Financial Institution Business Loan Agreement dated December 17, 2020

PROMISSORY NOTE Principal Loan Date Maturity Loan No Call / Coll Account Officer Initials $4,000,000.00 12-17-2020 12-17-2021 18172001 LNS References in the boxes above are for Lender's use only and do not limit the applicability of this document to any particular loan or item. Any item above containing "***" has been omitted due to text length limitations. Borrower: ADDVANTAGE TECHNOLOGIES GROUP INC (TIN: 73-1351610); ADDVANTAGE TRITON, LLC (TIN: 81 ###-###-####); and NAVE COMMUNICATIONS COMPANY (TIN: 52 ###-###-####) 1430 BRADLEY LANE STE 196 CARROLLTON, TX 75007 Lender: Vast Bank, N.A. dba Valley National Bank Elgin 110 N Elgin Ave Tulsa, OK 74120 Principal Amount: $4,000,000.00 Date of Note: December 17, 2020 PROMISE TO PAY. ADDVANTAGE TECHNOLOGIES GROUP INC; ADDVANTAGE TRITON, LLC; and NAVE COMMUNICATIONS COMPANY ("Borrower") jointly and severally promise to pay to Vast Bank, N.A. dba Valley National Bank ("Lender"), or order, in lawful money of the United States of America, the principal amount of Four Million & 00/100 Dollars ($4,000,000.00) or so much as may be outstanding, together with interest on the unpaid outstanding principal balance of each advance. Interest shall be calculated from the date of each advance until repayment of each advance. PAYMENT. Borrower will pay this loan in one payment of all outstanding principal plus all accrued unpaid interest on December 17, 2021. In addition, Borrower will pay regular quarterly payments of all accrued unpaid interest due as of each payment date, beginning January 17, 2021, with all subsequent interest payments to be due on the same day of each quarter after that. Unless otherwise agreed or required by applicable law, payments will be applied first to any accrued unpaid interest; then to principal; then to any unpaid collection costs; and then to any late charges. Borrower will pay Lender at Lender's address shown above or at such other place as Lender may designate in writing. VARIABLE INTEREST RATE. The interest rate on this Note is subject to change from time to time based on changes in an independent index which is the Wall Street Journal Prime Rate (the "Index"). The Index is not necessarily the lowest rate charged by Lender on its loans. Lender will tell Borrower the current Index rate upon Borrower's request. The interest rate change will not occur more often than each Day. Borrower understands that Lender may make loans based on other rates as well. The Index currently is 3.250% per annum. Interest on the unpaid principal balance of this Note will be calculated as described in the "INTEREST CALCULATION METHOD" paragraph using a rate equal to the Index, adjusted if necessary for any minimum and maximum rate limitations described below, resulting in an initial rate of 4.000% per annum based on a year of 360 days. If Lender determines, in its sole discretion, that the Index has become unavailable or unreliable, either temporarily, indefinitely, or permanently, during the term of this Note, Lender may amend this Note by designating a substantially similar substitute index. Lender may also amend and add a positive or negative margin (percentage added to or subtracted from the substitute index value) as part of the rate determination. In making these amendments, Lender may take into consideration any then-prevailing market convention for selecting a substitute index and margin for the specific Index that is unavailable or unreliable. Such an amendment to the terms of this Note will become effective and bind Borrower 10 business days after Lender gives written notice to Borrower without any action or consent of the Borrower. NOTICE: Under no circumstances will the interest rate on this Note be less than 4.000% per annum or more than the maximum rate allowed by applicable law. INTEREST CALCULATION METHOD. Interest on this Note is computed on a 365/360 basis; that is, by applying the ratio of the interest rate over a year of 360 days, multiplied by the outstanding principal balance, multiplied by the actual number of days the principal balance is outstanding (but not including February 29 in leap years). All interest payable under this Note is computed using this method. PREPAYMENT. Borrower agrees that all loan fees and other prepaid finance charges are earned fully as of the date of the loan and will not be subject to refund upon early payment (whether voluntary or as a result of default), except as otherwise required by law. Except for the foregoing, Borrower may pay without penalty all or a portion of the amount owed earlier than it is due. Early payments will not, unless agreed to by Lender in writing, relieve Borrower of Borrower's obligation to continue to make payments of accrued unpaid interest. Rather, early payments will reduce the principal balance due. Borrower agrees not to send Lender payments marked "paid in full", "without recourse", or similar language. If Borrower sends such a payment, Lender may accept it without losing any of Lender's rights under this Note, and Borrower will remain obligated to pay any further amount owed to Lender. All written communications concerning disputed amounts, including any check or other payment instrument that indicates that the payment constitutes "payment in full" of the amount owed or that is tendered with other conditions or limitations or as full satisfaction of a disputed amount must be mailed or delivered to: Vast Bank, N.A. dba Valley National Bank, 13112 S. Memorial Drive Bixby, OK 74008. LATE CHARGE. If a payment is 15 days or more late, Borrower will be charged 5.000% of the unpaid portion of the regularly scheduled payment or $50.00, whichever is greater. INTEREST AFTER DEFAULT. Upon default, including failure to pay upon final maturity, the interest rate on this Note shall be increased by adding an additional 5.000 percentage point margin ("Default Rate Margin"). The Default Rate Margin shall also apply to each succeeding interest rate change that would have applied had there been no default. However, in no event will the interest rate exceed the maximum interest rate limitations under applicable law. DEFAULT. Each of the following shall constitute an event of default ("Event of Default") under this Note: Payment Default. Borrower fails to make any payment when due under this Note. Other Defaults. Borrower fails to comply with or to perform any other term, obligation, covenant or condition contained in this Note or in any of the related documents or to comply with or to perform any term, obligation, covenant or condition contained in any other agreement between Lender and Borrower. Default in Favor of Third Parties. Borrower or any Grantor defaults under any loan, extension of credit, security agreement, purchase or sales agreement, or any other agreement, in favor of any other creditor or person that may materially affect any of Borrower's property or Borrower's ability to repay this Note or perform Borrower's obligations under this Note or any of the related documents. False Statements. Any warranty, representation or statement made or furnished to Lender by Borrower or on Borrower's behalf under this Note or the related documents is false or misleading in any material respect, either now or at the time made or furnished or becomes false or misleading at any time thereafter. Insolvency. The dissolution or termination of Borrower's existence as a going business, the insolvency of Borrower, the appointment of a receiver for any part of Borrower's property, any assignment for the benefit of creditors, any type of creditor workout, or the commencement of any proceeding under any bankruptcy or insolvency laws by or against Borrower. Creditor or Forfeiture Proceedings. Commencement of foreclosure or forfeiture proceedings, whether by judicial proceeding, self-help, repossession or any other method, by any creditor of Borrower or by any governmental agency against any collateral securing the loan. This includes a garnishment of any of Borrower's accounts, including deposit accounts, with Lender. However, this Event of Default shall not apply if there is a good faith dispute by Borrower as to the validity or reasonableness of the claim which is the basis of the creditor or forfeiture proceeding and if Borrower gives Lender written notice of the creditor or forfeiture proceeding and deposits with Lender monies or a surety bond for the creditor or forfeiture proceeding, in an amount determined by Lender, in its sole discretion, as being an adequate reserve or bond for the dispute. Events Affecting Guarantor. Any of the preceding events occurs with respect to any guarantor, endorser, surety, or accommodation party of any of the indebtedness or any guarantor, endorser, surety, or accommodation party dies or becomes incompetent, or revokes or disputes the validity of, or liability under, any guaranty of the indebtedness evidenced by this Note. Change In Ownership. Any change in ownership of twenty-five percent (25%) or more of the common stock of Borrower. Adverse Change. A material adverse change occurs in Borrower's financial condition, or Lender believes the prospect of payment or performance of this Note is impaired. Insecurity. Lender in good faith believes itself insecure. Cure Provisions. If any default, other than a default in payment, is curable and if Borrower has not been given a notice of a breach of the same provision of this Note within the preceding twelve (12) months, it may be cured if Borrower, after Lender sends written notice to Borrower demanding cure of such default: (1) cures the default within ten (10) days; or (2) if the cure requires more than ten (10) days, immediately initiates steps which Lender deems in Lender's sole discretion to be sufficient to cure the default and thereafter continues and completes all reasonable and necessary steps sufficient to produce compliance as soon as reasonably practical. LENDER'S RIGHTS. Upon default, Lender may declare the entire unpaid principal balance under this Note and all accrued unpaid interest immediately due, and then Borrower will pay that amount. DocuSign Envelope ID: 1147B95E-ACF0-499D-950C-BF448435D37F

 

PROMISSORY NOTE (Continued)Loan No: 18172001 Page 2 ATTORNEYS' FEES; EXPENSES. Lender may hire or pay someone else to help collect this Note if Borrower does not pay. Borrower will pay Lender that amount. This includes, subject to any limits under applicable law, Lender's attorneys' fees and Lender's legal expenses, whether or not there is a lawsuit, including without limitation all attorneys' fees and legal expenses for bankruptcy proceedings (including efforts to modify or vacate any automatic stay or injunction), and appeals. If not prohibited by applicable law, Borrower also will pay any court costs, in addition to all other sums provided by law. JURY WAIVER. Lender and Borrower hereby waive the right to any jury trial in any action, proceeding, or counterclaim brought by either Lender or Borrower against the other. GOVERNING LAW. This Note will be governed by federal law applicable to Lender and, to the extent not preempted by federal law, the laws of the State of Oklahoma without regard to its conflicts of law provisions. This Note has been accepted by Lender in the State of Oklahoma. CHOICE OF VENUE. If there is a lawsuit, Borrower agrees upon Lender's request to submit to the jurisdiction of the courts of TULSA County, State of Oklahoma. RIGHT OF SETOFF. To the extent permitted by applicable law, Lender reserves a right of setoff in all Borrower's accounts with Lender (whether checking, savings, or some other account). This includes all accounts Borrower holds jointly with someone else and all accounts Borrower may open in the future. However, this does not include any IRA or Keogh accounts, or any trust accounts for which setoff would be prohibited by law. Borrower authorizes Lender, to the extent permitted by applicable law, to charge or setoff all sums owing on the indebtedness against any and all such accounts. COLLATERAL. Borrower acknowledges this Note is secured by a Commercial Security Agreement from Borrowers/Grantors to Lender. LINE OF CREDIT. This Note evidences a revolving line of credit. Advances under this Note may be requested either orally or in writing by Borrower or as provided in this paragraph. Lender may, but need not, require that all oral requests be confirmed in writing. All communications, instructions, or directions by telephone or otherwise to Lender are to be directed to Lender's office shown above. The following person or persons are authorized, except as provided in this paragraph, to request advances and authorize payments under the line of credit until Lender receives from Borrower, at Lender's address shown above, written notice of revocation of such authority: JOSEPH E HART, President of ADDVANTAGE TECHNOLOGIES GROUP INC; JARROD M WATSON, Chief Financial Officer of ADDVANTAGE TECHNOLOGIES GROUP INC; JOSEPH E HART, President of ADDVANTAGE TECHNOLOGIES GROUP INC, Manager of ADDVANTAGE TRITON LLC; JARROD M WATSON, Chief Financial Officer of ADDVANTAGE TECHNOLOGIES GROUP INC, Manager of ADDVANTAGE TRITON LLC; JOSEPH E HART, President of NAVE COMMUNICATIONS COMPANY; JARROD M WATSON, Chief Financial Officer of NAVE COMMUNICATIONS COMPANY. along with a monthly Borrowing Base and Loan Officer's approval. Borrower agrees to be liable for all sums either: (A) advanced in accordance with the instructions of an authorized person or (B) credited to any of Borrower's accounts with Lender. The unpaid principal balance owing on this Note at any time may be evidenced by endorsements on this Note or by Lender's internal records, including daily computer print-outs. Lender will have no obligation to advance funds under this Note if: (A) Borrower or any guarantor is in default under the terms of this Note or any agreement that Borrower or any guarantor has with Lender, including any agreement made in connection with the signing of this Note; (B) Borrower or any guarantor ceases doing business or is insolvent; (C) any guarantor seeks, claims or otherwise attempts to limit, modify or revoke such guarantor's guarantee of this Note or any other loan with Lender; (D) Borrower has applied funds provided pursuant to this Note for purposes other than those authorized by Lender; or (E) Lender in good faith believes itself insecure. COMMERCIAL LOAN LATE CHARGE. If a payment is 15 days or more late, I will be charged $50.00 or 5% of the past due amount. However, Lender may charge the maximum delinquency charge authorized by law as it may be increased during the term of this loan.. NON-USE FEE. Quarterly non-use fee of 25 basis points. PRIOR NOTE. Renewal of Loan #18172001. SUCCESSOR INTERESTS. The terms of this Note shall be binding upon Borrower, and upon Borrower's heirs, personal representatives, successors and assigns, and shall inure to the benefit of Lender and its successors and assigns. GENERAL PROVISIONS. If any part of this Note cannot be enforced, this fact will not affect the rest of the Note. Lender may delay or forgo enforcing any of its rights or remedies under this Note without losing them. Each Borrower understands and agrees that, with or without notice to Borrower, Lender may with respect to any other Borrower (a) make one or more additional secured or unsecured loans or otherwise extend additional credit; (b) alter, compromise, renew, extend, accelerate, or otherwise change one or more times the time for payment or other terms of any indebtedness, including increases and decreases of the rate of interest on the indebtedness; (c) exchange, enforce, waive, subordinate, fail or decide not to perfect, and release any security, with or without the substitution of new collateral; (d) apply such security and direct the order or manner of sale thereof, including without limitation, any non-judicial sale permitted by the terms of the controlling security agreements, as Lender in its discretion may determine; (e) release, substitute, agree not to sue, or deal with any one or more of Borrower's sureties, endorsers, or other guarantors on any terms or in any manner Lender may choose; and (f) determine how, when and what application of payments and credits shall be made on any other indebtedness owing by such other Borrower. Borrower and any other person who signs, guarantees or endorses this Note, to the extent allowed by law, waive presentment, demand for payment, and notice of dishonor. Upon any change in the terms of this Note, and unless otherwise expressly stated in writing, no party who signs this Note, whether as maker, guarantor, accommodation maker or endorser, shall be released from liability. All such parties agree that Lender may renew or extend (repeatedly and for any length of time) this loan or release any party or guarantor or collateral; or impair, fail to realize upon or perfect Lender's security interest in the collateral; and take any other action deemed necessary by Lender without the consent of or notice to anyone. All such parties also agree that Lender may modify this loan without the consent of or notice to anyone other than the party with whom the modification is made. The obligations under this Note are joint and several. PRIOR TO SIGNING THIS NOTE, EACH BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS OF THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. EACH BORROWER AGREES TO THE TERMS OF THE NOTE. BORROWER ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS PROMISSORY NOTE. BORROWER: ADDVANTAGE TECHNOLOGIES GROUP INC By: JOSEPH E HART, President of ADDVANTAGE TECHNOLOGIES GROUP INC ADDVANTAGE TRITON, LLC ADDVANTAGE TECHNOLOGIES GROUP INC, Manager of ADDVANTAGE TRITON, LLC By: JOSEPH E HART, President of ADDVANTAGE TECHNOLOGIES GROUP INC NAVE COMMUNICATIONS COMPANY By: JOSEPH E HART, President of NAVE COMMUNICATIONS COMPANY DocuSign Envelope ID: 1147B95E-ACF0-499D-950C-BF448435D37F