Trinseo PLC Receives Notice of Delisting from NYSE: Shareholders Face Immediate Trading Suspension and Potential Stamp Duty Implications

Key Points:

• Trinseo PLC has received a written notice from the New York Stock Exchange (NYSE) stating that the NYSE will commence proceedings to delist the company’s ordinary shares.
• The delisting is pursuant to Section 802.01B of the NYSE Listed Company Manual, triggered by Trinseo’s failure to maintain an average market capitalization of at least \$15 million over a 30-trading day period.
• Trading in Trinseo’s ordinary shares has been suspended immediately by the NYSE.
• This follows previous notices received by Trinseo on December 12, 2025, for failing to maintain an average market capitalization over a consecutive 30 trading-day period of at least \$50 million and stockholders’ equity of at least \$50 million, as well as non-compliance with the minimum share price requirement (\$1.00/share for 30 consecutive trading days).
• The NYSE will file a Form 25 with the SEC to formally delist Trinseo’s ordinary shares, effective 10 days after filing.
• The company’s business operations and SEC reporting obligations will not be affected by the delisting or trading suspension, according to management.

Price-Sensitive and Shareholder-Critical Information:

• Immediate Trading Suspension: Shareholders can no longer trade Trinseo shares on the NYSE. This is a significant liquidity event and may impact share value and ability to buy or sell.
• Potential Trading on OTC Pink Limited Market: Trinseo shares may begin trading on the OTC Pink Limited Market, which is a substantially less liquid and less regulated market. However, the company cannot guarantee its shares will trade or be quoted on any market, and there is no assurance of sustained trading or adequate trading volume.
• Stamp Duty Implications: Upon delisting, transfers of ordinary shares will be subject to Irish stamp duty at 1% of the higher of purchase price or market value, unless exemptions apply. The Depository Trust Company (DTC) will cease clearing/settling trades in Trinseo shares due to this, and all positions will be transferred to the company’s transfer agent. Shareholders may need to transfer shares to another clearing agent or register directly with the transfer agent to continue trading.
• Shareholders are urged to consult their own tax and legal counsel regarding trading implications and stamp duty, and to coordinate with brokers to register shares with the transfer agent if planning to sell.
• No Impact on Operations: Management asserts that business operations, partner and employee relationships, and SEC reporting will not be affected by the delisting or suspension.

Detailed Article:

On March 2, 2026, Trinseo PLC, a leading provider of plastics and synthetic resins, was notified by the New York Stock Exchange (NYSE) that the exchange will begin proceedings to delist the company’s ordinary shares. This critical development was prompted by Trinseo’s failure to comply with the continued listing standards set forth in Section 802.01B of the NYSE Listed Company Manual, specifically the requirement to maintain an average market capitalization of at least \$15 million across a 30-day trading period.

As a result, trading in Trinseo’s ordinary shares has been suspended immediately. This follows previous notifications in December 2025, where the company was found to be non-compliant with higher thresholds: a \$50 million market capitalization and \$50 million stockholders’ equity. Additionally, Trinseo’s share price had fallen below \$1.00 per share for 30 consecutive trading days, violating Section 802.01C of the manual.

The NYSE has indicated that it will file Form 25 with the SEC to officially delist Trinseo’s ordinary shares. The delisting will become effective 10 days after the form is filed. Despite these developments, Trinseo asserts that its business operations, relationships with partners and employees, and ongoing SEC reporting obligations remain unaffected.

For investors and shareholders, the immediate suspension from the NYSE is a major liquidity event. The company’s shares may begin trading on the OTC Pink Limited Market, which is operated by OTC Markets Group, Inc. This market is far less liquid and less regulated than the NYSE, and there is no guarantee that trading or quotation will commence or persist. Broker-dealers may stop providing public quotes, and trading volumes may be insufficient to create an efficient market for Trinseo shares.

Shareholders must also be aware of tax and legal implications. Upon delisting, any transfer of Trinseo’s ordinary shares will be subject to Irish stamp duty at a rate of 1% of the higher of the purchase price or market value. The DTC will stop clearing and settling trades due to this stamp duty, and all positions will be moved to Trinseo’s transfer agent. Shareholders may need to transfer their shares to another clearing and settlement agent or register directly with the transfer agent to facilitate trades.

Given these significant changes, shareholders are strongly encouraged to consult with their brokers and tax/legal advisors to understand the process and implications of registering their shares and trading post-delisting. The company’s transfer agent is Computershare Trust Company, N.A.

Looking forward, the company cautions that there are many uncertainties and risks associated with its delisting, share liquidity, and market conditions. Management’s forward-looking statements indicate that actual outcomes may differ materially from current expectations.

Disclaimer: The above article is based on Trinseo PLC’s SEC Form 8-K filed March 2, 2026. It contains forward-looking statements and interpretations. Investors should consider their own due diligence and consult professional advisors for investment, tax, or legal decisions. The article is for informational purposes only and does not constitute investment advice. The author is not responsible for any actions taken based on this content.

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