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Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

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What was announced?

We announced that our Board of Directors has unanimously approved an agreement under which Veritas Capital and Evergreen Coast Capital will acquire athenahealth for $5.7 billion in cash, or $135 per share.

We have decided to enter this agreement with Veritas because we believe it will provide significant value for our shareholders and new opportunities for our company, our clients and our employees.

The transaction is expected to close in the first quarter of 2019, subject to the approval of athenahealth shareholders representing a majority of the outstanding common stock of the company and the satisfaction of customary closing conditions and regulatory approvals.

Following the closing, Veritas and Evergreen expect to combine athenahealth with Virence Health, the GE Healthcare Value-based Care assets that Veritas acquired earlier this year.

The combined organization is expected to be a leading, privately-held healthcare information technology company with an extensive national provider network of customers and the world-class products and solutions to help them thrive in an increasingly complex environment.

The combined company is expected to operate under the athenahealth brand and be headquartered in Watertown, MA.

The company will be led by Virence Chairman and Chief Executive Officer Bob Segert and an executive leadership team comprised of executives from both companies.

Who is Veritas Capital?

Veritas Capital is a leading private equity firm that invests in companies that provide critical products and services, primarily technology and technology-enabled solutions, to government and commercial customers worldwide, including those operating in the aerospace and defense, healthcare, technology, national security, communications, energy, government services and education industries.

Veritas Capital has a proven track record of driving growth for companies within the healthcare IT space, as illustrated by the firm’s acquisition of Verscend Technologies and its combination with Cotiviti Holdings, as well as the firm’s investment in Truven Health Analytics.

Veritas has a deep understanding of the urgent need to digitize our healthcare system and brings a culture of intense customer focus and a drive for growth through focused R&D and product innovation.

Additional information about Veritas can be found at www.veritascapital.com.

Who is Evergreen Coast Capital?

Evergreen Coast Capital is an affiliate of Elliott Management Corporate, focused on technology investing.

Evergreen has also made similar investments in other cloud-based technology companies, including BMC Software, an IT and cloud solutions company, and Gigamon, an IT security company, helping to drive long-term growth and success.

What will be Evergreen’s/Elliott’s role with athenahealth after the close of the transaction?

Through its affiliate, Evergreen Coast Capital, Elliott will be a shareholder in athenahealth.

Who is Virence Health?

Virence Health Technologies, the GE Healthcare Value-based Care assets that Veritas acquired earlier this year, is a leading software provider that leverages technology and analytics to help healthcare providers across the continuum of care effectively manage their financial, clinical, and human capital workflows.

Offering a comprehensive suite of innovative technology-enabled solutions, Virence aims to improve quality, increase efficiency, and reduce waste in the healthcare industry.

Additional information about Virence can be found at www.virencehealth.com.

Who is Bob Segert? What is his background?

Bob Segert is the chairman and CEO of Virence Health. He took over leadership at Virence in September of 2018, bringing with him more than 20 years of leadership experience in the software & IT services industry, spanning across sales, marketing, corporate strategy, M&A, operations and general management. Bob has spent the last decade transforming private-equity-backed companies into market leaders by focusing on delivering outstanding customer outcomes. He most recently served as Executive Chairman of Aspect Software, a global provider of contact center and workforce optimization software and solutions. Immediately prior to Aspect, Bob served as President and CEO of Expert Global Solutions, growing the business to 43,000+ employees and achieving leadership positions in customer relationship management and financial care BPO services. Prior to his time at Expert Global Solutions, Mr. Segert served as President and CEO of GXS, Inc., the world’s largest B2B cloud integration platform connecting 550,000+ businesses through a common transaction processing eco-system. Bob has also served in executive roles at Electronic Data Systems and as a consultant at A.T. Kearney. Mr. Segert holds an MBA from Harvard Business School and a BS in Mechanical Engineering from Purdue University.

How quickly will athenahealth be combined with Virence?

As stated in the release, following the close, Veritas and Evergreen expect to combine athenahealth with Virence Health.

Specific details on integrating the organizations will be shared when they are known, as appropriate. What we know today is that once the companies are combined, the organization is expected to operate under the athenahealth brand and be headquartered in Watertown, MA.

The company will be led by Virence Chairman and Chief Executive Officer Bob Segert and an executive leadership team comprised of executives from both companies.

What does it mean to become a private company?

Becoming a private company means that, upon completion of the transaction, our stock will no longer be listed or traded on NASDAQ, and we will cease to be an SEC reporting company.

We believe combining with Virence will create new opportunities for collaboration and growth.

As a privately operated company with the right partners, we believe that athenahealth will have more flexibility to focus on unleashing our collective potential to transform healthcare.

Thus, while our ownership structure is changing, our mission and dedication to our clients and employees remains the same.

What approvals are needed to complete the transaction? What’s the timeline to close?

The transaction is expected to close in the first quarter of 2019.

It is subject to:

The athenahealth Board of Directors has unanimously approved entering into the merger agreement and intends to recommend that athenahealth shareholders vote in favor of it at a Special Meeting of Stockholders, to be scheduled as soon as practicable.

The transaction is not subject to a financing condition.

Will there be a vote on this transaction by shareholders? When and how?

The transaction is subject to the approval of athenahealth shareholders representing a majority of the outstanding common stock of the company.

The athenahealth Board of Directors has unanimously approved the merger agreement and intends to recommend that athenahealth shareholders vote in favor of it.

The Special Meeting of Stockholders will be scheduled as soon as practicable.

What does this transaction mean for athenahealth employees? Our culture and mission?

Fundamentally, this transaction is about building on the many great attributes that have made athenahealth an industry leader.

Veritas has a proven track record of driving growth for companies within the healthcare IT space.

They and Virence are passionate about athenahealth’s mission and committed to supporting innovation.

Moreover, athenahealth and Virence have complementary cultures and portfolios, and highly-talented people. Together, we believe we can expand our depth and reach across the continuum of care. We believe there will be multiple opportunities for athenistas to dream big and execute.

As our combined company succeeds together, we expect it to lead to new opportunities for our employees as well.

What happens to the year-end appraisals and bonuses?

We are continuing to operate under our current compensation and benefits programs.

Year-end appraisals and bonuses will continue as planned.

Will employees receive 2019 equity grants as part of the annual performance review?

athena does not expect to grant equity incentive awards to employees in 2019 as part of the 2018 performance year appraisal process, in part because we expect to close the acquisition before the typical March grant date.

In the event that we are not closed by March 7, 2019, athena may grant cash-based incentive awards to employees who would have otherwise received equity incentive awards in 2019 in recognition of 2018 performance, consistent with our past practice. These cash-based incentive awards would be subject to similar terms and conditions as our historic equity incentive awards to employees.

Will the transaction impact employee compensation?

Until December 31, 2019, Veritas will provide continuing employees with two things: first, a base salary or wage and target annual cash bonus opportunities that are no less favorable in each case than provided by athena as of the closing date, and second, employee benefits that are substantially comparable in the aggregate to those provided to similarly situated employees of Virence Health.

athena and Virence Health are committed to working together to build a strong, vibrant combined company. athena and Virence Health believe that providing employees with competitive total compensation packages is vitally important to motivating and retaining employees, as well as attracting the best new talent. While the exact design of employee compensation arrangements is under review, such arrangements will promote strong employee engagement and the long-term growth of the combined company.

How will equity be treated upon closing the transaction?

Common Stock: Each share of common stock will be converted into the right to receive $135 per share, in cash.

Stock Options: Holders of vested and unvested options, with an exercise price less than $135, will receive $135 minus the applicable exercise price of each option, multiplied by the number of shares subject to the option. Any options with an exercise price higher than $135 will be cancelled for no consideration.

Restricted Stock Units: Holders of vested and unvested restricted stock units will receive a lump sum cash payment equal to $135 multiplied by the number of shares underlying your restricted stock units.

Performance Restricted Stock Units: Performance restricted stock units (whether vested or unvested) for which the period during which the performance vesting requirement is measured has been completed prior to the closing, will receive cash equal to the number of shares subject to the performance RSU that would vest based on the actual level of achievement of the performance measures, multiplied by $135. Performance restricted stock units (whether vested or unvested) for which the period during which the performance vesting requirement is measured has not been completed prior to the closing, will receive cash equal to the number of shares subject to the performance RSU that would vest based on the target level of achievement, multiplied by $135.

How will my contributions under the Employee Stock Purchase Plan (ESPP) be treated?

The current offering period under the ESPP will continue until shortly prior to the closing of the merger, however, if the merger closes after March 31, 2019 (which is the last scheduled date of the current offering period), the ESPP will terminate on that date. There will be no further offering periods under the ESPP after such time. For the current offering period, participants may not increase the percentage of their payroll deductions and no employees who are not currently participating in the ESPP can join the plan. On the last day of the current offering period (whether it is March 31, 2018 or earlier), the participant’s accumulated payroll deductions will be used to purchase shares of the Company under the plan.

Will any members of athenahealth’s senior leadership team be leaving following the close of the transaction?

Following the close, the company will be led by Virence Chairman and Chief Executive Officer Bob Segert and an executive leadership team comprised of executives from both companies.

Details on the combined executive leadership team will be finalized in the future.

Will there be any changes in reporting relationships or job responsibilities as a result of the transaction?

We are operating as usual through the closing of this transaction.

We expect to shortly begin working with Veritas and Virence on plans to bring our organizations together and would expect reporting relationships and the overall organizational structure to be part of that work.

We will share more information as it is available.

Will the Company maintain its headquarters in Watertown?

Yes, following the close, the combined organization is expected to be headquartered in Watertown, MA.

Will we maintain our current office locations? Will there be any facility closings as a result of the transaction?

We do not currently expect changes to athenahealth’s operating locations or facilities as a result of the transaction.

Following the close, the combined organization is expected to be headquartered in Watertown, MA.

As always, we will continue to ensure our operating footprint best meets the needs of the business and our customers.

Will there be any changes to the athenahealth name and brand?

Following the close of the transaction, the combined company is expected to operate under the athenahealth brand.

Can employees notify customers?

Customers received a letter from Jeff Immelt announcing the news. Key clients also received calls from our executives on the day of the announcement.

It is important that we maintain a consistent message and a unified, coordinated approach with our customers, Unorganized outreach to customers about this transaction is prohibited.

To the extent that you feel additional customer outreach is necessary, please contact Bret Connor first, who will work to provide the support you need.

To the extent customers contact you with questions or comments, please take note of these conversations and report them to Bret Connor. In those customer conversations, please emphasize that:

What do employees do if they are contacted by media or other third parties?

Consistent with usual policies:

Where can I learn more about the transaction?

Keep in mind, the transaction was just announced so, consistent with deals of this nature, there are many details that we do not have yet and that still need to be worked out.

This information will continue to be updated as more information becomes available, as appropriate. Following the company meeting, we will publish a link for submitting questions regarding the announcement.

Details are available in our SEC filings, including the press release, the merger agreement (both filed with the SEC on a Form 8-K on 11/13/18) and will be available in the Company’s proxy statement that will be filed in the coming weeks in connection with the Special Meeting of Stockholders to approve the transaction.

We will continue to keep you updated as there is more information to share.