AmerisourceBergen Corporation 1 West First Avenue Conshohocken, PA 19428 AMERISOURCEBERGEN REPORTS FISCAL 2021 THIRD QUARTER RESULTS Revenues of $53.4 billion for the Third Quarter, a 17.7 Percent Increase Year-Over-Year

AMERISOURCEBERGEN REPORTS

FISCAL 2021 THIRD QUARTER RESULTS

Revenues of $53.4 billion for the Third Quarter, a 17.7 Percent Increase Year-Over-Year

Third Quarter GAAP Diluted EPS of $1.40 and Adjusted Diluted EPS of $2.16

Adjusted Diluted EPS Guidance Range Raised to $9.15 to $9.30 for Fiscal 2021

CONSHOHOCKEN, PA, August 4, 2021 - AmerisourceBergen Corporation (NYSE ABC) today reported that in its fiscal year 2021 third quarter ended June 30, 2021, revenue increased 17.7 percent year-over-year to $53.4 billion. On the basis of U.S. generally accepted accounting principles (GAAP), diluted earnings per share (EPS) was $1.40 for the June quarter of fiscal 2021, compared to $1.41 in the prior year quarter. Adjusted diluted EPS, which is a non-GAAP measure that excludes items described below, increased 16.8 percent to $2.16 in the fiscal third quarter.

AmerisourceBergen is updating its outlook for fiscal year 2021. The Company does not provide forward-looking guidance on a GAAP basis, as discussed below in Fiscal Year 2021 Expectations. Adjusted diluted EPS guidance has been raised from the previous range of $8.90 to $9.10 to a range of $9.15 to $9.30, reflecting growth of 16 percent to 18 percent versus the previous fiscal year.

During the third quarter, AmerisourceBergen continued to capitalize on our differentiated, pharmaceutical-centric value proposition and successfully executed on our key strategic initiatives including completing the acquisition of Alliance Healthcare, said Steven H. Collis, Chairman, President and Chief Executive Officer of AmerisourceBergen. We are proud of the execution by our teams to deliver these results and pleased to increase financial guidance for fiscal 2021 to reflect the continued strong performance across our businesses.

AmerisourceBergen's purpose-driven teams continue to provide critical pharmaceutical distribution services and innovative pharmaceutical services to customers across our global footprint, Mr. Collis continued. By providing differentiated value to our stakeholders, focusing on our customers, expanding on our leadership in specialty distribution, and executing, innovating, and supporting pharmaceutical innovation globally, we are well positioned to create long-term stakeholder value as we remain united in our responsibility to create healthier futures.

Third Quarter Fiscal Year 2021 Summary Results

Below, AmerisourceBergen presents descriptive summaries of the Company's GAAP and adjusted (non-GAAP) quarterly results. In the tables that follow, GAAP results and GAAP to non-GAAP reconciliations are presented. For more information related to non-GAAP financial measures, including adjustments made in the periods presented, please refer to the Supplemental Information Regarding non-GAAP Financial Measures following the tables.

Third Quarter GAAP Results

Revenue In the third quarter of fiscal 2021, revenue was $53.4 billion, up 17.7 percent compared to the same quarter in the previous fiscal year, reflecting a 13.2 percent increase in Pharmaceutical Distribution Services revenue and a 128.0 percent increase in revenue within Other primarily driven by the June 2021 acquisition of Alliance Healthcare.

Gross Profit Gross profit in the third quarter of fiscal 2021 was $1.9 billion, a 54.0 percent increase compared to the same period in the previous fiscal year. Gross profit was favorably impacted by increases in gross profit in Pharmaceutical Distribution Services and Other, a LIFO credit in the current year quarter in comparison to a LIFO expense in the prior year quarter and increases in gains from antitrust litigation settlements. Gross profit as a percentage of revenue was 3.54%, an increase of 84 basis points from the prior year quarter primarily driven by the acquisition of Alliance Healthcare, an increase in sales of specialty products in Pharmaceutical Distribution Services and growth in some of the Company's higher margin businesses.

Operating Expenses In the third quarter of fiscal 2021, operating expenses were $1,267.5 million, a 54.4 percent increase compared to the same period last fiscal year. The increase in operating expenses was primarily due to the acquisition of Alliance Healthcare and a $124.3 million accrual related to opioid settlement discussions. Operating expenses as a percentage of revenue in the fiscal 2021 third quarter were 2.37 percent, compared to 1.81 percent for the same period in the previous fiscal year primarily due to the items mentioned above.

Operating Income In the fiscal 2021 third quarter, operating income increased to $620.7 million from $404.8 million. Operating income as a percentage of revenue was 1.16 percent in the third quarter of fiscal 2021, compared to 0.89 percent for the same period in the previous fiscal year primarily due to the acquisition of Alliance Healthcare and growth in some of the Company's higher margin businesses.

Interest Expense, Net In the fiscal 2021 third quarter, net interest expense of $51.3 million was up 36.0 percent versus the prior year quarter due to the issuance of debt to finance a portion of the acquisition of Alliance Healthcare.

Effective Tax Rate The effective tax rate was 48.5 percent for the third quarter of fiscal 2021 primarily due to tax reform in the United Kingdom. This compares to 16.5 percent in the prior year quarter, which was favorably impacted by a discrete tax benefit.

Diluted Earnings Per Share Diluted earnings per share was $1.40 in the third quarter of fiscal 2021 compared to $1.41 in the previous fiscal year's third quarter.

Diluted Shares Outstanding Diluted weighted average shares outstanding for the third quarter of fiscal 2021 were 208.9 million, a 1.6 percent increase versus the prior fiscal year third quarter resulting from stock option exercises,

restricted stock vesting, and the issuance of 2 million Company shares to Walgreens for the June 2021 acquisition of Alliance Healthcare.

Third Quarter Adjusted (non-GAAP) Results

Revenue No adjustments were made to the GAAP presentation of revenue. In the third quarter of fiscal 2021, revenue was $53.4 billion, up 17.7 percent compared to the same quarter in the previous fiscal year, reflecting a 13.2 percent increase in Pharmaceutical Distribution Services revenue and an 128.0 percent increase in revenue within Other primarily driven by the June 2021 acquisition of Alliance Healthcare.

Adjusted Gross Profit Adjusted gross profit in the fiscal 2021 third quarter was $1.6 billion, which was up 32.0 percent compared to the same period in the previous fiscal year due to the Alliance Healthcare acquisition and increases in gross profit in Pharmaceutical Distribution Services and Other. Adjusted gross profit as a percentage of revenue was 3.05 percent in the fiscal 2021 third quarter, an increase of 33 basis points when compared to the prior year quarter primarily driven by the Alliance Healthcare acquisition, an increase in sales of specialty products in Pharmaceutical Distribution Services and growth in some of the Company's higher margin businesses.

Adjusted Operating Expenses In the third quarter of fiscal 2021, adjusted operating expenses were $996.2 million, an increase of 37.5 percent compared to the same period in the previous fiscal year due to the acquisition of Alliance Healthcare and an increase in payroll-related operating costs to support the Company's current and future revenue growth. Adjusted operating expenses as a percentage of revenue in the fiscal 2021 third quarter was 1.87 percent, an increase of 27 basis points when compared to the prior year quarter primarily due to the acquisition of Alliance Healthcare.

Adjusted Operating Income In the fiscal 2021 third quarter, adjusted operating income of $630.6 million increased 24.3 percent from the prior year quarter due to a 13.4 percent increase in Pharmaceutical Distribution Services' operating income and a 77.2 percent increase in operating income within Other. Adjusted operating income as a percentage of revenue was 1.18 percent in the fiscal 2021 third quarter, an increase of 6 basis points when compared to the prior year quarter due to the Alliance Healthcare acquisition and growth in higher margin businesses.

Interest Expense, Net No adjustments were made to the GAAP presentation of net interest expense. In the fiscal 2021 third quarter, net interest expense of $51.3 million was up 36.0 percent versus the prior year quarter due to the issuance of debt to finance a portion of the acquisition of Alliance Healthcare.

Adjusted Effective Tax Rate The adjusted effective tax rate was 21.0 percent for the third quarter of fiscal 2021 compared to 18.8 percent in the prior year quarter, which benefited from a discrete tax item.

Adjusted Diluted Earnings Per Share Adjusted diluted earnings per share was up 16.8 percent to $2.16 in the third quarter of fiscal 2021 compared to $1.85 in the previous fiscal year's third quarter, driven by the increase in adjusted operating income and partially offset by higher interest expense, a higher effective tax rate, and a higher diluted share count.

Diluted Shares Outstanding No adjustments were made to the GAAP presentation of diluted shares outstanding. Diluted weighted average shares outstanding for the third quarter of fiscal 2021 were 208.9 million, a 1.6 percent increase versus the prior fiscal year third quarter resulting from stock option exercises, restricted stock vesting, and the issuance of 2 million Company shares to Walgreens for the June 2021 acquisition of Alliance Healthcare.

The Company's operations are comprised of the Pharmaceutical Distribution Services reportable segment and other operating segments that are not significant enough to require separate reportable segment disclosure and, therefore, have been included in Other for the purpose of the reportable segment presentation. Other consists of operating segments that focus on global commercialization services, animal health (MWI Animal Health or MWI ), and international pharmaceutical wholesale and related service operations (Alliance Healthcare). The operating segments that focus on global commercialization services include AmerisourceBergen Consulting Services ( ABCS ) and World Courier.

Pharmaceutical Distribution Services Segment

Pharmaceutical Distribution Services revenue was $49.3 billion in the third quarter of fiscal 2021, an increase of 13.2 percent compared to the same quarter in the prior fiscal year primarily due to increased sales of specialty products, including COVID-19 treatments, and overall market growth. Segment operating income of $483.9 million in the third quarter of fiscal 2021 was up 13.4 percent compared to the same period in the previous fiscal year as a result of strong performance across our distribution businesses including increased sales of specialty products.

Revenue in Other was $4.1 billion in the third quarter of fiscal 2021, an increase of 128.0 percent compared to the same period in the prior fiscal year primarily due to the acquisition of Alliance Healthcare and growth in the other operating segments MWI, World Courier, and ABCS. Operating income in Other increased 77.2 percent to $146.9 million in the third quarter of fiscal 2021 primarily due to the acquisition of Alliance Healthcare and growth at MWI and World Courier.

Recent Company Highlights Milestones

AmerisourceBergen announced the completion of its acquisition of the majority of Walgreens Boots Alliance's Alliance Healthcare businesses. The acquisition extends AmerisourceBergen's pharmaceutical distribution presence and global platform of manufacturer services to support pharmaceutical innovation.

Good Neighbor Pharmacy, AmerisourceBergen's national independent pharmacy network, announced that it has been ranked "Highest in Customer Satisfaction with Chain Drug Store Pharmacies" in the J.D. Power 2020 U.S. Pharmacy Study. This marks the tenth time that Good Neighbor Pharmacy has earned the achievement in the last 12 years.

AmerisourceBergen was named 8th on the 2021 DiversityInc Philanthropy list. Launched in 2001, the survey is the most comprehensive, data-driven D I analysis of some of the largest U.S. employers. The assessment collects data across six key areas Leadership Accountability, Human Capital Diversity Metrics, Talent Programs, Workforce Practices, Supplier Diversity, and Philanthropy.

Fiscal Year 2021 Expectations

The Company does not provide forward-looking guidance on a GAAP basis as certain financial information, the probable significance of which cannot be determined, is not available or cannot be reasonably estimated. Please refer to the Supplemental Information Regarding Non-GAAP Financial Measures following the tables for additional information.

Fiscal Year 2021 Expectations on an Adjusted (non-GAAP) Basis

In June 2021, AmerisourceBergen updated its fiscal year 2021 financial guidance for revenue, adjusted diluted EPS and weighted average shares following the closing of the Alliance Healthcare acquisition to reflect the expected contribution from Alliance Healthcare and the weighted average share count impact of the 2 million shares of AmerisourceBergen common stock that the Company delivered to Walgreens at the closing of the transaction.

AmerisourceBergen is now updating its fiscal year 2021 financial guidance to reflect the Company's continued strong performance across its businesses. The Company now expects

Adjusted Diluted EPS to be in the range of $9.15 to $9.30, raised from the previous range of $8.90 to $9.10.

Additional expectations now include

Adjusted operating expense to be approximately $3.9 billion, up from growth in the high-single digit percent range

Adjusted operating income to be approximately $2.6 billion, up from growth in the high-single digit percent range

Pharmaceutical Distribution Services operating income growth to be in the low-double digit percent range, up from growth in the high-single digit percent range

Other, which is comprised of Alliance Healthcare and the Global Commercialization Services Animal Health businesses, operating income to be approximately $610 to $620 million, up from growth in the low-double digit percent range and

Adjusted free cash flow to be approximately $1.7 billion, up from approximately $1.5 billion.

All other previously communicated aspects of the Company's fiscal year 2021 financial guidance and assumptions remain the same.

Dividend Declaration

The Company's Board of Directors declared a quarterly cash dividend of $0.44 per common share, payable September 7, 2021, to stockholders of record at the close of business on August 16, 2021.

On July 21, 2021, AmerisourceBergen announced that it and the two other national pharmaceutical distributors have negotiated a comprehensive proposed settlement agreement that, if all conditions are satisfied, would result in the resolution of a substantial majority of opioid lawsuits filed by state and local governmental entities.

Conference Call Slide Presentation

The Company will host a conference call to discuss the results at 8 30 a.m. ET on August 4, 2021. A slide presentation for investors has also been posted on the Company's website at investor.amerisourcebergen.com. Participating in the conference call will be

Steven H. Collis, Chairman, President Chief Executive Officer

James F. Cleary, Executive Vice President Chief Financial Officer

The dial-in number for the live call will be (844) 808-6694. From outside the United States, dial +1 (412) 317-5282. No access code is required. The live call will also be webcast via the Company's website at investor.amerisourcebergen.com. Users are encouraged to log on to the webcast approximately 10 minutes in advance of the scheduled start time of the call.

Replays of the call will be made available via telephone and webcast. A replay of the webcast will be posted on investor.amerisourcebergen.com approximately one hour after the completion of the call and will remain available for one year. The telephone replay will also be available approximately one hour after the completion of the call and will remain available for seven days. To access the telephone replay from within the U.S., dial (877) 344-7529. From Canada, dial +1 (855) 669-9658. From outside the United States and Canada, dial +1 (412) 317-0088. The access code for the replay is 10157948.

About AmerisourceBergen

AmerisourceBergen fosters a positive impact on the health of people and communities around the world by advancing the development and delivery of pharmaceuticals and healthcare products. As a leading global healthcare company, with a foundation in pharmaceutical distribution and solutions for manufacturers, pharmacies and providers, we create unparalleled access, efficiency and reliability for human and animal health. Our 41,000 global team members power our purpose We are united in our responsibility to create healthier futures. AmerisourceBergen is ranked #8 on the Fortune 500 with more than $200 billion in annual revenue. Learn more at investor.amerisourcebergen.com.

AmerisourceBergen's Cautionary Note Regarding Forward-Looking Statements

Certain of the statements contained in this press release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the Securities Exchange Act ). Words such as expect, likely, outlook, forecast, would, could, should, can, project, intend, plan, continue, sustain, synergy, on track, believe, seek, estimate, anticipate, may, possible, assume, variations of such words, and similar expressions are intended to identify such forward-looking statements. These statements are based on management's current expectations and are subject to uncertainty and changes in circumstances and speak only as of the date hereof. These statements are not guarantees of future performance and are based on assumptions and estimates that could prove incorrect or could cause actual results to vary materially from those indicated. Among the factors that could cause actual results to differ materially from those projected, anticipated, or implied are the following unfavorable trends in brand and generic pharmaceutical pricing, including in rate or frequency of price inflation or deflation competition and industry consolidation of both customers and suppliers resulting in increasing pressure to reduce prices for our products and services changes in the United States healthcare and regulatory environment, including changes that could impact prescription drug reimbursement under Medicare and Medicaid increasing governmental regulations regarding the pharmaceutical supply channel declining reimbursement rates for pharmaceuticals continued federal and state government enforcement initiatives to detect and prevent suspicious orders of controlled substances and the diversion of controlled substances continued prosecution or suit by federal, state and other governmental entities of alleged violations of laws and regulations regarding controlled substances, including due to failure to achieve a global resolution of the multi-district opioid litigation and other related state court litigation, and any related disputes, including shareholder derivative lawsuits increased federal scrutiny and litigation, including qui tam litigation, for alleged violations of laws and regulations governing the marketing, sale, purchase and or dispensing of pharmaceutical products or services, and associated reserves and costs failure to comply with the Corporate Integrity Agreement material adverse resolution of pending legal proceedings the retention of key customer or supplier relationships under less favorable economics or the adverse resolution of any contract or other dispute with customers or suppliers changes to customer or supplier payment terms, including as a result of the COVID-19 impact on such payment terms the integration of the Alliance Healthcare business into the Company being more difficult, time consuming or costly than expected the Company's or Alliance Healthcare's failure to achieve expected or targeted future financial and operating performance and results the effects of disruption from the acquisition and related strategic transactions on the respective businesses of the Company and Alliance Healthcare and the fact that the acquisition and related strategic transactions may make it more difficult to establish or maintain relationships with employees, suppliers and other business partners the acquisition of businesses, including the acquisition of the Alliance Healthcare businesses and related strategic transactions, that do not perform as expected, or that are difficult to integrate or control, or the inability to capture all of the anticipated synergies related thereto or to capture the anticipated synergies within the expected time period risks associated with the strategic, long-term relationship between Walgreens Boots Alliance, Inc. and the Company, including with respect to the pharmaceutical distribution agreement and or the global generic purchasing services arrangement managing foreign expansion, including non-compliance with the U.S. Foreign Corrupt Practices Act, anti-bribery laws, economic sanctions and import laws and regulations financial market volatility and disruption changes in tax laws or legislative initiatives that could adversely affect the Company's tax positions and or the Company's tax liabilities or adverse resolution of challenges to the Company's tax positions substantial defaults in payment, material reduction in purchases by or the loss, bankruptcy or insolvency of a major customer, including as a result of COVID-19 the loss, bankruptcy or insolvency of a major supplier, including as a result of COVID-19 financial and other impacts of COVID-19 on our operations or business continuity changes to the customer or supplier mix malfunction, failure or breach of sophisticated information systems to operate as designed risks generally associated with data privacy regulation and the international transfer of personal data natural disasters or other unexpected events, such as additional pandemics, that affect the Company's operations the impairment of goodwill or other intangible assets (including any additional impairments with respect to foreign operations), resulting in a charge to earnings the Company's ability to manage and complete divestitures the disruption of the Company's cash flow and ability to return value to its stockholders in accordance with its past practices interest rate and foreign currency exchange rate fluctuations declining economic conditions in the United States and abroad and other economic, business, competitive, legal, tax, regulatory and or operational factors affecting the Company's business generally. Certain additional factors that management believes could cause actual outcomes and results to differ materially from those described in forward-looking statements are set forth (i) in Item 1A (Risk Factors), in the Company's Annual Report on Form 10-K for the fiscal year ended September 30, 2020 and elsewhere in that report and (ii) in other reports filed by the Company pursuant to the Securities Exchange Act. The Company undertakes no obligation to publicly update or revise any forward-looking statements, except as required by the federal securities laws.

AMERISOURCEBERGEN CORPORATION

(In thousands, except per share data)

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1 Includes a $113.9 million LIFO credit and a $147.4 million gain from antitrust litigation settlements in the three months ended June 30, 2021. Includes a $6.1 million LIFO expense in the three months ended June 30, 2020.

2 Includes $12.5 million of PharMEDium shutdown costs in the three months ended June 30, 2020.

3 Includes a $6.7 million of employee severance, a $124.3 million legal accrual related to our proposed opioid litigation settlement, $28.9 million of litigation costs related to legal fees in connection with opioid lawsuits and investigations, and $67.0 million of other costs in connection with acquisition-related deal and integration costs, business transformation efforts, and other restructuring initiatives in the three months ended June 30, 2021. Includes $6.5 million of employee severance, $31.4 million of litigation costs related to legal fees in connection with opioid lawsuits and investigations, and $20.7 million of other costs in connection with business transformation efforts, acquisition-related deal and integration costs, and other restructuring initiatives in the three months ended June 30, 2020.

4 Includes $6.2 million of income on the currency remeasurement of deferred tax assets relating to Swiss tax reform in the three months ended June 30, 2021.

5 Includes $127.6 million of expense relating to UK tax reform and $9.0 million of expense relating to Swiss tax reform in the three months ended June 30, 2021.

AMERISOURCEBERGEN CORPORATION

(In thousands, except per share data)

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1 Includes a $160.6 million LIFO credit and a $147.4 million gain from antitrust litigation settlements in the nine months ended June 30, 2021. Includes a $43.2 million LIFO expense, $12.6 million of PharMEDium remediation and shutdown costs, and an $8.5 million gain from antitrust litigation settlements in the nine months ended June 30, 2020.

2 Includes $49.0 million of PharMEDium remediation and shutdown costs and a $12.2 million adjustment to Profarma's estimate of contingent consideration related to the purchase price of one of its prior business acquisitions in the nine months ended June 30, 2020.

3 Includes $6.7 million of employee severance, a $141.4 million legal accrual related to our proposed opioid litigation settlement, $85.9 million of litigation costs related to legal fees in connection with opioid lawsuits and investigations, and $141.5 million of other costs in connection with acquisition-related deal and integration costs, business transformation efforts, and other restructuring initiatives in the nine months ended June 30, 2021. Includes $32.4 million of employee severance, $86.9 million of litigation costs related to legal fees in connection with opioid lawsuits and investigations, and $46.4 million of other costs in connection with business transformation efforts, other restructuring initiatives, and acquisition-related deal and integration costs in the nine months ended June 30, 2020.

4 Includes a $1.1 million expense on the currency remeasurement of deferred tax assets relating to Swiss tax reform in the nine months ended June 30, 2021.

5 Includes $127.6 million of expense relating to UK tax reform, $64.0 million of expense relating to Swiss tax reform, and a $20.4 million adjustment of discrete tax benefits primarily attributable to the income tax deductions resulting from the permanent shutdown of the PharMEDium business in the nine months ended June 30, 2021. Includes $741.0 million of discrete tax benefits primarily attributable to the income tax deductions resulting from the shutdown of the PharMEDium business in the nine months ended June 30, 2020.

AMERISOURCEBERGEN CORPORATION

GAAP TO NON-GAAP RECONCILIATIONS

(in thousands, except per share data)

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1 Includes a $124.3 million legal expense accrual related to our proposed opioid litigation settlement.

2 Includes $127.6 million of expense relating to UK tax reform, $9.0 million of expense relating to Swiss tax reform, and $6.2 million of income on the currency remeasurement of the related deferred tax assets, which is recorded within Other (Income) Loss.

3 The sum of the components does not equal the total due to rounding.

Note For more information related to non-GAAP financial measures, refer to the section titled Supplemental Information Regarding Non-GAAP Financial Measures of this release.

AMERISOURCEBERGEN CORPORATION

GAAP TO NON-GAAP RECONCILIATIONS

(in thousands, except per share data)

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