Exhibit 4.14



|     |  |                                          
|---- |  | -----------------------------------------
|LOGO |  | Addendum A To Note
LIBOR Index Rate (104)

SECTION 1

Definitions.As used
in this Addendum, the following terms shall have the meanings set forth below:

Bank shall mean SunTrust Bank and
its successors and assigns.

Borrower shall collectively and individually refer to the maker of the attached note
dated April 30, 2010 (Note). The terms of this Addendum are hereby incorporated into the Note and in the event of any conflict between the terms of the Note and the terms of this Addendum, the terms of this Addendum shall control.

Business Day shall mean, with respect to Interest Periods applicable to the LIBOR Rate, a day on which the Bank is
open for business and on which dealings in U.S. dollar deposits are carried on in the London Inter-Bank Market.

Interest
Period shall mean a period of one (1) month, provided that (i) the initial Interest Period may be less than one month, depending on the initial funding date and (ii) no Interest Period shall extend beyond the maturity date of
the Note.

Interest Rate Determination Date shall mean the date the Note is initially funded and the first Business
Day of each calendar month thereafter.

LIBOR Rate shall mean that rate per annum effective on any Interest Rate
Determination Date which is equal to the quotient of:

(i) the rate per annum equal to the offered rate for deposits in U.S.
dollars for a one (1) month period, which rate appears on that page of Bloomberg reporting service, or such similar service as determined by the Bank, that displays British Bankers Association interest settlement rates for deposits in
U.S. Dollars, as of 11:00 A.M. (London, England time) two (2) Business Days prior to the Interest Rate Determination Date; provided, that if no such offered rate appears on such page, the rate used for such Interest Period will be the
per annum rate of interest determined by the Bank to be the rate at which U.S. dollar deposits for the Interest Period, are offered to the Bank in the London Inter-Bank Market as of 11:00 A.M. (London, England time), on the day which is two
(2) Business Days prior to the Interest Rate Determination Date, divided by

(ii) a percentage equal to 1.00 minusthe maximum reserve percentages (including any emergency, supplemental, special or other marginal reserves) expressed as a decimal (rounded upward to the next 1/100th of 1%) in effect on any day to which the Bank is subject with respect to any
LIBOR loan pursuant to regulations issued by the Board of Governors of the Federal Reserve System with respect to eurocurrency funding (currently referred to as eurocurrency liabilities under Regulation D). This percentage will be
adjusted automatically on and as of the effective date of any change in any reserve percentage.

Prime Rate shall
mean the publicly announced prime lending rate of the Bank from time to time in effect, which rate may not be the lowest or best lending rate made available by the Bank or, if the Note is governed by Subtitle 10 of Title 12 of the Commercial Law
Article of the Annotated Code of Maryland, Prime Rate shall mean the Wall Street Journal Prime Rate, which is the Prime Rate published in the Money Rates section of the Wall Street Journal from time to time.

SECTION 2

Interest.The Borrower shall pay interest upon the unpaid principal balance of the Note at the LIBOR Rate plus the margin provided in the Note. Interest shall be due and payable as provided in the Note and shall be calculated as described in the Note. The
interest rate shall remain fixed during each month based upon the interest rate established pursuant to this Addendum on the applicable Interest Rate Determination Date.

SECTION 3

Additional Costs.In
the event that any applicable law or regulation or the interpretation or administration thereof by any governmental authority charged with the interpretation or administration thereof (whether or not having the force of law) (i) shall change
the basis of taxation of payments to the Bank of any amounts payable by the Borrower hereunder (other than taxes imposed on the overall net income of the Bank) or (ii) shall impose, modify or deem applicable any reserve, special deposit or
similar requirement against assets of, deposits with or for the account of, or credit extended by the Bank, or (iii) shall impose any other condition with respect to the Note, and the result of any of the foregoing is to increase the cost to
the Bank of making or maintaining the Note or to reduce any amount receivable by the Bank hereunder, and the Bank determines that such increased costs or reduction in amount receivable was attributable to the LIBOR Rate basis used to establish the
interest rate hereunder, then the Borrower shall from time to time, upon demand by the Bank, pay to the Bank additional amounts sufficient to compensate the Bank for such increased costs (the Additional Costs). A detailed statement as to
the amount of such Additional Costs, prepared in good faith and submitted to the Borrower by the Bank, shall be conclusive and binding in the absence of manifest error.



Page 1 of 2



---

SECTION 4

Unavailability Of Dollar Deposits. If the Bank determines in its sole discretion at any time (the Determination Date) that it can no
longer make, fund or maintain LIBOR based loans for any reason, including without limitation illegality, or the LIBOR Rate cannot be ascertained or does not accurately reflect the Banks cost of funds, or the Bank would be subject to Additional
Costs that cannot be recovered from the Borrower, then the Bank will notify the Borrower and thereafter will have no obligation to make, fund or maintain LIBOR based loans. Upon such Determination Date the Note will be converted to a variable rate
loan based upon the Prime Rate. Thereafter the interest rate on the Note shall adjust simultaneously with any fluctuation in the Prime Rate.



|                            |  |        |  |  |  |                                                          |  |                   
|--------------------------- |  | ------ |  |  |  | -------------------------------------------------------- |  | ------------------
|Individual(s) Signature(s): |  |        |  |  |  | Non-Individual Signature:                               
|                            |  |        | 
|                            |  | (Seal) |  |  |  | Optical Cable Corporation                               
|                            |  |        |  | 
|                            |  | (Seal) |  |  |  | By:                                                      |  | /s/ Tracy G. Smith
|                            |  |        |  |  |  |                                                          |  |                   
|                            |  |        |  |  |  | Tracy G. Smith, CFO, Senior Vice President and Secretary
|                            |  |        |  |  |  | Name and title, printed or typed                        
|                            |  |        |  | 
|                            |  |        |  |  |  | By:                                                      |  |                   
|                            |  |        | 
|                            |  |        |  |  |  |                                                         
|                            |  |        |  |  |  | Name and title, printed or typed                        



Page 2 of 2