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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a securityholder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"The 3,550 shares are being held in escrow pursuant to the Reorganization Agreement by and between the issuer and Oakwood."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein."}],"balance_after":3550,"source":{"system":"sec-edgar","filing":"0001437749-26-026579","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2040034/000143774926026579/rdgdoc.xml","form_type":"4"}},{"id":693310,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25508,"kind":"person","name":"Hall William G.","position":1,"cik":"0002040034","reported_name":"Hall William G.","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-08-07T20:06:09.000Z","date":"2026-08-05","kind":"sale","planned":false,"acquired":false,"shares":9723,"price":31.97,"value":310844.31,"ownership":{"direct":false,"nature":"By: Align Capital, LLC"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The shares of common stock were transferred from Align Opportunities, LP to Align Capital, LLC in November 2024 in a transaction exempt from Section 16 pursuant to Rule 16a-13."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $31.90 to $32.05. The price reported above reflects the weighted average sale price. 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Each option to purchase shares of issuer common stock is subject to the same terms and conditions as the corresponding option to purchase shares of Oakwood common stock immediately prior to the effective time of the Merger."}],"balance_after":767,"derivative":{"exercise_price":24.45,"expiration_date":"2032-08-17","underlying":"Common Stock","underlying_shares":767},"source":{"system":"sec-edgar","filing":"0001437749-24-031112","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2040034/000143774924031112/rdgdoc.xml","form_type":"4"}},{"id":1387680,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25508,"kind":"person","name":"Hall William G.","position":1,"cik":"0002040034","reported_name":"Hall William G.","relationship":{"director":true}}],"security":"Stock Options (Right to Buy)","published_at":"2024-10-11T20:05:54.000Z","date":"2024-10-01","kind":"grant","planned":false,"acquired":true,"shares":767,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Pursuant to the Agreement and Plan of Reorganization (the \"Reorganization Agreement\") by and between the issuer and Oakwood, each outstanding and unexercised option to purchase shares of Oakwood common stock became fully vested and was automatically converted into an option to purchase shares of issuer common stock, with the number of underlying shares and the exercise price determined as set forth in the Reorganization Agreement. Each option to purchase shares of issuer common stock is subject to the same terms and conditions as the corresponding option to purchase shares of Oakwood common stock immediately prior to the effective time of the Merger."}],"balance_after":767,"derivative":{"exercise_price":24.45,"expiration_date":"2031-01-01","underlying":"Common Stock","underlying_shares":767},"source":{"system":"sec-edgar","filing":"0001437749-24-031112","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2040034/000143774924031112/rdgdoc.xml","form_type":"4"}},{"id":1387679,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25508,"kind":"person","name":"Hall William G.","position":1,"cik":"0002040034","reported_name":"Hall William G.","relationship":{"director":true}}],"security":"Stock Options (Right to Buy)","published_at":"2024-10-11T20:05:54.000Z","date":"2024-10-01","kind":"grant","planned":false,"acquired":true,"shares":511,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Pursuant to the Agreement and Plan of Reorganization (the \"Reorganization Agreement\") by and between the issuer and Oakwood, each outstanding and unexercised option to purchase shares of Oakwood common stock became fully vested and was automatically converted into an option to purchase shares of issuer common stock, with the number of underlying shares and the exercise price determined as set forth in the Reorganization Agreement. Each option to purchase shares of issuer common stock is subject to the same terms and conditions as the corresponding option to purchase shares of Oakwood common stock immediately prior to the effective time of the Merger."}],"balance_after":511,"derivative":{"exercise_price":24.45,"expiration_date":"2029-10-16","underlying":"Common Stock","underlying_shares":511},"source":{"system":"sec-edgar","filing":"0001437749-24-031112","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2040034/000143774924031112/rdgdoc.xml","form_type":"4"}},{"id":1387678,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25508,"kind":"person","name":"Hall William G.","position":1,"cik":"0002040034","reported_name":"Hall William G.","relationship":{"director":true}}],"security":"COMMON STOCK","published_at":"2024-10-11T20:05:54.000Z","date":"2024-10-01","kind":"grant","planned":false,"acquired":true,"shares":238540,"ownership":{"direct":false,"nature":"By: Align Opportunities, LP"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Acquired in exchange for 466,628 shares of Oakwood in connection with the Merger. At the effective time of the Merger, each share of Oakwood common stock was converted into the right to receive 0.5112 shares of the issuer's common stock. On the effective date of the Merger, the closing price of the issuer's common stock was $24.59 per share. Of the 238,540 shares issued to Align Opportunities, LP in the Merger, 3,550 shares are currently being held in escrow and are subject to forfeiture during the escrow period, which shall be until the later of (i) the date that certain threatened or future litigation directly or indirectly arising out of, involving, or related to Oakwood's banking subsidiary, Oakwood Bank, and a former customer of Oakwood Bank is fully and finally resolved or (ii) two (2) years from the closing date of the Merger."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Acquired in exchange for 466,628 shares of Oakwood in connection with the Merger. At the effective time of the Merger, each share of Oakwood common stock was converted into the right to receive 0.5112 shares of the issuer's common stock. On the effective date of the Merger, the closing price of the issuer's common stock was $24.59 per share. Of the 238,540 shares issued to Align Opportunities, LP in the Merger, 3,550 shares are currently being held in escrow and are subject to forfeiture during the escrow period, which shall be until the later of (i) the date that certain threatened or future litigation directly or indirectly arising out of, involving, or related to Oakwood's banking subsidiary, Oakwood Bank, and a former customer of Oakwood Bank is fully and finally resolved or (ii) two (2) years from the closing date of the Merger."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein."}],"balance_after":238540,"source":{"system":"sec-edgar","filing":"0001437749-24-031112","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2040034/000143774924031112/rdgdoc.xml","form_type":"4"}},{"id":1387677,"issuer":{"id":4961,"kind":"organization","name":"Business First Bancshares, Inc."},"owners":[{"id":25508,"kind":"person","name":"Hall William G.","position":1,"cik":"0002040034","reported_name":"Hall William G.","relationship":{"director":true}}],"security":"COMMON STOCK","published_at":"2024-10-11T20:05:54.000Z","date":"2024-10-01","kind":"grant","planned":false,"acquired":true,"shares":4866,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Acquired in exchange for 9,520 shares of Oakwood Bancshares, Inc. (\"Oakwood\") in connection with the merger of Oakwood with and into the issuer (the \"Merger\"). At the effective time of the Merger, each share of Oakwood common stock was converted into the right to receive approximately 0.5112 shares of the issuer's common stock. On the effective date of the Merger, the closing price of the issuer's common stock was $24.59 per share. Of the 4,866 shares issued to the reporting person in the Merger, 72 shares are currently being held in escrow and are subject to forfeiture during the escrow period, which shall be until the later of (i) the date that certain threatened or future litigation directly or indirectly arising out of, involving, or related to Oakwood's banking subsidiary, Oakwood Bank, and a former customer of Oakwood Bank is fully and finally resolved or (ii) two (2) years from the closing date of the Merger."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Acquired in exchange for 9,520 shares of Oakwood Bancshares, Inc. (\"Oakwood\") in connection with the merger of Oakwood with and into the issuer (the \"Merger\"). At the effective time of the Merger, each share of Oakwood common stock was converted into the right to receive approximately 0.5112 shares of the issuer's common stock. On the effective date of the Merger, the closing price of the issuer's common stock was $24.59 per share. Of the 4,866 shares issued to the reporting person in the Merger, 72 shares are currently being held in escrow and are subject to forfeiture during the escrow period, which shall be until the later of (i) the date that certain threatened or future litigation directly or indirectly arising out of, involving, or related to Oakwood's banking subsidiary, Oakwood Bank, and a former customer of Oakwood Bank is fully and finally resolved or (ii) two (2) years from the closing date of the Merger."}],"balance_after":4866,"source":{"system":"sec-edgar","filing":"0001437749-24-031112","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2040034/000143774924031112/rdgdoc.xml","form_type":"4"}}]}