8-K

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 18, 2022

1st Source Corporation

(Exact name of registrant as specified in its charter)

Indiana	0-6233	35-1068133
(State or other jurisdiction of incorporation)	(Commission File No.)	(I.R.S. Employer Identification No.)

100 North Michigan Street, South Bend, Indiana 46601

(Address of principal executive offices)     (Zip Code)

574-235-2000

(Registrant's telephone number, including area code)

Not Applicable

(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:

☐ 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 Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock - without par value	SRCE	The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. o

ITEM 7.01    Regulation FD Disclosure.

The executive officers of 1st Source Corporation intend to use the material filed herewith, in whole or in part, in one or more meetings with investors and analysts. A copy of the investor presentation is attached hereto as Exhibit 99.1.

1st Source Corporation does not intend for this Item 7.01 or Exhibit 99.1 to be treated as “filed” for purposes of the Securities Exchange Act of 1934, as amended, or incorporated into its filings under the Securities Act of 1933, as amended.

ITEM 9.01    Financial Statements and Exhibits.

The following exhibit shall not be deemed as “filed” for purposes of the Securities Exchange Act of 1934, as amended.

(d) Exhibit:

99.1	1st Source Corporation Investor Presentation
104	Cover Page Interactive Data File (Embedded within the InLine XBRL document).

SIGNATURE

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.

	1st SOURCE CORPORATION
	(Registrant)
Date: August 18, 2022	/s/ BRETT A. BAUER
	Brett A. Bauer
	Treasurer and Chief Financial Officer
	Principal Accounting Officer

EX-99.1

INVESTOR PRESENTATION 2nd Quarter 2022 NASDAQ: SRCE | www.1stsource.com

DISCLOSURES Forward-Looking Statements Except for historical information, the matters discussed may include “forward-looking statements.” Those statements are subject to material risks and uncertainties. 1st Source cautions readers not to place undue reliance on any forward-looking statements, which speak only as of the date made. The audience is advised that various important factors could cause 1st Source’s actual results or circumstances for future periods to differ materially from those anticipated or projected in such forward-looking statements. Please refer to our press releases, Form 10-Qs, and 10-Ks concerning factors that could cause actual results to differ materially from any forward-looking statements of which we undertake no obligation to publicly update or revise. Non-GAAP Financial Measures The accounting and reporting policies of 1st Source conform to generally accepted accounting principles (“GAAP”) in the United States and prevailing practices in the banking industry. However, certain non-GAAP performance measures are used by management to evaluate and measure the Company’s performance. Although these non-GAAP financial measures are frequently used by investors to evaluate a financial institution, they have limitations as analytical tools, and should not be considered in isolation, or as a substitute for analyses of results as reported under GAAP. These include taxable-equivalent net interest income (including its individual components), net interest margin (including its individual components), the efficiency ratio, tangible common equity-to-tangible assets ratio, pre-tax pre-provision income and tangible book value per common share. Management believes that these measures provide users of the Company’s financial information a more meaningful view of the performance of the interest-earning assets and interest- bearing liabilities and of the Company’s operating efficiency. Other financial holding companies may define or calculate these measures differently. See the slides titled “Reconciliation of Non-GAAP Financial Measures” for a reconciliation of certain non-GAAP financial measures used by the Company with their most closely related GAAP measures. 2page

CORPORATE OVERVIEW $8.0 billion Community Bank with International Reach headquartered in South Bend, Indiana Community Banking  Locations throughout northern Indiana and southwestern Michigan  Business and personal banking, payment services, lending, mortgage, and leasing  Investment management, wealth advisory, estate planning, and retirement planning services  Business and consumer insurance sales Renewable Energy Financing  National footprint  Construction loans, permanent loans and tax equity investments  Community solar, commercial and industrial, small utility scale, university and municipal projects Specialty Finance  National and international footprint  Construction machinery  Corporate and personal aircraft  Auto rental and leasing, shuttle buses, motor coaches, funeral cars, and step vans  Truck rental and leasing 3page

MISSION & VISION 4page Mission To help our clients achieve security, build wealth and realize their dreams by offering straight talk, sound advice and keeping their best interests in mind for the long-term. Vision  Offer our clients the highest quality service  Support a proud family of colleagues who personify the 1st Source spirit of partnership  Be the financial institution of choice in each market we serve  Remain independent and nurture pride of ownership among all 1st Source colleagues  Achieve long-term, superior financial results

MARKET AREA 5page Specialty Finance Loans & Leases $2.79 billion Community Bank Loans & Leases $2.80 billion

BUSINESS MIX Loans & Leases 6page COMMUNITY BANKING 50% SPECIALTY FINANCE 50% Business 76% Personal 24%

COMMUNITY BANKING 79 Banking Centers 98 Twenty-four-hour ATMs 9 Trust & Wealth Advisory locations with approximately $4.7 billion of assets under management 10 1st Source Insurance offices 7page In person OnlineOver the phone Mobile

8page RENEWABLE ENERGY FINANCING Our Renewable Energy Financing Division provides sponsors and developers with one-stop shop financing by providing construction loans, permanent loans, and tax equity investments to community solar, commercial & industrial, small utility scale, university, and municipal solar projects. Loans and investments are made across the contiguous United States, with a focus in the Northeast and Midwest. Financed solar projects positively impact communities across our growing portfolio through energy cost-savings and renewable energy generation. Environmental Impact The estimated aggregate power capacity of financed projects avoids 290,186 metric tons of carbon greenhouse emissions annually.* • Over $350 million in loans and leases outstanding as of June 30, 2022 • Over $106 million invested to date in tax equity partnership investments as of June 30, 2022 * Source: https://www.epa.gov/energy/greenhouse-gas-equivalencies-calculator as of August 8, 2022 Equivalent Emissions Avoided Annually* 32,652,908 28,505,539 321,064,900 3,842 36,553 56,463 1,602 671,843

SPECIALTY FINANCE GROUP Aircraft Division Aircraft division provides financing primarily for new and pre-owned general aviation aircraft (including helicopters) for private and corporate users, some for aircraft distributors and dealers, air charter operators, air cargo carriers, and other aircraft operators. See Appendix for NAICS industry detail. Construction Equipment Division Construction equipment division provides financing for infrastructure projects (i.e., asphalt and concrete plants, bulldozers, excavators, cranes, and loaders, etc.) Auto and Light Truck Division Auto/light truck division provides financing for automobile rental and leasing companies, light truck rental and leasing companies, and special purpose vehicle users: buses, funeral cars and step vans. Medium and Heavy Duty Truck Division The medium and heavy duty truck division finances highway tractors and trailers and delivery trucks for the commercial trucking industry and trash and recycling equipment for municipalities and private businesses as well as equipment for landfills. 9page

Zelle (P2P) HIGHLY RATED, FEATURE-RICH MOBILE APP Budget & Account Aggregation 54% 57% 62% 17% 16% 14% 29% 27% 24% 0% 25% 50% 75% 100% Q2 20 Q2 21 Q2 22 Digital Adoption¹ Mobile & Online Online Only Non-Digital 17% 21% 27% 26% 25% 23% 35% 34% 27% 21% 20% 23% 0% 25% 50% 75% 100% Q2 20 Q2 21 Q2 22 Service Usage³ 4+ 3 2 1 Other Services: Balance & Transfers, Pay Bills / eBills, Mobile Deposit, A2A Transfers 49.7 56.7 61.3 65.8 45.0 50.0 55.0 60.0 65.0 70.0 Q2 19 Q2 20 Q2 21 Q2 22 Mobile Users (000s)² Credit Score Mgmt.⁵ Debit Card Control Digital Wallet⁶ 3.6 30.7 51.3 81.2 0 25 50 75 100 Q2 19 Q2 20 Q2 21 Q2 22 Zelle Transactions (000s)⁴ 1 “Digital Adoption” is based on the primary deposit account holders’ usage of our online/mobile banking platforms 2 “Mobile Users” is based on activity within the Mobile App within the last 90 days 3 “Service Usage” are the number of distinct services (presented on the left) used by a digital user 4 Switched P2P service providers from PopMoney to Zelle in July 2019 5 Launched service in May 2022 6 1st Source Debit Cards can be loaded into Apple Pay, Samsung Pay & Google Wallet Apps page 10

AN EXPERIENCED AND PROVEN TEAM Executive Team 5 executives with an average 36 years each of banking experience and 26 years with 1st Source Business Banking Officers 39 business banking officers with an average 18 years each of lending experience and with 1st Source from 1 to 33 years Specialty Finance Group Officers 27 specialty finance officers with an average 25 years each of lending experience and with 1st Source from 1 to 31 years 11page

PERFORMANCE CLIENT Indiana SBA Community Lender Award 2013-2021 #1 Deposit share in our 16 contiguous county market #1 SBA Lender in our Indiana footprint #1 SBA Lender Headquartered in State of Indiana #22 On Monitor Magazine’s 2021 Top 50 Bank Finance/Leasing Companies in the U.S. #37 On Monitor Magazine’s 2022 Top 100 Largest Equipment Finance/Leasing Companies in the U.S. 12page

PERFORMANCE PEOPLE Forbes’ 150 Best Employers for Veterans 2021 Forbes’ 500 Best Midsize Employers 2021-2022 Forbes’ 500 Best Employers for Diversity 2022 Indianapolis Business Journal’s 250 Most Influential Business Leaders Christopher J. Murphy III CEO and Chairman of the Board Tracy D. Graham Board Member Isaac P. Torres Board Member 13page

FINANCIAL REVIEW

15page 4755 5000 5463 5438 5396 4.93% 5.16% 4.44% 4.32% 4.32% 3.75% 4.25% 4.75% 5.25% 5.75% 6.25% 2000 3500 5000 6500 2018 2019 2020 2021 2022 YTD Loans & Leases ($MM) Yield on Loans & Leases - FTE (%)* GROWING LOAN PORTFOLIO Total Average Loans & Leases * See “Reconciliation of non-GAAP Financial Measures” in Appendix. Note: Paycheck Protection Program loans have not been excluded from the totals above.

16page Commercial Real Estate 17% Residential Real Estate 9% Consumer 3% Medium and Heavy Duty Truck 5% Auto and Light Truck 12%Construction Equipment 14% Aircraft 17% Solar 6% Commercial and Agriculture 16% PPP Loans 1% DIVERSIFIED LOAN PORTFOLIO 2022 Average Loans by Type

17page PAYCHECK PROTECTION PROGRAM LOANS 2020 PPP Loans:  1,972 out of 3,540 loans for less than $50,000 (56%)  All loan amounts funded during 2020 have been forgiven by the SBA as of May 2, 2022 2021 PPP Loans:  2,424 out of 3,239 for less than $50,000 (75%)  Over 500 loans to minority-owned or woman-owned businesses  Almost 400 loans to new clients to Bank  Over 99% of total loan amounts funded during 2021 have been submitted to SBA for forgiveness as of June 30, 2022 (Dollars in thousands) Number of Loans $ of Loans Forgiveness/ Payments $ of Loans at June 30, 2022 2020 PPP Loans 3,540 $597,451 $596,996 $ 455 2021 PPP Loans 3,239 261,459 252,570 8,889 Total 6,779 $858,910 $849,566 $9,344 Highlights

18page 2.08% 2.19% 2.56% 2.38% 2.39% 2018 2019 2020 2021 2022 YTD STRONG CREDIT QUALITY % of Net Loans and Leases Loan & Lease Loss Allowance 0.71% 0.37% 1.16% 0.77% 0.60% 2018 2019 2020 2021 2022 YTD Low Nonperforming Assets 0.29% 0.10% 0.17% 0.16% -0.02% 2018 2019 2020 2021 2022 YTD Limited Losses Nonperforming Assets Net (Recoveries) Charge-Offs Solid Reserves

19page 4277 4502 5128 5987 6433 687 775 609 356 274 0.70% 0.96% 0.53% 0.19% 0.18% 0.00% 0.50% 1.00% 1.50% 2.00% 0 2,000 4,000 6,000 8,000 2018 2019 2020 2021 2022 YTD Core Deposits ($MM) Non-core Deposits ($MM) Effective Rate on Deposits (%) CORE DEPOSIT FRANCHISE TOTAL AVERAGE DEPOSITS *Non-core deposits include CDs over $250,000, brokered CDs, and national listing service CDs. 5277 5737 6343 6707 4964

20page Noninterest Bearing Demand 30% CD and IRA 13% Savings and Interest Bearing Demand 57% ATTRACTIVE DEPOSIT FRANCHISE 2022 Average Deposits By Type

21page $0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000 $6,000,000 $7,000,000 June 15 June 16 June 17 June 18 June 19 June 20 June 21 1st Source Chase Lake City Bank Horizon Bank Fifth Third DEPOSIT MARKET SHARE 16 COUNTY CONTIGUOUS MARKET* Leading Market Share in Community Banking Markets ($000) Data as of June 2021 – FDIC (via S&P Global Market Intelligence) *Includes Allen, DeKalb (added in June 2020), Elkhart, Fulton, Huntington, Kosciusko, LaPorte, Marshall, Porter, Pulaski, St. Joseph, Starke, Wells, and Whitley counties in the State of Indiana, and Berrien and Cass counties in the State of Michigan. 2021 ______13.81% ___________11.09% _10.02% _____5.35% ________4.77%

22page 82.4 92.0 81.4 118.5 58.3 56.73.16 3.57 3.17 4.70 2.29 2.28 $0.00 $1.00 $2.00 $3.00 $4.00 $5.00 $6.00 $0 $15 $30 $45 $60 $75 $90 $105 $120 $135 2018 2019 2020 2021 2021 YTD 2022 YTD Net Income ($MM) EPCS (Diluted) NET INCOME & EARNINGS PER SHARE

23page 124.5 136.0 142.3 150.6 75.8 78.1 $0 $35 $70 $105 $140 $175 2018 2019 2020 2021 2021 YTD 2022 YTD PRE-TAX, PRE-PROVISION INCOME ($MM) *See “Reconciliation of non-GAAP Financial Measures” in Appendix.

24page 1.08% 1.21% 1.34% 1.41% 1.14% 1.53% 1.42% 8.71% 9.69% 11.09% 11.50% 9.41% 13.07% 12.91% 9.98% 11.00% 12.50% 12.85% 10.42% 14.40% 14.26% 4.00% 8.00% 12.00% 16.00% 0.60% 1.20% 1.80% 2.40% 3.00% 2016 2017 2018 2019 2020 2021 2022 YTD R O AE a nd R O AT E R O AA Return on Average Assets Return on Average Common Equity Return on Average Tangible Common Equity** INCOME PERFORMANCE METRICS 1st SOURCE PERFORMS WELL AGAINST PEERS WHILE MAINTAINING STRONG CAPITAL LEVELS *Peer group data as of March 31, 2022. ** See “Reconciliation of non-GAAP Financial Measures” in Appendix. YTD Median Peer Data* National C&I Midwest ROATE 13.46% 14.70% ROAE 10.10% 11.42% ROAA 1.12% 1.31%

25page 214.7 224.6 226.4 237.1 114.6 123.33.73% 3.68% 3.39% 3.23% 3.25% 3.25% 2.00% 3.00% 4.00% 5.00% $0 $52 $104 $156 $208 $260 2018 2019 2020 2021 2021 YTD 2022 YTD Net Interest Income ($MM) Net Interest Margin (%) NET INTEREST MARGIN (FTE)* * See “Reconciliation of non-GAAP Financial Measures” in Appendix.

26page Trust, Wealth Advisory, and Retirement Plan Services 30% Other 16% Debit Card 22% Service Charges on Deposit Accounts 14% Insurance Commissions 9% Mortgage Banking 6% Equipment Rental 3% DIVERSE SOURCES OF NONINTEREST INCOME Fair Value of Assets Under Management of $4.7B * Note: Equipment rental income is shown net of leased equipment depreciation. See “Reconciliation of non-GAAP Financial Measures” in Appendix . Noninterest Income Composition 2022 YTD = $40.3MM* 25% of Total Revenue*

27page 160.2 163.9 167.2 172.5 82.0 85.3 56.2% 54.7% 54.2% 53.5% 51.9% 52.5% 40.0% 50.0% 60.0% 70.0% 80.0% $0.0 $50.0 $100.0 $150.0 $200.0 2018 2019 2020 2021 2021 YTD 2022 YTD Noninterest Expense ($MM)* Efficiency - Adjusted (%)* OPERATING EXPENSES * Note: Noninterest expense is shown net of leased equipment depreciation. See “Reconciliation of non-GAAP Financial Measures” in Appendix.

14.68% 14.90% 15.99% 16.76% 16.79% 2018 2019 2020 2021 2022 YTD 28page 12.06% 12.19% 12.15% 11.89% 12.21% 2018 2019 2020 2021 2022 YTD STRONG CAPITAL POSITION Tier 1 Leverage Ratio 13.42% 13.64% 14.73% 15.50% 15.53% 2018 2019 2020 2021 2022 YTD Tier 1 Risk Based Ratio Total Risk Based Capital Ratio Tangible Common Equity / Tangible Assets* 10.92% 11.38% 11.10% 10.39% 9.72% 2018 2019 2020 2021 2022 YTD 5% Well Capitalized 8% Well Capitalized 10% Well Capitalized * See “Reconciliation of non-GAAP Financial Measures” in Appendix. Note: YTD 2022, shares repurchased were 149,819 shares

29page $21.49 $22.75 $24.47 $26.30 $29.18 $31.62 $33.64 $31.33 $10.00 $15.00 $20.00 $25.00 $30.00 $35.00 $40.00 2015 2016 2017 2018 2019 2020 2021 2022 YTD TANGIBLE BOOK VALUE PER COMMON SHARE* Consistent Growth * See “Reconciliation of non-GAAP Financial Measures” in Appendix.

30page 0.600 0.618 0.645 0.671 0.720 0.760 0.960 1.100 1.130 1.210 0.940 $0.000 $0.200 $0.400 $0.600 $0.800 $1.000 $1.200 $1.400 $1.600 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 YTD COMMON DIVIDENDS PER SHARE 34 YEARS OF CONSECUTIVE DIVIDEND GROWTH

31page DELIVERING RETURNS TO SHAREHOLDERS Value of $100 Invested in 1st Source since 1971 Inception with Dividends Reinvested vs. Total Return of Stock Indices

32page DELIVERING RETURNS TO SHAREHOLDERS December 31, 2007 – August 3, 2022

PERFORMANCE FINANCIAL 2019-2022 KBW Bank Honor Roll Fourth consecutive year named among top 5% of banks with more than $500 million in total assets and ten consecutive years of increased earnings per share #26 Of 123 banks between $5 billion and $50 billion in assets – Bank Performance Scorecard by Bank Director Magazine 5-Star Superior Rating – BauerFinancial 34 Years of consecutive dividend growth 33page

INVESTMENT CONSIDERATIONS Consistent and superior financial performance with a focus on long-term earnings per share and tangible book value growth Experienced and proven team with significant investment in bank Diversification of product mix and geography with asset generation capability Leading market share in community banking markets Stable credit quality, strongly reserved Strong capital position and 34 consecutive years of dividend growth 34page

CONTACT INFORMATION Christopher J. Murphy III Chairman of the Board, CEO and President (574) 235-2711 Murphy-c@1stsource.com Brett A. Bauer CFO and Treasurer (574) 235-2638 bauerb@1stsource.com 35page

APPENDIX

CONSOLIDATED BALANCE SHEET 37page (Dollars in millions) 2018 2019 2020 2021 2022 YTD Cash and cash equivalents 99$ 83$ 243$ 525$ 282$ Investment securities and other investments 1,019 1,069 1,225 1,890 1,862 Loans and leases, net of unearned discount 4,847 5,106 5,502 5,360 5,557 Allowance for loan and lease losses (100) (111) (141) (127) (133) Equipment owned under operating leases, net 134 112 65 48 37 Other assets 295 364 422 400 424 Total assets 6,294$ 6,623$ 7,316$ 8,096$ 8,029$ Noninterest-bearing deposits 1,217$ 1,217$ 1,637$ 2,053$ 2,033$ Interest-bearing deposits 3,905 4,140 4,309 4,626 4,712 Total deposits 5,122 5,357 5,946 6,679 6,745 Total borrowings 329 276 291 330 275 Other liabilities 79 141 148 118 99 Total shareholders' equity 762 829 887 916 856 Noncontrolling interests 2 20 44 53 54 Total equity 764 849 931 969 910 Total liabilities and equity 6,294$ 6,623$ 7,316$ 8,096$ 8,029$

CONSOLIDATED INCOME STATEMENT 38page (Dollars in millions) 2018 2019 2020 2021 2021 YTD 2022 YTD Net interest income 214$ 224$ 226$ 237$ 114$ 123$ Provision for (recovery of) credit losses 19 16 36 (4) (1) 5 Noninterest income* 70 76 83 86 43 40 Noninterest expense* 160 164 167 172 82 85 Income before income taxes 105 120 106 155 76 73 Income tax expense 23 28 25 36 18 16 Net income 82 92 81 119 58 57 Net income attributable to noncontrolling interests - - - - - - Net income available to common shareholders 82$ 92$ 81$ 119$ 58$ 57$ Diluted net income per common share 3.16$ 3.57$ 3.17$ 4.70$ 2.29$ 2.28$ * Note: Noninterest income and Noninterest expense are shown net of leased equipment depreciation. See Reconciliation of non-GAAP Financial Measures" in Appendix.

39page Transportation & Warehousing 17% Finance & Insurance and Real Estate 16% Services 18% Retail Trade 10% Construction 11% Manufacturing 9% Ag, Forestry, Fishing & Hunting 9% Wholesale Trade 6% Other* 4% * Other includes: Mining & Utilities and Information AIRCRAFT PORTFOLIO INDUSTRIES BY NAICS

40page OWNERSHIP SUMMARY Institutional 10,730,808 43.5% Insiders 7,814,620 31.7% Retail/Other 5,340,800 21.7% 1st Source ESOP 764,179 3.1% Total Shares Outstanding(1) 24,650,407 100.0% Institution (Top 10 Institutions) Shares % of Total Dimensional Fund Advisors LP 1,677,326 6.8% BlackRock Inc. 1,299,429 5.3% Vanguard Group Inc. 795,591 3.2% AllianceBernstein LP 760,634 3.1% Wellington Management Group LLP 750,225 3.0% State Street Global Advisors Inc. 531,972 2.2% Manulife Asset Management 435,917 1.8% Boston Trust Walden Co. 370,031 1.5% Charles Schwab Investment Mgmt 326,761 1.3% Geode Capital Management LLC 308,279 1.2% Top 10 Institutions(2) 7,256,165 29.4% Other 3,474,643 14.1% Total Institutional Ownership(2) 10,730,808 43.5% Institutional 43.5% Insiders 31.7% Retail/Other 21.7% 1st Source ESOP 3.1% (1) As of June 30, 2022 (2) As of March 31, 2022 or most recently reported data Source: S&P Global Market Intelligence and Company filings

63% 33% 4% 41page ASSET LIABILITY MANAGEMENT Asset-sensitive posture Positioned for higher interest rates • Variable rate loans reprice quickly — 90% of Variable reprice within 3 months • Fixed rate loans have short terms — 2.6 year weighted average remaining life — High proportion of equipment lending • Stable, low-cost deposit funding base — 0.27% total deposit cost at June 30, 2022 — Deposit beta of 7% during the last rate hike cycle — 30% non-interest-bearing funds — 11.5-year average current depositor relationship • Liquid and high-quality investment portfolio of $1.9bn Net Interest Income Sensitivity 1 year difference versus no rate change +100 bps Parallel Ramp -100 bps Parallel Ramp +2.92% -3.74% +2.92% -3.74% LOANS Fixed 2.6 yr. weighted avg. remaining life Variable Repricing within 3 months Variable Repricing greater than 3 months

42page RECONCILIATION OF NON-GAAP FINANCIAL MEASURES Calculation of Yield on Loans and Leases (Dollars in thousands) 2018 2019 2020 2021 2022 YTD (A) Loans and leases interest income (GAAP) 234,083$ 257,738$ 242,172$ 234,583$ 115,504$ (B) Plus: loans and leases fully tax-equivalent adjustments 367 375 333 319 162 (C) Loans and leases interest income - FTE (A+B) 234,450 258,113 242,505 234,902 115,666 (D) Average loans and leases 4,755,256$ 5,000,161$ 5,463,436$ 5,437,817$ 5,396,472$ (E) Annualization factor 1.00 1.00 1.00 1.00 2.02 Yield on loans and leases (GAAP) (A*E)/D 4.92% 5.15% 4.43% 4.31% 4.32% Yield on loans and leases - FTE (C*E)/D 4.93% 5.16% 4.44% 4.32% 4.32% Pre-Tax, Pre-Provision Income (Dollars in thousands) 2018 2019 2020 2021 2021 YTD 2022 YTD (A) Income before income taxes (GAAP) 105,027$ 120,154$ 106,341$ 154,885$ 76,403$ 73,328$ (B) Plus: Provision (recovery of provision) for credit losses 19,462 15,833 36,001 (4,303) (627) 4,736 (C) Pre-tax pre-provision income (A+B) 124,489$ 135,987$ 142,342$ 150,582$ 75,776$ 78,064$ Calculation of Return on Average Tangible Common Equity (Dollars in thousands) 2016 2017 2018 2019 2020 2021 2022 YTD (A) Net income (GAAP) 57,786$ 68,051$ 82,414$ 91,960$ 81,437$ 118,534$ 56,704$ (B) 663,703 702,419 743,173 799,736 865,278 906,951 885,826 (C) Less: average goodwill and intangible assets 84,396 83,884 84,077 83,985 83,959 83,937 83,921 (D) Average tangible common shareholders' equity (B-C) 579,307$ 618,535$ 659,096$ 715,751$ 781,319$ 823,014$ 801,905$ (E) Annualization factor 1.00 1.00 1.00 1.00 1.00 1.00 2.02 Return on average common equity (GAAP) (A*E)/B 8.71% 9.69% 11.09% 11.50% 9.41% 13.07% 12.91% Return on average tangible common equity (A*E)/D 9.98% 11.00% 12.50% 12.85% 10.42% 14.40% 14.26% Average common shareholders' equity (GAAP)

43page RECONCILIATION OF NON-GAAP FINANCIAL MEASURES Calculation of Net Interest Margin (Dollars in thousands) 2018 2019 2020 2021 2021 YTD 2022 YTD (A) Interest income (GAAP) 257,316$ 282,877$ 263,031$ 254,772$ 124,062$ 130,078$ (B) Plus: fully tax-equivalent adjustments 803 686 543 459 239 231 (C) Interest income - FTE (A+B) 258,119 283,563 263,574 255,231 124,301 130,309 (D) Interest expense (GAAP) 43,410 59,011 37,211 18,134 9,715 6,998 (E) Net interest income (GAAP) (A-D) 213,906 223,866 225,820 236,638 114,347 123,080 (F) Net interest income - FTE (C-D) 214,709 224,552 226,363 237,097 114,586 123,311 (G) Average earning assets 5,761,761$ 6,104,673$ 6,684,246$ 7,338,639$ 7,113,559$ 7,653,120$ (H) Annualization factor 1.00 1.00 1.00 1.00 2.02 2.02 Net interest margin (GAAP) (E*H)/G 3.71% 3.67% 3.38% 3.22% 3.24% 3.24% Net interest margin - FTE (F*H)/G 3.73% 3.68% 3.39% 3.23% 3.25% 3.25% Noninterest Income (Dollars in thousands) 2018 2019 2020 2021 2021 YTD 2022 YTD (A) Noninterest income (GAAP) 97,050$ 101,130$ 103,889$ 100,092$ 50,767$ 45,975$ (B) Less: depreciation - leased equipment (26,248) (25,128) (20,203) (13,694) (7,323) (5,679) (C) Noninterest income - adjusted (A-B) 70,802$ 76,002$ 83,686$ 86,398$ 43,444$ 40,296$ Noninterest Expense (Dollars in thousands) 2018 2019 2020 2021 2021 YTD 2022 YTD (A) Noninterest expense (GAAP) 186,467$ 189,009$ 187,367$ 186,148$ 89,338$ 90,991$ (B) Less: depreciation - leased equipment (26,248) (25,128) (20,203) (13,694) (7,323) (5,679) (C) Noninterest expense - adjusted (A-B) 160,219$ 163,881$ 167,164$ 172,454$ 82,015$ 85,312$

44page RECONCILIATION OF NON-GAAP FINANCIAL MEASURES Calculation of Efficiency Ratio (Dollars in thousands) 2018 2019 2020 2021 2021 YTD 2022 YTD (A) Net interest income (GAAP) 213,906$ 223,866$ 225,820$ 236,638$ 114,347$ 123,080$ (B) Net interest income - FTE 214,709 224,552 226,363 237,097 114,586 123,311 (C) Plus: noninterest income (GAAP) 97,050 101,130 103,889 100,092 50,767 45,975 (D) Less: gains/losses on investment securities and partnership investments (320) (653) (1,652) (1,020) (112) (1,080) (E) Less: depreciation - leased equipment (26,248) (25,128) (20,203) (13,694) (7,323) (5,679) (F) Total net revenue (GAAP) (A+C) 310,956 324,996 329,709 336,730 165,114 169,055 (G) Total net revenue - adjusted (B+C-D-E) 285,191 299,901 308,397 322,475 157,918 162,527 (H) Noninterest expense (GAAP) 186,467 189,009 187,367 186,148 89,338 90,991 (E) Less: depreciation - leased equipment (26,248) (25,128) (20,203) (13,694) (7,323) (5,679) (I) Noninterest expense - adjusted (H-E) 160,219$ 163,881$ 167,164$ 172,454$ 82,015$ 85,312$ Efficiency ratio (GAAP-derived) (H/F) 60.0% 58.2% 56.8% 55.3% 54.1% 53.8% Efficiency ratio - adjusted (I/G) 56.2% 54.7% 54.2% 53.5% 51.9% 52.5% Calculation of Tangible Common Equity-to-Tangible Assets Ratio (Dollars in thousands) 2018 2019 2020 2021 2022 YTD (A) Total common shareholders' equity (GAAP) 762,082$ 828,277$ 886,845$ 916,255$ 856,251$ (B) Less: goodwill and intangible assets (83,998) (83,971) (83,948) (83,926) (83,916) (C) Total tangible common shareholders' equity (A-B) 678,084 744,306 802,897 832,329 772,335 (D) Total assets (GAAP) 6,293,745 6,622,776 7,316,411 8,096,289 8,029,359 (B) Less: goodwill and intangible assets (83,998) (83,971) (83,948) (83,926) (83,916) (E) Total tangible assets (D-B) 6,209,747$ 6,538,805$ 7,232,463$ 8,012,363$ 7,945,443$ Common equity-to-assets ratio (GAAP-derived) (A/D) 12.11% 12.51% 12.12% 11.32% 10.66% Tangible common equity-to-tangible assets ratio (C/E) 10.92% 11.38% 11.10% 10.39% 9.72%

45page RECONCILIATION OF NON-GAAP FINANCIAL MEASURES Calculation of Tangible Book Value per Common Share (Dollars in thousands, except for per share data) 2015 2016 2017 2018 2019 2020 2021 2022 YTD (A) Total common shareholders' equity (GAAP) 644,053$ 672,650$ 718,537$ 762,082$ 828,277$ 886,845$ 916,255$ 856,251$ (B) Less: goodwill and intangible assets (84,676) (84,102) (83,742) (83,998) (83,971) (83,948) (83,926) (83,916) (C) Total tangible common shareholders' equity (A-B) 559,377$ 588,548$ 634,795$ 678,084$ 744,306$ 802,897$ 832,329$ 772,335$ (D) Actual common shares outstanding 26,027,584 25,875,765 25,936,764 25,783,728 25,509,474 25,389,117 24,739,512 24,650,407 Book value per common share (GAAP-derived) (A/D)*1000 24.75$ 26.00$ 27.70$ 29.56$ 32.47$ 34.93$ 37.04$ 34.74$ Tangible common book value per share (C/D)*1000 21.49$ 22.75$ 24.47$ 26.30$ 29.18$ 31.62$ 33.64$ 31.33$

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Document and Entity Information	Aug. 18, 2022
Document and Entity Information
Document Type	8-K
Document Period End Date	Aug. 18, 2022
Entity Registrant Name	1st Source Corp
Entity Incorporation, State or Country Code	IN
Entity File Number	0-6233
Entity Tax Identification Number	35-1068133
Entity Address, Address Line One	100 North Michigan Street
Entity Address, City or Town	South Bend
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46601
City Area Code	574
Local Phone Number	235-2000
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Stock - without par value
Trading Symbol	SRCE
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false
Amendment Flag	false
Entity Central Index Key	0000034782