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Exhibit 99.1

Vertex Announces Second Quarter 2026 Financial Results

KING OF PRUSSIA, PA – August 3, 2026: Vertex, Inc. (NASDAQ: VERX) (“Vertex” or the “Company”), the Decision-to-Defense™ global indirect tax and compliance company, today announced financial results for its second quarter ended June 30, 2026.

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“Vertex delivered solid second-quarter results, with revenue at the high end of our guidance and adjusted EBITDA exceeding our expectations,” said Christopher Young, President and Chief Executive Officer. “The quarter demonstrated the durability of our business and the earnings leverage we can generate through greater operating focus and discipline. Customer retention remained stable, and e-invoicing momentum improved as enterprises prepare for expanding global mandates and seek more comprehensive compliance solutions.”

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“We are making tangible progress in the transformation of Vertex. Our “AI-First” strategy is beginning to improve the speed and efficiency of selected engineering and customer-delivery workflows, and we have strengthened our leadership team to accelerate product innovation, operational execution, and growth. While we have more work to do, we enter the second half with a stronger operating foundation and clear opportunities to create additional value for customers and stockholders.”

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Second Quarter 2026 Financial Results

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Definitions of certain key business metrics and the non-GAAP financial measures used in this press release and reconciliations of such measures to the most directly comparable GAAP financial measures are included below under the headings “Definitions of Certain Key Business Metrics” and “Use and Reconciliation of Non-GAAP Financial Measures.”

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Financial Outlook

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For the third quarter of 2026, the Company currently expects:

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For the full-year 2026, the Company currently expects:

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John Schwab, Chief Financial Officer added, “Our second quarter performance reflects solid execution against our strategic and financial objectives. The consistency of our first-half results and the strength of our operating model increased our confidence in the full year, allowing us to narrow our revenue guidance range while raising our adjusted EBITDA outlook. We continue to focus on balancing growth investments with operating discipline, which we expect to result in expanding profitability and stronger cash generation in the third and fourth quarters.”

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The Company is unable to reconcile forward-looking Adjusted EBITDA to net income (loss), the most directly comparable GAAP financial measure, without unreasonable efforts because the Company is currently unable to predict with a reasonable degree of certainty the type and extent of certain items that would be expected to impact net income (loss) for these periods but would not impact Adjusted EBITDA. Such items may include stock-based compensation expense, depreciation and amortization of capitalized software costs and acquired intangible assets, severance expense, acquisition contingent consideration, changes in the fair value of acquisition contingent earn-outs, amortization of cloud computing implementation costs, severance expenses, acquisition-related retained employee compensation, transaction costs, and other items. The unavailable information could have a significant impact on the Company’s net income (loss). The foregoing forward-looking statements reflect the Company’s expectations as of today’s date. Given the number of risk factors, uncertainties and assumptions discussed below, actual results may differ materially. The Company does not intend to update its financial outlook until its next quarterly results announcement.

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Important disclosures in this earnings release about and reconciliations of non-GAAP financial measures to the most directly comparable GAAP financial measures are provided below under “Use and Reconciliation of Non-GAAP Financial Measures.”

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Conference Call and Webcast Information

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Vertex will host a conference call at 5:00 p.m. Eastern Time today, Monday, August 3, 2026, to discuss its second quarter 2026 financial results.

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Those wishing to participate should register in advance for the live event at https://vertex-earnings-q2-2026.open-exchange.net/registration.

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A live webcast of the event will also be available at the Company’s investor relations website at https://ir.vertexinc.com. An audio-only replay of the conference call will be available on the investor relations website for one year.

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About Vertex

Vertex is the Decision-to-Defense™ global indirect tax and compliance company. Vertex helps enterprises bring control to indirect tax and compliance across the full transaction lifecycle — from tax determination and e-invoicing through reporting, filing, and audit defense — to make outcomes easier to prove and improve over time. Trusted by more than 60% of the Fortune 500, Vertex combines decades of tax expertise, deep global tax and compliance knowledge, and embedded integrations to help organizations operate globally with confidence. With headquarters in North America and offices in South America and Europe, Vertex's purpose is to ensure businesses and communities thrive through trusted transactions. 

For more information, visit www.vertexinc.com or follow us on X and LinkedIn. 

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Forward-Looking Statements

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Any statements made in this press release that are not statements of historical fact, including statements about our beliefs and expectations, are forward-looking statements and should be evaluated as such. Forward-looking statements include information concerning possible or assumed future results of operations, including descriptions of our business plan and strategies, and our stock repurchase program. Forward-looking statements are based on Vertex management’s beliefs, as well as assumptions made by, and information currently available to, them. Because such statements are based on expectations as to future financial and operating results and are not statements of fact, actual results may differ materially from those projected. Factors which may cause actual results to differ materially from current expectations include, but are not limited to: our ability to maintain and grow revenue from existing customers and new customers, and expand their usage of our solutions; our ability to maintain and expand our strategic relationships with third parties; our ability to adapt to technological change and successfully introduce new solutions or provide updates to existing solutions; risks related to failures in information technology or infrastructure; risks related to our reliance on government infrastructure to support our e-invoicing services; challenges in using and managing use of Artificial Intelligence in our business; incorrect or improper implementation, integration or use of our solutions; failure to attract and retain qualified technical and tax-content personnel; competitive pressures from other tax software and service providers and challenges of convincing businesses using native enterprise resource planning functions to switch to our software; our ability to accurately forecast our revenue and other future results of operations based on recent success; our ability to offer specific software deployment methods based on changes to customers’ and partners’ software systems; our ability to continue making significant investments in software development and equipment; our ability to sustain and expand revenues, maintain profitability, and to effectively manage our anticipated growth; our ability to successfully diversify our solutions by developing or introducing new solutions or acquiring and integrating additional businesses, products, services, or content; our ability to successfully integrate acquired businesses and to realize the anticipated benefits of such acquisitions; risks related to the fluctuations in our results of operations; risks related to our expanding international operations; our exposure to liability from errors, delays, fraud or system failures, which may not be covered by insurance; our ability to adapt to organizational changes and effectively implement strategic initiatives; risks related to our determinations of customers’ transaction tax and tax payments; risks related to changes in tax laws and regulations or their interpretation or enforcement; our ability to manage cybersecurity and data privacy risks; our involvement in material legal proceedings and audits; risks related to undetected errors, bugs or defects in our software; risks related to utilization of open-source software, business processes and information systems; our ability to effectively protect, maintain, and enhance our brand; changes in application, scope, interpretation or enforcement of laws and regulations; global economic weakness and uncertainties, including the economic uncertainty created by the changing legal, regulatory, or taxation landscape in the United States, and disruption in the capital and credit markets; business disruptions related to natural disasters, epidemic outbreaks, including a global endemic or pandemic, terrorist acts, political events, or other events outside of our control; our ability to comply with anti-corruption, anti-bribery, and similar laws; our ability to protect our intellectual property; changes in interest rates, security ratings and market perceptions of the industry in which we operate, or our ability to obtain capital on commercially reasonable terms or at all; our ability to maintain an effective system of disclosure controls and internal control over financial reporting, or ability to remediate any material weakness in our internal controls; risks related to our Class A common stock and controlled company status; risks related to our stock repurchase program; risks related to our indebtedness and adherence to the covenants under our debt instruments; our expectations regarding the effects of the Capped Call Transactions (as defined in our Form 10-K) and regarding actions of the Option Counterparties (as defined in our Form 10-K) and/or their respective affiliates; risks associated with our Value Creation Plan; and the other factors described under the heading “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 (“Form 10-K”), filed with the Securities and Exchange Commission (the “SEC”) on February 24, 2026, as may be subsequently updated by our other SEC filings. Copies of such filings may be obtained from the Company or the SEC.

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All forward-looking statements reflect our beliefs and assumptions only as of the date of this press release. We undertake no obligation to update forward-looking statements to reflect future events or circumstances.

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Definitions of Certain Key Business Metrics  

Annual Recurring Revenue (“ARR”)

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We derive the vast majority of our revenues from recurring software subscriptions. We believe ARR provides us with visibility to our projected software subscription revenues in order to evaluate the health of our business. Because we recognize subscription revenues ratably, we believe investors can use ARR to measure our expansion of existing customer revenues, new customer activity, and as an indicator of future software subscription revenues. ARR is based on monthly recurring revenues (“MRR”) from software subscriptions for the most recent month at period end, multiplied by twelve. MRR is calculated by dividing the software subscription price, inclusive of discounts, by the number of subscription

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covered months. MRR only includes direct customers with MRR at the end of the last month of the measurement period. AARPC represents average annual revenue per direct customer and is calculated by dividing ARR by the number of software subscription direct customers at the end of the respective period.

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Net Revenue Retention (“NRR”)

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We believe that our NRR provides insight into our ability to retain and grow revenues from our direct customers, as well as their potential long-term value to us. We also believe it demonstrates to investors our ability to expand existing customer revenues, which is one of our key growth strategies. Our NRR refers to the ARR expansion during the 12 months of a reporting period for all direct customers who were part of our customer base at the beginning of the reporting period. Our NRR calculation takes into account any revenues lost from departing direct customers or those who have downgraded or reduced usage, as well as any revenue expansion from migrations, new licenses for additional products or contractual and usage-based price changes.

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Gross Revenue Retention (“GRR”)

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We believe our GRR provides insight into and demonstrates to investors our ability to retain revenues from our existing direct customers. Our GRR refers to how much of our MRR we retain each month after reduction for the effects of revenues lost from departing direct customers or those who have downgraded or reduced usage. GRR does not take into account revenue expansion from migrations, new licenses for additional products or contractual and usage-based price changes. GRR does not include revenue reductions resulting from cancellations of customer subscriptions that are replaced by new subscriptions associated with customer migrations to a newer version of the related software solution.  

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Customer Count

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The following table shows Vertex’s direct customers, as well as indirect small business customers sold and serviced through the Company’s one-to-many channel strategy.

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Use and Reconciliation of Non-GAAP Financial Measures

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In addition to our results determined in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and key business metrics described above, we have calculated non-GAAP cost of revenues, non-GAAP gross profit, non-GAAP gross margin, non-GAAP research and development expense, non-GAAP selling and marketing expense, non-GAAP general and administrative expense, non-GAAP operating income, non-GAAP net income, non-GAAP diluted EPS, Adjusted EBITDA, Adjusted EBITDA margin, free cash flow and free cash flow margin, which are each non-GAAP financial measures. We have provided tabular reconciliations of each of these non-GAAP financial measures to its most directly comparable GAAP financial measure.

Management uses these non-GAAP financial measures to understand and compare operating results across accounting periods, for internal budgeting and forecasting purposes, and to evaluate financial performance and liquidity. Our non-GAAP financial measures are presented as supplemental disclosure as we believe they provide useful information to investors and others in understanding and evaluating our results, prospects, and liquidity period-over-period without the impact of certain items that do not directly correlate to our operating performance and that may vary significantly from period to period for reasons unrelated to our operating performance, as well as comparing our financial results to those of other companies. Our definitions of these non-GAAP financial measures may differ from similarly titled measures presented by other companies and therefore comparability may be limited. In addition, other companies may not publish these or similar metrics. Thus, our non-GAAP financial measures should be considered in addition to, not as a substitute for, or in isolation from, the financial information prepared in accordance with GAAP, and should be read in conjunction with the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2025, as filed with the SEC on February 24, 2026 and our Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, to be filed with the SEC.

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We calculate these non-GAAP financial measures as follows:

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We encourage investors and others to review our financial information in its entirety, not to rely on any single financial measure and to view these non-GAAP financial measures in conjunction with the related GAAP financial measures.

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Vertex, Inc. and Subsidiaries

Consolidated Balance Sheets

(Unaudited)

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Vertex, Inc. and Subsidiaries

Consolidated Statements of Comprehensive Income (Loss)

(Unaudited)

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Vertex, Inc. and Subsidiaries

Consolidated Statements of Cash Flows

(Unaudited)

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Summary of Non-GAAP Financial Measures

(Unaudited)

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Vertex, Inc. and Subsidiaries

Reconciliation of GAAP to Non-GAAP Financial Measures

(Unaudited)

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Vertex, Inc. and Subsidiaries

Reconciliation of GAAP to Non-GAAP Financial Measures (continued)

(Unaudited)

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