Trinseo Announces its 2030 Sustainability Goals

HONG KONG,July 13,2020 -- Trinseo (NYSE: TSE),a leading solution provider,today announced its 2030 Sustainability Goals. Reaching a milestone celebrating its 10th anniversary this year,Trinseo believes it is high time to embark on an ambitious,measurable,and achievable longer-term sustainability journey.

Trinseo Announces its 2030 Sustainability Goals

"We are proud to announce Trinseo's Sustainability Goals for the next decade that will drive long-term,positive change for our organization,our customers,this generation,and the next," said Frank Bozich,President and Chief Executive Officer,Trinseo. "Our commitment to sustainability is embedded into our company culture through our operations and our commitment to deliver innovative and sustainable technologies. By partnering with like-minded customers,suppliers and other stakeholders,we are creating sustainable changes."

This ambitious plan includes 15 long-term goals under five main categories that target climate change,sustainable products,supplier responsibility,responsible operations,and sustainable workforce. These goals were created,in part,from a critical assessment of the Company's capabilities as well as valuable feedback from customers and suppliers.

"Given the many challenges our industry and society face,we believe that we must strive to be a driver of sustainable solutions," said Walter van het Hof,Global Industry Affairs & Sustainability Leader,Trinseo. "We have a responsibility as a company to contribute to making the world a better place,by solving significant problems with our technologies and promoting a culture that is true to our core values."

Using inspiration from the United Nations Sustainable Development Goals (SDGs) and the Global Reporting Initiative (GRI) framework for sustainability reporting,Trinseo has committed to taking a deeper and more holistic look at its material topics and related impacts,based on the priorities of its stakeholders. Through that analysis,the Company is setting a foundation to drive meaningful change across all areas of business.

At a glance,the five main categories of the sustainability goals include:

Climate Change

By 2035,reduce 1 & 2 GHG emissions intensity by 35% Scope with progress milestones of 10% reduction by 2025 and 20% reduction by 2030.

By 2030,increase the share of electricity from non-fossil sources from 5% to 30%.

Sustainable Products

By 2025,dedicate at least 30% of technology and innovation/R&D efforts toward circular economy solutions.

By 2030,increase the share of sustainably advantaged products to 40%.

Supplier Responsibility

By 2025,implement a Sustainability/Corporate Social Responsibility (CSR) Due Diligence program for new key suppliers as an addition to the existing supplier on-boarding process.

Responsible Operations

By 2030,reduce freshwater intake by 20%,overall waste generation by 15% and waste disposal to landfill to zero.

By 2030,all pellet-handling sites achieve zero pellet loss to the environment through Operation Clean Sweep®.

Sustainable Workforce

Continuously meet societal expectations to live out our values of safety,respect for people,and employee engagement.

View all 15 Sustainability Goals at trinseo.com/sustainabilitygoals

Trinseo's Sustainability program was recognized by Newsweekin its list of America's Most Responsible Companies 2020 (ranked #5 in the Materials industry) as well as receiving positive ratings from EcoVadis and CDP (formerly known as the Carbon Disclosure Project).

About Trinseo

Trinseo (NYSE:TSE) is a global materials solutions provider and manufacturer of plastics,latex binders,and synthetic rubber. We are focused on delivering innovative and sustainable solutions to help our customers create products that touch lives every day-- products that are intrinsic to how we live our lives-- across a wide range of end-markets,including automotive,consumer electronics,appliances,medical devices,lighting,electrical,carpet,paper and board,building and construction,and tires. Trinseo had approximately US$3.8 billion in net sales in 2019,with 17 manufacturing sites around the world,and approximately 2,700 employees. For more information visitwww.trinseo.com.

Cautionary Note on Forward-Looking Statements

This press release may contain "forward-looking statements" including,without limitation,statements concerning plans,objectives,goals,projections,expectations,strategies,future events or performance,and underlying assumptions and other statements,which are not statements of historical facts. Forward-looking statements may be identified by the use of words like "expect," "estimate," "will," "may," or expressions of similar meaning. Forward-looking statements reflect management's evaluation of information currently available and are based on the Company's current expectations and assumptions regarding the impact from the COVID-19 pandemic,the Company's business,the economy and other future conditions. Specific factors that could cause future results to differ from those expressed by the forward-looking statements include,but are not limited to,risks related to the ongoing impact of the COVID-19 pandemic and those discussed in the Company's Annual Report for the year ended December 31,2019 filed with the Securities and Exchange Commission ("SEC"),in subsequent Quarterly Reports on Form 10-Q and in other filings and furnishings made by the Company with the SEC from time to time. Other unknown or unpredictable factors could also have material adverse effects on the Company's performance. As a result of these or other factors,the Company's actual results may differ materially from those contemplated by the forward-looking statements. The forward-looking statements included in this press release are made only as of the date hereof and are not a guarantee of future performance. The Company undertakes 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.

Press Contact:

Trinseo

Mandy Markert

+41 44 718 3635

mmmarkert@trinseo.com

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