OLD NATIONAL BANCORP /IN/

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

For the quarterly period ended September 30, 2026

or

For the transition period from ____________ to ____________

Commission File Number 001-15817

Old National Bancorp

(Exact name of registrant as specified in its charter)

(773) 765-7675

(Registrant’s telephone number, including area code)

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

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑ No☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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.☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐ No☑

The registrant has one class of common stock (no par value) with 378,258,000 shares outstanding at October 27, 2026.

FORM 10-Q

TABLE OF CONTENTS

GLOSSARY OF ABBREVIATIONS AND ACRONYMS

As used in this report, references to “Old National,” “the Company,” “we,” “our,” “us,” and similar terms refer to the consolidated entity consisting of Old National Bancorp and its wholly owned subsidiaries. Old National Bancorp refers solely to the parent holding company, and Old National Bank refers to Old National Bancorp’s bank subsidiary.

The acronyms and abbreviations identified below are used throughout this report, including the Notes to Consolidated Financial Statements (Unaudited). You may find it helpful to refer to this page as you read this report.

AOCI: accumulated other comprehensive income (loss)

AQR: asset quality rating

ASC: Accounting Standards Codification

ASU: Accounting Standards Update

ATM: automated teller machine

BBCC: business banking credit center (small business)

Bremer: Bremer Financial Corporation

CECL: current expected credit loss

Common Stock: Old National Bancorp common stock, no par value

DTI: debt-to-income

ESPP: Employee Stock Purchase Plan

FASB: Financial Accounting Standards Board

FDIC: Federal Deposit Insurance Corporation

FHLB: Federal Home Loan Bank

FHTC: Federal Historic Tax Credit

FICO: Fair Isaac Corporation

GAAP: U.S. generally accepted accounting principles

LGD: loss given default

LIHTC: Low Income Housing Tax Credit

N/A: not applicable

N/M: not meaningful

NASDAQ: NASDAQ Global Select Market

NMTC: New Markets Tax Credit

NOW: negotiable order of withdrawal

OCC: Office of the Comptroller of the Currency

PCD: purchased credit deteriorated

PD: probability of default

Preferred Stock: Old National Bancorp preferred stock

Renewable Energy: investment tax credits for solar projects

SEC: U.S. Securities and Exchange Commission

SOFR: Secured Overnight Financing Rate