trustees of the trust; and (3)
provide reasonable assurance regarding prevention
or timely detection of unauthorized acquisition, use,
or disposition of a trust'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 trust's annual or interim financial statements
will not be prevented or detected on a timely basis.

Our consideration of the Trust'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 PCAOB. However, we
noted no deficiencies in the Trust's internal control
over financial reporting and its operation, including
controls for safeguarding securities, that we
consider to be a material weakness, as defined
above, as of October 31, 2018.

This report is intended solely for the information
and use of management and the Board of Trustees
of the Trust 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/DELOITTE & TOUCHE LLP

New York, New York
December 21, 2018