Second Quarter 2021 and Other Highlights

• Strong net income from continuing operations of $133 million and diluted EPS from continuing operations of $3.35
• Adjusted EBITDA* of $239 million, including a $5 million favorable impact from net timing, and Adjusted EPS* of $3.70
• Quarter-ending cash and cash equivalents of $367 million; including a use of nearly $200 million cash for the Arkema PMMA acquisition
• Entered into a definitive agreement to sell our Synthetic Rubber business to Synthos S.A. for an aggregate purchase price of $449 million, which reflects a reduction of $42 million for the assumption of pension liabilities; expected closing in the first half of 2022 following customary closing conditions and regulatory approvals
• Completed the acquisition of Arkema’s PMMA business on May 3, marking a major step in Trinseo’s transformation to becoming a specialty materials and sustainable solutions provider; on track to achieve first year synergy target and overall synergy opportunity believed to be larger than originally expected
• Announced agreement to acquire Aristech Surfaces LLC on July 19, which will broaden Trinseo’s product offerings in PMMA and aligns with the strategy of transforming to a specialty materials and sustainable solutions provider

Trinseo (NYSE: TSE)

Trinseo (NYSE: TSE), a global materials company and manufacturer of plastics and latex binders, today reported its second quarter 2021 financial results, which included its highest ever quarterly net income and Adjusted EBITDA. Net sales in the second quarter increased 138% versus prior year. Higher prices resulted in a 95% increase, mainly due to the pass through of higher raw material costs. Higher volumes resulted in a 17% increase, most notably in Base Plastics where automotive production shutdowns from COVID-19 caused low volumes in the prior year. The remainder of the increase was primarily from the addition of the Arkema PMMA business for two months of the quarter. Second quarter net income from continuing operations of $133 million was $107 million above prior year and second quarter Adjusted EBITDA of $239 million was $222 million above prior year. The increase in earnings can be attributed to a number of factors including higher margins, due to strong demand and tight supply in styrene, polystyrene, ABS and polycarbonate, higher volume, particularly in automotive, two months of earnings contribution from the newly acquired PMMA business and net timing favorability.

Cash used in operating activities in the second quarter was $21 million and capital expenditures were $20 million, resulting in Free Cash Flow for the quarter of negative $41 million. This result included a $180 million increase in net working capital attributed to significant increases in raw material costs, and an increase in inventory ahead of third quarter planned maintenance. The cash balance at the end of the quarter was $367 million. For a reconciliation of Free Cash Flow to cash provided by or used in operating activities, see Note 3 below.

Commenting on the Company’s second quarter performance, Frank Bozich, President and Chief Executive Officer of Trinseo, said, “We closed the first half of 2021 with record earnings as we have worked hard to supply our customers amid very tight market conditions. One of the greatest strengths of Trinseo is our employees, including the 860 new employees we recently added from the finalized Arkema PMMA acquisition, who work diligently to supply our products, support business initiatives and ensure our customers are provided with quality materials and innovative solutions.”

Second Quarter Results and Commentary by Business Segment

• Latex Binders net sales of $311 million for the quarter increased 89% versus prior year due primarily to the passthrough of higher raw materials. Sales volume was higher than prior year due to sales increases to CASE, textile and paper applications. Sales volume to CASE applications was up 23% on a year-to-date basis. Adjusted EBITDA of $32 million was $16 million higher than prior year attributed primarily to volume gains following COVID-19 headwinds in 2020.

• Engineered Materials net sales of $181 million for the quarter increased 383% versus prior year and Adjusted EBITDA of $28 million was $23 million higher than prior year. The increase in Adjusted EBITDA was primarily from two months of results from the newly acquired PMMA business. Excluding this portfolio change, sales volume increased significantly due to COVID-19 impacts in the prior year. The segment observed healthy demand for many of its applications including building and construction, consumer electronics, automotive and footwear.

• Base Plastics net sales of $397 million for the quarter were 162% higher than prior year, most of which can be attributed to higher price from commercial excellence actions as well as the passthrough of higher raw materials. Additionally, sales volume increased net sales due to higher demand for applications in construction, appliances and automotive where COVID-19 caused production shutdowns in the prior year. Adjusted EBITDA of $82 million was $94 million favorable versus prior year from higher volume as well as margin expansion in ABS and polycarbonate products caused by tight supply and high demand. The segment also benefited from $14 million of net timing favorability.

• Polystyrene net sales of $313 million for the quarter were 101% above prior year mainly from the passthrough of higher styrene. Sales volume decreased net sales by 12% following higher demand in the prior year to COVID-19 essential applications such as packaging. Adjusted EBITDA of $51 million was $36 million higher than prior year from stronger margins resulting from commercial excellence initiatives and very tight market conditions in Europe and Asia.

• Feedstocks net sales of $71 million for the quarter were 190% above prior year due mainly to the passthrough of higher styrene. Adjusted EBITDA of $40 million was $44 million higher than prior year due to significantly higher styrene margins in Europe, particularly due to strong demand and tight supply, as well as an $8 million favorable net timing variance.

• Americas Styrenics Adjusted EBITDA of $30 million for the quarter was $16 million above prior year due primarily to higher polystyrene volume and higher styrene margin in North America, mainly due to strong market demand and industry outages.

Held-For-Sale and Discontinued Operations

Beginning in the second quarter of 2021, our Synthetic Rubber business, formerly a separate reportable segment, has been classified as held-for-sale in our condensed consolidated balance sheets and treated as discontinued operations in our condensed consolidated statements of operations and statements of cash flows for all periods.

2021 Full-Year Outlook

• Full-year 2021 net income from continuing operations of $344 million to $380 million and Adjusted EBITDA of $750 million to $800 million, assuming no impact from net timing in the second half of the year; this outlook reflects eight months of the recent PMMA acquisition and excludes Synthetic Rubber, and does not include any impact from the recently announced Aristech Surfaces acquisition

• Full-year 2021 cash from operations of $425 million to $475 million and Free Cash Flow of $275 million to $325 million

Commenting on the outlook for the remainder of 2021, Bozich said, “While this forecast assumes strong earnings performance in the second half of the year from continued commercial excellence actions and high demand for most of our products, we estimate earnings to decline from the first half of the year. This is primarily attributed to no expected contribution from the Feedstocks segment as we anticipate styrene margins in Europe to normalize as supply increases. However, we expect higher cash generation in the second half of the year due to the continued strength in earnings as well as a cash source from working capital as we anticipate a decline in raw material prices following the extremely high price levels from the second quarter.”

Bozich added, “We continue to take action to transform Trinseo into a specialty materials and sustainable solutions provider. We are continuing to integrate the newly acquired PMMA business into our portfolio and we are on schedule to achieve the targeted first year cost synergies and have identified additional opportunities from what was originally communicated. The recently announced agreement to acquire Aristech Surfaces will broaden our product offerings to the transportation, building and construction and wellness markets and allow further growth in Asia with a profile that aligns with our strategy of pursuing opportunities with higher growth, higher margins and less cyclicality. As always, we continue to operate with a foundation in sustainability, as evidenced by our 2030 Sustainability Goals and the recently published 11^th annual Sustainability Report.”

Conference Call and Webcast Information

Trinseo will host a conference call to discuss its second quarter 2021 financial results on Thursday, August 5, 2021 at 10 a.m. Eastern Time.

Commenting on results will be Frank Bozich, President and Chief Executive Officer, David Stasse, Executive Vice President and Chief Financial Officer, and Andy Myers, Director of Investor Relations. To register for this conference call, please use the following links:

• Conference Call Registration – for those interested in asking questions during the Q&A session
• Webcast Registration – for those interested in listening only (available 20 minutes before the call)

After registering for the conference call, you will receive a confirmation email with a meeting invitation and information for entry. Registration is open through the live call, but it is advised that you register at least one day in advance to ensure you are connected for the full call.

Trinseo has posted its second quarter 2021 financial results on the Company’s Investor Relations website. The presentation slides will also be made available in the webcast player prior to the conference call. The Company will also furnish copies of the financial results press release and presentation slides to investors by means of a Form 8-K filing with the U.S. Securities and Exchange Commission.

A replay of the conference call and transcript will be archived on the Company’s Investor Relations website shortly following the conference call. The replay will be available until August 5, 2022.

About Trinseo

Trinseo (NYSE:TSE) is a global materials solutions provider and manufacturer of plastics and latex binders with a focus on delivering innovative, sustainable, and value-creating products that are intrinsic to our daily lives. Trinseo is dedicated to making a positive impact on society by partnering with like-minded stakeholders, and supporting the sustainability goals of our customers in a wide range of end-markets including automotive, consumer electronics, appliances, medical devices, packaging, footwear, carpet, paper and board and building and construction. Trinseo had approximately $3.0 billion in net sales in 2020. With the May 2021 acquisition of the Arkema PMMA business, the Company has 24 manufacturing sites around the world, and approximately 3,500 employees. For more information, please visit: www.trinseo.com.

Use of non-GAAP measures

In addition to using standard measures of performance and liquidity that are recognized in accordance with accounting principles generally accepted in the United States of America (“GAAP”), we use additional measures of income excluding certain GAAP items (“non-GAAP measures”), such as Adjusted Net Income, EBITDA, Adjusted EBITDA and Adjusted EPS and measures of liquidity excluding certain GAAP items, such as Free Cash Flow. We believe these measures are useful for investors and management in evaluating business trends and performance each period. These measures are also used to manage our business and assess current period profitability, as well as to provide an appropriate basis to evaluate the effectiveness of our pricing strategies. Such measures are not recognized in accordance with GAAP and should not be viewed as an alternative to GAAP measures of performance or liquidity, as applicable. The definitions of each of these measures, further discussion of usefulness, and reconciliations of non-GAAP measures to GAAP measures are provided in the Notes to Condensed Consolidated Financial Information presented herein.

Cautionary Note on Forward-Looking Statements

This press release may contain forward-looking statements including, without limitation, statements concerning plans, objectives, goals, projections, strategies, future events or performance, and underlying assumptions and other statements, which are not statements of historical facts or guarantees or assurances of future performance. Forward-looking statements may be identified by the use of words like "expect," "anticipate," "intend," "forecast," "outlook," "will," "may," "might," "see," "tend," "assume," "potential," "likely," "target," "plan," "contemplate," "seek," "attempt," "should," "could," "would" or expressions of similar meaning. Forward-looking statements reflect management’s evaluation of information currently available and are based on our current expectations and assumptions regarding our proposed acquisition of Aristech Surfaces, LLC, our proposed sale of our synthetic rubber business, our business, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Factors that might cause such a difference include, but are not limited to, our ability to successfully complete the Aristech acquisition or meet the conditions to closing, including regulatory approvals, our ability to successfully integrate Aristech and its employees, to generate expected cost and revenue synergies and expected margins, and to profitably grow the Aristech business, our ability to complete the sale of our synthetic rubber business, and those factors discussed in our Annual Report on Form 10-K, under Part I, Item 1A —"Risk Factors" and elsewhere in our other reports, filings and furnishings made with the U.S. Securities and Exchange Commission from time to time. As a result of these or other factors, our actual results may differ materially from those contemplated by the forward-looking statements. Therefore, we caution you against relying on any of these forward-looking statements. The forward-looking statements included in this press release are made only as of the date hereof. We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

TRINSEO S.A.

Notes to Condensed Consolidated Financial Information

(Unaudited)

Note 1: Net Sales by Segment

Note 2: Reconciliation of Non-GAAP Performance Measures to Net Income

EBITDA is a non-GAAP financial performance measure, which is defined as income from continuing operations before interest expense, net; income tax provision; depreciation and amortization expense. We refer to EBITDA in making operating decisions because we believe it provides our management as well as our investors with meaningful information regarding the Company’s operational performance. We believe the use of EBITDA as a metric assists our board of directors, management and investors in comparing our operating performance on a consistent basis.

We also present Adjusted EBITDA as a non-GAAP financial performance measure, which we define as income from continuing operations before interest expense, net; income tax provision; depreciation and amortization expense; loss on extinguishment of long-term debt; asset impairment charges; gains or losses on the dispositions of businesses and assets; restructuring charges; acquisition related costs and benefits, and other items. In doing so, we are providing management, investors, and credit rating agencies with an indicator of our ongoing performance and business trends, removing the impact of transactions and events that we would not consider a part of our core operations.

Lastly, we present Adjusted Net Income and Adjusted EPS as additional performance measures. Adjusted Net Income is calculated as Adjusted EBITDA (defined beginning with net income from continuing operations, above), less interest expense, less the provision for income taxes and depreciation and amortization, tax affected for various discrete items, as appropriate. Adjusted EPS is calculated as Adjusted Net Income per weighted average diluted shares outstanding for a given period. We believe that Adjusted Net Income and Adjusted EPS provide transparent and useful information to management, investors, analysts and other stakeholders in evaluating and assessing our operating results from period-to-period after removing the impact of certain transactions and activities that affect comparability and that are not considered part of our core operations.

There are limitations to using the financial performance measures noted above. These performance measures are not intended to represent net income or other measures of financial performance. As such, they should not be used as alternatives to net income as indicators of operating performance. Other companies in our industry may define these performance measures differently than we do. As a result, it may be difficult to use these or similarly-named financial measures that other companies may use, to compare the performance of those companies to our performance. We compensate for these limitations by providing reconciliations of these performance measures to our net income, which is determined in accordance with GAAP.

For the same reasons discussed above, we are providing the following reconciliation of forecasted net income to forecasted Adjusted EBITDA and Adjusted EPS for the year ended December 31, 2021. See “Note on Forward-Looking Statements” above for a discussion of the limitations of these forecasts.

Note 3: Reconciliation of Non-GAAP Liquidity Measures to Cash from Operations

The Company uses certain measures, such as Free Cash Flow as non-GAAP measures, to evaluate and discuss its liquidity position and results. Free Cash Flow is defined as cash from operating activities, less capital expenditures. We believe that Free Cash Flow provides an indicator of the Company’s ongoing ability to generate cash through core operations, as it excludes the cash impacts of various financing transactions as well as cash flows from business combinations that are not considered organic in nature. We also believe that Free Cash Flow provides management and investors with useful analytical indicators of our ability to service our indebtedness, pay dividends (when declared), and meet our ongoing cash obligations.

Free Cash Flow is not intended to represent cash flows from operations as defined by GAAP, and therefore, should not be used as alternatives for that measure. Other companies in our industry may define Free Cash Flow differently than we do. As a result, it may be difficult to use this or similarly-named financial measures that other companies may use, to compare the liquidity and cash generation of those companies to our own. The Company compensates for these limitations by providing the following detail, which is determined in accordance with GAAP.

Free Cash Flow

For the same reasons discussed above, we are providing the following reconciliation of forecasted cash provided by operations and cash used for capital expenditures to forecasted Free Cash Flow for the year ended December 31, 2021. See “Note on Forward-Looking Statements” above for a discussion of the limitations of these forecasts.

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