REVOLVING CREDIT NOTE
For value received, the undersigned, Zoltek Companies, Inc., a Missouri corporation, Zoltek Corporation, a
Missouri corporation, [others] (individually and collectively hereinafter “ Borrowers ”; all references to
“Borrowers” or “Borrower” shall mean each and all of the Borrowers), hereby jointly and severally promise to
pay to the order of Southwest Bank of St. Louis (the “ Bank ”), in lawful money of the United States of America,
the principal sum of Six Million Seven Hundred Nineteen Thousand Seven Hundred and Seventy-Seven Dollars
and no/00 ($6,790,770.00), or if less, the amount outstanding under the Credit Agreement (as hereinafter
defined), together with interest from the date hereof at the rate provided for in the Credit Agreement. Principal
and interest of this Note shall be payable at the time or times provided in the Credit Agreement.
This Revolving Credit Note (this “ Note ”) is the Revolving Credit Note referred to in, and is issued pursuant
to, that certain Credit Agreement between the Borrowers and the Bank dated even date herewith (as amended
or otherwise modified from time to time, the “ Credit Agreement ”), and is entitled to all of the benefits and
security of the Credit Agreement. All of the terms, covenants and conditions of the Credit Agreement and all
other instruments evidencing or securing the indebtedness hereunder are hereby made a part of this Note and are
deemed incorporated herein in full. All capitalized terms used herein, unless otherwise specifically defined in this
Note, shall have the meanings ascribed to them in the Credit Agreement.
This Note is secured by the Collateral described in the Credit Agreement.
Interest hereunder shall be computed on, the basis of actual days elapsed over the period of a 360-day year.
Upon or after the occurrence and during the continuation of any Event of Default, the outstanding principal
balance of this Note shall bear interest at a variable rate per annum equal t