Report of Independent Registered Public
Accounting Firm
To the Board of Trustees of Janus Detroit
Street Trust and Shareholders of Janus
Henderson Small/Mid Cap Growth Alpha ETF:
Opinion on the Financial Statements
We have audited the accompanying statement
of assets and liabilities, including the schedule
of investments, of Janus Henderson Small/Mid
Cap Growth Alpha ETF (one of the funds
constituting Janus Detroit Street Trust,
referred to hereafter as the "Fund") as of
October 31, 2018, the related statement of
operations for the year ended October 31, 2018,
the statements of changes in net assets for each
of the two years in the period ended October
31, 2018, including the related notes, and the
financial highlights for each of the two years in
the period ended October 31, 2018 and for the
period February 23, 2016 (commencement
date) through October 31, 2016 (collectively
referred to as the "financial statements"). In
our opinion, the financial statements present
fairly, in all material respects, the financial
position of the Fund as of October 31, 2018, the
results of its operations for the year then
ended, the changes in its net assets for each of
the two years in the period ended October 31,
2018 and the financial highlights for each of
the two years in the period ended October 31,
2018 and for the period February 23, 2016
(commencement date) through October 31,
2016 in conformity with accounting principles
generally accepted in the United States of
America.
Basis for Opinion
These financial statements are the
responsibility of the Fund's management. Our
responsibility is to express an opinion on the
Fund's financial statements based on our
audits. We are a public accounting firm
registered with the Public Company
Accounting Oversight Board (United States)
("PCAOB") and are required to be independent
with respect to the Fund in accordance with the
U.S. federal securities laws and the applicable
rules and regulations of the Securities and
Exchange Commission and the PCAOB.
We conducted our audits of these financial
statements in accordance with the standards of
the PCAOB. Those standards require that we
plan and perform the audit to obtain
reasonable assurance about whether the
financial statements are free of material
misstatement, whether due to error or fraud.
Our audits included performing procedures to
assess the risks of material misstatement of the
financial statements, whether due to error or
fraud, and performing procedures that respond
to those risks. Such procedures included
examining, on a test basis, evidence regarding
the amounts and disclosures in the financial
statements. Our audits also included evaluating
the accounting principles used and significant
estimates made by management, as well as
evaluating the overall presentation of the
financial statements. Our procedures included
confirmation of securities owned as of October
31, 2018 by correspondence with the custodian
and transfer agent. We believe that our audits
provide a reasonable basis for our opinion.

 Denver, Colorado
December 20, 2018
We have served as the auditor of one or more
investment companies in Janus Henderson Funds since
1990.