This document provides an overview of First Financial Bankshares, Inc. for the 4th quarter of 2015. It begins with a forward-looking statement noting that numbers are unaudited and certain statements could be considered forward-looking. It then provides information on who First Financial is, their recognitions, what makes them different through their regional structure, their markets in Texas, recent acquisitions and growth, management team, financial performance on assets, deposits, loans, and credit quality, and summaries of their bond and loan portfolios. The document aims to provide high-level context on First Financial for investors.

1. 0
4th Quarter 2015
First Financial Bankshares, Inc.

2. Forward Looking Statement
The numbers, as of and for the year ended December 31, 2015, contained within this presentation are
unaudited. Certain statements contained herein may be considered “forward-looking statements” as
defined in the Private Securities Litigation Reform Act of 1995. These statements are based upon the
belief of the Company’s management, as well as assumptions made beyond information currently
available to the Company’s management and, may be, but not necessarily are identified by such words
as “expect”, “plan”, “anticipate”, “target”, “forecast” and “goal”. Because such “forward-looking
statements” are subject to risks and uncertainties, actual results may differ materially from those
expressed or implied by such forward-looking statements. Factors that could cause actual results to
differ materially from the Company’s expectations include competition from other financial institutions
and financial holding companies; the effects of and changes in trade, monetary and fiscal policies and
laws, including interest rate policies of the Federal Reserve Board; changes in the demand for loans;
fluctuations in value of collateral and loan reserves; inflation, interest rate, market and monetary
fluctuations; changes in consumer spending, borrowing and savings habits; and acquisitions and
integration of acquired businesses, and similar variables. Other key risks are described in the
Company’s reports filed with the Securities and Exchange Commission, which may be obtained under
“Investor Relations-Documents/Filings” on the Company’s web site or by writing or calling the Company
at 325.627.7155. The Company does not undertake any obligation to update publicly or revise any
forward-looking statements herein because of new information, future events or otherwise.

3. 2
Who We Are
$6.7 billion financial holding company
headquartered in Abilene, Texas
Group of 11 separate regions
125-year history
Growth markets include 50 mile radius of
the larger cities of Texas

4. 3

5. Recognitions
 ABA Foundation Community Commitment Award – October 2015
 2015 Proven Performers Award Winner – Bank Intelligence
Solutions
 American Banker - #15 – Based on three year average Return on
Equity – May 2015
 KBW Honor Roll – One of twenty five banks named – April 2015
 Raymond James Community Bankers Cup #1 – December 2014
4

6. 5
What Makes Us Different
One Bank, Eleven Regions Concept
 One Bank
 Consolidation of backroom operations, technology, and
compliance (lower efficiency ratio)
 Eleven Regions
 Regional Presidents run their regions
 Local Boards – Movers and Shakers of the Community
 Keep our regions locally focused
 Make sure we meet the needs of the community
 Help us make better loan decisions
 Help us market the region

7. 6
FFIN’s Unique Positioning in Texas
Bank Key Markets
Comerica DFW, Austin, Houston, California, Michigan, Florida, Mexico
Green Houston, Austin, Dallas (New Public Company – August 2014)
Frost San Antonio, Austin, Corpus Christi, DFW, Rio Grande, West Texas
Independent North and Central Texas
International Bancshares Rio Grande, Houston, San Antonio, Oklahoma
Legacy Texas Dallas
Prosperity Houston, DFW, Austin, West Texas, South Central Texas, and Oklahoma
Southside East Texas
Texas Capital DFW, Austin, San Antonio, and Houston
Triumph Dallas (New Public Company – November 2014)
Veritex Dallas (New Public Company – October 2014)

8. 7
First Bank, N.A. - Conroe Acquisition
 Consummated July 31, 2015
 Montgomery, Walker, & Harris Counties (On I-45 North of Houston)
 Exxon Mobil Headquarters in the Woodlands
 Montgomery County – Approximately 500,000 residents, 55% growth from 2000 to
2010, 24th fastest growing county in the United States
 #4 Market Share in Conroe – 10.6%
 8 Branches in Conroe, Magnolia, Tomball, Cut and Shoot, Montgomery, and
Huntsville; additional site on Grand Parkway in Spring, Texas to expand
 $393.0 million in Assets*
 $330.9 million in deposits
 $270.6 million in loans
 1.06% Return on Assets in 2014
 $61.0 million purchase price of our stock which represents 16x last twelve
months earnings
 Conroe acquisition is consistent with our acquisition model of high growth areas,
strong management and excellent earnings opportunity
 Provides diversification and fits well into our footprint
 Management and Board share same values to outstanding customer service
*As of Dec. 31, 2015

9. 8
4Trust Mortgage Acquisition
 Consummated – May 31, 2015
 Originated $175 million in mortgage loans in 2014 – Compared to $225 million that
First Financial Bank originated in 2014
 15 year old Company with offices in Fort Worth, Dallas and North Richland Hills
 $1.9 million purchase price
 Troy Fore is now President of Mortgage Division of First Financial Bank; other
owners joining First Financial as EVP’s – Tammie Harding, Kami Graves, and Ryan
Craig
 Considered one of the top mortgage companies in Fort Worth
 Are now offering expanded mortgage products and services to customers

10. 9

11. 10
Texas: Large and Growing
Five most populous states:* Growth
(2004 – 2014)
California 38.8 million 8.1%
Texas 26.9 million 20.1%
Florida 19.9 million 15.0%
New York 19.7 million 2.6%
Illinois 12.9 million 1.8%
* U.S. Census Bureau

12. 11
Target Markets – Population Growth
Population growth (2004-2014) in FFIN expansion markets:*
Texas 20.1%
Bridgeport & Wise County 19.4%
Fort Worth & Tarrant County 21.4%
Cleburne & Johnson County 14.4%
Weatherford, Willow Park, Aledo & Parker County 30.3%
Granbury & Hood County 19.6%
Stephenville & Erath County 15.9%
Conroe & Montgomery County 47.0%
* U.S. Census Bureau

13. Core Markets: West Central Texas
 Markets served benefiting from well-established,
long- time customers
REGION
ASSET
SIZE*
LOCATIONS
DEPOSIT
MARKET SHARE**
MARKET
SHARE RANK**
First Financial Bank
(Abilene, Clyde, Moran, Albany, Odessa
Eastland, Ranger, Rising Star, Cisco,
Sweetwater, Roby, Trent, Merkel)
$2,615M 23 48% 1
First Financial Bank
(Hereford)
$176M 1 44% 1
First Financial Bank
(San Angelo)
$694M 3 27% 1
TOTALS $3,485M 27
* Data as of 12-31-15
** Data as of 06-30-15
12

14. Expansion Markets
REGION ASSET SIZE* LOCATIONS
DEPOSIT MARKET
SHARE**
MARKET SHARE
RANK**
First Financial Bank
(Cleburne, Burleson, Alvarado)
(Midlothian, Waxahachie)
$401M 4
2
24%
5%
1
6
First Financial Bank
(Southlake, Trophy Club, Keller, Grapevine)
(Bridgeport, Decatur, Boyd)
$402M 4
3
4%
18%
6
3
First Financial Bank
(Stephenville, Granbury, Glen Rose, Acton)
$482M 6 24% 2
First Financial Bank
(Weatherford, Aledo, Willow Park, Brock)
$533M 7 23% 1
First Financial Bank
(Mineral Wells)
$269M 1 39% 1
First Financial Bank
(Ft. Worth)
$49M 1 - -
First Financial Bank
(Orange, Mauriceville, Vidor)
(Newton, Port Arthur, Beaumont)
$482M 3
3
38%
2%
1
9
First Financial Bank (Acquired 7-31-15)
(Conroe, Magnolia, Cut and Shoot, Montgomery, Huntsville, Willis, Tomball,
Huntsville, New Waverly
Market Share for Huntsville, Conroe, Magnolia, Cut and Shoot, Montgomery and Willis Only)
$585M 10 4% 9
TOTALS $3,154M 43
* Data as of 12-31-15
** Data as of 06-30-15
13

15. Recent De Novo Growth
 Lubbock: Office of Trust Company – September 2014
 New Waverly: Branch of Huntsville – August 2014
 Beaumont: Branch of Orange – August 2014
 Weatherford: I-20 Branch – June 2013
 San Angelo: HEB Branch – March 2013
 Waxahachie: Branch of Cleburne – December 2012
 Abilene: Antilley Road Branch – September 2012
 Grapevine: Branch of Southlake – March 2012
 Cisco: Branch of Eastland – September 2011 (Building New Building – Planned Opening 2nd Qtr. 2016)
 Lamesa: Office of Trust Company – April 2011
 Odessa: Branch of Abilene – February 2010 (Building New Building – Planned Opening 2nd Qtr. 2016)
 Fort Worth: Branch of Weatherford – February 2010
 Odessa: Office of Trust Company – April 2009
 Merkel: Branch of Sweetwater – July 2008
 Brock: Branch of Weatherford – March 2008
 Acton: Branch of Stephenville – March 2008
 Albany: Branch of Abilene – May 2007
 Fort Worth: Office of Trust Company – April 2007 (Building New Building – Planned Opening 2nd Qtr. 2016)
14

16. Fort Worth – Forest Park Blvd. and Rosedale
1515

17. Fort Worth – Forest Park Blvd. and Rosedale
16

18. Years with Company Years in Industry
Scott Dueser
Chairman of the Board, President &
Chief Executive Officer
39 44
Ron Butler
Executive Vice President
Chief Administrative Officer
23 34
Troy Fore
President
First Financial Mortgage
- 35
Gary S. Gragg
Executive Vice President
Credit Administration
25 37
J. Bruce Hildebrand, CPA
Executive Vice President
Chief Financial Officer
13 37
Executive Management at First Financial
17

19. Years with Company Years in Industry
Luke Longhofer
Executive Vice President & Loan Review Officer
Credit Administration
3 10
Stan Limerick
Executive Vice President
Chief Information Officer
1 35
Randy Roewe
Executive Vice President
Chief Risk Officer
- 25
Kirk Thaxton, CTFA
President
First Financial Trust & Asset Management
29 32
Marna Yerigan
Executive Vice President
Credit Administration
5 31
Executive Management at First Financial
18

20. Years with Company Years in Industry
Brandon Harris
Senior Vice President
Appraisal Services
2 15
Monica Houston
Senior Vice President
Training
20 20
Larry Kentz
Senior Vice President & Compliance Officer
Compliance
1 35
Michele Stevens
Senior Vice President
Advertising and Marketing
16 32
Senior Management at First Financial
19

21. Experienced Regional CEOs & Presidents
Years with Company Years in Industry
Marelyn Shedd, Abilene 24 32
Mike Mauldin, Hereford 13 38
Mike Boyd, San Angelo 31 43
Tom O’Neil, Cleburne 17 35
Trent Swearengin, Stephenville 16 18
Jay Gibbs, Weatherford 14 41
Mark Jones, Southlake 15 38
Ken Williamson, Mineral Wells 14 44
Stephen Lee, Southeast Region 3 26
Sam Baker, Conroe - 39
Martin Noto, Fort Worth - 30
20

22. 21
$3,776
$4,121
$4,502
$5,522
$5,848
$6,665
2010 2011 2012 2013 2014 2015
Growth in Total Assets
Asset Performance
(in millions)

23. 22
$959 $1,102 $1,312 $1,362 $1,570 1,746
$2,154
$2,233
$2,321
$2,773
$3,180
$3,444
2010 2011 2012 2013 2014 2015
Non Interest Bearing Interest Bearing
Deposit Growth
Growth in FFIN Total Deposits (in millions)
$5,190
$3,113
$3,335
$3,633
$4,135
$4,750

24. 23
Deposit Products
Time
12.0%
Demand
33.6%
Money
Market
43.0%
Savings
11.4%

25. Account Growth
Net Growth in 2011 – 4,036 Accounts
Net Growth in 2012 – 1,219 Accounts
Net Growth in 2013 – 3,308 Accounts*
Net Growth in 2014 – 10,687 Accounts
Net Growth in 2015 – 5,886 Accounts**
December 31,
2011
December 31,
2012
December
31, 2013
December 31,
2014
December 31,
2015
Total Number
of Accounts
204,063 205,282 208,590 234,614 251,699
24
*(Excluding Orange Acquisition)
**(Excluding Conroe Acquisition)

26. $81 $66 $68 $76 $106 $102
$191 $218 $273 $334 $361 $386
$429 $427
$510
$590
$640 $685
$990 $1,076
$1,238
$1,689
$1,831
$2,178
2010 2011 2012 2013 2014 2015
Real Estate
Commercial
Consumer
Agricultural
Loan Performance
Growth in FFIN Total Loans (in millions)
$1,691
$1,787
$2,089
$3,351
25
$2,689
$2,938

27. 26
Overview of Loan Portfolio
Commercial
20.4%
Agriculture
3.1%
Consumer
11.5%
Real Estate
65.0%
Note: Oil & Gas Exposure 2.89%

28. Residential
Development &
Construction
9.7%
1-4 Family
44.6%
Commercial
Development and
Construction
5.1%
Commercial R/E
25.4%
Other R/E
15.2%
27
Breakdown of R/E Loan Portfolio

29. 28
2010 2011 2012 2013 2014 2015
End of
Period 54.3 53.6 57.5 65.0 61.8 64.6
Average
Balances
56.0 54.6 56.4 64.3 64.1 63.0
Loan to Deposit Ratio

30. 2010 2011 2012 2013 2014 2015
First
Financial 1.53% 1.64% 1.22% 1.16% 0.74% 0.89%
Peer Group 5.37% 4.59% 2.75% 1.97% 1.28% 0.94%*
Sound Lending Practices
Nonperforming assets as a percentage of loans + foreclosed assets (FFIN vs. Peers)
29
*As of Sept. 30, 2015

31. 30
$31,106
$34,315 $34,839 $33,900
$36,824
$41,877
$8,962
$6,626
$3,484 $3,753 $4,465
$9,685
2010 2011 2012 2013 2014 2015
ALLL Provision
Allowance for Loan Losses and Provision for Loan Losses
(in thousands)

32. Summary of Bond Portfolio
Agencies
5.80%
Corporates
3.13%
Muni
51.61%
MBSs
15.81%
CMOs
23.23%
Treasuries
0.42%
31

33. $2,297 $2,431
$2,852
$3,361
$3,759
$3,870
$1,783 $1,912
$2,233
$2,465
$2,774
$3,060
2010 2011 2012 2013 2014 2015
Growth in Trust Assets
Total Trust Assets
32
MarketValue
BookValue

34. 33
$10,808
$12,671
$14,464
$16,317
$18,766 $19,251
2010 2011 2012 2013 2014 2015
Total Trust Fees
Growth in FFTAM Fees (in thousands)

35. 34
$3,254
$4,176
$5,183
$6,142
$7,109
$7,449
2010 2011 2012 2013 2014 2015
Total Trust Net Income
Growth in FFTAM Net Income (in thousands)

36. $59.7
$68.4
$74.2
$78.9
$89.6
$100.4
2010 2011 2012 2013 2014 2015
29th Consecutive Year of Increased Earnings
FFIN Earnings (in millions)
35

37. 36
$0.95
$1.09
$1.18
$1.24
$1.40
$1.55
2010 2011 2012 2013 2014 2015
Strong Shareholder Earnings
Basic Earnings Per Share
*Per share amounts reflect the 2 for 1 stock split that was effective June 2, 2014.

38. 1.78% 1.75%
1.64% 1.65%
1.61%
0.80%
0.98%
1.04%
0.95% 0.98%*
2011 2012 2013 2014 2015
FFIN Outperforms Peers
Percentage Return on Average Assets
PeerGroup
FirstFinancial
37
*As of Sept. 30, 2015

39. 14.44%
13.85% 13.75% 14.00% 13.60%
7.27%
8.56% 8.89%
8.34% 8.67%*
2011 2012 2013 2014 2015
Strong Return on Capital
Percentage Return on Average Equity
PeerGroup
FirstFinancial
38
*As of Sept. 30, 2015

40. 39
2011 2012 2013 2014 2015
Shareholders’
Equity 508,537 556,963 587,647 681,537 804,986
As a Percent of Total
Assets
12.34 12.37 11.25 11.65 12.08
Tangible
Capital
436,415 484,990 490,163 584,178 660,537
Tier 1
Leverage Ratio
10.33 10.60 9.84 9.89 9.96
Tier 1 Risk
Based Capital Ratio
17.49 17.43 15.82 16.05 15.90
Risk Based
Capital Ratio
18.74 18.68 16.97 17.16 16.97
Capital & Capital Ratios
(dollars in thousands)

41. 3.00%
3.25%
3.50%
3.75%
4.00%
4.25%
4.50%
4.75%
5.00%
3rd
Qtr. '12
4th
Qtr. '12
1st
Qtr. '13
2nd
Qtr. '13
3rd
Qtr. '13
4th
Qtr. '13
1st
Qtr. '14
2nd
Qtr. '14
3rd
Qtr. '14
4th
Qtr. '14
1st
Qtr. '15
2nd
Qtr. '15
3rd
Qtr. '15
4th
Qtr. '15
First Financial Peer Group
Net Interest Margin
Quarterly Interest Margin
40

42. 2010 2011 2012 2013 2014 2015
First
Financial 49.49% 48.37% 48.14% 50.20% 49.24% 47.61%
Peer Group 67.33% 65.57% 65.77% 67.80% 66.76% 63.79%*
Working Harder and Smarter
Efficiency Ratio (FFIN vs. Peers)
41
*As of Sept. 30, 2015

43. Stock cost in January 2015 $29,880
Dividend declared ($0.62 x 1,000 shares) $ 620
Increase in stock price during 2015
($29.88 to $30.17 X 1,000 shares)
$290
2015 return on investment 3.05%
2014 return on investment -7.96%
2013 return on investment 72.11%
2012 return on investment 19.65%
2011 return on investment 0.61%
5 year compound average return 12.36%
Total Return on Investment
13.95%
Assume you owned 1,000 shares of FFIN stock on January 1, 2015…
42
*Adjusted for 2 for 1 stock split effective June 2, 2014.

44. Dividends Per Share
$0.48 $0.50
$0.52
$0.55
$0.62
2011 2012 2013 2014 2015
Annual Dividends Declared Per Share*
43
*Per share amounts reflect the 2 for 1 stock split that was effective June 2, 2014.

45. Strong Stock Performance
-100.00%
-50.00%
0.00%
50.00%
100.00%
150.00%
200.00%
FFIN S&P 500 NASDAQ Dow Jones
Jan . ‘07 Dec. ’15Dec . ‘09Dec ‘07 Dec ‘08 Dec. ‘10 Dec. ’11 Dec. ’12 Dec. ’13 Dec. ’14
44

46. Challenges
Regulatory reform from Washington
Stagnant national economy
Oil & gas price decline
Low interest rate environment
Maintaining net interest margin
45

47. Opportunities
 Loan Growth
 Mortgage Lending
 Trust Services
 Treasury Management
 Mobile Banking
 Lower Efficiency Ratio
 Potential Acquisitions
46

48. 47