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945 East Paces Ferry Road, NE STE 1600

16th Floor, Atlanta, Georgia 30326

EXECUTIVE OVERVIEW AND EARNINGS SUMMARY

Atlanta, GA - April 26, 2018 - Atlantic Capital Bancshares, Inc. (NASDAQ: ACBI) announced results of the 1st quarter ending March 31st 2018.

First Quarter Highlights

• / Grew loans held for investment by $25 million to $1.96 billion from December 31, 2017.
• / Grew commercial and industrial loans by $21 million to $636 million from December 31, 2017.
• / Reported net interest margin of 3.51%, an increase of 12 basis points from the fourth quarter of 2017.
• / Reported nonperforming assets to total assets of 0.13% and annualized net charge-offs to average loans of 0.05%.
• / Increased noninterest income $415,000 to $4.0 million compared to the fourth quarter of 2017.
• / Decreased noninterest expense $2.2 million to $18.4 million compared to the fourth quarter of 2017.

“These improved results reflect solid growth in our core corporate and business banking activities, higher loan yields, and the benefit of our cost reduction initiatives undertaken in prior quarters. We anticipate continued improvement in operating results throughout 2018 and into next year,” explained Douglas Williams, President and Chief Executive Officer.

Result of Operations

Net interest income increased to $21.6 million in the first quarter of 2018 from $21.3 million in the fourth quarter of 2017, primarily as a result of higher loan yields and higher loan balances. Net accretion income on acquired loans totaled $448,000 in the first quarter of 2018 compared to $686,000 in the fourth quarter of 2017.

Net interest margin was 3.51% in the first quarter of 2018, an increase of 12 basis points from the fourth quarter of 2017. The accretion from the acquired loan discount and amortization of time deposit premium contributed 9 basis points to the net interest margin in the first quarter of 2018 compared to 12 basis points in the fourth quarter of 2017.

Loan yields in the first quarter of 2018 increased 13 basis points to 4.74% from the fourth quarter of 2017 as a result of the increases in the federal funds rate and 1 month LIBOR, offset by a decrease in accretion income. Accretion income contributed 9 basis points to the loan yield in the first quarter of 2018 compared to 15 basis points in the fourth quarter of 2017.

The cost of total deposits in the first quarter of 2018 was 0.57%, an increase of 5 basis points from the fourth quarter of 2017. The cost of interest bearing deposits increased 8 basis points to 0.81% from the fourth quarter of 2017, driven by increased competition for deposits.

The provision for loan losses was $772,000 in the first quarter of 2018 compared to $282,000 in the fourth quarter of 2017. The first quarter included net charge offs of $231,000 compared to a net recovery of $192,000 in the fourth quarter of 2017.

Noninterest income totaled $4.0 million in the first quarter of 2018, an increase of $415,000 from the fourth quarter of 2017. SBA income increased $459,000 in the first quarter of 2018 from the fourth quarter of 2017 due to a higher volume of SBA loan sales.

(1)Commentary is on a fully taxable-equivalent basis unless otherwise noted. Consistent with SEC guidance in Industry Guide 3 that contemplates the calculation of tax-exempt income on a tax equivalent basis, net interest income and net interest margin are provided on a fully taxable-equivalent basis, which generally assumes a 21% marginal tax rate for 2018 and 35% for 2017 and prior. We provide detailed reconciliations in the Non-GAAP Performance and Financial Measures Reconciliation table beginning on page 11. See Non-GAAP Financial Measures below for additional information.

The closing on the sale of the Southeastern Trust Company is expected to occur in the second quarter of 2018 and result in a gain of approximately $1.7 million. Quarterly expense savings are expected to be approximately $450,000 to $500,000 but will be offset by an expected decrease in quarterly trust income of approximately $518,000, based on first quarter 2018 results.

Noninterest expense totaled $18.4 million in the first quarter of 2018 compared to $20.6 million in the fourth quarter of 2017. Salaries and employee benefits expense decreased by $1.2 million in the first quarter of 2018 to $12.1 million and included $1.1 million in severance expense and seasonally higher payroll taxes. Professional fees decreased $448,000 from lower legal and consulting fees. The first quarter of 2018 included a write down on other real estate owned of $227,000 on a previously closed branch.

About Atlantic Capital Bancshares

Atlantic Capital Bancshares, Inc. is a $2.7 billion publicly traded bank holding company headquartered in Atlanta, Georgia. Atlantic Capital offers banking, treasury management, capital markets, trust, and mortgage services to privately held companies and individuals in Atlanta, eastern Tennessee, and northwest Georgia. Atlantic Capital also provides specialized financial services to select clients nationally.

Media Contact:

Ashley Carson

Corporate and Community Affairs Executive

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Phone: 404-995-6050

Financial Contact:

Patrick Oakes

Executive Vice President and Chief Financial Officer

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Phone: 404-995-6050