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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): August 28, 2025 (August 27, 2025)

PINNACLE FINANCIAL PARTNERS, INC.
(Exact name of registrant as specified in charter)

Tennessee | 000-31225 | 62-1812853
(State or other jurisdiction of incorporation) | (Commission File Number) | (I.R.S. Employer Identification No.)

21 Platform Way South, Suite 2300, Nashville, Tennessee 37203
(Address of principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (615) 744-3700

N/A

(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☒ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Exchange Act:

Title of Each Class |  | Trading Symbol |  | Name of Exchange on which Registered
Common Stock par value $1.00 |  | PNFP |  | The Nasdaq Stock Market LLC
Depositary Shares (each representing a 1/40th interest in a share of 6.75% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series B) |  | PNFPP |  | The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01. | Regulation FD Disclosure.

On August 27, 2025, Pinnacle Financial Partners, Inc., a Tennessee corporation (“Pinnacle”), and Synovus Financial Corp., a Georgia corporation (“Synovus”), issued a joint investor presentation providing supplemental information regarding the previously announced business combination transaction between Pinnacle and Synovus. A copy of the joint investor presentation is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.
The information contained in Item 7.01 of this report, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section. The information contained in Item 7.01 of this report, including Exhibit 99.1, shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, whether made before, on, or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference to such filing.

Item 9.01 | Financial Statements and Exhibits.

(d) Exhibits

Exhibit No. |  | Description
99.1⸸ |  | Investor presentation of Pinnacle Financial Partners, Inc. and Synovus Financial Corp., dated August 27, 2025.
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL document).

⸸ | Furnished, not filed.

Forward-Looking Statements
This Current Report on Form 8-K contains statements that constitute “forward-looking statements” within the meaning of, and subject to the protections of, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical fact are forward-looking statements. These forward-looking statements include, but are not limited to, statements about the benefits of the proposed transaction between Pinnacle Financial Partners, Inc. (“Pinnacle”) and Synovus Financial Corp. (“Synovus”), including future financial and operating results (including the anticipated impact of the proposed transaction on Pinnacle’s and Synovus’ respective earnings and tangible book value), statements related to the expected timing of the completion of the proposed transaction, the combined company’s plans, objectives, expectations and intentions, and other statements that are not historical facts. You can identify these forward-looking statements through the use of words such as “believes,” “anticipates,” “expects,” “may,” “will,” “assumes,” “should,” “predicts,” “could,” “would,” “intends,” “targets,” “estimates,” “projects,” “plans,” “potential” and other similar words and expressions of the future or otherwise regarding the outlook for Pinnacle’s, Synovus’ or the combined company’s future businesses and financial performance and/or the performance of the banking industry and economy in general.

Prospective investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve known and unknown risks and uncertainties which may cause the actual results, performance or achievements of Pinnacle, Synovus or the combined company to be materially different from the future results, performance or achievements expressed or implied by such forward-looking statements. Forward-looking statements are based on the information known to, and current beliefs and expectations of, Pinnacle or Synovus and are subject to significant risks and uncertainties. Actual results may differ materially from those contemplated by such forward-looking statements. A number of factors could cause actual results to differ materially from those contemplated by the forward-looking statements in this Current Report on Form 8-K. Many of these factors are beyond Pinnacle’s, Synovus’ or the combined company’s ability to control or predict. These factors include, among others, (1) the risk that the cost savings and synergies from the proposed transaction may not be fully realized or may take longer than anticipated to be realized, (2) disruption to Pinnacle’s business and to Synovus’ business as a result of the announcement and pendency of the proposed transaction, (3) the risk that the integration of Pinnacle’s and Synovus’ respective businesses and operations will be materially delayed or will be more costly or difficult than expected, including as a result of unexpected factors or events, (4) the failure to obtain the necessary approvals by the shareholders of Pinnacle or Synovus, (5) the amount of the costs, fees, expenses and charges related to the transaction, (6) the ability by each of Pinnacle and Synovus to obtain required governmental approvals of the proposed transaction on the timeline expected, or at all, and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company after the closing of the proposed transaction or adversely affect the expected benefits of the proposed transaction, (7) reputational risk and the reaction of each company’s customers, suppliers, employees or other business partners to the proposed transaction, (8) the failure of the closing conditions in the merger agreement to be satisfied, or any unexpected delay in closing the proposed transaction or the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement, (9) the dilution caused by the issuance of shares of the combined company’s common stock in the transaction, (10) the possibility that the proposed transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events, (11) risks related to management and oversight of the expanded business and operations of the combined company following the closing of the proposed transaction, (12) the possibility the combined company is subject to additional regulatory requirements as a result of the proposed transaction or expansion of the combined company’s business operations following the proposed transaction, (13) the outcome of any legal or regulatory proceedings or governmental inquiries or investigations that may be currently pending or later instituted against Pinnacle, Synovus or the combined company and (14) general competitive, economic, political and market conditions and other factors that may affect future results of Pinnacle and Synovus including changes in asset quality and credit risk; the inability to sustain revenue and earnings growth; changes in interest rates and capital markets; inflation; customer borrowing, repayment, investment and deposit practices; the impact, extent and timing of technological changes; and capital management activities. Additional factors which could affect future results of Pinnacle and Synovus can be found in Pinnacle’s or Synovus’ filings with the Securities and Exchange Commission (the “SEC”), respectively, including in Pinnacle’s Annual Report on Form 10-K for the year ended December 31, 2024, under the captions “Forward-Looking Statements” and “Risk Factors,” and in Pinnacle’s Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, and Synovus’ Annual Report on Form 10-K for the year ended December 31, 2024, under the captions “Forward-Looking Statements” and “Risk Factors,” and Synovus’ Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. Undue reliance should not be placed on any forward-looking statements, which are based on current expectations and speak only as of the date that they are made. Pinnacle and Synovus do not assume any obligation to update any forward-looking statements as a result of new information, future developments or otherwise, except as otherwise may be required by law.
Important Information About the Merger and Where to Find It
Steel Newco Inc. (“Newco”) filed a registration statement on Form S-4 (File No. 333-289866) with the SEC on August 26, 2025 to register the shares of Newco common stock that will be issued to Pinnacle shareholders and Synovus shareholders in connection with the proposed transaction. The registration statement includes a joint proxy statement of Pinnacle and Synovus that also constitutes a prospectus of Newco. The definitive joint proxy statement/prospectus will be sent to the shareholders of each of Pinnacle and Synovus in connection with the proposed transaction. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT AND JOINT PROXY STATEMENT/PROSPECTUS WHEN THEY BECOME AVAILABLE (AND ANY OTHER DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE JOINT PROXY STATEMENT/PROSPECTUS) BECAUSE SUCH DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION REGARDING THE PROPOSED TRANSACTION AND RELATED MATTERS. Investors and security holders may obtain free copies of these documents and other documents filed with the SEC by Synovus, Pinnacle or Newco through the website maintained by the SEC at http://www.sec.gov or by contacting the investor relations department of Synovus or Pinnacle at:

Synovus Financial Corp. | Pinnacle Financial Partners, Inc.
33 West 14th Street | 21 Platform Way South
Columbus, GA 31901 | Nashville, TN 37203
Attention: Investor Relations | Attention: Investor Relations
InvestorRelations@synovus.com | investor.relations@pnfp.com
(706) 641-6500 | (615) 743-8219

Before making any voting or investment decision, investors and security holders of Synovus and Pinnacle are urged to read carefully the entire registration statement and joint proxy statement/prospectus when they become available, including any amendments thereto, because they will contain important information about the proposed transaction. Free copies of these documents may be obtained as described above.
Participants in Solicitation
Synovus and Pinnacle and their respective directors and executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies from Synovus’ shareholders and Pinnacle’s shareholders in respect of the proposed transaction under the rules of the SEC. Information regarding Synovus’ directors and executive officers is available in Synovus’ proxy statement for its 2025 annual meeting of shareholders, filed with the SEC on March 12, 2025 (and available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000018349/000001834925000057/syn-20250312.htm) (the “Synovus 2025 Proxy”), under the headings “Corporate Governance and Board Matters,” “Director Compensation,” “Proposal 1 Election of Directors,” “Executive Officers,” “Stock Ownership of Directors and Named Executive Officers,” “Executive Compensation,” “Compensation and Human Capital Committee Report,” “Summary Compensation Table,” and “Certain Relationships and Related Transactions,” and in Synovus’ Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on February 21, 2025 (and available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000018349/000001834925000049/syn-20241231.htm), and in other documents subsequently filed by Synovus with the SEC, which can be obtained free of charge through the website maintained by the SEC at http://www.sec.gov. Any changes in the holdings of Synovus’ securities by Synovus’ directors or executive officers from the amounts described in the Synovus 2025 Proxy have been or will be reflected on Initial Statements of Beneficial Ownership of Securities on Form 3 or on Statements of Change in Ownership on Form 4 filed with the SEC subsequent to the filing date of the Synovus 2025 Proxy and are available at the SEC’s website at www.sec.gov. Information regarding Pinnacle’s directors and executive officers is available in Pinnacle’s proxy statement for its 2025 annual meeting of shareholders, filed with the SEC on March 3, 2025 (and available at https://www.sec.gov/ix?doc=/Archives/edgar/data/1115055/000111505525000063/pnfp-20250303.htm) (the “Pinnacle 2025 Proxy”), under the headings “Environmental, Social and Corporate Governance,” “Proposal 1 Election of Directors,” “Information About Our Executive Officers,” “Executive Compensation,” “Security Ownership of Certain Beneficial Owners and Management,” and “Certain Relationships and Related Transactions,” and in Pinnacle’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on February 25, 2025 (and available at https://www.sec.gov/ix?doc=/Archives/edgar/data/1115055/000111505525000042/pnfp-20241231.htm), and in other documents subsequently filed by Pinnacle with the SEC, which can be obtained free of charge through the website maintained by the SEC at http://www.sec.gov. Any changes in the holdings of Pinnacle’s securities by Pinnacle’s directors or executive officers from the amounts described in the Pinnacle 2025 Proxy have been or will be reflected on Initial Statements of Beneficial Ownership of Securities on Form 3 or on Statements of Change in Ownership on Form 4 filed with the SEC subsequent to the filing date of the Pinnacle 2025 Proxy and are available at the SEC’s website at www.sec.gov. Additional information regarding the interests of such participants will be included in the joint proxy statement/prospectus and other relevant materials to be filed with the SEC.
No Offer or Solicitation
This Current Report on Form 8-K 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. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| PINNACLE FINANCIAL PARTNERS, INC.
| By: | /s/Harold R. Carpenter
| Name: | Harold R. Carpenter
| Title: | Executive Vice President and Chief Financial Officer
Date: August 28, 2025 |  |