Exhibit 99.1

Endurance International Group Reports 2020 Second Quarter Results and Announces the Acquisition of Retention Science

BURLINGTON, MA (July 30, 2020) — Endurance International Group Holdings, Inc. (NASDAQ: EIGI), a leading provider of cloud-based platform solutions designed to help small and medium-sized businesses succeed online, today reported financial results for its second quarter ended June 30, 2020.

“Against a backdrop of significant macro-economic disruption due to the COVID-19 pandemic, we are encouraged by the resilience of small businesses and their drive to adapt. As we noted in our preliminary update two weeks ago, we see secular demand for our products and services and are pleased with our subscriber additions and revenue growth,” commented Jeffrey H. Fox, president and chief executive officer of Endurance International Group.

“As we execute the second half of 2020, we remain focused on investments that we believe will increase the value we deliver to our customers, including an expanded solution set. As such, we are pleased to announce that we signed an agreement to acquire Retention Science, an AI-driven provider of e-commerce email marketing services.”

Retention Science Acquisition

Retention Science is located in Santa Monica, California. Under the terms of the definitive merger agreement, Endurance will acquire Retention Science for approximately $35.0 million, consisting of $17.5 million to be paid in cash upon close and the remaining $17.5 million to be paid in a combination of deferred consideration and earnouts over the next three years. The closing of the transaction is subject to customary closing conditions and is expected to close on or before August 15, 2020.

“We are excited to add the Retention Science team to Endurance and to our digital marketing business. The Retention Science platform allows us to complement our e-commerce capabilities following the acquisition of Ecomdash last year, and supports our strategic focus on investing to expand our total addressable market,” continued Mr. Fox.

Second Quarter 2020 Financial Highlights

As previously disclosed, the Company completed the sale of SinglePlatform on December 5, 2019. For year over year comparative purposes, selected figures presented below do not adjust for the sale of SinglePlatform unless noted.

Second Quarter 2020 Operating Highlights

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Fiscal 2020 Guidance

The Company is providing the following guidance as of the date of this release, July 30, 2020, which is consistent with guidance reintroduced in its release dated July 14, 2020. For the full year ending December 31, 2020, the Company expects:

In addition, for 2020 the Company expects cash flow from operations of $175 million and free cash flow of approximately $125 million.

Adjusted EBITDA and free cash flow are non-GAAP financial measures. The Company is unable to reconcile adjusted EBITDA guidance to GAAP without unreasonable efforts, as further discussed below in “Non-GAAP Financial Measures.”

Conference Call and Webcast Information

Endurance International Group’s second quarter 2020 financial results teleconference and webcast is scheduled to begin at 8:00 a.m. EDT on Thursday, July 30, 2020. To participate on the live call, analysts and investors should dial (888) 734-0328 at least ten minutes prior to the call. Endurance International Group will also offer a live and archived webcast of the conference call, accessible from the Investor Relations section of the Company’s website at http://ir.endurance.com.

Forward-Looking Statements

This press release includes certain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including statements about our guidance for fiscal year 2020, the closing, timing, and the anticipated benefits from the Retention Science acquisition, our belief that investments will increase the value delivered to our customers, and our expectations of future growth and financial and operational performance in general. These forward-looking statements include, but are not limited to, plans, objectives, expectations and intentions and other statements contained in this press release that are not historical facts, and statements identified by words such as “expects,” “believes,” “estimates,” “may,” “continue,” “positions,” “confident,” and variations of such words or words of similar meaning and the use of future dates. These forward-looking statements reflect our current views about our plans, intentions, expectations, strategies and prospects, which are based on the information currently available to us and on assumptions we have made. Although we believe that our plans, intentions, expectations, strategies and prospects as reflected in or suggested by those forward-looking statements are reasonable, we can give no assurance that these plans, intentions, expectations or strategies will be attained or achieved. Furthermore, actual results may differ materially from those described in the forward-looking statements and will be affected by a variety of risks and factors that are beyond our control including, without limitation: the possibility that the impact of the COVID-19 pandemic on the economy and our business will be different from or more

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extensive than we expect; the possibility that the Retention Science acquisition will not be completed; the possibility that the Retention Science acquisition or our other planned investment initiatives will not result in the anticipated benefits to our business; the possibility that we will be unable to maintain subscriber growth; an adverse impact on our business from litigation or regulatory proceedings or commercial disputes; an adverse impact on our business from our substantial indebtedness and the cost of servicing our debt; the rate of growth of the Small and Medium Business (“SMB”) market for our solutions or the impact of COVID-19 on that market; our inability increase sales to our existing subscribers or retain our existing subscribers; system or Internet failures; our inability to maintain or improve our competitive position or market share; and other risks and uncertainties discussed in our filings with the SEC, including those set forth under the caption “Risk Factors” in our Annual Report on Form 10-K for the period ended December 31, 2019 filed with the SEC on February 14, 2020 and in our Quarterly Report on Form 10-Q for the period ended March 31, 2020, filed with the SEC on May 6, 2020, and other reports we file with the SEC. We assume no obligation to update any forward-looking statements contained in this document as a result of new information, future events or otherwise.

About Endurance International Group

Endurance International Group Holdings, Inc. (NASDAQ:EIGI) helps millions of small businesses worldwide with products and technology to enhance their online web presence, email marketing, business solutions, and more. The Endurance family of brands includes: Constant Contact, Bluehost, HostGator and Domain.com, among others. Headquartered in Burlington, Massachusetts, Endurance employs approximately 3,600 people across the United States, Brazil, India and the Netherlands. For more information, visit: www.endurance.com.

Endurance International Group and the compass logo are trademarks of The Endurance International Group, Inc. Constant Contact, the Constant Contact logo and other brand names of Endurance International Group are trademarks of The Endurance International Group, Inc. or its subsidiaries.

Investor Contact:

Angela White

Endurance International Group

(781) 852-3450

ir@endurance.com

Press Contact:

Kristen Andrews

Endurance International Group

(781) 418-6716

press@endurance.com

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Non-GAAP Financial Measures

In addition to our financial information presented in accordance with GAAP, we use adjusted EBITDA and free cash flow, which are non-GAAP financial measures, to evaluate the operating and financial performance of our business, identify trends affecting our business, develop projections and make strategic business decisions. In this press release, we are also presenting the following additional non-GAAP financial measures for certain periods: revenue - excluding SinglePlatform and adjusted EBITDA - excluding SinglePlatform. A non-GAAP financial measure is a numerical measure of a company’s operating performance, financial position or cash flow that excludes amounts that are included in the most directly comparable measure calculated and presented in accordance with GAAP or includes amounts that are excluded from the most directly comparable measure calculated and presented in accordance with GAAP.

Our non-GAAP financial measures may not provide information that is directly comparable to that provided by other companies in our industry, as other companies in our industry may calculate non-GAAP financial results differently. In addition, there are limitations in using non-GAAP financial measures because they are not prepared in accordance with GAAP and exclude expenses that may have a material impact on our reported financial results. For example, adjusted EBITDA excludes interest expense, which has been and will continue to be for the foreseeable future a significant recurring expense in our business. The presentation of non-GAAP financial information is not meant to be considered in isolation from, or as a substitute for, the most directly comparable financial measures prepared in accordance with GAAP. We urge you to review the additional information about our non-GAAP measures shown below, including the reconciliations of these non-GAAP financial measures to their comparable GAAP financial measures, and not to rely on any single financial measure to evaluate our business.

Revenue - excluding SinglePlatform is a non-GAAP financial measure that we calculate as revenue excluding revenue contributed by our SinglePlatform business, which we sold on December 5, 2019. We believe that this measure helps investors evaluate and compare our past performance excluding the impact of a non-core business that we have sold.

Adjusted EBITDA is a non-GAAP financial measure that we calculate as net (loss) income, excluding the impact of interest expense (net), income tax expense (benefit), depreciation, amortization of other intangible assets, stock-based compensation, restructuring expenses, transaction expenses and charges, gain on sale of business, (gain) loss of unconsolidated entities, impairment of goodwill and other longlived assets, and shareholder litigation reserve. We view adjusted EBITDA as a performance measure and believe it helps investors evaluate and compare our core operating performance from period to period.

Adjusted EBITDA - excluding SinglePlatform is a non-GAAP financial measure that we calculate as adjusted EBITDA less adjusted EBITDA contributed by our SinglePlatform business, which we sold on December 5, 2019. Adjusted EBITDA contributed by our SinglePlatform business excludes the impact of corporate costs that we had allocated to SinglePlatform. We believe that this measure helps investors evaluate and compare our past performance excluding the impact of a non-core business that we have sold.

Free Cash Flow, or FCF, is a non-GAAP financial measure that we calculate as cash flow from operations less capital expenditures and financed equipment. We believe that FCF provides investors with an indicator of our ability to generate positive cash flows after meeting our obligations with regard to capital expenditures (including financed equipment).

Fiscal 2020 guidance included in this press release includes forward-looking guidance for adjusted EBITDA and FCF. A reconciliation of FCF guidance to cash flow from operations is included below. We are unable to reconcile our adjusted EBITDA guidance to net (loss) income because certain information necessary for this reconciliation is not available without unreasonable efforts since it is difficult to predict and/or dependent on future events that are outside of our control. In particular, we are unable to provide reasonable predictions of the following reconciling items: income tax expense (benefit), transaction expenses and charges, and impairment of goodwill and other long-lived assets. These items are difficult to predict with a reasonable degree of accuracy because of unanticipated changes in our GAAP effective income tax rate, a primary contributor to net (loss) income; uncertain or unanticipated acquisition costs; and unanticipated charges related to asset impairments. The impact of these items, in the aggregate, could be significant. With respect to the other reconciling items, as of the date of this press release, we expect the following for 2020 (all amounts are estimated, approximate, and subject to change): interest expense (net) of $123 million, depreciation expense of $50 million, amortization expense for other

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intangible assets of $70 million, and stock-based compensation expense of $38 million, restructuring expense of $2 million and gain on sale of assets of $(2) million. At this time, we do not expect expenses in 2020 for the remaining reconciling items. These forward-looking estimates of reconciling items may differ materially from our actual results and should not be relied upon as statements of fact.

Key Operating Metrics

Total Subscribers - We define total subscribers as the approximate number of subscribers that, as of the end of a period, are identified as subscribing directly to our products on a paid basis, excluding accounts that access our solutions via resellers or that purchase only domain names from us. Subscribers of more than one brand, and subscribers with more than one distinct billing relationship or subscription with us, are counted as separate subscribers. Total subscribers for a period reflects adjustments to add or subtract subscribers as we integrate acquisitions and/or are otherwise able to identify subscribers that meet, or do not meet, this definition of total subscribers. In the second quarter of 2020, these adjustments had a negative impact on total subscriber count of approximately 12,000.

Average Revenue Per Subscriber (ARPS) - We calculate ARPS as the amount of revenue we recognize in a period, including marketing development funds and other revenue not received from subscribers, divided by the average of the number of total subscribers at the beginning of the period and at the end of the period, which we refer to as average subscribers for the period, divided by the number of months in the period. See definition of “Total Subscribers” above. ARPS does not represent an exact measure of the average amount a subscriber spends with us each month, since our calculation of ARPS is impacted by revenues generated by non-subscribers.

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Endurance International Group Holdings, Inc.

Consolidated Balance Sheets

(in thousands, except share and per share amounts)

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Endurance International Group Holdings, Inc.

Consolidated Statements of Operations and Comprehensive Income (Loss)

(unaudited)

(in thousands, except share and per share amounts)

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Endurance International Group Holdings, Inc.

Consolidated Statements of Cash Flows

(unaudited)

(in thousands)

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GAAP to Non-GAAP Reconciliation - Adjusted EBITDA

The following table presents a reconciliation of net (loss) income calculated in accordance with GAAP to adjusted EBITDA (all data in thousands):

GAAP to Non-GAAP Reconciliation – Free Cash Flow

The following table reflects the reconciliation of cash flow from operations to free cash flow (“FCF”) (all data in thousands):

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Average Revenue Per Subscriber - Calculation and Segment Detail

We report our financial results in two segments - web presence and digital marketing.

The following table presents the calculation of ARPS, on a consolidated basis and by segment (all data in thousands, except ARPS data):

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The following table presents revenue, gross profit, and a reconciliation by segment of net (loss) income calculated in accordance with GAAP to adjusted EBITDA (all data in thousands):

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GAAP to Non-GAAP Reconciliation of Fiscal Year 2020 Guidance (as of July 30, 2020) - Free Cash Flow

The following table reflects the reconciliation of fiscal year 2020 estimated cash flow from operations calculated in accordance with GAAP to fiscal year 2020 guidance for free cash flow. All figures shown are approximate.

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