Ecovyst Inc.

ECVT·NYSE·$14.06Share Price as of 11/2·$2BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/06/26 10-QQ1 ended 03/31/2605/05/26 10-KFY 202502/27/26 10-QQ3 ended 09/30/2511/05/25 10-QQ2 ended 06/30/2508/07/25

Disclosures

8-KCurrent report10/28/26 8-KCurrent report08/24/26 8-KCurrent report08/05/26 8-KCurrent report06/30/26 8-KCurrent report05/21/26

Prospectuses and Registrations

424B7Prospectus05/25/23 424B7Prospectus05/24/23 FWPFree writing prospectus05/24/23 424B7Prospectus03/06/23 424B7Prospectus03/02/23

Proxies

DEF 14ADefinitive proxy04/15/26 DEF 14ADefinitive proxy04/08/25 DEFA14AAdditional proxy materials05/06/24 DEF 14ADefinitive proxy04/08/24 PRE 14APreliminary proxy03/15/24

Ownership

Form 4Insider transaction09/14/26 Form 3Initial insider ownership08/26/26 Form 4Insider transaction08/26/26 SC 13GBeneficial ownership07/31/26 144Proposed sale of securities07/17/26

Other

11-KEmployee stock purchase plan report06/22/26 ARSAnnual report to shareholders04/15/26 11-KEmployee stock purchase plan report06/20/25 SDConflict Minerals disclosure05/30/25 ARSAnnual report to shareholders04/08/25