EXHIBIT 99.1

FOR FURTHER INFORMATION CONTACT:

Investor Relations 847-607-2012

Conference call to be held July 28, 2016 4:00 p.m. Central time – Dial 866-516-6872 at least 5 minutes before start time. If you are unable to participate on the call, a replay will be available through August 28th by dialing 855-859-2056, access code 21516790. To hear a live simulcast of the call or access the audio archive, visit the investor relations page on www.stericycle.com.

STERICYCLE, INC. REPORTS RESULTS

FOR THE SECOND QUARTER AND YEAR TO DATE 2016

Lake Forest, Illinois, July 28, 2016—Stericycle, Inc. (NASDAQ:SRCL), today reported financial results for the second quarter and year to date 2016.

SECOND QUARTER RESULTS

Revenues for the quarter ended June 30, 2016 were $891.6 million, up 24.6% from $715.7 million in the second quarter of last year. Acquisitions contributed approximately $185.9 million to the current period’s growth in revenues. Revenues increased 27.4% compared to the prior period when adjusted for unfavorable foreign exchange impacts of $20.0 million. Organic revenues grew 1.4%, or 3.3% when adjusted for manufacturing and industrial services. See Tables 1A-1C below.

Gross profit, reported in accordance with U.S. generally accepted accounting principles (“GAAP”), was $381.1 million, up 25.0% from $304.8 million in the second quarter of last year. GAAP gross profit as a percentage of revenue was 42.7% compared to 42.6% in the second quarter of 2015. Non-GAAP gross profit, when adjusted for plant conversion expenses as identified in Table 2 below, was $381.6 million, an increase of 25.0% from $305.3 million in the second quarter of last year. Non-GAAP gross profit as a percentage of revenues was 42.8% compared to 42.7% in the second quarter of 2015.

GAAP earnings per diluted share decreased 57.3% to $0.43 from $1.02 in the second quarter of 2015. Non-GAAP earnings per diluted share, when adjusted for various items, decreased 1.6% to $1.18 from $1.20. See Tables 3 and 4 below.

FIRST SIX MONTHS RESULTS

Revenues for the six months ended June 30, 2016 were $1.77 billion, up 28.0% from $1.38 billion in the same period last year. Acquisitions contributed approximately $380.4 million to the current year’s growth in revenues. Revenues increased 31.2% compared with the prior period when adjusted for unfavorable foreign exchange impact of $43.8 million. Organic revenues grew 3.7%, or 5.2% when adjusted for manufacturing and industrial services. See Tables 1A-1C below.

GAAP gross profit was $750.3 million, up 28.0% from $586.2 million in the same period last year. GAAP gross profit as a percentage of revenues remained flat at 42.5% for the six months ended June 30, 2016 and 2015. Non-GAAP gross profit, when adjusted for plant conversion expenses as identified in Table 2 below, was $751.0 million, up 28.0% from $586.7 million in the same period as last year. Non-GAAP gross profit as a percentage of revenues remained flat at 42.5% for the six months ended June 30, 2016 and 2015.

GAAP earnings per diluted share decreased 10.5% to $1.21 from $1.35 in 2015. Non-GAAP earnings per diluted share, when adjusted for various items, decreased 1.7% to $2.29 from $2.33. See Tables 3 and 4 below.

Cash flow from operations for the six months ended June 30, 2016 was $245.4 million, up 37.4% from $178.7 million in the same period last year.

PRESENTATION OF NON-GAAP INFORMATION

This press release includes certain non-GAAP financial measures, as defined in the SEC’s Regulation G. The Company reports its financial results in compliance with GAAP, but believes that also discussing non-GAAP financial measures allows for a better period over period comparison by removing the impact of items that, in management’s view, do not reflect the Company’s underlying operating performance. These measures are also used to evaluate senior management and are a factor in determining their at-risk compensation.

Adjusted diluted earnings per share, adjusted net income, adjusted gross profit, and adjusted sales growth are described in the Reconciliation of Certain Non-GAAP Measures section of this document.

These non-GAAP financial measures should not be considered in isolation or as a substitute for GAAP financial results, but should be read in conjunction with the unaudited condensed consolidated statement of income and other information presented herein. The non-GAAP financial measures in the press release may differ from similar measures used by other companies. A reconciliation of each non-GAAP financial measure to the most directly comparable GAAP measure is included in the accompanying tables.

DISCUSSION OF ADJUSTING ITEMS FOR NON-GAAP MEASURES

For the purpose of evaluating revenues, we present non-GAAP revenues to show the impact of foreign currency, revenues from acquisitions and Manufacturing and Industrial Services (“M&I”). Management reviews and analyzes revenues excluding the effect of foreign currency translation and revenue from acquisitions because we believe this better represents the Company’s underlying business trends, including organic revenue growth. Separate presentation of M&I allows for visibility of a revenue stream that has shown greater volatility than our other service lines.

For the purpose of evaluating operating performance, we present our financials to show the impact of income and expenses in our non-GAAP earnings related to acquisitions. These adjustments include acquisition expense, integration expense, amortization expense, and change in fair value of contingent consideration. This allows comparison of period over period results without the impact of acquisitions-related expenses.

For the purpose of evaluating operating performance, we additionally present our financials to show the impact of expenses in our non-GAAP earnings related to litigation expense, restructuring and plant conversion expenses, and contract exit costs to allow for period over period comparison of financials without the impact of charges that may not occur each year and if so, are due to different factors.

For the purpose of calculating the ultimate impact of our mandatory convertible preferred stock, we show the impact to our EPS by excluding the mandatory convertible preferred stock dividend and using the “if-converted” method of share dilution. This provides the reader insight to how our diluted shares will be affected after these preferred shares are converted to common shares.

RECONCILIATION OF CERTAIN NON-GAAP MEASURES

The following tables show our reconciliation of GAAP Revenue growth to Non-GAAP Revenue growth:

Table 1 - A

Table 1 - B

Table 1 - C

The following table shows our reconciliation of GAAP Gross Profit to Non-GAAP Gross Profit:

Table 2

The following tables show our reconciliation of GAAP Net Income Attributable to Stericycle, Inc. Common Shareholders to Non-GAAP Net Income Attributable to Stericycle, Inc. Common Shareholders:

Table 3

The following table shows our reconciliation of GAAP EPS to Non-GAAP EPS:

Table 4

For more information about Stericycle, please visit our website at www.stericycle.com.

Safe Harbor Statement: This press release may contain forward-looking statements that involve risks and uncertainties, some of which are beyond our control (for example, general economic and market conditions). Our actual results could differ significantly from the results described in the forward-looking statements. Factors that could cause such differences include changes in governmental regulation of the collection, transportation, treatment and disposal of regulated waste or the proper handling and protection of personal and confidential information, increases in transportation and other operating costs, the level of governmental enforcement of regulations governing regulated waste collection and treatment or the proper handling and protection of personal and confidential information, our obligations to service our substantial indebtedness and to comply with the covenants and restrictions contained in our private placement notes, term loan credit facility and revolving credit facility, our ability to execute our acquisition strategy and to integrate acquired businesses, competition and demand for services in the regulated waste and secure information destruction industries, political, economic and currency risks related to our foreign operations, impairments of goodwill or other indefinite-lived intangibles, variability in the demand for services we provide on a project or non-recurring basis, exposure to environmental liabilities, fluctuations in the price we receive for the sale of paper, disruptions in or attacks on our information technology systems, compliance with existing and future legal and regulatory requirements, as well as other factors described in our filings with the U.S. Securities and Exchange Commission, including our most recently filed Annual Report on Form 10-K. As a result, past financial performance should not be considered a reliable indicator of future performance, and investors should not use historical trends to anticipate future results or trends. We make no commitment to disclose any subsequent revisions to forward-looking statements.

STERICYCLE, INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(IN THOUSANDS)

STERICYCLE, INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(IN THOUSANDS, EXCEPT SHARES AND PER SHARE DATA)

STERICYCLE, INC. AND SUBSIDIARIES

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(IN THOUSANDS)