Trinseo CEO Christopher Pappas Honored with Leadership Award for Outstanding Corporate Reinvention

Company’s growth from a carve-out to IPO to tripling in value during
the preceding three years recognized by American Chemical Society

BERWYN, Pa.–(BUSINESS WIRE)–$TSE #Trinseo—Trinseo
(NYSE: TSE), a global materials company and manufacturer of plastics,
latex binders and synthetic rubber, and the Chemical
Marketing and Economics (CME) group of the American Chemical
Society’s (ACS) New York Section announced that Christopher D. Pappas,
Trinseo’s President and CEO, was honored with the Leadership Award for
Outstanding Corporate Reinvention, in part due to the Company tripling
in value during the preceding three years.

Pappas accepted the award on behalf of the entire Company during a
ceremony at the Metropolitan Club of New York on December 5. In his
remarks, Pappas credited his success at Trinseo to his employees, his
family, his mentors, and the foundational values they inspired in him.

“Trinseo is the top-performing stock in the chemical sector since we
went public in June of 2014,” Pappas said. “Believe me, that doesn’t
happen without a tremendous amount of effort from all 2,200 of Trinseo’s
employees. I accept this award on behalf of all of them.”

Few companies in the chemical sector have tripled in value in the last
three years. This achievement has been the result of Pappas' visionary
leadership and focus on safety, technology, financial discipline, and
growth.

In 2014, Trinseo was renamed from Styron, completed a successful IPO on
the New York Stock Exchange, and saw a 270% increase in its stock price
to date. The company also has an exceptional track record on employee
safety, with an OSHA recordable rate of 0.07 – which places the company
among the top five percent of chemical companies.

"The success of Trinseo, a company that combines the dynamism of a
start-up with the complexity and depth of a multinational conglomerate,
could not exist without the exceptional vision and leadership of Chris
Pappas," Mr. George Rodriguez, Leadership Awards founder and CME Past
Chair noted while recounting the firm's heritage at Dow Chemical and
impressive growth story since becoming fully public and independent.

Pappas joined the company at its formation in 2010 when it was carved
out from its former parent The Dow Chemical Company through a leveraged
buyout with private equity firm Bain Capital Partners. Under his
leadership, the company established independent operation, defined a new
vision and culture, dramatically improved its financial position,
launched expansions and capital investments.

"We truly believe we have set up Trinseo as a company with a culture and
a set of principles that will allow us to tackle our next set of
challenges as we look to 2018 and beyond," Pappas said.

Pappas has a 35-plus year distinguished career and proven operating
experience in the chemicals and plastics industry, and is an
accomplished leader of complex global businesses. Pappas started his
career at The Dow Chemical Company in 1978. In 1996 he joined DuPont Dow
Elastomers LLC where he was Vice President of Ethylene Elastomers and
later Commercial Vice President. He joined NOVA Chemicals Corporation in
2000 and held positions as Senior Vice President & President, Styrenics;
Chief Operating Officer; President and Chief Operating Officer; and
finally in 2009 as President and CEO.

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 $3.7 billion in net
sales in 2016, with 15 manufacturing sites around the world, and nearly
2,200 employees. For more information visit www.trinseo.com.

About CME

Established in 1954, the Chemical Marketing and Economics (CME) group of
the American Chemical Society’s New York Section, Inc. (ACS NY),
organizes monthly luncheons in New York City where business and
investment leaders share their insights on energy, materials and life
science. A nonprofit organization established in 1876 and chartered by
the U. S. Congress, the American Chemical Society (ACS) is the world’s
largest scientific society with over 150,000 members. www.cmeacs.org

Contacts

Press contacts:
Trinseo
Donna St. Germain, +1
610-240-3307
[email protected]
or
Makovsky
Doug
Hesney, +1 212-508-9661
[email protected]
or
Investor
Contact:
Trinseo
David Stasse, +1 610-240-3207
[email protected]