Covista Inc.

On September 14, 2026, Mr. Stephen W. Beard, Covista’s Chairman and Chief Executive Officer, adopted a 10b5-1 Preset Diversification Program (the “New 10b5-1 Plan”). Mr. Beard’s New 10b5-1 Plan is a continuation of his current 10b5-1 Plan entered into on December 10, 2025, which expires on November 30, 2026 (the “Current Plan”). The New 10b5-1 Plan provides for the sale of Covista common stock that has not been sold under Mr. Beard’s Current Plan. Mr.

Beard’s New 10b5-1 Plan is intended to satisfy the affirmative defense of Rule 10b5-1(c). Trades under Mr. Beard’s New 10b5-1 Plan are subject to the required “cooling-off” period with the estimated first sale date under Mr. Beard’s New 10b5-1 Plan to occur not before December 15, 2026, after the expiration of his Current Plan. Mr. Beard’s New 10b5-1 Plan expires on May 28, 2027. The New 10b5-1 Plan governs Mr. Beard’s sale of 112,859 shares of Covista common stock. After such sales, Mr. Beard would continue to satisfy the stock ownership requirements for our executive officers. Transactions under the New 10b5-1 Plan will be disclosed publicly through Form 144 and Form 4 filings with the SEC to the extent required by law.

On September 14, 2026, Mr. Robert Phelan, Covista’s Senior Vice President and Chief Financial Officer, adopted a 10b5-1 Plan. Mr. Phelan’s 10b5-1 Plan is intended to satisfy the affirmative defense of Rule 10b5-1(c). Trades under Mr. Phelan’s 10b5-1 Plan are subject to the required “cooling-off period” with the estimated first sale date under Mr. Phelan’s 10b5-1 Plan to occur not before December 15, 2026. Mr. Phelan’s 10b5-1 Plan expires on September 24, 2027. The 10b5-1 Plan governs Mr. Phelan’s sale of 22,000 shares of Covista common stock. After such sales, Mr. Phelan would continue to satisfy the stock ownership requirements for our executive officers. Transactions under the 10b5-1 Plan will be disclosed publicly through Form 144 and Form 4 filings with the SEC to the extent required by law.

In accordance with applicable SEC rules, the following is intended to satisfy Covista’s Item 5.02 Form 8-K reporting obligations by making timely disclosure in accordance with Item 5(a) of Form 10-Q.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Retirement of Chief Financial Officer

On October 27, 2026, Mr. Robert J. Phelan, Covista’s Senior Vice President and Chief Financial Officer, as well as its principal financial officer, informed Covista of his intention to retire from these positions after nearly seven years, as part of a planned transition. Mr. Phelan will continue to serve in these roles until his successor is named, with no change in responsibilities. Mr. Phelan will support the incoming Chief Financial Officer through a transition period. Covista has initiated a search for Mr. Phelan’s successor. Mr. Phelan will continue to receive his current compensation and benefits for which he is eligible during this period. The terms of Mr. Phelan’s compensation arrangements in connection with his retirement from Covista have not yet been finalized. Covista will disclose any material terms in a future filing with the SEC once finalized.