FMR LLC and Abigail P. Johnson filed a Schedule 13G with the SEC on November 4, 2026, disclosing beneficial ownership of 8,475,538 shares of Ecovyst Inc. common stock as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: FMR LLC and Abigail P. Johnson each reported beneficial ownership of 8,475,538 shares of Ecovyst Inc. common stock, representing 7.7% of the class.
  • Sole voting power: FMR LLC reported sole voting power over 8,444,236 shares; Abigail P. Johnson reported sole voting power over 0 shares.
  • Sole dispositive power: Both FMR LLC and Abigail P. Johnson each reported sole dispositive power over 8,475,538 shares.
  • Shared voting and dispositive power: Both reporting persons disclosed 0 shares subject to shared voting or shared dispositive power.
  • Event date: The date of the event requiring the filing was September 30, 2026.
  • Third-party interest noted: According to the filing, one or more other persons are known to have the right to receive or direct receipt of dividends or sale proceeds from the common stock, though no single other person's interest exceeds 5% of the total outstanding common stock.

FMR LLC and Abigail P. Johnson Disclose Ownership Position in Ecovyst Inc.

FMR LLC, a Delaware-organized holding company with principal offices at 245 Summer Street, Boston, Massachusetts 02210, filed a Schedule 13G disclosing a 7.7% beneficial ownership position in the common stock of Ecovyst Inc. (NYSE:ECVT), which is headquartered at 600 Lee Road, Suite 200, Wayne, PA 19087. The filing was signed on November 4, 2026, by Stephanie J. Brown, acting under a Power of Attorney effective January 3, 2023, on behalf of FMR LLC and its direct and indirect subsidiaries. The triggering event date cited in the filing is September 30, 2026.

Abigail P. Johnson, a United States citizen, is separately listed as a reporting person on the same Schedule 13G and also reported beneficial ownership of 8,475,538 shares, equating to 7.7% of the class. Johnson's filing was also signed by Stephanie J. Brown on November 4, 2026, acting under a Power of Attorney effective January 26, 2023. Unlike FMR LLC, Johnson reported sole voting power of 0 shares, while retaining sole dispositive power over all 8,475,538 shares.

According to the filing, the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." FMR LLC is classified as a parent holding company (type HC), and Abigail P. Johnson is classified as an individual (type IN). An Exhibit 99 is referenced in the filing identifying the relevant subsidiaries through which the position is held.

What Was Disclosed

FMR LLC and Abigail P. Johnson jointly filed a Schedule 13G reporting aggregate beneficial ownership of 8,475,538 shares, or 7.7%, of Ecovyst Inc. common stock (CUSIP 27923Q109) as of September 30, 2026, with no shared voting or dispositive power reported.