Exhibit 99

PATTERSON COMPANIES REPORTS FISCAL 2019 SECOND-QUARTER RESULTS

St. Paul, Minn. — December 6, 2018 — Patterson Companies, Inc. (Nasdaq: PDCO) today reported consolidated net sales of approximately $1.4 billion (see attached Sales Summary for further details) in its fiscal second quarter ended October 27, 2018, an increase of 1.4 percent compared to the same period last year. Internal sales, which are adjusted for the effects of currency translation and changes in product selling relationships, increased 1.8 percent.

Reported net income attributable to Patterson Companies, Inc. for the second quarter of fiscal year 2019 was $28.9 million, or $0.31 per diluted share, compared to net income attributable to Patterson Companies, Inc. of $40.2 million, or $0.43 per diluted share, in last year’s fiscal second quarter. Adjusted net income¹ attributable to Patterson Companies, Inc., which excludes deal amortization costs and integration and business restructuring costs, totaled $36.3 million for the second quarter of fiscal 2019, or $0.39 per diluted share, compared to $47.6 million in the same quarter last year, or $0.51 per diluted share. The reported net income and the adjusted net income attributable to Patterson Companies, Inc. were both impacted by the decrease in operating margins within the Dental segment.

“Our second quarter results met our expectations and we continue to make progress on our focused initiatives to improve performance and build a stronger Patterson,” said Mark Walchirk, president and CEO of Patterson Companies. “While we still have much work ahead, our team has delivered two consecutive quarters of year-over-year revenue growth, operating margin improvement from the fiscal first quarter and continued strong cash flow generation. As a result, we are reaffirming our fiscal 2019 guidance.”

Patterson Animal Health

Reported net sales in our Animal Health segment for the second quarter of fiscal 2019, which comprised approximately 61 percent of the company’s total sales, were $855.4 million compared to $823.6 million in the same quarter last year. Internal sales for the segment increased 4.5 percent from the fiscal 2018 second quarter.

Patterson Dental

Reported net sales in our Dental segment for the second quarter of fiscal 2019, which represented approximately 39 percent of total company sales, were $542.5 million compared to $553.6 million in the same quarter last year. Internal sales declined 1.8 percent compared to the fiscal 2018 second quarter.

Balance Sheet and Capital Allocation

For the first six months of fiscal 2019, Patterson Companies generated $200.2 million of cash from operating activities and collected deferred purchase price receivables of $165.6 million for a total of $365.8 million, compared to a total of $101.7 million in the same period last year. During the first six months of fiscal 2019, debt has been reduced by $196.3 million and cash has grown by $102.5 million.

In the second quarter of fiscal 2019, Patterson Companies paid $24.7 million in cash dividends to shareholders. On a year-to-date basis, Patterson has returned $50.0 million in cash dividends to shareholders.

Year-to-Date Results

Consolidated net sales for the first six months of fiscal 2019 totaled $2.7 billion, a 1.9 percent year-over-year increase. Reported net income attributable to Patterson Companies, Inc. was $24.4 million, or $0.26 per diluted share, compared to $71.1 million, or $0.76 per diluted share in last year’s period. In July 2018, Patterson Companies booked a pre-tax reserve of $28.3 million for the anticipated settlement of purported class action antitrust litigation.

Adjusted net income¹ attributable to Patterson Companies, Inc., which excludes deal amortization costs, integration and business restructuring costs and legal reserve costs, totaled $60.3 million, or $0.65 per diluted share, compared to adjusted net income of $89.0 million, or $0.95 per diluted share, in the year-ago period.

FY2019 Guidance

Patterson Companies today reaffirmed fiscal 2019 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 potential future acquisitions or similar transactions, if any, or impairments and material restructurings beyond those previously publicly disclosed. Our guidance assumes North American and international market conditions similar to those experienced in fiscal 2018.

¹Non-GAAP Financial Measures

The Reconciliation of GAAP to non-GAAP Measures table appearing behind the accompanying financial information is provided to adjust reported GAAP measures, namely operating income, income before taxes, income tax expense, net income, net income attributable to Patterson Companies, Inc. and diluted earnings per share attributable to Patterson Companies, Inc., for the impact of deal amortization, integration and business restructuring expenses and legal reserve costs along with the related tax effects of these items.

Management believes that these non-GAAP measures may provide a helpful representation of the company’s second-quarter performance and earnings guidance, and enable comparison of financial results between periods where certain items may vary independent of business performance. These non-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.

In addition, the term “internal sales” used in this release represents net sales adjusted to exclude foreign currency impact and changes in product selling relationships. Foreign currency impact represents the difference in results that is attributable to 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 results translated 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 information to investors in light of significant fluctuations in currency rates.

Second-Quarter Conference Call and Replay

Patterson Companies’ fiscal 2019 second-quarter earnings conference call will start at 10 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 replay of the fiscal 2019 second-quarter conference call can be heard for one week at 800-585-8367 and by providing the Conference ID 5359197 when prompted.

About Patterson Companies Inc.

Patterson Companies Inc. (Nasdaq: PDCO) is a value-added distributor serving the dental and animal health markets.

Dental Market

Patterson’s Dental segment provides a virtually complete range of consumable dental products, equipment and software, turnkey digital solutions and value-added services to dentists and dental laboratories throughout North America.

Animal Health Market

Patterson’s Animal Health segment is a leading distributor of products, services and technologies to both the production and companion animal health markets in North America and the U.K.

This press release contains certain forward-looking statements, as defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements are information of a non-historical nature and are subject to risks and uncertainties that are beyond Patterson’s ability to control. Forward-looking statements generally can be

identified by words such as “believes,” “expects,” “anticipates,” “foresees,” “forecasts,” “estimates” or other words or phrases of similar import. It is uncertain whether any of the events anticipated by the forward-looking statements will transpire or occur, or if any of them do, what impact they will have on the results of operations and financial condition of Patterson or the price of Patterson stock. These forward-looking statements involve certain risks and uncertainties that could cause actual results to differ materially from those indicated in such forward-looking statements. Such risks and uncertainties include, without limitation, operations disruptions attributable to our enterprise resource planning system implementation; our ability to attract or retain qualified sales representatives and service technicians who relate directly with our customers; the reduction, modification, cancellation or delay of purchases of innovative, high-margin equipment; material changes in our purchasing relationships with suppliers; changes in general market and economic conditions; and the other risks and important factors contained and identified in Patterson’s filings with the Securities and Exchange Commission, such as its Quarterly Reports on Form 10-Q and Annual Reports on Form 10-K, any of which could cause actual results to differ materially from the forward-looking statements. Any forward-looking statement in this press release speaks only as of the date on which it is made. Except to the extent required under the federal securities laws, Patterson does not intend to update or revise the forward-looking statements.

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PATTERSON COMPANIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share amounts)

(Unaudited)

PATTERSON COMPANIES, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

(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.

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)