8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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):

November 7, 2018

Independent Bank Group, Inc.

(Exact Name of Registrant as Specified in Charter)

________________________

Texas	001-35854	13-4219346
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

1600 Redbud Boulevard, Suite 400

McKinney, TX 75069-3257

(Address of principal executive offices) (Zip code)

Registrant’s telephone number, including area code:

(972) 562-9004

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))

Indicate by checkmark whether the registrant is an emerging growth company 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 checkmark 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 November 7, 2018, officers of Independent Bank Group, Inc. (the “Company”) are presenting at the Sandler O'Neill East Coast Financial Services Conference. A copy of the materials for such presentation is attached as Exhibit 99.1.

In accordance with the General Instruction B.2 of Form 8-K, the information in this Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1 hereto, which is furnished herewith pursuant to and relates to this Item 7.01, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise be subject to the liabilities of Section 18 of the Exchange Act. The information in this Item 7.01 of this Current Report on Form 8-K and Exhibit 99.1 hereto shall not be incorporated by reference into any filing or other document filed by the Company with the SEC pursuant to the Securities Act of 1933, as amended, the rules and regulations of the SEC thereunder, the Exchange Act, or the rules and regulations of the SEC thereunder except as shall be expressly set forth by specific reference in such filing or document.

Item 9.01.    Financial Statements and Exhibits.

(d)    Exhibits.

The following exhibit is furnished as an exhibit to this Current Report on Form 8-K:

Exhibit No.	Description of Exhibit
Exhibit 99.1	Presentation materials for the Sandler O'Neill East Coast Financial Services Conference, dated November 7, 2018

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.

Dated November 7, 2018

INDEPENDENT BANK GROUP, INC.

By:	/s/ David R. Brooks
Name:	David R. Brooks
Title:	Chairman of the Board, Chief Executive Officer and President

EX-99.1

Exhibit 99.1 Sandler O'Neill East Coast Conference November 2018 David Brooks, Chairman, CEO and President Michelle Hickox, EVP and CFO RAISING STANDARDS TOGETHER

Safe Harbor Statement From time to time, our comments and releases may contain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 (the “Act”). Forward-looking statements can be identified by words such as “believes,” “anticipates,” “expects,” “forecast,” “guidance,” “intends,” “targeted,” “continue,” “remain,” “should,” “may,” “plans,” “estimates,” “will,” “will continue,” “will remain,” variations on such words or phrases, or similar references to future occurrences or events in future periods; however, such words are not the exclusive means of identifying such statements. Examples of forward-looking statements include, but are not limited to: (i) projections of revenues, expenses, income or loss, earnings or loss per share, and other financial items; (ii) statements of plans, objectives, and expectations of the Company or its management or Board of Directors; (iii) statements of future economic performance; and (iv) statements of assumptions underlying such statements. Forward-looking statements are based on the Company's current expectations and assumptions regarding its business, the economy, and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks, and changes in circumstances that are difficult to predict. The Company's actual results may differ materially from those contemplated by the forward-looking statements, which are neither statements of historical fact nor guarantees or assurances of future performance. Many possible events or factors could affect our future financial results and performance and could cause such results or performance to differ materially from those expressed in forward looking statements. These factors include, but are not limited to, the following: (1) the Company’s ability to sustain its current internal growth rate and total growth rate; (2) changes in geopolitical, business and economic events, occurrences and conditions, including changes in rates of inflation or deflation, nationally, regionally and in the Company’s target markets, particularly in Texas and Colorado; (3) worsening business and economic conditions nationally, regionally and in the Company’s target markets, particularly in Texas and Colorado, and the geographic areas in those states in which the Company operates; (4) the Company’s dependence on its management team and its ability to attract, motivate and retain qualified personnel; (5) the concentration of the Company’s business within its geographic areas of operation in Texas and Colorado; (6) changes in asset quality, including increases in default rates and loans and higher levels of nonperforming loans and loan charge-offs; (7) concentration of the loan portfolio of Independent Bank, before and after the completion of acquisitions of financial institutions, in commercial and residential real estate loans and changes in the prices, values and sales volumes of commercial and residential real estate; (8) the ability of Independent Bank to make loans with acceptable net interest margins and levels of risk of repayment and to otherwise invest in assets at acceptable yields and presenting acceptable investment risks; (9) inaccuracy of the assumptions and estimates that the managements of Independent Bank and the financial institutions that it acquires make in establishing reserves for probable loan losses and other estimates; (10) lack of liquidity, including as a result of a reduction in the amount of sources of liquidity, that the Company currently has; (11) material increases or decreases in the amount of deposits held by Independent Bank or other financial institutions that the Company acquires and the cost of those deposits; (12) the Company’s access to the debt and equity markets and the overall cost of funding its operations; (13) regulatory requirements to maintain minimum capital levels or maintenance of capital at levels sufficient to support the Company’s anticipated growth; (14) changes in market interest rates that affect the pricing of the loans and deposits of each of Independent Bank and the financial institutions that the Company acquires and the net interest income of each of Independent Bank and the financial institutions that the Company acquires; (15) fluctuations in the market value and liquidity of the securities the Company holds for sale, including as a result of changes in market interest rates; (16) effects of competition from a wide variety of local, regional, national and other providers of financial, investment and insurance services; (17) the institution and outcome of, and costs associated with, litigation and other legal proceedings against one of more of the Company, Independent Bank and financial institutions that the Company acquires or to which any of such entities is subject; (18) the occurrence of market conditions adversely affecting the financial industry generally; (19) the impact of recent and future legislative and regulatory changes, including changes in banking, securities and tax laws and regulations and their application by the Company’s regulators, and changes in federal government policies; (20) changes in accounting policies and practices, as may be adopted by the bank regulatory agencies, the Financial Accounting Standards Board, the SEC and the Public Company Accounting Oversight Board, or PCAOB, as the case may be; (21) governmental monetary and fiscal policies; (22) changes in the scope and cost of FDIC insurance and other coverage; (23) the effects of war or other conflicts, acts of terrorism (including cyber attacks) or other catastrophic events, including storms, droughts, tornadoes, hurricanes and flooding, that may affect general economic conditions; (24) the Company’s actual cost savings resulting from previous or future acquisitions are less than expected, it is unable to realize those cost savings as soon as expected, or it incurs additional or unexpected costs; (25) the Company’s revenues after previous or future acquisitions are less than expected; (26) the liquidity of, and changes in the amounts and sources of liquidity available to, us, before and after the acquisition of any financial institutions that the Company acquires; (27) deposit attrition, operating costs, customer loss and business disruption before and after the Company’s completed acquisitions, including, without limitation, difficulties in maintaining relationships with employees, may be greater than the Company expected; (28) the effects of the combination of the operations of financial institutions that the Company acquired in the recent past or may acquire in the future with the Company’s operations and the operations of Independent Bank, the effects of the integration of such operations being unsuccessful, and the effects of such integration being more difficult, time-consuming or costly than expected or not yielding the cost savings that the Company expects; (29) the impact of investments that the Company or Independent Bank may have made or may make and the changes in the value of those investments; (30) the quality of the assets of financial institutions and companies that the Company has acquired in the recent past or may acquire in the future being different than the Company determined or determine in its due diligence investigation in connection with the acquisition of such financial institutions and any inadequacy of loan loss reserves relating to, and exposure to unrecoverable losses on, loans acquired; (31) the Company’s ability to continue to identify acquisition targets and successfully acquire desirable financial institutions to sustain its growth, to expand its presence in its markets and to enter new markets; (32) technology-related changes are harder to make or are more expensive than expected; (33) attacks on the security of, and breaches of, the Company or Independent Bank’s digital information systems, the costs the Company or Independent Bank incur to provide security against such attacks and any costs and liability the Company or Independent Bank incurs in connection with any breach of those systems; (34) the potential impact of technology and “FinTech” entities on the banking industry generally; (35) our success at managing the risks involved in the foregoing items; and (36) the other factors that are described in the Company’s Annual Report on Form 10-K filed on February 27, 2018, under the heading “Risk Factors”, and other reports and statements filed by the Company with the SEC. Any forward-looking statement made by the Company in this release speaks only as of the date on which it is made. Factors or events that could cause the Company’s actual results to differ may emerge from time to time, and it is not possible for the Company to predict all of them. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law. 2

Company Snapshot Overview Branch Map as of September 30, 2018 • Headquartered in McKinney, Texas DFW Metropolitan Colorado • 100+ years of operating history • 73 banking offices • Dallas-Fort Worth metropolitan area • Greater Austin area • Houston metropolitan area • Colorado Front Range area • Acquired seven financial institutions, adding $5.7 billion in assets, since IPO in 2013 • Eighth largest bank by deposits headquartered in Texas Financial Highlights as of and for the Quarter Ended September 30, 2018 Balance Sheet Highlights ($ in millions) Total Assets $ 9,891 Total Loans Held for Investment 7,704 Total Deposits 7,783 Greater Austin Houston Metropolitan Equity 1,567 Asset Quality Nonperforming Asset Ratio 0.16% Nonperforming Loans to Total Loans Held for Investment (1) 0.14 Net Charge-off Ratio (annualized) 0.14 Capital Ratios Tier 1 Risk Based 10.20% Total Risk Based 12.38 Tangible Common Equity to Tangible Assets (2) 8.76 Profitability Net Income $ 35.7 Adjusted Net Interest Margin (2) 3.89% Adjusted Efficiency Ratio (2) 49.77 Adjusted Return on Average Assets (2) 1.45 (1) Excludes mortgage warehouse purchase loans (2) Non-GAAP financial measure. See Appendix for reconciliation. 3

Third Quarter Key Highlights • Adjusted (non-GAAP) net income was $36.6 million, or $1.20 per diluted share, compared to $32.2 million, or $1.11 per diluted share, for second quarter2018 • Net interest income increased 9.3% compared to second quarter 2018 • Adjusted (non-GAAP) return on average assets and return on average equity increased to 1.45% and 9.34%, respectively • Continued strong credit quality metrics with nonperforming assets of 0.16% • Successfully completed the operational conversion of Integrity Bank 4

Third Quarter Selected Financial Data ($ in thousands except per share data) As of and for the Quarter Ended September 30, September 30, Linked Quarter Balance Sheet Data 2018 June 30, 2018 2017 Change Annual Change Total assets $ 9,891,464 $ 10,017,037 $ 8,891,114 (1.3)% 11.3% Loans held for investment (gross, excluding mortgage warehouse purchase loans) 7,554,124 7,479,977 6,226,343 1.0 21.3 Mortgage warehouse purchase loans 150,267 164,790 138,561 (8.8) 8.4 Total deposits 7,782,852 7,533,405 6,872,631 3.3 13.2 Total borrowings (excluding junior subordinated debentures) 482,207 887,724 683,492 (45.7) (29.4) Total stockholders' equity 1,567,184 1,538,269 1,281,460 1.9 22.3 Earnings and Profitability Data Net interest income $ 86,268 $ 78,909 $ 72,857 9.3% 18.4% Net interest margin 3.94% 3.97% 3.85% (0.8) 2.3 Non-interest income $ 12,749 $ 10,133 $ 12,130 25.8 5.1 Non-interest expense 52,655 49,158 47,904 7.1 9.9 Net income (1) 35,696 29,635 23,514 20.5 51.8 Basic EPS 1.17 1.02 0.85 14.7 37.6 Diluted EPS 1.17 1.02 0.84 14.7 39.3 Adjusted net interest margin (2) 3.89% 3.93% 3.80% (1.0) 2.4 Adjusted net income (2) $ 36,593 $ 32,239 $ 24,829 13.5 47.4 Adjusted basic EPS (2) 1.20 1.11 0.89 8.1 34.8 Adjusted diluted EPS (2) 1.20 1.11 0.89 8.1 34.8 Return on average assets 1.41% 1.30% 1.07% 8.5 31.8 Adjusted return on average assets (2) 1.45 1.41 1.13 2.8 28.3 (1) Effective January 1, 2018, the Tax Cuts and Jobs Act (TCJA) reduced the corporate U.S. statutory tax rate from 35% to 21%. (2) See Appendix for non-GAAP reconciliation 5

Among Strongest Economies in USA Texas • Texas ranks #3 for Fortune 500 companies with 48 companies headquartered in Texas (2018) • Forbes list Texas #2 as best state for business and #1 in economic climate (2017) • Second fastest economic growth • Headquarters to 100 of the 1,000 largest public and private companies in the United States • Population - 28.7 million, 2nd largest State (2018) • Third fastest-growing state with a growth rate of 1.80% in 2018 • Projected household income growth of 9.51% through 2023 versus 8.86% for the Nation (2018) • Texas unemployment rate of 3.8% (September 2018) • Home to six top universities and eleven professional sports teams • U.S. News ranks four of the major metro areas in their top 30 in the 100 Best Places to Live in the USA 2018 (#1) Austin (#14) San Antonio (#18) Dallas-Fort Worth (#26) Houston • Three out of four of Texas’ major metro areas were ranked in the top 15 on Forbes’ The Best Big Cities For Jobs 2018. (May 2018) (#1) Dallas (#2) Austin (#13) San Antonio • Dallas was ranked #6 and Austin was ranked #8 on Forbes’ The Best Places For Business and Careers. (October 2018) Colorado • Forbes list Colorado #8 as best state for business and #3 in economic climate (2017) • Colorado is expected to have the second fastest job growth over the next five years per EMSI data. • Population - 5.7 million, 21st largest State (2018) • Second fastest-growing state with a growth rate of 1.85% in 2018 • Projected household income growth of 9.54% through 2023 versus 8.86% for the Nation (2018) • Colorado unemployment rate of 3.1% which is more favorable to United States at 3.7% (September 2018) • Home to six top universities and five professional sports teams • U.S. News ranks two of the major metro areas in their top 30 in the 100 Best Places to Live in the USA 2018 (#2) Colorado Springs (#3) Denver • Colorado consistently ranks among the top five states for business • High levels of education are a key factor in the booming growth of the area's economy and workforce. • Denver was ranked #4 and Colorado Springs was ranked #12 on Forbes’ The Best Places For Business and Careers. (October 2018) Source: S&P Global Market Intelligence, Fortune, Forbes, World Population Review, Texas Wide Open Spaces, U.S. Census Bureau, Bureau of Labor Statistics, Dallas Office of Economic Development, Dallas Chamber of Commerce, Austin Chamber of Commerce, Greater Houston Partnership, Denver.org., Choose Colorado, Select Georgia, Denver 6 Post, U.S. News

Market Highlights IBTX operates in five of the top twenty The Best Places For DFW Metroplex/North Texas Region • The fourth largest metropolitan area and fastest growing in Business And Careers (Forbes.com, 2018 Ranking) the United States (2018) (#4) Denver ◦ Ranked 7th in strongest U.S. MSA (2018) (#6) Dallas ◦ Employment up 3.2% compared to 1.7% for U.S. (#8) Austin (August 2018) ◦ Ranked 2nd in number of jobs added over the year (#12) Colorado Springs and 3rd in annual rate of job growth (#21) Fort Collins Austin/Central Texas Region • Austin is the 11th largest city in the United States Metropolitan Statistical Area IBTX # of Total st Market IBTX Population (1) ◦ Ranked 1 in the strongest U.S. MSA (2018) Rank Branches • Headquarters to several public high tech companies 2018 2018 Houston Region Dallas-Fort Worth-Arlington, TX 10 37 7,575,979 • The fourth fastest growing MSA in the U.S. (2018) ◦ 4th largest city in the U.S. and the largest in Texas Houston-The Woodlands-Sugar Land, TX 20 14 7,092,836 (2018) Austin-Round Rock, TX 11 6 2,187,161 ◦ Employment up 3.7% compared to 1.7% for U.S. Sherman-Denison, TX 3 6 132,322 (August 2018) Waco, TX 11 2 274,601 Denver Colorado Springs, CO 13 4 741,407 • The 13th fastest growing MSA in the U.S. (2018) Denver-Aurora-Lakewood, CO 44 2 2,959,584 • 21st most populous city in the United States Greeley, CO 21 1 315,106 • Ranked 10th in strongest U.S. MSA (2018) Fort Collins, CO 23 1 353,332 • Annual population growth of 1.9% per year since 2010 Total 73 21,632,328 Colorado Springs • Home to the largest Military base in Colorado • 2nd largest city in Colorado Greeley • Ranked 9th in job growth for Mid-Sized Metro in U.S (2018) • Annual population growth of 2.1% per year since 2010 Fort Collins • Ranked 4th in job growth for Mid-Sized Metro in U.S (2018) • The 4th largest city in Colorado • Ranked 19th in Forbes Job Growth and 21st in Best Places for Business and Careers (2018) Source: S&P Global Market Intelligence, World Population Review, Forbes, Dallas.org, U.S. Census Bureau, Bureau of Labor Statistics, Bureau of Economic Analysis, Austin Chamber of Commerce, Greater Houston Partnership, Denver.org., Choose Colorado, Denver Post, U.S. News, Dallas news, Houston .org, Policom Corporation, newgeography.com, Memphisinvest.com, Hfflp.com, Business Facilities 7 (1) Population data from S&P Global Market Intelligence as of June 2018

History of Growth – Total Assets Guaranty Bancorp Total Assets - $3,811M (Dollars in Millions) Integrity Bancshares Organic CAGR of ~20% since 2011(1) Total Assets - $852M $15,000 Total CAGR of ~43% since 2011(1) $13,702 $12,000 Carlile Bancshares Live Oak Financial $3,776 Total Assets - Total Assets - $122M $2,193M BOH Holdings Total Assets - $1,040M $852 $8,684 $9,000 Houston City I Bank Holding Grand Bank Company Bancshares Total Assets - $329M Total Assets - $592M Total Assets - $158M $2,193 Community Group Total Assets - $105M $5,853 $6,000 $5,055 Collin Bank $4,133 $592 Total Assets - $173M $1,491 $3,000 $2,164 $1,740 $173 $262 $0 2012 2013 2014 2015 2016 2017 9/30/18 IBTX IPO: 4/3/2013 Annual Acquired Assets Pending Acquisition Note: Acquired assets excludes impact of purchase accounting (1) CAGR basis of $1.254 billion as of December 31, 2011 8 Source: S&P Global Market Intelligence

Focused on Delivering Shareholder Value Earnings Per Share and Adjusted Earnings Per Share Trends (diluted) (1) Effective January 1, 2018, the TCJA reduced the corporate U.S. statutory tax rate from 35% to 21%. The quarter ended December 31, 2017, includes a $5,528 charge to remeasure deferred taxes as a result of the enactment of the tax reform. 9 (2) See Appendix for non-GAAP reconciliation

Historical Profitability Interest Income, Net Interest Income and NIM ($ in millions) Adjusted Efficiency Ratio Trends (1) ($ in millions) (1) See Appendix for non-GAAP reconciliation 10

Deposit Mix and Pricing Deposit Mix as of September 30, 2018 Deposit Growth versus Average Rate ($ in millions) 2018 YTD Average Rate for Interest-bearing deposits: 1.05% (1) Average rate for total deposits 11

Loan Portfolio Composition Loan Composition at 09/30/2018 CRE Loan Composition at 09/30/2018 Loans by Region at 09/30/2018 2018 YTD adjusted loan yield: 5.20% (1) (1) Non-GAAP financial measure. Excludes $2,744 of income recognized on acquired loans. 12

Commercial Real Estate (CRE) and Construction and Development (C&D) CRE and C&D Concentrations at 09/30/2018 Retail CRE and C&D Composition at 09/30/2018 Loans > $500 thousand (1) • 737 Retail Loans (1) • 48 Loans > $5MM (1) (1) Excludes Integrity loans 13

Energy Lending Outstanding Balances and Related Reserves ($ in millions) 14

Historically Strong Credit Culture NPLs / Loans NCOs / Average Loans Note: Financial data as of and for the years ended December 31, and as of the six months ended June 30, 2018 for peer data and for the nine months ended September 30, 2018 for IBTX. Interim charge-off data annualized. 15 Source: U.S. and Texas Commercial Bank numbers from S&P Global Market Intelligence.

Capital Total Capital, Tier 1 and TCE/TA Ratios (1) See Appendix for non-GAAP reconciliation 16

Overview of Guaranty Bancorp (GBNK) (1) • Denver, Colorado headquartered bank established in 1955 Financial Summary and Nasdaq listed in 2005, with 32 branches strategically Balance Sheet Data located along the Front Range, including 14 in the Denver Total Assets ($M) 3,810.5 MSA Total Loans Held for Investment ($M) 2,929.4 • Largest bank operating exclusively in Colorado and the Total Deposits ($M) 3,059.9 fourth largest bank headquartered in the state – ranks Loans to Deposits (%) 95.7 second in Colorado deposit market share among banks headquartered in the state Regulatory Capital • High quality, committed management team and experienced, Tangible Common Equity ($M) 412.4 customer focused lenders Tang. Common Equity / Tang. Assets (%) 9.2 • Strong profitability metrics – core ROAA over 1.20% Total Risk Based Capital Ratio (%) 13.7 • Attractive funding base – over 30% noninterest bearing Profitability Data (LTM) deposits, with a cost of deposits of approximately 30 basis Adjusted Net Income ($M)(2) 51.3 points Adjusted Return on Average Assets (%)(2) 1.39 (2) • Conservative credit culture – five year average net charge- Adjusted Return on Average Equity (%) 12.5 offs to average loans from 2013 to 2017 of 0.05% vs. U.S. Net Interest Margin (%) 3.84 commercial bank industry aggregate of 0.51% Efficiency Ratio 50.7 • Sizable wealth management platform with approximately $1.5 billion in assets under management – provides Asset Quality opportunity for augmentation and scale in Texas metro Nonperforming Assets to Assets (%)(3) 0.15 markets Net Charge-offs to Average Loans (%) 0.01 Source: S&P Global Market Intelligence (1) Data as of and for the last twelve months ended September 30, 2018 (2) LTM net income reflects adjustment for one-time deferred tax asset revaluation associated with tax legislation of $976 thousand 17 (3) Excludes performing restructured loans

Transaction Summary Guaranty Bancorp (“GBNK”) and bank subsidiary, Merger Partner Guaranty Bank and Trust Company Transaction Value(1) $1.0 billion in aggregate, or $35.37 per share Consideration Mix 100% stock 0.45 IBTX common shares for each share of GBNK common stock, which equates to 13,189,494 Fixed Exchange Ratio shares of IBTX common stock based on the number of shares of GBNK common stock outstanding as of May 21, 2018 Pro Forma Ownership 70% IBTX / 30% GBNK Paul Taylor (President & CEO of GBNK) and Ed Cordes (Chairman of GBNK) to join IBTX Board of Additions to Directors Management / Board Michael Hobbs (President of Guaranty Bank and Trust Company) to serve as Colorado Market CEO for IBTX Required Approvals IBTX and GBNK shareholders, as well as customary regulatory approvals Fourth quarter of 2018, subject to regulatory and shareholder approvals and other customary closing Anticipated Closing conditions (1) Based on an IBTX closing price of $78.60 on May 21, 2018 18

Significant Scale Along the Front Range Pro Forma Colorado Deposit Market Share Pro Forma Colorado Footprint 2018 2018 2018 CO 2018 Deposits Market Rank HQ Institution Branches ($M) Share (%) 1 Wells Fargo & Co. 154 31,402 22.92 2 U.S. Bancorp 152 16,359 11.94 3 * FirstBank Holding Co. 99 15,618 11.40 4 JPMorgan Chase & Co. 115 14,160 10.34 5 BNP Paribas 75 4,729 3.45 6 KeyCorp 58 4,246 3.10 7 BOK Financial Corp. 23 3,810 2.78 Pro Forma 40 3,238 2.36 8 * Guaranty Bancorp 32 2,971 2.17 9 * Alpine Banks of Colorado 42 3,146 2.30 10 Pinnacle Bancorp Inc. 43 2,907 2.12 11 Lauritzen Corp. 26 2,804 2.05 12 Zions Bancorp. NA 37 2,794 2.04 13 BBVA 37 2,304 1.68 14 Bank of America Corp. 11 2,006 1.46 15 * National Bank Holdings Corp. 50 1,959 1.43 35 Independent Bk Group Inc. 8 267 0.20 GBNK (32) Top 15 Institutions 954 111,215 81.19 Total For Institutions In Market 1,462 136,980 100.00 IBTX (8) Source: S&P Global Market Intelligence Note: Reflects FDIC deposit data as of June 30, 2018; pro forma for pending acquisitions 19

Attractive Metropolitan Colorado Markets Five Year Projected Population Growth • Demographically attractive markets 8.9% • The Denver MSA is the largest in the state, with a 8.1% 7.7% population of approximately 2.9 million 6.8% 6.9% 7.1% – Ranked fourth among “The Best Places for Business and Careers,” according to Forbes 3.5% – Home to 10 Fortune 500 companies • Greeley was the third fastest growing metropolitan area in the country in 2017, according to the Greeley Greeley Fort Collins Denver Boulder Colorado Texas Nationwide Economic Development Council MSA MSA MSA MSA Five Year Projected Median Household Income Growth • Fort Collins is recognized as the business center of Northern Colorado and hosts manufacturing facilities 16.8% for major corporations including Anheuser-Bush, Broadcom and Intel 12.9% 12.2% • Boulder is recognized as the top city in the U.S. for 9.7% 9.5% 9.5% 8.9% education according to Forbes, and is home to the University of Colorado’s flagship campus, which enrolls approximately 33 thousand students Greeley Fort Collins Denver Boulder Colorado Texas Nationwide MSA MSA MSA MSA Source: S&P Global Market Intelligence, Forbes, Fortune, Greeley Economic Development Council, Fort Collins Chamber of Commerce 20

Transaction Assumptions and Valuation 37.5% of GBNK noninterest expense (80% realized in 2019, and 100% Cost Savings thereafter) • $28.5 million mark on gross loans (1.00% of gross loans) • $7.0 million mark on held-to-maturity securities – 4.5 year amortization Mark-to-Market • $8.9 million unrealized loss on available-for-sale securities – 4.5 year Adjustments amortization • $5.0 million fixed asset write-up Core Deposit Estimated 2.25% of all non-time deposits, 10 year amortization Intangibles GBNK Transaction Multiples Value as of April 27, 2018(1) Announced Value(2) Aggregate Value $969.4 M $1.0 B Per Share $33.07 $35.37 Price / Tangible Book Value 2.98x 3.19x Price / Est. 2018 Earnings per Share(3) 17.3x 18.5x Price / Est. 2019 Earnings per Share(3) 15.9x 17.0x Price / Est. 2019 EPS w/Synergies (3)(4) 11.1x 11.9x Core Deposit Premium 23.1% 25.5% (1) Based on an IBTX closing price of $73.50 on April 27, 2018, the date the parties entered into a letter of intent (2) Based on an IBTX closing price of $78.60 on May 21, 2018 (3) Based on Wall Street analyst consensus EPS estimates 21 (4) Assumes hypothetical 100% realization of noninterest expense synergies

Financial Impact of Acquisition Estimated Pro Forma Transaction Consequences (1) GBNK Impact 2019 EPS Accretion (80% Cost Saves Realization) (%) ~ 5.1% 2020 EPS Accretion (%) ~ 6.5% 2020 EPS Accretion ($) ~ $0.39 Tangible Book Value per Share Accretion / (Dilution) ~ (4.7%) Tangible Book Value per Share Earnback (Years) ~ 3.1 IBTX Pro Forma Standalone w/ GBNK Capital Ratios 9/30/2018 12/31/2018 Tangible Common Equity / Tangible Assets 8.8% 8.7% Leverage Ratio 9.2% 9.5% Tier 1 Common Risk Based Ratio 9.8% 9.9% Tier 1 Risk Based Capital Ratio 10.2% 10.4% Total Risk Based Capital Ratio 12.4% 12.2% (1) Includes the impact of lost interchange revenue attributable to the Durbin amendment 22

Transaction Rationale • Premier Colorado franchise delivers an attractive core deposit base and strong profitability • Financially attractive transaction with EPS accretion of approximately 6.5% ‒ Tangible book value earnback of approximately 3 years ‒ IBTX remains well capitalized on a pro forma basis • High quality, committed management team and experienced, customer focused lenders • Significant scale in high-growth, metropolitan markets, including the Denver MSA ‒ Fill in and expansion of the branch footprint along the Colorado Front Range, with locations in the downtown or central business districts of Denver, Fort Collins, Greeley, Longmont and Boulder ‒ Substantially completes our Colorado acquisition strategy • Partnership with the fourth largest bank headquartered in Colorado ‒ GBNK is the largest bank operating exclusively in Colorado ‒ On a pro forma basis, IBTX will be ranked 8th in Colorado deposit market share, and will be the only Texas or Colorado headquartered bank with top 10 deposit market share in both states • Improves IBTX’s noninterest bearing deposits to deposits, cost of deposits and loan to deposit ratio ‒ GBNK noninterest bearing deposits over 30% ‒ GBNK cost of deposits of approximately 30 bps 23

Experienced Management Team Name / Title Background David R. Brooks -38 years in the financial services industry; 30 years at Independent Bank Chairman of the Board, CEO & President, -Active in community banking since the early 1980s - led the investor group that Director acquired Independent Bank in 1988 Daniel W. Brooks -35 years in the financial services industry; 29 years at Independent Bank Vice Chairman, Chief Risk Officer, Director -Active in community banking since the late 1980s Brian E. Hobart -24 years in the financial services industry; 13 years at Independent Bank Vice Chairman, Chief Lending Officer -Since 2009 has functioned as Chief Lending Officer of the Company Michelle S. Hickox -28 years in the financial services industry; 6 years at Independent Bank EVP, Chief Financial Officer -Previously a Financial Services Audit Partner at RSM US LLP James C. White -Over 30 years in the financial services industry EVP, Chief Operations Officer -Previously served as EVP/COO of Texas Capital Bank James P. Tippit -12 years in the financial services industry; 7 years at Independent Bank EVP, Corporate Responsibility -Previously functioned as Community Reinvestment Officer of Independent Bank -Over 35 years experience representing community banks in corporate, regulatory Mark S. Haynie and securities matters EVP, General Counsel -Previously an attorney, President and shareholder at Haynie Rake Repass & Kilmko, P.C., a law firm 24

Appendix 25

APPENDIX Supplemental Information - Non-GAAP Financial Measures (unaudited) Reconciliation of Adjusted Net Income, Adjusted Efficiency Ratio and Adjusted EPS--Quarterly Periods For the Quarters Ended ($ in thousands except per share data) September 30, 2018 June 30, 2018 March 31, 2018 December 31, 2017 September 30, 2017 Net Interest Income - Reported (a) $ 86,268 $ 78,909 $ 73,967 $ 75,254 $ 72,857 Income recognized on acquired loans (1,051) (954) (739) (2,463) (905) Adjusted Net Interest Income (b) 85,217 77,955 73,228 72,791 71,952 Provision Expense - Reported (c) 1,525 2,730 2,695 1,897 1,873 Noninterest Income - Reported (d) 12,749 10,133 9,455 13,579 12,130 Gain on sale of loans — — — — (338) (Gain) loss on sale of branch — — — (3,044) 127 Gain on sale of OREO and repossessed assets (95) (58) (60) (876) — (Loss) gain on sale of securities 115 10 224 (72) — Loss (gain) on sale of premises and equipment (220) 89 8 6 21 Recoveries on charged off loans acquired (230) (336) (287) (65) (994) Adjusted Noninterest Income (e) 12,319 9,838 9,340 9,528 10,946 Noninterest Expense - Reported (f) 52,655 49,158 44,958 49,553 47,904 OREO impairment — — (85) (375) (917) IPO related stock grant — (11) (125) (128) (128) Acquisition expense (2,594) (4,296) (974) (6,509) (3,013) Adjusted Noninterest Expense (g) 50,061 44,851 43,774 42,541 43,846 Income Tax Expense Reported (1) (h) $ 9,141 $ 7,519 $ 6,805 $ 18,190 $ 11,696 Adjusted Net Income (2) (b) - (c) + (e) - (g) = (i) $ 36,593 $ 32,239 $ 29,231 $ 25,313 $ 24,829 Average shares for basic EPS (j) 30,473,603 29,065,426 28,320,792 27,933,201 27,797,779 Average shares for diluted EPS (k) 30,563,717 29,157,817 28,426,145 28,041,371 27,901,579 Adjusted Basic EPS (i) / (j) $ 1.20 $ 1.11 $ 1.03 $ 0.91 $ 0.89 Adjusted Diluted EPS (i) / (k) 1.20 1.11 1.03 0.90 0.89 EFFICIENCY RATIO Amortization of core deposit intangibles (l) $ 1,519 $ 1,393 $ 1,331 $ 1,328 $ 1,409 Reported Efficiency Ratio (f - l) / (a + d) 51.64% 53.64% 52.30% 54.29% 54.71% Adjusted Efficiency Ratio (g - l) / (b + e) 49.77 49.50 51.40 50.06 51.19 PROFITABILITY Total Average Assets (m) $ 10,028,224 $ 9,164,915 $ 8,675,596 $ 8,702,597 $ 8,726,847 Return on Average Assets (annualized) (a - c + d - f - h) / (m) 1.41% 1.30% 1.35% 0.87% 1.07% Adjusted Return on Average Assets (annualized) (i) / (m) 1.45 1.41 1.37 1.15 1.13 (1) Effective January 1, 2018, the TCJA reduced the corporate U.S. statutory tax rate from 35% to 21%. The quarter ended December 31, 2017, includes a $5,528 charge to remeasure deferred taxes as a result of the enactment of the tax reform. (2) Assumes an effective tax rate of 20.4%, 19.8%, 19.0%, 33.2% and 33.2% for the quarters ended September 30, 2018, June 30, 2018, March 31, 2018, December 31, 2017 and September 30, 2017, respectively. The quarters ended 26 September 30, 2018 and June 30, 2018 exclude $11 thousand and $152 thousand of nondeductible acquisition expense, respectively, and the quarter ended December 31, 2017 excludes the $5.528 charge to remeasure deferred taxes as noted above and $259 thousand of nondeductible tax expense.

APPENDIX Supplemental Information - Non-GAAP Financial Measures (unaudited) Reconciliation of Adjusted Net Income, Adjusted Efficiency Ratio and Adjusted EPS--Annual Periods For the Year Ended December 31, ($ in thousands except per share data) 2017 2016 2015 Net Interest Income - Reported (a) $ 265,478 $ 183,806 $ 154,098 Income recognized on acquired loans (4,063) (1,765) (1,272) Adjusted Net Interest Income (b) 261,415 182,041 152,826 Provision Expense - Reported (c) 8,265 9,440 9,231 Noninterest Income - Reported (d) 41,287 19,555 16,128 Gain on sale of loans (351) — (116) (Gain) loss on sale of branch (2,917) 43 — Gain on sale of OREO/repossessed assets (850) (62) (290) Gain on sale of securities (124) (4) (134) Loss (gain) on sale of premises and equipment 21 (32) 358 Recoveries on charged off loans acquired (1,182) — — Adjusted Noninterest Income (e) 35,884 19,500 15,946 Noninterest Expense - Reported (f) 176,813 113,790 103,198 Senior leadership restructuring — (2,575) — OREO impairment (1,412) (106) (35) IPO related stock grant (508) (543) (624) Acquisition expense (17,259) (3,121) (3,954) Adjusted Noninterest Expense (g) 157,634 107,445 98,585 Income Tax Expense Reported (h) $ 45,175 $ 26,591 $ 19,011 Adjusted Net Income (1) (b) - (c) + (e) - (g) = (i) $ 88,878 $ 56,563 $ 41,056 Average shares for basic EPS (j) 25,636,292 18,501,663 17,321,513 Average shares for diluted EPS (k) 25,742,362 18,588,309 17,406,108 Adjusted Basic EPS (i) / (j) $ 3.47 $ 3.06 $ 2.37 Adjusted Diluted EPS (i) / (k) 3.45 3.04 2.36 EFFICIENCY RATIO Amortization of core deposit intangibles (l) $ 4,639 $ 1,964 $ 1,555 Reported Efficiency Ratio (f - l) / (a + d) 56.13% 54.99% 59.71% Adjusted Efficiency Ratio (g - l) / (b + e) 51.46 52.34 57.49 PROFITABILITY Total Average Assets (m) $ 7,966,421 $ 5,469,542 $ 4,395,552 Return on Average Assets (annualized) (a - c + d - f - h) / (m) 0.96% 0.98% 0.88% Adjusted Return on Average Assets (annualized) (i) / (m) 1.12 1.03 0.93 (1) Excludes $5,528 charge to remeasure deferred taxes as a result of the enactment of the TCJA and $259 thousand of one-time nondeductible tax expense and assumes the resulting normalized effective tax rate of 32.4% for the year ended December 31, 2017. Assumes actual effective tax rate of 33.2% and 32.6% for the 27 years ended December 31, 2016, and 2015, respectively.

APPENDIX Supplemental Information - Non-GAAP Financial Measures (unaudited) Reconciliation of Tangible Common Equity to Tangible Assets ($ in thousands) As of and for the Quarter Ended September 30, 2018 June 30, 2018 March 31, 2018 December 31, 2017 December 31, 2016 December 31, 2015 Tangible Common Equity Total common stockholders' equity $ 1,567,184 $ 1,538,269 $ 1,354,699 $ 1,336,018 $ 672,365 $ 603,371 Adjustments: Goodwill (721,784) (721,578) (621,458) (621,458) (258,319) (258,643) Core deposit intangibles, net (46,533) (48,052) (41,913) (43,244) (14,177) (16,357) Tangible Common Equity $ 798,867 $ 768,639 $ 691,328 $ 671,316 $ 399,869 $ 328,371 Tangible Assets Total Assets $ 9,891,464 $ 10,017,037 $ 8,811,014 $ 8,684,463 $ 5,852,801 $ 5,055,000 Adjustments: Goodwill (721,784) (721,578) (621,458) (621,458) (258,319) (258,643) Core deposit intangibles (46,533) (48,052) (41,913) (43,244) (14,177) (16,357) Tangible Assets $ 9,123,147 $ 9,247,407 $ 8,147,643 $ 8,019,761 $ 5,580,305 $ 4,780,000 Tangible Common Equity To Tangible Assets 8.76% 8.31% 8.49% 8.37% 7.17% 6.87% 28

Contact Information Corporate Headquarters Analysts/Investors: Independent Bank Group, Inc. Michelle Hickox 1600 Redbud Blvd Executive Vice President and Chief Financial Officer Suite 400 (972) 562-9004 McKinney, TX 75069 mhickox@ibtx.com Mark Haynie Executive Vice President and General Counsel (972) 562-9004 mhaynie@ibtx.com Media: 972-562-9004 Telephone Peggy Smolen 972-562-7734 Fax Senior Vice President, Marketing & Communications Director www.ibtx.com (972) 562-9004 psmolen@ibtx.com RAISING STANDARDS TOGETHER 29

About Us A Standard of Excellence Our unique brand of banking extends from the Gulf Coast of Texas to the Rocky Mountains. We are an $8 billion dollar community-centric institution providing a wide range of relationship-driven commercial banking products and services tailored to meet the needs of businesses, professional organizations, community groups and entrepreneurs. We also offer a full line of personal financial products and services to make banking easy for busy families and individuals. Our Core Values Principled financial decisions ~ Building strong, healthy communities ~ Leading with a courageous heart Resilient Solutions ~ Thriving relationships The Bank provides capital and guidance to foster growth, bring new ideas to life, and energize local businesses. We accomplish these goals by funding projects such as medical facilities, warehouse space, and hospitality and education venues. By developing strong relationships and a deep understanding of your industry, our team offers a proactive approach to business banking. We continue to be named Best Bank within many of the communities we serve. Recently, Independent Bank was named a Community Bankers Cup winner for the fifth consecutive year; a Top 75 Producing Lender Nationwide; a Top 50 Performer by the Dallas Business Journal; and one of the Healthiest Employers in both North Texas and Central Texas. The Bank builds community on two fronts: by helping create economic development and by partnering within the community. It all begins by empowering our employees. We encourage our people to follow their passion and volunteer. And we back that up through formal giving programs. Our Mission To make an impact on the communities we serve through high-performance, purpose-driven banking. RAISING STANDARDS TOGETHER 30