Disclaimer CAUTION REGARDING FORWARD-LOOKING STATEMENTSThis communication may contain certain
forward-looking statements, including, but not limited to, certain plans, expectations, goals, projections, and statements about the benefits of the proposed transaction, the plans, objectives, expectations and intentions of Huntington and
TCF, the expected timing of completion of the transaction, and other statements that are not historical facts. Such statements are subject to numerous assumptions, risks, and uncertainties. Statements that do not describe historical or
current facts, including statements about beliefs and expectations, are forward-looking statements. Forward-looking statements may be identified by words such as expect, anticipate, believe, intend, estimate, plan, target, goal, or similar
expressions, or future or conditional verbs such as will, may, might, should, would, could, or similar variations. The forward-looking statements are intended to be subject to the safe harbor provided by Section 27A of the Securities Act of
1933, Section 21E of the Securities Exchange Act of 1934, and the Private Securities Litigation Reform Act of 1995.While there is no assurance that any list of risks and uncertainties or risk factors is complete, below are certain factors
which could cause actual results to differ materially from those contained or implied in the forward-looking statements: changes in general economic, political, or industry conditions; the magnitude and duration of the COVID-19 pandemic and
its impact on the global economy and financial market conditions and our business, results of operations, and financial condition; uncertainty in U.S. fiscal and monetary policy, including the interest rate policies of the Federal Reserve
Board; volatility and disruptions in global capital and credit markets; movements in interest rates; reform of LIBOR; competitive pressures on product pricing and services; success, impact, and timing of our business strategies, including
market acceptance of any new products or services including those implementing our “Fair Play” banking philosophy; the nature, extent, timing, and results of governmental actions, examinations, reviews, reforms, regulations, and
interpretations, including those related to the Dodd-Frank Wall Street Reform and Consumer Protection Act and the Basel III regulatory capital reforms, as well as those involving the OCC, Federal Reserve, FDIC, and CFPB; the occurrence of any
event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the merger agreement between Huntington and TCF; the outcome of any legal proceedings that may be instituted against Huntington
or TCF; delays in completing the transaction; the failure to obtain necessary regulatory approvals (and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company or the expected
benefits of the transaction); the failure to obtain shareholder approvals or to satisfy any of the other conditions to the transaction on a timely basis or at all; the possibility that the anticipated benefits of the transaction are not
realized when expected or at all, including as a result of the impact of, or problems arising from, the integration of the two companies or as a result of the strength of the economy and competitive factors in the areas where Huntington and
TCF do business; the possibility that the transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; diversion of management’s attention from ongoing business operations and
opportunities; potential adverse reactions or changes to business or employee relationships, including those resulting from the announcement or completion of the transaction; the ability to complete the transaction and integration of
Huntington and TCF successfully; the dilution caused by Huntington’s issuance of additional shares of its capital stock in connection with the transaction; and other factors that may affect the future results of Huntington and TCF.
Additional factors that could cause results to differ materially from those described above can be found in Huntington’s Annual Report on Form 10-K for the year ended December 31, 2019 and in its subsequent Quarterly Reports on Form 10-Q,
including for the quarter ended September 30, 2020, each of which is on file with the Securities and Exchange Commission (the “SEC”) and available in the “Investor Relations” section of Huntington’s website, http://www.huntington.com, under
the heading “Publications and Filings” and in other documents Huntington files with the SEC, and in TCF’s Annual Report on Form 10-K for the year ended December 31, 2019 and in its subsequent Quarterly Reports on Form 10-Q, including for the
quarter ended September 30, 2020, each of which is on file with the SEC and available on TCF’s investor relations website, ir.tcfbank.com, under the heading “Financial Information” and in other documents TCF files with the SEC.All
forward-looking statements speak only as of the date they are made and are based on information available at that time. Neither Huntington nor TCF assumes any obligation to update forward-looking statements to reflect circumstances or events
that occur after the date the forward-looking statements were made or to reflect the occurrence of unanticipated events except as required by federal securities laws. As forward-looking statements involve significant risks and uncertainties,
caution should be exercised against placing undue reliance on such statements.IMPORTANT ADDITIONAL INFORMATIONIn connection with the proposed transaction, Huntington will file with the SEC a Registration Statement on Form S-4 that will
include a Joint Proxy Statement of Huntington and TCF and a Prospectus of Huntington, as well as other relevant documents concerning the proposed transaction. The proposed transaction involving Huntington and TCF will be submitted to TCF’s
shareholders and Huntington’s shareholders for their consideration. This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, nor shall there be
any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. INVESTORS AND SHAREHOLDERS OF HUNTINGTON AND
SHAREHOLDERS OF TCF ARE URGED TO READ THE REGISTRATION STATEMENT AND THE JOINT PROXY STATEMENT/PROSPECTUS REGARDING THE TRANSACTION WHEN IT BECOMES AVAILABLE AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR
SUPPLEMENTS TO THOSE DOCUMENTS, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Shareholders will be able to obtain a free copy of the definitive joint proxy statement/prospectus, as well as other filings containing information about
Huntington and TCF, without charge, at the SEC’s website http://www.sec.gov. Copies of the joint proxy statement/prospectus and the filings with the SEC that will be incorporated by reference in the joint proxy statement/prospectus can also
be obtained, without charge, by directing a request to Huntington Investor Relations, Huntington Bancshares Incorporated, Huntington Center, HC0935, 41 South High Street, Columbus, Ohio 43287, (800) 576-5007 or to TCF Investor Relations, TCF
Financial Corporation, 333 W. Fort Street, Suite 1800, Detroit, Michigan 48226, (866) 258-1807.PARTICIPANTS IN THE SOLICITATIONHuntington, TCF, and certain of their respective directors and executive officers may be deemed to be participants
in the solicitation of proxies from the shareholders of Huntington and TCF in connection with the proposed transaction under the rules of the SEC. Information regarding Huntington’s directors and executive officers is available in its
definitive proxy statement relating to its 2020 Annual Meeting of Shareholders, which was filed with the SEC on March 12, 2020, and other documents filed by Huntington with the SEC. Information regarding TCF’s directors and executive
officers is available in its definitive proxy statement relating to its 2020 Annual Meeting of Shareholders, which was filed with the SEC on March 25, 2020, and other documents filed by TCF with the SEC. Other information regarding the
participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the joint proxy statement/prospectus and other relevant materials filed with the SEC.
Free copies of this document may be obtained as described in the preceding paragraph.USE OF NON-GAAP FINANCIAL MEASURESThis document contains GAAP financial measures and non-GAAP financial measures where management believes it to be helpful
in understanding Huntington’s results of operations or financial position. Where non-GAAP financial measures are used, the comparable GAAP financial measure, as well as the reconciliation to the comparable GAAP financial measure, can be found
in this document, conference call slides, or the Form 8-K related to this document, all of which can be found in the Investor Relations section of Huntington’s website, http://www.huntington.com. 2