Exhibit 99

PATTERSON COMPANIES REPORTS FISCAL 2022

SECOND-QUARTER OPERATING RESULTS

St. Paul, Minn. —December 1, 2021 — Patterson Companies, Inc. (Nasdaq: PDCO) today reported consolidated net sales of $1.65 billion (see attached Sales Summary for further details) in its fiscal second quarter ended October 30, 2021, an increaseof 6.2 percent compared to the same period last year. Internal sales, which are adjusted for the effects of currency translation, changes in product selling relationships and contributions from recent acquisitions, increased 8.3 percentover the prior year.

Reported net income attributable to Patterson Companies, Inc. for the second quarter of fiscal 2022 was $48.3 million, or $0.49 perdiluted share, compared to $54.1 million, or $0.56 per diluted share, in the second quarter of fiscal 2021. Adjusted net income¹ attributable to Patterson Companies, Inc., which excludes dealamortization and integration and business restructuring expenses, totaled $57.1 million for the second quarter of fiscal 2022, or $0.58 per diluted share, compared to $61.1 million in the same quarter of fiscal 2021, or $0.63 per dilutedshare. The year-over-year decline in reported and adjusted net income attributable to Patterson Companies, Inc. is primarily due to lower expenses in the prior year period associated with COVID-19. Theyear-over-year decline was partially offset by strong sales performance in the Animal Health segment during the second quarter of fiscal 2022.

“Our top andbottom line results during the second quarter and first half of fiscal 2022 reflect the strong focus and execution of our team and that our value proposition continues to resonate with our customers,” said Mark Walchirk, President and CEO ofPatterson Companies. “Given our momentum and confidence in the business, we are increasing our adjusted EPS guidance range for fiscal 2022. We remain focused on leveraging the combined strength of Patterson’s team, strategy and deep valueproposition to serve our customers, accelerate our growth and drive long-term value creation.”

Patterson Dental

Reported net sales in our Dental segment for the second quarter of fiscal 2022, which represented approximately 38 percent of total company sales, were$622.2 million. Internal sales decreased 2.0 percent compared to the fiscal 2021 second quarter, including a 0.8 percent decline in consumables and a 3.0 percent decline in equipment and software. Compared to the pre-pandemic period of the second quarter of fiscal 2020, internal sales increased 9.8 percent, including 16.7 percent growth in consumables and 2.3 percent growth in equipment and software.

Patterson Animal Health

Reported net sales in our Animal Health segment forthe second quarter of fiscal 2022, which comprised approximately 62 percent of the company’s total sales, were $1.0 billion. Internal sales growth of 16.2 percent was driven by continued strong performance in companion animal andadditional recovery in production animal and included 15.8 percent growth in consumables and 37.8 percent growth in equipment and software. Compared to the pre-pandemic period of the second quarterof fiscal 2020, internal sales increased 24.3 percent, including 23.5 percent growth in consumables and 72.6 percent growth in equipment and software.

Balance Sheet and Capital Allocation

During the first six months of fiscal 2022, Patterson Companies used $539.0 million of cash from operating activities and collected deferred purchase pricereceivables of $585.6 million, generating $46.6 million in cash, compared to a use of cash of $14.1 million during the first six months of fiscal 2021. Free cash flow¹ (seedefinition below and attached free cash flow table) during the first six months of fiscal 2022 improved by $59.6 million compared to the fiscal 2021 period due to a decreased level of working capital during fiscal 2022.

In the second quarter of fiscal 2022, Patterson Companies declared a quarterly cash dividend of $0.26 per share and returned $25.3 million in cash dividends toshareholders. Through the first six months of fiscal 2022, Patterson Companies has returned $50.4 million in cash dividends to shareholders.

Year-to-Date Results

Consolidated reported net sales for the first six months offiscal 2022 totaled $3.3 billion, a 16.6 percent year-over-year increase. Sales in the first six months of fiscal 2022 reflected an extra week of sales results in the fiscal first quarter versus the prior year. Internal sales, which areadjusted for the effects of currency translation, changes in product selling relationships, contributions from recent acquisitions and the extra week of selling results in the first quarter of fiscal 2022, increased 13.9 percent compared to thefirst six months of fiscal 2021. Through the first six months of fiscal 2022, Dental segment internal sales increased 10.8 percent, including 13.8 percent growth in consumables and 8.2 percent growth in equipment and software. Throughthe first six months of fiscal 2022, Animal Health segment internal sales increased 16.4 percent, including 15.7 percent growth in consumables and 42.7 percent growth in equipment and software.

Reported net income attributable to Patterson Companies, Inc. was $82.3 million, or $0.84 per diluted share, compared to a $78.5 million, or $0.82 per dilutedshare in last year’s period. Adjusted net income¹ attributable to Patterson Companies, Inc., which excludes gains on investments, inventory donation charges, deal amortization, legal reservesand integration and business restructuring expenses totaled $99.2 million, or $1.01 per diluted share, compared to adjusted net income attributable to Patterson Companies, Inc. of $92.6 million, or $0.96 per diluted share, in the year-ago period.

Fiscal 2022 Guidance

Patterson Companies today updated its fiscal 2022 earnings guidance, which is provided on both a GAAP and non-GAAP adjusted1 basis:

Our guidance is for current operations as well as completed or previously announced acquisitions and does not include the impact of potentialfuture acquisitions, dispositions or similar transactions, if any, or impairments and material restructurings beyond those previously publicly disclosed. Our guidance assumes North American and international market conditions remain consistent withcurrent market conditions and that there are no material adverse developments associated with the pandemic.

¹Non-GAAP FinancialMeasures

The Reconciliation of GAAP to non-GAAP Measures table appearing behind the accompanying financial informationis provided to adjust reported GAAP measures, namely operating income, other income (expense), net, income before taxes, income tax expense, net income, net income attributable to Patterson Companies, Inc. and diluted earnings per share attributableto Patterson Companies, Inc., for the impact of gains on investments, inventory donation charges, deal amortization, legal reserves and integration and business restructuring expenses along with the related tax effects of these items.

The term “free cash flow” used in this release is defined as net cash used in operating activities less capital expenditures plus the collection of deferredpurchase price receivables.

In addition, the term “internal sales” used in this release represents net sales adjusted to exclude the impact of foreigncurrency, changes in product selling relationships, contributions from recent acquisitions and the extra week of selling results in the first quarter of fiscal 2022. Foreign currency impact represents the difference in results that is attributableto fluctuations in currency exchange rates the company uses to convert results for all foreign entities where the functional currency is not the U.S. dollar. The company calculates the impact as the difference between the current period resultstranslated using the current period currency exchange rates and using the comparable prior period’s currency exchange rates. The company believes the disclosure of net sales changes in constant currency provides useful supplementary informationto investors in light of fluctuations in currency rates.

Management believes that these non-GAAP measures may provide ahelpful representation of the company’s second-quarter performance and enable comparison of financial results between periods where certain items may vary independent of business performance. Thesenon-GAAP financial measures are presented solely for informational and comparative purposes and should not be regarded as a replacement for corresponding, similarly captioned, GAAP measures.

Second-Quarter Conference Call and Replay

Patterson Companies’ fiscal2022 second-quarter conference call will start at 8:30 a.m. Eastern today. Investors can listen to a live webcast of the conference call at www.pattersoncompanies.com. The conference call will be archived on the Patterson Companies website. A replayof the fiscal 2022 second-quarter conference call can be heard for one week at 1-800-770-2030 and by providing the Conference ID73285 when prompted.

About Patterson Companies Inc.

Patterson CompaniesInc. (Nasdaq: PDCO) connects dental and animal health customers in North America and the U.K. to the latest products, technologies, services and innovative business solutions that enable operational and professional success. Ourcomprehensive portfolio, distribution network and supply chain is equaled only by our dedicated, knowledgeable people who deliver unrivalled expertise and unmatched customer service and support.

Learn more: pattersoncompanies.com

This press release contains, and our officersand representatives may from time to time make, certain “forward-looking statements” within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, including statements regarding futurefinancial performance, and the objectives and expectations of management. Forward-looking statements often include words such as “believes,” “expects,” “anticipates,” “estimates,” “intends,”“plans,” “seeks” or words of similar meaning, or future or conditional verbs, such as “will,” “should,” “could” or “may.”

Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based only on our current beliefs, expectations andassumptions regarding the future of our business, future plans and strategies, projections, anticipated events and trends, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherentuncertainties, risks and changes in

circumstances that are difficult to predict and many of which are outside of our control. Our actual results and financial condition may differ materially from those indicated in theforward-looking statements. Therefore, you should not place undue reliance on any of these forward-looking statements.

Any number of factors could affect ouractual results and cause such results to differ materially from those contemplated by any forward-looking statements, including, but not limited to, the following: the COVID-19 pandemic and measurestaken in response thereto; our dependence on relationships with sales representatives and service technicians to retain customers and develop business; potential disruption of distribution capabilities, including service issues with third-partyshippers; our dependence on suppliers to manufacture and supply substantially all of the products we sell; the risk of the products we sell becoming obsolete or containing undetected errors; adverse changes in supplier rebates; the risk that privatelabel sales could adversely affect our relationships with suppliers; our dependence on positive perceptions of Patterson’s reputation; risks inherent in acquiring and disposing of assets or other businesses and the risks inherent in integratingacquired businesses; our ability to comply with restrictive covenants in our credit agreement; our dependence on leadership development and succession planning; the risk that our governing documents and Minnesota law may discourage takeovers andbusiness combinations; the effects of the highly competitive and consolidating dental and animal health supply markets in which we compete; exposure to the risks of the animal production business, including changing consumer demand, the cyclicallivestock market, and other factors outside our control; risks from the formation of GPOs, provider networks and buying groups that may shift purchasing decisions and place us at a competitive disadvantage; increasesin over-the-counter sales and e-commerce options for companion animal products or sales of companion animalproducts from non-veterinarian sources; change and uncertainty in the health care industry, including the effects of health care reform; failure to comply with existing or future U.S. or foreign laws andregulations including those governing the distribution of pharmaceuticals and controlled substances; public concern over the abuse of opioid medication in the U.S.; failure to comply with health care fraud or other laws and regulations; litigationrisks, including the diversion of management’s attention, the cost of defending against such actions, the possibility of damage awards or settlements, fines or penalties, or equitable remedies (including but not limited to the revocation of or non-renewal of licenses) and inherent uncertainty; failure to comply with evolving data privacy laws and regulations; tax legislation; the risks inherent in international operations, including currencyfluctuations; risks associated with information systems and cyber-security attacks; disruptions from our enterprise resource planning system; and the risk of being required to record significant impairment charges if our Dental segment’sgoodwill or other intangible assets become impaired.

The order in which these factors appear should not be construed to indicate their relative importance orpriority. We caution that these factors may not be exhaustive, accordingly, any forward-looking statements contained herein should not be relied upon as a prediction of actual results.

You should carefully consider these and other relevant factors, including those risk factors in Part I, Item 1A, (“Risk Factors”) in our most recent Form 10-K and information which may be contained in our other filings with the U.S. Securities and Exchange Commission, or SEC, when reviewing any forward-looking statement.

Investors should understand it is impossible to predict or identify all such factors or risks. As such, you should not consider the foregoing list, or the risksidentified in our SEC filings, to be a complete discussion of all potential risks or uncertainties.

Any forward-looking statement made by us in this press releaseis based only on information currently available to us and speaks only as of the date on which it is made. We do not undertake any obligation to release publicly any revisions to any forward-looking statements whether written or oral, that may bemade from time to time, whether as a result of new information, future developments or otherwise.

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PATTERSON COMPANIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share amounts)

(Unaudited)

PATTERSON COMPANIES, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Inthousands)

(Unaudited)

PATTERSON COMPANIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

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(Unaudited)

PATTERSON COMPANIES, INC.

SALES SUMMARY

(Dollars in thousands)

(Unaudited)

PATTERSON COMPANIES, INC.

OPERATING INCOME BY SEGMENT

(In thousands)

(Unaudited)

PATTERSON COMPANIES, INC.

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

(Dollars in thousands, except per share amounts)

(Unaudited)

PATTERSON COMPANIES, INC.

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

(Dollars in thousands, except per share amounts)

(Unaudited)

PATTERSON COMPANIES, INC.

FREE CASH FLOW

(In thousands)

(Unaudited)