Trinseo Adopts GRI Standards for Annual Sustainability and Corporate Social Responsibility Reporting

Company increasing transparency with global comparability and more
detailed disclosure on environmental and social impact

BERWYN, Pa.–(BUSINESS WIRE)–$TSE #suatainability—Trinseo
(NYSE: TSE), a global materials solutions provider and manufacturer of
plastics, latex binders and synthetic rubber, today announced it is
increasing its focus on sustainability and transparency with the
adoption of the Global
Reporting Initiative (GRI) framework for public sustainability
reporting.

ÔÇ£At Trinseo, sustainability and corporate social responsibility are
intrinsic to who we are,ÔÇØ said Catherine Maxey, Vice President, Public
Affairs, Sustainability and Environment, Health and Safety. ÔÇ£Our
adoption of the GRI Standards as the framework for our public
sustainability reporting redoubles our commitment to transparency.
Adhering to the GRI Standards is consistent with TrinseoÔÇÖs commitment to
integrity and accountability, and demonstrates an openness to disclose
our contributions and impact on our stakeholders and the world.ÔÇØ

The Global Reporting Initiative is the leading independent organization
that provides a common language and framework for public sustainability
reporting, allowing more global comparability and better quality of
information about company sustainability impacts. GRI provides expertise
to assist companies in expanding their disclosure and reporting
activities around this common framework.

ÔÇ£We are excited to be a part of TrinseoÔÇÖs journey towards adopting GRI's
reporting framework: the most used framework worldwide due to its
credibility, flexibility and adaptability,ÔÇØ said Shivani Rajpal,
Director-Services, GRI. ÔÇ£As a first step, we will work together with
Trinseo and perform the GRI Kick-off Service to set off the reporting
process for their first report to be prepared in accordance with the GRI
Standards that will be published in 2019.ÔÇØ

Trinseo will begin using the GRI Standards in its 2017 Sustainability
report, which will be published in the third quarter of 2018. The
company is planning to provide a full GRI-aligned Sustainability Report
in 2019.

Trinseo, formerly Styron, published its first Sustainability/CSR report
in 2011, with public disclosure of emissions, energy use, water use, and
waste and safety performance. The company has continued to issue a
public report annually on its website at www.trinseo.com/sustainability.
Now with the adoption of the GRI framework in 2018, the companyÔÇÖs
Sustainability/CSR reports will contain even more information than in
the past.

Trinseo became a Responsible
Care® company at its formation in 2010, joined the Carbon Disclosure
Program (CDP) in 2012, the Green Freight Europe Programme in 2013, and
Operation Clean Sweep in 2014.

TrinseoÔÇÖs products enable its customers to create more sustainable
solutions by reducing energy use, preserving health, enhancing safety,
improving durability, and conserving natural resources. The companyÔÇÖs
vision is to be a world leader in delivering innovative materials,
technologies, and solutions that enable a more sustainable world.

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 ÔÇö products that are
intrinsic to how we live our lives ÔÇö across a wide range of end-markets,
including automotive, appliances, consumer electronics, medical devices,
electrical, building and construction, textile, paper and board,
footwear and tires. Trinseo had approximately $4.4 billion in net sales
in 2017, with 16 manufacturing sites around the world, and approximately
2,200 employees. For more information visit www.trinseo.com.

Note on Forward-Looking Statements:
This press release
may contain ÔÇ£forward-looking statementsÔÇØ within the meaning of the safe
harbor provisions of the United States Private Securities Litigation
Reform Act of 1995. Words such as ÔÇ£expect,ÔÇØ ÔÇ£estimate,ÔÇØ ÔÇ£project,ÔÇØ
ÔÇ£budget,ÔÇØ ÔÇ£forecast,ÔÇØ ÔÇ£anticipate,ÔÇØ ÔÇ£intend,ÔÇØ ÔÇ£plan,ÔÇØ ÔÇ£may,ÔÇØ ÔÇ£will,ÔÇØ
ÔÇ£could,ÔÇØ ÔÇ£should,ÔÇØ ÔÇ£believes,ÔÇØ ÔÇ£predicts,ÔÇØ ÔÇ£potential,ÔÇØ ÔÇ£continue,ÔÇØ and
similar expressions are intended to identify such forward-looking
statements. Forward-looking statements in this press release may
include, without limitation, forecasts of growth, revenues, business
activity, acquisitions, financings and other matters that involve known
and unknown risks, uncertainties and other factors that may cause
results, levels of activity, performance or achievements to differ
materially from results expressed or implied by this press release. As a
result of the foregoing considerations, you are cautioned not to place
undue reliance on these forward-looking statements, which speak only as
of the date of this press release. The Company undertakes no obligation
to publicly update or revise any forward-looking statements, whether as
a result of new information, future events or otherwise.

Contacts

Trinseo
Donna St.Germain, +1-610-240-3307
[email protected]