Exhibit 99.1

FOR IMMEDIATE RELEASE

A. SCHULMAN REPORTS FISCAL 2011 THIRD-QUARTER RESULTS

AKRON, Ohio – July 6, 2011 – A. Schulman, Inc. (Nasdaq-GS: SHLM) announced today earnings for the fiscal 2011 third quarter ended May 31, 2011. The Company reported net income for the third quarter of $18.8 million, or $0.60 per diluted share, compared with net income of $25.8 million, or $0.91 per diluted share, for the comparable period last year. The translation effect of foreign currencies was $1.1 million favorable for the quarter.

The fiscal 2011 third-quarter net income per diluted share of $0.60 included certain after-tax items of approximately $1.5 million, or $0.05 per diluted share, primarily related to restructuring and acquisition-related costs. Excluding these items, net income for the fiscal 2011 third quarter was $20.3 million, or $0.65 per diluted share, compared with $13.6 million, or $0.48 per diluted share, for the prior-year period. The fiscal 2010 third-quarter net income per diluted share of $0.91 included certain after-tax net benefits of approximately $12.2 million, which were primarily related to a tax valuation allowance release as part of the April 30, 2010 acquisition of ICO, Inc. which was partially offset by asset impairments, acquisition-related costs and restructuring expenses.

“Gross profit and operating income improved from a year ago in each of our three regions as our efforts to focus on a higher-margin product mix continue to bear fruit in the Americas, Europe and Asia,” said Joseph M. Gingo, Chairman, President and Chief Executive Officer. “We continue to see opportunities to expand our presence in high-value-added products in the current economic environment which will position us well to serve the needs of our customers.”

Net sales for the fiscal 2011 third quarter were $611.1 million, an increase of 45.4% compared with $420.3 million for the same period last year. The translation effect of foreign currencies increased sales by $33.6 million in the quarter. The majority of the increase was due to the impact of the acquisition of ICO, Inc., which was completed during the third quarter of fiscal 2010. Volume reached 535.4 million pounds, up 28% from 418.3 million pounds reported last year. Had the Company owned ICO at the beginning of fiscal 2010, sales growth would have been approximately 25% quarter-over-quarter, and volume growth would have been approximately flat.

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Gross profit for the quarter was $78.9 million, compared with $58.9 million last year. Foreign currency translation favorably impacted gross profit by $4.5 million. Overall gross profit per pound, including certain items, was 14.7 cents, compared with 14.1 cents for the same period last year. Had the Company owned ICO at the beginning of fiscal 2010, gross profit for the 2011 third quarter would have been approximately $7.1 million higher. Had the Company owned ICO at the beginning of fiscal 2010, gross profit per pound would have improved by approximately 8% from the comparable period in fiscal 2010.

The Company’s selling, general and administrative expenses, excluding the effect of foreign currency translation, increased $5.6 million for the quarter. Had the Company owned ICO at the beginning of fiscal 2010 and excluding costs related to acquisitions, selling, general and administrative expenses would have increased $2.5 million for the quarter. The increase is primarily the result of increases in global headcount as a result of the ICO acquisition and an unfavorable foreign currency impact partially offset by a $1.2 million reduction in bad debt expense and a $2.7 million decrease in bonus expense.

For the first nine months of fiscal 2011, the Company reported net income of $35.1 million, or $1.12 per diluted share, compared with net income of $36.0 million, or $1.34 per diluted share, for the same period last year. Excluding the effect of certain items including asset impairments, acquisition-related costs and restructuring-related charges, year-to-date net income was $43.0 million compared with $36.5 million a year ago. Volume increased by 45% for the nine-month period compared with the prior-year period, primarily due to the ICO acquisition. Had the Company owned ICO at the beginning of fiscal 2010, sales would have increased approximately 19% and volume would have increased approximately 3%.

Note: The numbers below will sometimes refer to the Company’s performance including the “ICO effect”. The Company defines the “ICO effect” as if it had owned ICO at the beginning of fiscal 2010. These are non-GAAP presentations developed as a result of the way the Company is internally measuring the business. The results exclude certain charges and acquisition-related items discussed above and include a consistent amount of purchasing accounting-related depreciation and amortization expense for each period. See the attached financial table (Non-GAAP Supplemental Segment Comparison Information) for non-GAAP supplemental financial information by business segment.

Europe, Middle East and Africa (“EMEA”) – The EMEA business segment’s performance improved in the fiscal 2011 third quarter. EMEA sales for the quarter were $436.0 million, an increase of 43% compared with the prior-year period. The foreign currency translation effect favorably impacted sales by $29.9 million. Including the ICO effect, sales would have increased approximately 29% as a result of successfully passing on the raw material price increases in most business lines. Average selling prices would have increased approximately 30% compared with the prior year including the ICO effect.

EMEA gross profit was $54.7 million for the fiscal 2011 third quarter, an increase from $47.3 million for the same three-month period last year. Gross profit per pound was 16.2 cents per pound in the quarter, compared with 15.6 cents per pound last year. Foreign currency translation favorably impacted EMEA gross profit by $4.0 million. Including the ICO effect, gross profit would have increased approximately $3.0 million, or approximately 6%, and gross profit per pound would have increased approximately 6% compared with the fiscal 2010 third quarter. During the quarter, the Company was able to effectively pass along cost increases with the exception of some fixed price

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contracts in its engineered plastics business where some price increases have lagged the raw material market.

Operating income for EMEA during the fiscal 2011 third quarter was $25.7 million, an increase of $3.4 million compared with last year. Including the ICO effect, operating income would have increased approximately $1.9 million. The increase in operating income in fiscal 2011 was due to the increase in gross profit partially offset by an increase of $1.2 million in selling, general and administrative expenses.

The Americas – In the fiscal 2011 third quarter, sales for the Americas were $137.9 million, an increase of $45.3 million, or 49%, compared with the prior-year period. Foreign currency translation increased sales by $2.6 million. Including the ICO effect, sales would have increased approximately 17% for the three-month period. Volume for the quarter was 164.6 million pounds, which would have been an increase of approximately 5% from the prior-year quarter, including the ICO effect. Sales increased as the Company was able to pass on raw material price increases. The volume increase was a result of improvements in the masterbatch business line.

Gross profit for the Americas was $19.4 million for the fiscal 2011 third quarter, an increase of $7.9 million from the comparable period last year. Gross profit per pound was 11.8 cents per pound in the quarter, compared with 12.2 cents per pound in the prior year. Including the ICO effect, gross profit would have increased approximately $3.3 million, or approximately 21%, and gross profit per pound would have increased approximately 15% for the fiscal 2011 third quarter. The increases in gross profit and gross profit per pound were primarily due to effectively managing margins in light of raw material costs.

Operating income for the Americas for the fiscal 2011 third quarter was $4.9 million compared with $2.0 million last year. The $2.9 million increase in profitability was primarily due to an increase in gross profit based on higher volumes. Including the ICO effect, operating income would have increased approximately $0.5 million and selling, general and administrative expenses would have increased approximately $2.8 million due primarily to increased headcount.

Asia Pacific (“APAC”) – Sales for APAC for the fiscal 2011 third quarter were $37.2 million, an increase of $14.3 million compared with the prior-year period. Including the ICO effect, sales would have increased approximately 10%. Sales increased compared with the prior year driven by strong customer demand throughout the APAC segment except Australia, where the Company has previously announced a restructuring of its capacity due to the declining water tank market.

Gross profit for the quarter was $4.8 million, or 14.7 cents per pound, an increase of $2.1 million compared with last year. Including the ICO effect, gross profit would have increased approximately $0.7 million and gross profit per pound would have increased approximately 20%, primarily due to higher sales margins in the masterbatch businesses in China, Malaysia and Indonesia, again offset by the market decline in Australia as noted above.

Operating income for the quarter was $1.7 million compared with $0.8 million last year. Including the ICO effect, operating profit would have increased by approximately $1.3 million. The increase in profitability was due to improved gross profits and a decrease of $0.6 million in selling, general and administrative expenses compared with the prior year.

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Cash Flow From Operations/Working Capital/Share Repurchase

Net cash used in operations was $6.0 million and $25.0 million for the nine months ended May 31, 2011 and 2010, respectively. For the nine months ended May 31, 2010, net income was impacted by a $19.5 million non-cash benefit from the reversal of tax valuation allowance in the U.S. related to the ICO acquisition.

The Company’s net debt, defined as total debt less cash and cash equivalents, was in a net debt position of $98.7 million, an improvement from $102.4 million as of the end of the second quarter but an increase from $31.9 million at August 31, 2010. The key drivers of the year-to-date increase were acquisition costs, dividend payments, share repurchases and working capital needs to support the sales and volume growth.

The Company has repurchased 662,900 shares of its common stock at an average price of $21.91 per share during fiscal 2011. Shares valued at approximately $99.1 million remain authorized for repurchase as of May 31, 2011.

Business Outlook

Based upon year-to-date results, the Company reaffirms its fiscal 2011 net income guidance in the range of $57 million to $62 million. The guidance assumes a euro exchange rate of $1.35.

“The guidance range reflects our current view of customer demand, and our commitment to delivering upon our global growth strategies. While we are confident with this range, we proceed with a sense of caution given the continuous flow of outside economic data that is signaling global economic softness as we approach our next fiscal year. The uncertainty in the nature and timing of this softness leads us to view the lower end of our range with a higher degree of confidence,” Gingo stated.

Conference Call on the Web

A live Internet broadcast of A. Schulman’s conference call regarding fiscal 2011 third-quarter earnings can be accessed at 10:00 a.m. Eastern time on Thursday, July 7, 2011, on the Company’s website, www.aschulman.com. An archived replay of the call will also be available on the website.

About A. Schulman, Inc.

Headquartered in Akron, Ohio, A. Schulman is a leading international supplier of high-performance plastic compounds and resins. These materials are used in a variety of consumer, industrial, automotive and packaging applications. The Company employs about 3,000 people and has 33 manufacturing facilities in North America, South America, Europe and Asia. A. Schulman reported net sales of $1.6 billion for the fiscal year ended August 31, 2010. Additional information about A. Schulman can be found at www.aschulman.com.

Use of Non-GAAP Financial Measures

This release includes certain financial information determined by methods other than in accordance with accounting principles generally accepted in the United States (“GAAP”). These non-GAAP financial measures include: net income excluding certain items, net income per diluted share excluding certain items and EBITDA excluding certain items, as well as certain non-GAAP supplemental segment comparison financial information reflecting the operations of A. Schulman, Inc. (the “Company”) as if it owned ICO, Inc. (“ICO”) at the beginning of the first quarter of 2010. However, non-GAAP measures are not in accordance with, nor are they a substitute for, GAAP measures, and tables included in this release reconcile each non-GAAP financial measure with the most directly comparable GAAP financial measure. The most directly

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comparable GAAP financial measures for these purposes are income from continuing operations before taxes, net income and net income per diluted share. The Company’s non-GAAP financial measures are not meant to be considered in isolation or as a substitute for comparable GAAP financial measures, and should be read only in conjunction with the Company’s consolidated financial statements prepared in accordance with GAAP.

The Company uses these non-GAAP financial measures to monitor and evaluate Company performance and believes that they are useful to investors for financial analysis, particularly with respect to understanding the significance of the ICO acquisition in the third quarter of fiscal 2010. However, the non-GAAP supplemental financial information is not necessarily indicative of what the combined financial results would have actually been had the ICO acquisition taken place as of September 1, 2009, since such financial information does not reflect any cost savings, operating synergies, tax synergies or revenue enhancements, and includes certain estimated additional depreciation amounts and estimates for amortization of the intangibles recorded as part of the purchase price allocation.

While the Company believes that these non-GAAP financial measures provide useful supplemental information to investors, there are very significant limitations associated with their use. These non-GAAP financial measures are not prepared in accordance with GAAP, may not be reported by all of the Company’s competitors and may not be directly comparable to similarly titled measures of the Company’s competitors due to potential differences in the exact method of calculation. The Company compensates for these limitations by using these non-GAAP financial measures as supplements to GAAP financial measures and by reviewing the reconciliations of the non-GAAP financial measures to their most comparable GAAP financial measures.

Cautionary Note on Forward-Looking Statements

A number of the matters discussed in this document that are not historical or current facts deal with potential future circumstances and developments and may constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by the fact that they do not relate strictly to historic or current facts and relate to future events and expectations. Forward-looking statements contain such words as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” and other words and terms of similar meaning in connection with any discussion of future operating or financial performance. Forward-looking statements are based on management’s current expectations and include known and unknown risks, uncertainties and other factors, many of which management is unable to predict or control, that may cause actual results, performance or achievements to differ materially from those expressed or implied in the forward-looking statements. Important factors that could cause actual results to differ materially from those suggested by these forward-looking statements, and that could adversely affect the Company’s future financial performance, include, but are not limited to, the following:

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The risks and uncertainties identified above are not the only risks the Company faces. Additional risk factors that could affect the Company’s performance are set forth in the Company’s Annual Report on Form 10-K. In addition, risks and uncertainties not presently known to the Company or that it believes to be immaterial also may adversely affect the Company. Should any known or unknown risks or uncertainties develop into actual events, or underlying assumptions prove inaccurate, these developments could have material adverse effects on the Company’s business, financial condition and results of operations. This document contains time-sensitive information that reflects management’s best analysis only as of the date of this document. The Company does not undertake an obligation to publicly update or revise any forward-looking statements to reflect new events, information or circumstances, or otherwise. Further information concerning issues that could materially affect financial performance related to forward-looking statements can be found in the Company’s periodic filings with the Securities and Exchange Commission.

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Contact information:

Jennifer K. Beeman

Director of Corporate Communications & Investor Relations

A. Schulman, Inc.

3550 W. Market St.

Akron, Ohio 44333

Tel: 330-668-7346

email: Jennifer_Beeman@us.aschulman.com

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A. SCHULMAN, INC.

CONSOLIDATED STATEMENTS OF INCOME

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CONSOLIDATED BALANCE SHEETS

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CONSOLIDATED STATEMENTS OF CASH FLOWS

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SUPPLEMENTAL SEGMENT INFORMATION

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Reconciliation of GAAP and Non-GAAP Financial Measures

Unaudited

(In thousands, except per share data)

A. SCHULMAN, INC.

Reconciliation of GAAP and Non-GAAP Financial Measures

Unaudited

(In thousands, except per share data)