June 4, 2020

Dear Calista Corporation Shareholder,

On June 3, 2020, Calista Corporation (“Calista”) was notified of a typographical error in the proxy statement that was included in the 2020 Annual Meeting Materials Booklet distributed to Calista shareholders on May 22, 2020 (“Proxy Statement”).

Page 20 of this Proxy Statement includes a table with a statement of all current compensation or other remuneration distributed or accrued and of all future compensation or other remuneration contributed by Calista and its subsidiaries during the fiscal year ended December 31, 2019, to or on behalf of each of the five most highly compensated officers or Directors for the Director’s or officer’s services in all capacities to Calista and its subsidiaries during 2019.

The “Total” compensation for each of these individuals displayed in the far-right column is correct. And the total of all current compensation or other remuneration distributed or accrued and all future compensation or other remuneration contributed by Calista during the fiscal year ended December 31, 2019, to or on behalf of all 44 officers and 12 Directors who served in 2019, as a group, is correct.

However, one number in the table was incorrect. “Compensation Paid” for Andrew Guy, President/CEO of Calista Corporation, was printed as $293,968. The correct number is $393,968 and is included below.

All of the numbers in “Total” column, including the total compensation amount for Andrew Guy, were correct in the Proxy Statement previously issued. However, in order to maintain transparency, Calista is notifying the shareholders of the typographical error in the “Compensation Paid” column.

Respectfully,

Walter T. Featherly, General Counsel