REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Board of Trustees of Tidal ETF Trust and
Shareholders of RPAR Risk Parity ETF and
UPAR Ultra Risk Parity ETF
Milwaukee, Wisconsin
In planning and performing our audit of the financial statements of RPAR Risk Parity ETF and UPAR Ultra Risk Parity ETF, each a series of shares of Tidal
ETF Trust (the “Funds”) as of and for the period ended December 31, 2022, in accordance with the standards of the Public Company Accounting Oversight Board (United States), we considered their internal control over financial reporting, including
control activities for 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 Funds’ internal control over financial reporting. Accordingly, we express no such opinion.
The management of the Funds 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 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 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 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 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.
Board of Trustees of Tidal ETF Trust and
Shareholders of RPAR Risk Parity ETF and
UPAR Ultra Risk Parity ETF
Page Two
Our consideration of the Funds’ 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 significant deficiencies or material weaknesses under standards established by the Public Company Accounting Oversight Board (United States). However, we noted no deficiencies
in the Funds’ internal control over financial reporting and its operation, including controls for safeguarding securities, which we consider to be material weaknesses, as defined above, as of December 31, 2022.
This report is intended solely for the information and use of management, Shareholders and Board of Trustees of Tidal ETF 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.
TAIT, WELLER & BAKER LLP
/s/ TAIT, WELLER & BAKER LLP
Philadelphia, Pennsylvania
March 1, 2023