3rd Quarter 2026 Earnings Conference Call Slides

The Company's accounting and reporting policies conform to U.S. generally accepted accounting principles ("GAAP") and general practices within the banking industry. As a supplement to GAAP, the Company provides non-GAAP performance results, which the Company believes are useful because they assist investors in assessing the Company's operating performance. 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 the appendix to this financial review.

The Company presents EPS, the efficiency ratio, return on average common equity, return on average tangible common equity, pre-provision net revenue and net income applicable to common shares, all adjusted for certain notable items. These items include a pension plan gain/loss, merger-related charges associated with completed and pending acquisitions, debt securities gains/losses, distribution of excess pension assets expense, FDIC special assessment expense, and CECL Day 1 non-PCD provision expense. Management believes excluding these items from EPS, the efficiency ratio, return on average common equity, and return on average tangible common equity may be useful in assessing the Company's underlying operational performance since these items do not pertain to its core business operations and their exclusion may facilitate better comparability between periods. Management believes that excluding merger-related charges from these metrics may be useful to the Company, as well as analysts and investors, since these expenses can vary significantly based on the size, type, and structure of each acquisition. Additionally, management believes excluding these items from these metrics may enhance comparability for peer comparison purposes.

The Company presents adjusted noninterest expense, which excludes merger-related charges associated with completed and pending acquisitions, distribution of excess pension assets expense, and FDIC special assessment expense, as well as adjusted noninterest income, which excludes a pension plan gain/loss and debt securities gains/losses. Management believes that excluding these items from noninterest expense and noninterest income may be useful in assessing the Company's underlying operational performance as these items either do not pertain to its core business operations or their exclusion may facilitate better comparability between periods and for peer comparison purposes.

The tax-equivalent adjustment to net interest income and net interest margin recognizes the income tax savings when comparing taxable and tax-exempt assets. Interest income and yields on tax-exempt securities and loans are presented using the current federal income tax rate of 21%. Management believes that it is standard practice in the banking industry to present net interest income and net interest margin on a fully tax-equivalent basis and that it may enhance comparability for peer comparison purposes.

In management's view, tangible common equity measures are capital adequacy metrics that may be meaningful to the Company, as well as analysts and investors, in assessing the Company's use of equity and in facilitating comparisons with peers. These non-GAAP measures are valuable indicators of a financial institution's capital strength since they eliminate intangible assets from stockholders' equity and retain the effect of accumulated other comprehensive loss in stockholders' equity.

Although intended to enhance investors' understanding of the Company's business and performance, these non-GAAP financial measures should not be considered an alternative to GAAP. In addition, these non-GAAP financial measures may differ from those used by other financial institutions to assess their business and performance. See the following reconciliations in the "Non-GAAP Reconciliations" section for details on the calculation of these measures to the extent presented herein.

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EARNINGS

• Record net income of $254 million

• EPS of $0.66 and record adjusted EPS1 of $0.66

• ROATCE1 of 19.6% and adjusted ROATCE1 of 19.6%

• ROAA1 of 1.37% and adjusted ROAA1 of 1.37%

• Record efficiency ratio1 of 46.1% and record

  adjusted efficiency ratio1 of 44.9%

  CREDIT

  Credit quality remains stable

• Criticized and classified loans down 9%

• Net charge-offs of 27 bps; 24 bps excluding PCD loans

• Delinquencies, nonaccrual loans and provision in normalized ranges

  CAPITAL

  Strong capital funding growth and shareholder returns

• CET1 of 11.11%, stable to 2Q26 while funding 3% annualized loan growth

• Repurchased $100 million, or 3.9 million shares, of common stock; $177 million authorization remaining

• Paid $55 million of quarterly common stock cash dividends

• TBV per share excluding the impact of a $391 million rate-driven decrease in AOCI, increased 13% annualized

1 Non-GAAP financial measure that management believes is useful in evaluating the financial results of the Company - see Appendix for Non-GAAP reconciliation 4

Re p o r t e d A d j u st e d 1

A d j u st e d 1

v s. 2 Q 2 6

K EY P ERFO RM A N CE D RI V ERS

Total loan2 growth of $362 million (3% annualized) - C&I up

$148 million (4% annualized) and CRE up $157 million (3% annualized)

• $3.0 billion of total commercial production - 86% floating at 5.9%

• Total commercial pipeline of $4.4 billion, up 6% YoY

  Total deposits up 11% annualized on higher business and public funds

• Total deposit costs of 179 bps and interest-bearing deposit costs of 231 bps, both up 8 bps

Record efficiency ratio1 of 46.1% and record adjusted efficiency ratio1 of 44.9%

$ in millions, except per share data 1 Non-GAAP financial measure that management believes is useful in evaluating the financial results of the Company - see Appendix

for Non-GAAP reconciliation 2 Includes loans held-for-sale 5

$ in millions, except per share data 1 Includes loans held-for-sale 2 3Q26 figures are preliminary 3 Non-GAAP financial measure that management believes is useful in

evaluating the financial results of the Company - see Appendix for Non-GAAP reconciliation 6

Total loans1 and loan yields

6.28%

5.88%

5.92%

$48,048 $50,816 $51,179

3Q25 2Q26 3Q26

Total securities2 and securities yields

$14,949 $15,083 $14,796

4.24%

4.11%

4.19%

3Q25 2Q26 3Q26

T O T A L LO A N S 1

• Total loan growth of $362 million, or 3% annualized; up 7% YoY

  • C&I loan growth of $148 million, or 4% annualized; up 12% YoY

  • CRE loan growth of $157 million, or 3% annualized; up 3% YoY

• $3.0 billion total commercial production - 86% floating at 5.9%

• $4.4 billion total commercial pipeline, up 6% YoY

• October 1, 2026 total loan portfolio spot yield of 6.0%

  SECU RI T I ES 2

• Duration3 of 4.7, compared to 4.1 for 2Q26

• 3Q26 new money yield of 5.4%

  • Current new money yields are ~6.0%

• Estimated next-twelve-month cash flows4 of

~$1.8 billion

LO A N 1 P O RT F O LI O M I X

CRE non-owner occupied 32%

C&I 32%

Residential real estate 17%

CRE owner occupied 12%

Consumer 7%

SECU RI T I ES 2 P O RT F O LI O M I X

All commercial mortgage-backed securities are agency-backed.

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$ in millions 1 End of period balances; includes loans held-for-sale. 2 End of period balances; includes available-for-sale securities, held-to-maturity securities, equity securities and FHLB/FRB stock. 3 Available-for-sale effective duration reflects available-for-sale effective duration including securities hedges. 4 Cash flows include principal and interest.

Deposits grew $1.5 billion, or 11% annualized; long-tenured and granular base with 22% noninterest-bearing

Period-end total deposits

CO ST & M I X

W H Y T H E B A SE I S D U RA B LE

$5.7

$5.0

$5.6

$25.1

$26.9

$27.8

$24.2

$24.2

$24.2

$55.0 $56.1 $57.6

Accounts under $25k; % of accounts ~80%

Total deposits; median balance ~$3,800

Core account balance, $0-$250k $17k

Peer2 average, $0-$250k $23k

3Q25 2Q26 3Q26

Core deposits with tenure >5 years ~75%

Top 20 clients / total deposits ~11%

Retail Commercial Public

Top 20 weighted average tenure ~13 years

Cost of total deposits vs. exception pricing1

2.99% 2.59% 2.57% 2.58%

1.97% 1.80% 1.72% 1.71% 1.79%

2.76%

Top 20 collateralized or insured >85%

Exception priced / total deposits ~37%

Exception priced, average rate1 2.76%

Deposit growth came from business and public funds.

3Q25 4Q25 1Q26 2Q26 3Q26

Cost of Deposits Exception Pricing1

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$ in billions unless otherwise stated. 1 Exception pricing shown at the weighted average rate at end of period. 2 Peer data per S&P Global Market Intelligence as of June 30, 2026; peer group defined in the Appendix.

9

$ in millions, except per-share data 1 Non-GAAP financial measures that management believes is useful in evaluating the financial results of the Company - see Appendix for Non-GAAP reconciliation 2 Fully Taxable Equivalent Basis 3 Includes the provision for credit losses on unfunded loan commitments 4 Includes a gain associated with the termination of the Bremer pension plan

Net interest income¹ increased as earning asset growth and favorable rate/volume mix more than offset higher deposit costs

Net interest income (FTE)1 and net interest margin1 M A RG I N B RI D G E · 2 Q 2 6 T O 3 Q 2 6

2Q26 net interest margin1 3.54%

$583 $586 $592

Rate / volume mix +4 bps

3.64%

3.54%

3.52%

Day count +2 bps

Interest-bearing deposit costs (8) bps

3Q26 net interest margin1 3.52%

W ELL- P O SI T I O N ED F O R RI SI N G RA T ES

3Q25 2Q26 3Q26

Net interest income (FTE) Net interest margin (FTE)

• Current spot rates favorable to NIM by ~2bps

• 63% of loans are variable or floating rate; 94% reprice within three months

• 86% of 3Q26 and 88% of YTD commercial production was floating rate

• ~$4.6 billion of fixed-rate loans with WAR of 5.1% and

  ~$1.8 billion of fixed-rate securities with WAR of 4.2% reprice over the next twelve months at September 30, 2026

• $3.4 billion of net balance sheet hedges protect downside risk

  10

  $ in millions. ¹ Fully Taxable Equivalent Basis; Non-GAAP financial measure that management believes is useful in evaluating the financial results of the Company; see Appendix for Non-GAAP reconciliation.

  Noninterest Income Bank and wealth fees remained resilient as other income normalized from elevated second quarter levels

  A D JU ST ED N O N I N T EREST I N CO M E 1

  Adjusted noninterest income¹

  3Q26 2Q26 3Q25

  Bank fees $43 $41 $41

  Wealth fees 42 42 40

  Mortgage fees 9 11 10

  Capital markets 12 12 13

  Other 22 34 26

  Adjusted noninterest income¹ $128 $140 $130

  $140

  $130 $128

  3Q25 2Q26 3Q26

  K EY P ERF O RM A N CE D RI V ERS

  Quarter-end mortgage pipeline

  $188M

  vs. $229M at 2Q26

$229 million for 2Q26

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$ in millions. ¹ Non-GAAP financial measure that management believes is useful in evaluating the financial results of the Company; see Appendix for Non-GAAP reconciliation.

A D JU ST ED N O N I N T EREST EX P EN SE 1

Adjusted noninterest expense¹

3Q26 2Q26 3Q25

Salaries & employee benefits $180 $183 $194

Occupancy & equipment 46 45 47

Technology & communication 34 36 41

Amortization of intangibles 23 24 26

Other 72 72 68

Adjusted noninterest expense¹ $355 $360 $376

$376 $360 $355

3Q25 2Q26 3Q26

K EY P ERF O RM A N CE D RI V ERS

• Disciplined expense management

• Record adjusted efficiency ratio¹ of 44.9%

• Continued to invest in organic growth during 3Q26; added 19 Commercial and 7 Wealth relationship managers

  • Opened new LPOs in Ohio (Cleveland and Columbus)

  • Enhanced leadership in 1834 and FX while adding new executives across several new strategic disciplines (FinTech/Food & Bev)

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$ in millions. ¹ Non-GAAP financial measure that management believes is useful in evaluating the financial results of the Company; see Appendix for Non-GAAP reconciliation.

Net charge-offs

% of average loans, annualized

0.25% 0.26% 0.27%

0.24%

30+ day delinquency and nonaccrual loans

% of total loans

1.23%

0.91%

0.92%

W H A T T H I S Q U A RT ER SH O W S

• Net charge-offs, delinquencies, nonaccrual loans and provision in normalized ranges

- Net charge-offs of 24 bps excluding the 3 bps impact of PCD loans

0.18%

0.29%

0.25%

0.22%

0.17%

3Q25 2Q26 3Q26

ONB Excluding PCD

3Q25 2Q26 3Q26

Nonaccrual Loans 30+ Day Delinquency

M O D EL A SSU M P T I O N S

• Multiple scenario weighted forecast

• Qualitative reserves are ~19% of total ACL

  A LLO W A N CE FO R CRED I T LO SSES 1 - Q o Q

  Allowance at 9/30/2026

  $612M

  1.20% of total loans2

A CQ U I SI T I O N A CCO U N T I N G

$ in millions. ¹ Includes reserve for unfunded commitments 2 Excludes loans held-for-sale 13

CET1 up 2 bps to 11.11% while funding earning asset growth and returning $155 million to shareholders

Tangible common book value per share1

+5% YoY · -15% annualized QoQ

3 Q 2 6 CA P I T A L D EP LO Y M EN T

$250 million of net income applicable to common shares

CA P I T A L RA T I O S 2

CET1 / RWA

11.11% 11.09% 11.02%

3Q26

2Q26

3Q25

$13.15

$14.32 $13.77

Share repurchases

3.9 million shares

$100M

Tier 1 / RWA 11.54%

Common dividends

Quarterly cash dividend

$55M

Total capital / RWA 13.59%

TCE / tangible assets 7.28%

11.53%

13.65%

7.68%

11.49%

12.78%

7.53%

Retained

Supports loan growth

$95M

3Q25 2Q26 3Q26

Combined payout ratio

62%

1 Non-GAAP financial measure that management believes is useful in evaluating the financial results of the Company - see Appendix for Non-GAAP reconciliation

2 3Q26 figures are preliminary

P O SI T I O N

• $177 million of repurchase authorization remaining

• Capital strength validated by internal stress testing

• HTM pre-tax unrealized losses of

  $559 million, or ~$419 million net of tax

• TBV per share excluding the impact of a

  $391 million rate-driven decrease in AOCI, increased 13% annualized

  14

  Full Year Outlook Outlook unchanged from prior quarter

  Full-year 2026 3Q26 Actual Prior 2026 Guidance Current 2026 Guidance

  End-of-period loans (including HFS) up 3% annualized

  (up 6% YTD, annualized)

  up 6%-8% YoY Unchanged

  Net interest income (FTE) $592 million ~$2,400 million ± 2% Unchanged

  Noninterest income $128 million ~$515-$525 million Unchanged

  Noninterest expense $355 million ~$1,435-$1,455 million 1

  Unchanged

  Net charge-off ratio 0.27 % ~0.25%-0.30% Unchanged

  Provision for credit losses $34 million ~$135-$145 million Unchanged

  Income tax rate - GAAP / adjusted FTE 22% / 23% ~22% / ~24% Unchanged

  Results in positive operating leverage and greater than 15% EPS growth year over year

  Net interest income drivers - we see more opportunities than headwinds in today's environment

  O P P O RT U N I T I ES

  • Fixed rate repricing

  • Strong loan growth outlook

  • Loan spread and asset mix opportunities

  • Current spot rates favorable to NIM by ~2 bps

    A SSU M P T I O N S

  • No Fed interest rate actions assumed in 4Q26

  • Deposit pricing remains competitive

  • Funding mix remains relatively stable

  • Includes investment in top revenue-generating talent

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$ in millions. Prior 2026 guidance as presented in the Company's 2Q26 earnings presentation. Net interest income (FTE), noninterest income and noninterest expense are non-GAAP financial measures; see the Appendix for reconciliations.

1 Includes investment in new revenue-generating talent

A $51.1 billion loan portfolio diversified by asset class and geography

Total loans

CRE non-owner occupied

$16.7 billion · 32% of total loans

T O T A L LO A N S B Y ST A T E

$51.1B

Multifamily

Other

Warehouse Industrial

Office Retail

CRE owner occupied

17%

17%

14%

11%

41%

$6.0 billion · 12% of total loans

Warehouse 8%

CRE owner occupied 12%

Consumer 7%

Senior Housing

Office

13%

12%

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$ in billions. As of September 30, 2026. Excludes loans held-for-sale. Summations may not equal due to rounding. CRE portfolio percentages shown as a share of total loans.

CRE Non-Owner Occupied Maturities

CRE non-owner occupied maturing <18 months

CRE non-owner occupied maturing <18 months -interest rate <4%

$0.7B

$4.9B

~1% of total loans

M A T U RI N G CRE N O N - O W N ER O CCU P I ED LO A N S

• Manageable volume of loans subject to refinance risk

• Predominantly multifamily; continues to experience stronger demand and rents

• ~1% of total loans that are CRE non-owner occupied mature within 18 months at <4% rate

• Loans underwritten at +300 bps over contractual rates at origination

As of September 30, 2026. 18

A $2.3 billion office portfolio of smaller, in-footprint loans with low CBD exposure

Our lending looks more like this …less like this

80% located in the bank's footprint and diversified by submarket. CBD office exposure is low and primarily within footprint, across 13 cities.

O F F I CE P O RT F O LI O

Total office portfolio $2.3B

Average loan size $4.1M

Located in bank's footprint 80%

MOB and/or investment grade tenants 60%

CBD share of NOO office 10%

Weighted average LTV ~62%

Weighted average DSC ~1.47x

As of September 30, 2026. 19

A $6.8 billion multifamily portfolio with stable demand and no material rent-controlled exposure

Our lending looks more like this …less like this

Stable demand and rental rates in core markets (IL, MN, WI). Multifamily remains the dominant and stable CRE asset class.

M U LT I F A M I LY P O RT F O LI O

Total multifamily portfolio $6.8B

Average loan size $5.5M

Located in bank's footprint 87%

Material rent-controlled exposure None

Weighted average LTV ~61%

Weighted average DSC ~1.34x

As of September 30, 2026. 20