Exhibit 99.1

Paycom Software, Inc. Reports Third Quarter 2017 Results

Third Quarter Revenue of $101.3 million, up 31% from comparable prior year period

Third Quarter GAAP Net Income of $14.1 million, or $0.24 per diluted share, up 127% from comparable prior year period

Third Quarter Adjusted EBITDA of $30.7 million, up 69% from comparable prior year period

Third Quarter non-GAAP Net Income of $17.0 million, or $0.29 per diluted share

OKLAHOMA CITY –(BUSINESS WIRE)– Paycom Software, Inc. (“Paycom”) (NYSE: PAYC), a leading provider of comprehensive, cloud-based human capital management software, today announced its financial results for the quarter ended September 30, 2017.

“With third quarter revenues over $100 million and the launch of 10 internally built Learning Management courses, we’re pleased with another strong quarter of growth and innovation,” said Paycom’s founder and CEO, Chad Richison. “We also returned value to our shareholders by completing our second $50 million stock repurchase plan and I am happy to announce we have approved a third stock repurchase plan, increasing it to $75 million.”

Financial Highlights for the Third Quarter of 2017

Total Revenues of $101.3 million represented a 31% increase compared to total revenues of $77.3 million in the same period last year. Recurring revenues of $99.5 million also increased 31% from the comparable prior year period, and constituted 98% of total revenues.

GAAP Net Income was $14.1 million, or $0.24 per diluted share, compared to GAAP net income of $6.2 million, or $0.10 per diluted share, in the same period last year.

Adjusted EBITDA¹ was $30.7 million, compared to $18.2 million in the same period last year.

Non-GAAP Net Income¹ was $17.0 million, or $0.29 per diluted share, compared to $9.0 million, or $0.15 per diluted share, in the same period last year.

Cash and Cash Equivalents were $66.6 million as of September 30, 2017.

Total Debt was $34.4 million as of September 30, 2017. This debt consisted solely of borrowings related to the expansion of our corporate headquarters.

¹ Adjusted EBITDA and non-GAAP net income are non-GAAP financial measures. Please see the discussion below under the heading “Use of Non-GAAP Financial Information” and the reconciliations at the end of this release for additional information concerning these non-GAAP financial measures.

Financial Outlook

Paycom provides the following expected financial guidance for the quarter and year ending December 31, 2017:

Quarter Ending December 31, 2017

Total Revenues in the range of $111.5 million to $113.5 million.

Adjusted EBITDA in the range of $26 million to $28 million.

Year Ending December 31, 2017

Total Revenues in the range of $430.5 million to $432.5 million.

Adjusted EBITDA in the range of $131 million to $133 million.

We have not reconciled the Adjusted EBITDA ranges for the quarter or year ending December 31, 2017 to net income because applicable information for future periods, on which this reconciliation would be based, is not readily available due to uncertainty regarding, and the potential variability of, depreciation and amortization, interest expense, taxes, non-cash stock-based compensation expense and other items. Accordingly, a reconciliation of these Adjusted EBITDA ranges to net income is not available at this time without unreasonable effort.

Use of Non-GAAP Financial Information

To supplement our financial information presented in accordance with generally accepted accounting principles in the United States (“GAAP”), we consider and have included certain non-GAAP financial measures in this press release, including Adjusted EBITDA and non-GAAP net income. Management uses Adjusted EBITDA and non-GAAP net income as supplemental measures to review and assess the performance of our core business operations and for planning purposes. We define: (i) Adjusted EBITDA as net income plus interest expense, taxes, depreciation and amortization, and non-cash stock-based compensation expense; and (ii) non-GAAP net income as net income plus non-cash stock-based compensation expense, which is adjusted for the effect of income taxes. Adjusted EBITDA and non-GAAP net income are metrics that provide investors with greater transparency to the information used by management in its financial and operational decision-making. We believe these metrics are useful to investors because they facilitate comparisons of our core business operations across periods on a consistent basis, as well as comparisons with the results of peer companies, many of which use similar non-GAAP financial measures to supplement results under GAAP. In addition, Adjusted EBITDA is a measure that provides useful information to management about the amount of cash available for reinvestment in our business, repurchasing common stock and other purposes. Management believes that the non-GAAP measures presented in this press release, when viewed in combination with our results prepared in accordance with GAAP, provide a more complete understanding of the factors and trends affecting our business and performance.

Adjusted EBITDA and non-GAAP net income are not measures of financial performance under GAAP and should not be considered a substitute for net income, which we consider to be the most directly comparable GAAP measure. Adjusted EBITDA and non-GAAP net income have limitations as analytical tools, and when assessing our operating performance, you should not consider Adjusted EBITDA or non-GAAP net income in isolation, or as a substitute for net income or other consolidated statements of income data prepared in accordance with GAAP. Adjusted EBITDA and non-GAAP net income may not be comparable to similar titled measures of other companies and other companies may not calculate such measures in the same manner as we do.

Conference Call Details:

In conjunction with this announcement, Paycom will host a conference call today, Oct. 31, 2017, at 5:00 p.m. Eastern time to discuss its financial results. To access this call, dial (866) 270-1533 (domestic) or (412) 317-0797 (international) and announce Paycom as the conference name to the operator. A live webcast as well as the replay of the conference call will be available on the Investor Relations page of Paycom’s website at investors.paycom.com. A replay of this conference call can also be accessed by dialing (877) 344-7529 (domestic) or (412) 317-0088 (international) until Nov. 7, 2017. The replay passcode is 10113050.

About Paycom

As a leader in payroll and HR technology, Oklahoma City-based Paycom redefines the human capital management industry by allowing companies to effectively navigate a rapidly changing business environment. Its cloud-based software solution is based on a core system of record maintained in a single database for all human capital management functions, providing the functionality that businesses need to manage the complete employment lifecycle, from recruitment to retirement. Paycom has the ability to serve businesses of all sizes and in every industry. As one of the leading human capital management providers, Paycom serves clients in all 50 states from offices across the country.

Forward-Looking Statements

Certain statements in this press release are, and certain statements on the related teleconference call may be, forward looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are any statements that refer to the Company’s estimated or anticipated results, other non-historical facts or future events and include, but are not limited to, statements regarding our business strategy; anticipated future operating results and operating expenses, cash flows, capital resources, dividends and liquidity; trends, opportunities and risks affecting our business, industry and financial results; future expansion or growth plans and potential for future growth; our ability to attract new clients to purchase our solution; our ability to retain clients and induce them to purchase additional applications; our ability to accurately forecast future revenues and appropriately plan our expenses; market acceptance of our solution and applications; our expectations regarding future revenues generated by certain applications; the impact of future regulatory, judicial, or legislative changes;

how certain factors affecting our performance correlate to improvement or deterioration in the labor market; our plan to open additional sales offices and our ability to effectively execute such plan; the sufficiency of our existing cash and cash equivalents to meet our working capital and capital expenditure needs over the next 12 months; our ability to expand our corporate headquarters within an expected timeframe; our plans regarding our capital expenditures and investment activity as our business grows, including with respect to research and development; our expected income tax rate for future periods; our plans to purchase shares of our common stock through a stock repurchase plan; and the anticipated impact of recent hurricanes on our operating results in future periods. In addition, forward-looking statements also consist of statements involving trend analyses and statements including such words as “anticipate,” “believe,” “could,” “expect,” “may,” “might,” “plan,” “possible,” “potential,” “project,” “should,” “would,” and similar expressions or the negative of such terms or other comparable terminology. These forward-looking statements speak only as of the date hereof and are subject to business and economic risks. As such, our actual results could differ materially from those set forth in the forward-looking statements as a result of the factors discussed in our filings with the Securities and Exchange Commission, including but not limited to those discussed in our Annual Report on Form 10-K for the year ended December 31, 2016. We do not undertake any obligation to update or revise the forward-looking statements to reflect events or circumstances that exist after the date on which such statements were made, except to the extent required by law.

Paycom Software, Inc.

Consolidated Balance Sheets

(in thousands, except share amounts)

(unaudited)

Paycom Software, Inc.

Consolidated Statements of Income

(in thousands, except per share and share amounts)

(unaudited)

Paycom Software, Inc.

Consolidated Statements of Cash Flows

(in thousands)

(unaudited)

Paycom Software, Inc.

Reconciliation of GAAP to non-GAAP Financial Measures

(in thousands, except share and per share amounts)

(unaudited)

Contacts

Paycom Software, Inc.

Media Contact:

Kathy Oden-Hall, 800-580-4505

CMO

media@paycom.com

or

Investor Relations Contact:

David Niederman, 855-603-1620

investors@paycom.com

Source: Paycom Software, Inc.